Move Point to Offset (#9277)

* Manually fix every use of Point.x and Point.y

Some of these were moved to dx/dy, but not all.

* Manually convert uses of the old gradient API

* Remove old reference to Point.

* Mechanical changes

I applied the following at the root of the Flutter repository:

git ls-files -z | xargs -0 sed -i 's/\bPoint[.]origin\b/Offset.zero/g'
git ls-files -z | xargs -0 sed -i 's/\bPoint[.]lerp\b/Offset.lerp/g'
git ls-files -z | xargs -0 sed -i 's/\bnew Point\b/new Offset/g'
git ls-files -z | xargs -0 sed -i 's/\bconst Point\b/const Offset/g'
git ls-files -z | xargs -0 sed -i 's/\bstatic Point /static Offset /g'
git ls-files -z | xargs -0 sed -i 's/\bfinal Point /final Offset /g'
git ls-files -z | xargs -0 sed -i 's/^\( *\)Point /\1Offset /g'
git ls-files -z | xargs -0 sed -i 's/ui[.]Point\b/ui.Offset/g'
git ls-files -z | xargs -0 sed -i 's/(Point\b/(Offset/g'
git ls-files -z | xargs -0 sed -i 's/\([[{,]\) Point\b/\1 Offset/g'
git ls-files -z | xargs -0 sed -i 's/@required Point\b/@required Offset/g'
git ls-files -z | xargs -0 sed -i 's/<Point>/<Offset>/g'
git ls-files -z | xargs -0 sed -i 's/[.]toOffset()//g'
git ls-files -z | xargs -0 sed -i 's/[.]toPoint()//g'
git ls-files -z | xargs -0 sed -i 's/\bshow Point, /show /g'
git ls-files -z | xargs -0 sed -i 's/\bshow Point;/show Offset;/g'

* Mechanical changes - dartdocs

I applied the following at the root of the Flutter repository:

git ls-files -z | xargs -0 sed -i 's/\ba \[Point\]/an [Offset]/g'
git ls-files -z | xargs -0 sed -i 's/\[Point\]/[Offset]/g'

* Further improvements and a test

* Fix minor errors from rebasing...

* Roll engine

bin/internal/engine.version

@@ -1 +1 @@
-059ab3a47165d98cb1d7ac5e2a2e4b50abf39832
+bcc8779cb88c0474f94277efa0ab7c83f14a0a9b

dev/benchmarks/microbenchmarks/lib/stocks/animation_bench.dart

@@ -53,12 +53,12 @@ Future<Null> main() async {
     while (wallClockWatch.elapsed < kBenchmarkTime) {
       cpuWatch.reset();
       if (drawerIsOpen) {
-        await tester.tapAt(const Point(780.0, 250.0)); // Close drawer
+        await tester.tapAt(const Offset(780.0, 250.0)); // Close drawer
         await tester.pump();
         totalCloseIterationCount += 1;
         totalCloseFrameElapsedMicroseconds += cpuWatch.elapsedMicroseconds;
       } else {
-        await tester.tapAt(const Point(20.0, 50.0)); // Open drawer
+        await tester.tapAt(const Offset(20.0, 50.0)); // Open drawer
         await tester.pump();
         totalOpenIterationCount += 1;
         totalOpenFrameElapsedMicroseconds += cpuWatch.elapsedMicroseconds;

dev/benchmarks/microbenchmarks/lib/stocks/build_bench.dart

@@ -31,7 +31,7 @@ Future<Null> main() async {
     stocks.main();
     await tester.pump(); // Start startup animation
     await tester.pump(const Duration(seconds: 1)); // Complete startup animation
-    await tester.tapAt(const Point(20.0, 40.0)); // Open drawer
+    await tester.tapAt(const Offset(20.0, 40.0)); // Open drawer
     await tester.pump(); // Start drawer animation
     await tester.pump(const Duration(seconds: 1)); // Complete drawer animation
 

dev/benchmarks/microbenchmarks/lib/stocks/layout_bench.dart

@@ -30,7 +30,7 @@ Future<Null> main() async {
     stocks.main();
     await tester.pump(); // Start startup animation
     await tester.pump(const Duration(seconds: 1)); // Complete startup animation
-    await tester.tapAt(const Point(20.0, 40.0)); // Open drawer
+    await tester.tapAt(const Offset(20.0, 40.0)); // Open drawer
     await tester.pump(); // Start drawer animation
     await tester.pump(const Duration(seconds: 1)); // Complete drawer animation
 

dev/manual_tests/drag_and_drop.dart

@@ -163,7 +163,7 @@ class DashOutlineCirclePainter extends CustomPainter {
       ..style = PaintingStyle.stroke
       ..strokeWidth = radius / 10.0;
     final Path path = new Path();
-    final Rect box = Point.origin & size;
+    final Rect box = Offset.zero & size;
     for (double theta = 0.0; theta < math.PI * 2.0; theta += deltaTheta)
       path.addArc(box, theta + startOffset, segmentArc);
     canvas.drawPath(path, paint);

dev/manual_tests/material_arc.dart

@@ -54,7 +54,7 @@ class _PointDemoPainter extends CustomPainter {
   final MaterialPointArcTween arc;
   Animation<double> _repaint;
 
-  void drawPoint(Canvas canvas, Point point, Color color) {
+  void drawPoint(Canvas canvas, Offset point, Color color) {
     final Paint paint = new Paint()
       ..color = color.withOpacity(0.25)
       ..style = PaintingStyle.fill;
@@ -93,7 +93,7 @@ class _PointDemoPainter extends CustomPainter {
   }
 
   @override
-  bool hitTest(Point position) {
+  bool hitTest(Offset position) {
     return (arc.begin - position).distanceSquared < _kTargetSlop
         || (arc.end - position).distanceSquared < _kTargetSlop;
   }
@@ -117,8 +117,8 @@ class _PointDemoState extends State<_PointDemo> {
   CurvedAnimation _animation;
   _DragTarget _dragTarget;
   Size _screenSize;
-  Point _begin;
+  Offset _begin;
-  Point _end;
+  Offset _end;
 
   @override
   void initState() {
@@ -132,7 +132,7 @@ class _PointDemoState extends State<_PointDemo> {
     super.dispose();
   }
 
-  Drag _handleOnStart(Point position) {
+  Drag _handleOnStart(Offset position) {
     // TODO(hansmuller): allow the user to drag both points at the same time.
     if (_dragTarget != null)
       return new _IgnoreDrag();
@@ -181,8 +181,8 @@ class _PointDemoState extends State<_PointDemo> {
     final Size screenSize = MediaQuery.of(context).size;
     if (_screenSize == null || _screenSize != screenSize) {
       _screenSize = screenSize;
-      _begin = new Point(screenSize.width * 0.5, screenSize.height * 0.2);
+      _begin = new Offset(screenSize.width * 0.5, screenSize.height * 0.2);
-      _end = new Point(screenSize.width * 0.1, screenSize.height * 0.4);
+      _end = new Offset(screenSize.width * 0.1, screenSize.height * 0.4);
     }
 
     final MaterialPointArcTween arc = new MaterialPointArcTween(begin: _begin, end: _end);
@@ -229,7 +229,7 @@ class _RectangleDemoPainter extends CustomPainter {
   final MaterialRectArcTween arc;
   Animation<double> _repaint;
 
-  void drawPoint(Canvas canvas, Point p, Color color) {
+  void drawPoint(Canvas canvas, Offset p, Color color) {
     final Paint paint = new Paint()
       ..color = color.withOpacity(0.25)
       ..style = PaintingStyle.fill;
@@ -258,7 +258,7 @@ class _RectangleDemoPainter extends CustomPainter {
   }
 
   @override
-  bool hitTest(Point position) {
+  bool hitTest(Offset position) {
     return (arc.begin.center - position).distanceSquared < _kTargetSlop
         || (arc.end.center - position).distanceSquared < _kTargetSlop;
   }
@@ -297,7 +297,7 @@ class _RectangleDemoState extends State<_RectangleDemo> {
     super.dispose();
   }
 
-  Drag _handleOnStart(Point position) {
+  Drag _handleOnStart(Offset position) {
     // TODO(hansmuller): allow the user to drag both points at the same time.
     if (_dragTarget != null)
       return new _IgnoreDrag();

dev/manual_tests/overlay_geometry.dart

@@ -33,19 +33,19 @@ class _MarkerPainter extends CustomPainter {
   void paint(Canvas canvas, _) {
     final Paint paint = new Paint()..color = const Color(0x8000FF00);
     final double r = size / 2.0;
-    canvas.drawCircle(new Point(r, r), r, paint);
+    canvas.drawCircle(new Offset(r, r), r, paint);
 
     paint
       ..color = const Color(0xFFFFFFFF)
       ..style = PaintingStyle.stroke
       ..strokeWidth = 1.0;
     if (type == MarkerType.topLeft) {
-      canvas.drawLine(new Point(r, r), new Point(r + r - 1.0, r), paint);
+      canvas.drawLine(new Offset(r, r), new Offset(r + r - 1.0, r), paint);
-      canvas.drawLine(new Point(r, r), new Point(r, r + r - 1.0), paint);
+      canvas.drawLine(new Offset(r, r), new Offset(r, r + r - 1.0), paint);
     }
     if (type == MarkerType.bottomRight) {
-      canvas.drawLine(new Point(r, r), new Point(1.0, r), paint);
+      canvas.drawLine(new Offset(r, r), new Offset(1.0, r), paint);
-      canvas.drawLine(new Point(r, r), new Point(r, 1.0), paint);
+      canvas.drawLine(new Offset(r, r), new Offset(r, 1.0), paint);
     }
   }
 
@@ -64,15 +64,15 @@ class Marker extends StatelessWidget {
     this.size: 40.0,
   }) : super(key: key);
 
-  final Point position;
+  final Offset position;
   final double size;
   final MarkerType type;
 
   @override
   Widget build(BuildContext context) {
     return new Positioned(
-      left: position.x - size / 2.0,
+      left: position.dx - size / 2.0,
-      top: position.y - size / 2.0,
+      top: position.dy - size / 2.0,
       width: size,
       height: size,
       child: new IgnorePointer(
@@ -92,7 +92,7 @@ class OverlayGeometryApp extends StatefulWidget {
   OverlayGeometryAppState createState() => new OverlayGeometryAppState();
 }
 
-typedef void CardTapCallback(GlobalKey targetKey, Point globalPosition);
+typedef void CardTapCallback(GlobalKey targetKey, Offset globalPosition);
 
 class CardBuilder extends SliverChildDelegate {
   CardBuilder({ this.cardModels, this.onTapUp });
@@ -134,7 +134,7 @@ class CardBuilder extends SliverChildDelegate {
 
 class OverlayGeometryAppState extends State<OverlayGeometryApp> {
   List<CardModel> cardModels;
-  Map<MarkerType, Point> markers = <MarkerType, Point>{};
+  Map<MarkerType, Offset> markers = <MarkerType, Offset>{};
   double markersScrollOffset = 0.0;
 
   @override
@@ -157,21 +157,21 @@ class OverlayGeometryAppState extends State<OverlayGeometryApp> {
         final double dy = markersScrollOffset - notification.metrics.extentBefore;
         markersScrollOffset = notification.metrics.extentBefore;
         for (MarkerType type in markers.keys) {
-          final Point oldPosition = markers[type];
+          final Offset oldPosition = markers[type];
-          markers[type] = new Point(oldPosition.x, oldPosition.y + dy);
+          markers[type] = oldPosition.translate(0.0, dy);
         }
       });
     }
     return false;
   }
 
-  void handleTapUp(GlobalKey target, Point globalPosition) {
+  void handleTapUp(GlobalKey target, Offset globalPosition) {
     setState(() {
       markers[MarkerType.touch] = globalPosition;
       final RenderBox box = target.currentContext.findRenderObject();
-      markers[MarkerType.topLeft] = box.localToGlobal(const Point(0.0, 0.0));
+      markers[MarkerType.topLeft] = box.localToGlobal(const Offset(0.0, 0.0));
       final Size size = box.size;
-      markers[MarkerType.bottomRight] = box.localToGlobal(new Point(size.width, size.height));
+      markers[MarkerType.bottomRight] = box.localToGlobal(new Offset(size.width, size.height));
       final ScrollableState scrollable = Scrollable.of(target.currentContext);
       markersScrollOffset = scrollable.position.pixels;
     });

examples/flutter_gallery/lib/demo/animation/home.dart

@@ -178,8 +178,8 @@ class _AllSectionsLayout extends MultiChildLayoutDelegate {
     return Rect.lerp(begin, end, tColumnToRow);
   }
 
-  Point _interpolatePoint(Point begin, Point end) {
+  Offset _interpolatePoint(Offset begin, Offset end) {
-    return Point.lerp(begin, end, tColumnToRow);
+    return Offset.lerp(begin, end, tColumnToRow);
   }
 
   @override
@@ -220,30 +220,30 @@ class _AllSectionsLayout extends MultiChildLayoutDelegate {
           cardRect.left + 0.5, cardRect.top, cardRect.width - 1.0, cardRect.height
         );
         layoutChild(cardId, new BoxConstraints.tight(insetRect.size));
-        positionChild(cardId, insetRect.topLeft.toOffset());
+        positionChild(cardId, insetRect.topLeft);
       }
 
       // Layout the title for index.
       final Size titleSize = layoutChild('title$index', new BoxConstraints.loose(cardRect.size));
-      final double columnTitleY = columnCardRect.centerLeft.y - titleSize.height / 2.0;
+      final double columnTitleY = columnCardRect.centerLeft.dy - titleSize.height / 2.0;
-      final double rowTitleY = rowCardRect.centerLeft.y - titleSize.height / 2.0;
+      final double rowTitleY = rowCardRect.centerLeft.dy - titleSize.height / 2.0;
       final double centeredRowTitleX = rowTitleX + (rowTitleWidth - titleSize.width) / 2.0;
-      final Point columnTitleOrigin = new Point(columnTitleX, columnTitleY);
+      final Offset columnTitleOrigin = new Offset(columnTitleX, columnTitleY);
-      final Point rowTitleOrigin = new Point(centeredRowTitleX, rowTitleY);
+      final Offset rowTitleOrigin = new Offset(centeredRowTitleX, rowTitleY);
-      final Point titleOrigin = _interpolatePoint(columnTitleOrigin, rowTitleOrigin);
+      final Offset titleOrigin = _interpolatePoint(columnTitleOrigin, rowTitleOrigin);
-      positionChild('title$index', titleOrigin.toOffset() + offset);
+      positionChild('title$index', titleOrigin + offset);
 
       // Layout the selection indicator for index.
       final Size indicatorSize = layoutChild('indicator$index', new BoxConstraints.loose(cardRect.size));
-      final double columnIndicatorX = cardRect.centerRight.x - indicatorSize.width - 16.0;
+      final double columnIndicatorX = cardRect.centerRight.dx - indicatorSize.width - 16.0;
-      final double columnIndicatorY = cardRect.bottomRight.y - indicatorSize.height - 16.0;
+      final double columnIndicatorY = cardRect.bottomRight.dy - indicatorSize.height - 16.0;
-      final Point columnIndicatorOrigin = new Point(columnIndicatorX, columnIndicatorY);
+      final Offset columnIndicatorOrigin = new Offset(columnIndicatorX, columnIndicatorY);
       final Rect titleRect = new Rect.fromPoints(titleOrigin, titleSize.bottomRight(titleOrigin));
       final double centeredRowIndicatorX = rowIndicatorX + (rowIndicatorWidth - indicatorSize.width) / 2.0;
-      final double rowIndicatorY = titleRect.bottomCenter.y + 16.0;
+      final double rowIndicatorY = titleRect.bottomCenter.dy + 16.0;
-      final Point rowIndicatorOrigin = new Point(centeredRowIndicatorX, rowIndicatorY);
+      final Offset rowIndicatorOrigin = new Offset(centeredRowIndicatorX, rowIndicatorY);
-      final Point indicatorOrigin = _interpolatePoint(columnIndicatorOrigin, rowIndicatorOrigin);
+      final Offset indicatorOrigin = _interpolatePoint(columnIndicatorOrigin, rowIndicatorOrigin);
-      positionChild('indicator$index', indicatorOrigin.toOffset() + offset);
+      positionChild('indicator$index', indicatorOrigin + offset);
 
       columnCardY += columnCardHeight;
       rowCardX += rowCardWidth;
@@ -434,7 +434,7 @@ class _AnimationDemoHomeState extends State<AnimationDemoHome> {
           behavior: HitTestBehavior.opaque,
           child: new SectionCard(section: allSections[index]),
           onTapUp: (TapUpDetails details) {
-            final double xOffset = details.globalPosition.x;
+            final double xOffset = details.globalPosition.dx;
             setState(() {
               _maybeScroll(midScrollOffset, index, xOffset);
             });

examples/flutter_gallery/lib/demo/material/grid_list_demo.dart

@@ -90,7 +90,7 @@ class _GridPhotoViewerState extends State<GridPhotoViewer> with SingleTickerProv
   void _handleOnScaleStart(ScaleStartDetails details) {
     setState(() {
       _previousScale = _scale;
-      _normalizedOffset = (details.focalPoint.toOffset() - _offset) / _scale;
+      _normalizedOffset = (details.focalPoint - _offset) / _scale;
       // The fling animation stops if an input gesture starts.
       _controller.stop();
     });
@@ -100,7 +100,7 @@ class _GridPhotoViewerState extends State<GridPhotoViewer> with SingleTickerProv
     setState(() {
       _scale = (_previousScale * details.scale).clamp(1.0, 4.0);
       // Ensure that image location under the focal point stays in the same place despite scaling.
-      _offset = _clampOffset(details.focalPoint.toOffset() - _normalizedOffset * _scale);
+      _offset = _clampOffset(details.focalPoint - _normalizedOffset * _scale);
     });
   }
 
@@ -109,7 +109,7 @@ class _GridPhotoViewerState extends State<GridPhotoViewer> with SingleTickerProv
     if (magnitude < _kMinFlingVelocity)
       return;
     final Offset direction = details.velocity.pixelsPerSecond / magnitude;
-    final double distance = (Point.origin & context.size).shortestSide;
+    final double distance = (Offset.zero & context.size).shortestSide;
     _flingAnimation = new Tween<Offset>(
       begin: _offset,
       end: _clampOffset(_offset + direction * distance)

examples/flutter_gallery/test/example_code_display_test.dart

@@ -20,7 +20,7 @@ void main() {
 
 
     // Scroll the Buttons demo into view so that a tap will succeed
-    final Point allDemosOrigin = tester.getTopRight(find.text('Demos'));
+    final Offset allDemosOrigin = tester.getTopRight(find.text('Demos'));
     final Finder button = find.text('Buttons');
     while (button.evaluate().isEmpty) {
       await tester.dragFrom(allDemosOrigin, const Offset(0.0, -100.0));

examples/flutter_gallery/test/smoke_test.dart

@@ -77,8 +77,8 @@ Future<Null> smokeDemo(WidgetTester tester, String routeName) async {
   await tester.pump(const Duration(milliseconds: 400));
 
   // Scroll the demo around a bit.
-  await tester.flingFrom(const Point(400.0, 300.0), const Offset(-100.0, 0.0), 500.0);
+  await tester.flingFrom(const Offset(400.0, 300.0), const Offset(-100.0, 0.0), 500.0);
-  await tester.flingFrom(const Point(400.0, 300.0), const Offset(0.0, -100.0), 500.0);
+  await tester.flingFrom(const Offset(400.0, 300.0), const Offset(0.0, -100.0), 500.0);
   await tester.pump();
   await tester.pump(const Duration(milliseconds: 50));
   await tester.pump(const Duration(milliseconds: 200));
@@ -90,15 +90,15 @@ Future<Null> smokeDemo(WidgetTester tester, String routeName) async {
   verifyToStringOutput('debugDumpLayerTree', routeName, RendererBinding.instance?.renderView?.debugLayer?.toStringDeep());
 
   // Scroll the demo around a bit more.
-  await tester.flingFrom(const Point(400.0, 300.0), const Offset(-200.0, 0.0), 500.0);
+  await tester.flingFrom(const Offset(400.0, 300.0), const Offset(-200.0, 0.0), 500.0);
   await tester.pump();
   await tester.pump(const Duration(milliseconds: 50));
   await tester.pump(const Duration(milliseconds: 200));
   await tester.pump(const Duration(milliseconds: 400));
-  await tester.flingFrom(const Point(400.0, 300.0), const Offset(100.0, 0.0), 500.0);
+  await tester.flingFrom(const Offset(400.0, 300.0), const Offset(100.0, 0.0), 500.0);
   await tester.pump();
   await tester.pump(const Duration(milliseconds: 400));
-  await tester.flingFrom(const Point(400.0, 300.0), const Offset(0.0, 400.0), 1000.0);
+  await tester.flingFrom(const Offset(400.0, 300.0), const Offset(0.0, 400.0), 1000.0);
   await tester.pump();
   await tester.pump(const Duration(milliseconds: 400));
 

examples/layers/raw/canvas.dart

@@ -26,24 +26,24 @@ ui.Picture paint(ui.Rect paintBounds) {
   canvas.drawPaint(new ui.Paint()..color = const ui.Color(0xFFFFFFFF));
 
   final ui.Size size = paintBounds.size;
-  final ui.Point mid = size.center(ui.Point.origin);
+  final ui.Offset mid = size.center(ui.Offset.zero);
   final double radius = size.shortestSide / 2.0;
 
   final double devicePixelRatio = ui.window.devicePixelRatio;
   final ui.Size logicalSize = ui.window.physicalSize / devicePixelRatio;
 
   canvas.save();
-  canvas.translate(-mid.x/2.0, logicalSize.height*2.0);
+  canvas.translate(-mid.dx / 2.0, logicalSize.height * 2.0);
-  canvas.clipRect(
+  canvas.clipRect(new ui.Rect.fromLTRB(0.0, -logicalSize.height, logicalSize.width, radius));
-      new ui.Rect.fromLTRB(0.0, -logicalSize.height, logicalSize.width, radius));
 
-  canvas.translate(mid.x, mid.y);
+  canvas.translate(mid.dx, mid.dy);
   paint.color = const ui.Color.fromARGB(128, 255, 0, 255);
   canvas.rotate(math.PI/4.0);
 
   final ui.Gradient yellowBlue = new ui.Gradient.linear(
-    <ui.Point>[new ui.Point(-radius, -radius), const ui.Point(0.0, 0.0)],
+    new ui.Offset(-radius, -radius),
-    <ui.Color>[const ui.Color(0xFFFFFF00), const ui.Color(0xFF0000FF)]
+    const ui.Offset(0.0, 0.0),
+    <ui.Color>[const ui.Color(0xFFFFFF00), const ui.Color(0xFF0000FF)],
   );
   canvas.drawRect(new ui.Rect.fromLTRB(-radius, -radius, radius, radius),
                   new ui.Paint()..shader = yellowBlue);
@@ -57,11 +57,11 @@ ui.Picture paint(ui.Rect paintBounds) {
   ]);
   canvas.transform(scaleMatrix);
   paint.color = const ui.Color.fromARGB(128, 0, 255, 0);
-  canvas.drawCircle(ui.Point.origin, radius, paint);
+  canvas.drawCircle(ui.Offset.zero, radius, paint);
   canvas.restore();
 
   paint.color = const ui.Color.fromARGB(128, 255, 0, 0);
-  canvas.drawCircle(const ui.Point(150.0, 300.0), radius, paint);
+  canvas.drawCircle(const ui.Offset(150.0, 300.0), radius, paint);
 
   // When we're done issuing painting commands, we end the recording an receive
   // a Picture, which is an immutable record of the commands we've issued. You
@@ -85,7 +85,7 @@ ui.Scene composite(ui.Picture picture, ui.Rect paintBounds) {
 }
 
 void beginFrame(Duration timeStamp) {
-  final ui.Rect paintBounds = ui.Point.origin & (ui.window.physicalSize / ui.window.devicePixelRatio);
+  final ui.Rect paintBounds = ui.Offset.zero & (ui.window.physicalSize / ui.window.devicePixelRatio);
   final ui.Picture picture = paint(paintBounds);
   final ui.Scene scene = composite(picture, paintBounds);
   ui.window.render(scene);

examples/layers/raw/hello_world.dart

@@ -16,7 +16,7 @@ void beginFrame(Duration timeStamp) {
   final ui.Paragraph paragraph = paragraphBuilder.build()
     ..layout(new ui.ParagraphConstraints(width: logicalSize.width));
 
-  final ui.Rect physicalBounds = ui.Point.origin & (logicalSize * devicePixelRatio);
+  final ui.Rect physicalBounds = ui.Offset.zero & (logicalSize * devicePixelRatio);
   final ui.PictureRecorder recorder = new ui.PictureRecorder();
   final ui.Canvas canvas = new ui.Canvas(recorder, physicalBounds);
   canvas.scale(devicePixelRatio, devicePixelRatio);

examples/layers/raw/spinning_square.dart

@@ -19,7 +19,7 @@ void beginFrame(Duration timeStamp) {
 
   // PAINT
 
-  final ui.Rect paintBounds = ui.Point.origin & (ui.window.physicalSize / ui.window.devicePixelRatio);
+  final ui.Rect paintBounds = ui.Offset.zero & (ui.window.physicalSize / ui.window.devicePixelRatio);
   final ui.PictureRecorder recorder = new ui.PictureRecorder();
   final ui.Canvas canvas = new ui.Canvas(recorder, paintBounds);
   canvas.translate(paintBounds.width / 2.0, paintBounds.height / 2.0);

examples/layers/raw/text.dart

@@ -44,7 +44,7 @@ ui.Scene composite(ui.Picture picture, ui.Rect paintBounds) {
 }
 
 void beginFrame(Duration timeStamp) {
-  final ui.Rect paintBounds = ui.Point.origin & (ui.window.physicalSize / ui.window.devicePixelRatio);
+  final ui.Rect paintBounds = ui.Offset.zero & (ui.window.physicalSize / ui.window.devicePixelRatio);
   final ui.Picture picture = paint(paintBounds);
   final ui.Scene scene = composite(picture, paintBounds);
   ui.window.render(scene);

examples/layers/raw/touch_input.dart

@@ -26,7 +26,7 @@ ui.Picture paint(ui.Rect paintBounds) {
   // The commands draw a circle in the center of the screen.
   final ui.Size size = paintBounds.size;
   canvas.drawCircle(
-    size.center(ui.Point.origin),
+    size.center(ui.Offset.zero),
     size.shortestSide * 0.45,
     new ui.Paint()..color = color
   );
@@ -67,7 +67,7 @@ ui.Scene composite(ui.Picture picture, ui.Rect paintBounds) {
 }
 
 void beginFrame(Duration timeStamp) {
-  final ui.Rect paintBounds = ui.Point.origin & (ui.window.physicalSize / ui.window.devicePixelRatio);
+  final ui.Rect paintBounds = ui.Offset.zero & (ui.window.physicalSize / ui.window.devicePixelRatio);
   // First, record a picture with our painting commands.
   final ui.Picture picture = paint(paintBounds);
   // Second, include that picture in a scene graph.

examples/layers/rendering/src/sector_layout.dart

@@ -525,22 +525,22 @@ class RenderBoxToRenderSectorAdapter extends RenderBox with RenderObjectWithChil
     if (child != null) {
       final Rect bounds = offset & size;
       // we move the offset to the center of the circle for the RenderSectors
-      context.paintChild(child, bounds.center.toOffset());
+      context.paintChild(child, bounds.center);
     }
   }
 
   @override
-  bool hitTest(HitTestResult result, { Point position }) {
+  bool hitTest(HitTestResult result, { Offset position }) {
     if (child == null)
       return false;
-    double x = position.x;
+    double x = position.dx;
-    double y = position.y;
+    double y = position.dy;
     // translate to our origin
-    x -= size.width/2.0;
+    x -= size.width / 2.0;
-    y -= size.height/2.0;
+    y -= size.height / 2.0;
     // convert to radius/theta
-    final double radius = math.sqrt(x*x+y*y);
+    final double radius = math.sqrt(x * x + y * y);
-    final double theta = (math.atan2(x, -y) - math.PI/2.0) % kTwoPi;
+    final double theta = (math.atan2(x, -y) - math.PI / 2.0) % kTwoPi;
     if (radius < innerRadius)
       return false;
     if (radius >= innerRadius + child.deltaRadius)

examples/layers/rendering/touch_input.dart

@@ -23,7 +23,7 @@ class Dot {
   Dot({ Color color }) : _paint = new Paint()..color = color;
 
   final Paint _paint;
-  Point position = Point.origin;
+  Offset position = Offset.zero;
   double radius = 0.0;
 
   void update(PointerEvent event) {
@@ -58,7 +58,7 @@ class RenderDots extends RenderBox {
 
   /// Makes this render object hittable so that it receives pointer events.
   @override
-  bool hitTestSelf(Point position) => true;
+  bool hitTestSelf(Offset position) => true;
 
   /// Processes pointer events by mutating state and invalidating its previous
   /// painting commands.

examples/layers/widgets/custom_render_box.dart

@@ -10,9 +10,9 @@ class RenderDots extends RenderConstrainedBox {
 
   // Makes this render box hittable so that we'll get pointer events.
   @override
-  bool hitTestSelf(Point position) => true;
+  bool hitTestSelf(Offset position) => true;
 
-  final Map<int, Point> _dots = <int, Point>{};
+  final Map<int, Offset> _dots = <int, Offset>{};
 
   @override
   void handleEvent(PointerEvent event, BoxHitTestEntry entry) {
@@ -31,7 +31,7 @@ class RenderDots extends RenderConstrainedBox {
     canvas.drawRect(offset & size, new Paint()..color = const Color(0xFF0000FF));
 
     final Paint paint = new Paint()..color = const Color(0xFF00FF00);
-    for (Point point in _dots.values)
+    for (Offset point in _dots.values)
       canvas.drawCircle(point, 50.0, paint);
 
     super.paint(context, offset);

examples/layers/widgets/gestures.dart

@@ -27,18 +27,16 @@ class _GesturePainter extends CustomPainter {
 
   @override
   void paint(Canvas canvas, Size size) {
-    final Point center = (size.center(Point.origin).toOffset() * zoom + offset).toPoint();
+    final Offset center = (size.center(Offset.zero) * zoom + offset);
     final double radius = size.width / 2.0 * zoom;
     final Gradient gradient = new RadialGradient(
       colors: forward ? <Color>[swatch.shade50, swatch.shade900]
                       : <Color>[swatch.shade900, swatch.shade50]
     );
     final Paint paint = new Paint()
-      ..shader = gradient.createShader(new Rect.fromLTWH(
+      ..shader = gradient.createShader(new Rect.fromCircle(
-        center.x - radius,
+        center: center,
-        center.y - radius,
+        radius: radius,
-        radius * 2.0,
-        radius * 2.0
       ));
     canvas.drawCircle(center, radius, paint);
   }
@@ -63,7 +61,7 @@ class GestureDemo extends StatefulWidget {
 
 class _GestureDemoState extends State<GestureDemo> {
 
-  Point _startingFocalPoint;
+  Offset _startingFocalPoint;
 
   Offset _previousOffset;
   Offset _offset = Offset.zero;
@@ -92,8 +90,8 @@ class _GestureDemoState extends State<GestureDemo> {
       _zoom = (_previousZoom * details.scale);
 
       // Ensure that item under the focal point stays in the same place despite zooming
-      final Offset normalizedOffset = (_startingFocalPoint.toOffset() - _previousOffset) / _previousZoom;
+      final Offset normalizedOffset = (_startingFocalPoint - _previousOffset) / _previousZoom;
-      _offset = details.focalPoint.toOffset() - normalizedOffset * _zoom;
+      _offset = details.focalPoint - normalizedOffset * _zoom;
     });
   }
 

examples/stocks/lib/stock_arrow.dart

@@ -42,7 +42,7 @@ class StockArrowPainter extends CustomPainter {
 
     // Draw a circle that circumscribes the arrow.
     paint.style = PaintingStyle.stroke;
-    canvas.drawCircle(new Point(centerX, centerY), r, paint);
+    canvas.drawCircle(new Offset(centerX, centerY), r, paint);
   }
 
   @override

examples/stocks/test/icon_color_test.dart

@@ -61,8 +61,8 @@ void main() {
     expect(find.text('Account Balance'), findsNothing);
 
     // drag the drawer out
-    final Point left = new Point(0.0, ui.window.physicalSize.height / 2.0);
+    final Offset left = new Offset(0.0, ui.window.physicalSize.height / 2.0);
-    final Point right = new Point(ui.window.physicalSize.width, left.y);
+    final Offset right = new Offset(ui.window.physicalSize.width, left.dy);
     final TestGesture gesture = await tester.startGesture(left);
     await tester.pump();
     await gesture.moveTo(right);

packages/flutter/lib/src/cupertino/dialog.dart

@@ -272,12 +272,12 @@ class _CupertinoButtonBarPainter extends CustomPainter {
     final Paint paint = new Paint()
       ..color = _kButtonDividerColor;
 
-    canvas.drawLine(Point.origin, new Point(size.width, 0.0), paint);
+    canvas.drawLine(Offset.zero, new Offset(size.width, 0.0), paint);
     for (int i = 1; i < count; ++i) {
       // TODO(abarth): Hide the divider when one of the adjacent buttons is
       // highlighted.
       final double x = size.width * i / count;
-      canvas.drawLine(new Point(x, 0.0), new Point(x, size.height), paint);
+      canvas.drawLine(new Offset(x, 0.0), new Offset(x, size.height), paint);
     }
   }
 

packages/flutter/lib/src/cupertino/slider.dart

@@ -281,8 +281,8 @@ class _RenderCupertinoSlider extends RenderConstrainedBox implements SemanticsAc
   }
 
   @override
-  bool hitTestSelf(Point position) {
+  bool hitTestSelf(Offset position) {
-    return (position.x - _thumbCenter).abs() < CupertinoThumbPainter.radius + _kPadding;
+    return (position.dx - _thumbCenter).abs() < CupertinoThumbPainter.radius + _kPadding;
   }
 
   @override
@@ -319,7 +319,7 @@ class _RenderCupertinoSlider extends RenderConstrainedBox implements SemanticsAc
       canvas.drawRRect(new RRect.fromLTRBXY(trackActive, trackTop, trackRight, trackBottom, 1.0, 1.0), paint);
     }
 
-    final Point thumbCenter = new Point(trackActive, trackCenter);
+    final Offset thumbCenter = new Offset(trackActive, trackCenter);
     _thumbPainter.paint(canvas, new Rect.fromCircle(center: thumbCenter, radius: CupertinoThumbPainter.radius));
   }
 

packages/flutter/lib/src/cupertino/switch.dart

@@ -321,7 +321,7 @@ class _RenderCupertinoSwitch extends RenderConstrainedBox implements SemanticsAc
   }
 
   @override
-  bool hitTestSelf(Point position) => true;
+  bool hitTestSelf(Offset position) => true;
 
   @override
   void handleEvent(PointerEvent event, BoxHitTestEntry entry) {

packages/flutter/lib/src/gestures/binding.dart

@@ -83,7 +83,7 @@ abstract class GestureBinding extends BindingBase implements HitTestable, HitTes
 
   /// Determine which [HitTestTarget] objects are located at a given position.
   @override // from HitTestable
-  void hitTest(HitTestResult result, Point position) {
+  void hitTest(HitTestResult result, Offset position) {
     result.add(new HitTestEntry(this));
   }
 

packages/flutter/lib/src/gestures/converter.dart

@@ -28,7 +28,7 @@ class _PointerState {
     _down = false;
   }
 
-  Point lastPosition;
+  Offset lastPosition;
 }
 
 /// Converts from engine pointer data to framework pointer events.
@@ -36,7 +36,7 @@ class PointerEventConverter {
   // Map from platform pointer identifiers to PointerEvent pointer identifiers.
   static final Map<int, _PointerState> _pointers = <int, _PointerState>{};
 
-  static _PointerState _ensureStateForPointer(ui.PointerData datum, Point position) {
+  static _PointerState _ensureStateForPointer(ui.PointerData datum, Offset position) {
     return _pointers.putIfAbsent(
       datum.device,
       () => new _PointerState(position)
@@ -46,7 +46,7 @@ class PointerEventConverter {
   /// Expand the given packet of pointer data into a sequence of framework pointer events.
   static Iterable<PointerEvent> expand(Iterable<ui.PointerData> data, double devicePixelRatio) sync* {
     for (ui.PointerData datum in data) {
-      final Point position = new Point(datum.physicalX, datum.physicalY) / devicePixelRatio;
+      final Offset position = new Offset(datum.physicalX, datum.physicalY) / devicePixelRatio;
       final Duration timeStamp = datum.timeStamp;
       final PointerDeviceKind kind = datum.kind;
       assert(datum.change != null);

packages/flutter/lib/src/gestures/drag.dart

@@ -28,14 +28,14 @@ class DragDownDetails {
   /// Creates details for a [GestureDragDownCallback].
   ///
   /// The [globalPosition] argument must not be null.
-  DragDownDetails({ this.globalPosition: Point.origin }) {
+  DragDownDetails({ this.globalPosition: Offset.zero }) {
     assert(globalPosition != null);
   }
 
   /// The global position at which the pointer contacted the screen.
   ///
   /// Defaults to the origin if not specified in the constructor.
-  final Point globalPosition;
+  final Offset globalPosition;
 
   @override
   String toString() => '$runtimeType($globalPosition)';
@@ -61,14 +61,14 @@ class DragStartDetails {
   /// Creates details for a [GestureDragStartCallback].
   ///
   /// The [globalPosition] argument must not be null.
-  DragStartDetails({ this.globalPosition: Point.origin }) {
+  DragStartDetails({ this.globalPosition: Offset.zero }) {
     assert(globalPosition != null);
   }
 
   /// The global position at which the pointer contacted the screen.
   ///
   /// Defaults to the origin if not specified in the constructor.
-  final Point globalPosition;
+  final Offset globalPosition;
 
   @override
   String toString() => '$runtimeType($globalPosition)';
@@ -131,7 +131,7 @@ class DragUpdateDetails {
   final double primaryDelta;
 
   /// The pointer's global position when it triggered this update.
-  final Point globalPosition;
+  final Offset globalPosition;
 
   @override
   String toString() => '$runtimeType($delta)';
@@ -270,7 +270,7 @@ abstract class DragGestureRecognizer extends OneSequenceGestureRecognizer {
   double maxFlingVelocity;
 
   _DragState _state = _DragState.ready;
-  Point _initialPosition;
+  Offset _initialPosition;
   Offset _pendingDragOffset;
 
   bool _isFlingGesture(VelocityEstimate estimate);

packages/flutter/lib/src/gestures/events.dart

@@ -2,11 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:ui' show Point, Offset, PointerDeviceKind;
+import 'dart:ui' show Offset, PointerDeviceKind;
 
 import 'package:flutter/foundation.dart';
 
-export 'dart:ui' show Point, Offset, PointerDeviceKind;
+export 'dart:ui' show Offset, PointerDeviceKind;
 
 /// The bit of [PointerEvent.buttons] that corresponds to the primary mouse button.
 ///
@@ -77,7 +77,7 @@ abstract class PointerEvent {
     this.pointer: 0,
     this.kind: PointerDeviceKind.touch,
     this.device: 0,
-    this.position: Point.origin,
+    this.position: Offset.zero,
     this.delta: Offset.zero,
     this.buttons: 0,
     this.down: false,
@@ -109,7 +109,7 @@ abstract class PointerEvent {
 
   /// Coordinate of the position of the pointer, in logical pixels in the global
   /// coordinate space.
-  final Point position;
+  final Offset position;
 
   /// Distance in logical pixels that the pointer moved since the last
   /// PointerMoveEvent. Always 0.0 for down, up, and cancel events.
@@ -257,7 +257,7 @@ class PointerAddedEvent extends PointerEvent {
     Duration timeStamp: Duration.ZERO,
     PointerDeviceKind kind: PointerDeviceKind.touch,
     int device: 0,
-    Point position: Point.origin,
+    Offset position: Offset.zero,
     bool obscured: false,
     double pressureMin: 1.0,
     double pressureMax: 1.0,
@@ -331,7 +331,7 @@ class PointerHoverEvent extends PointerEvent {
     Duration timeStamp: Duration.ZERO,
     PointerDeviceKind kind: PointerDeviceKind.touch,
     int device: 0,
-    Point position: Point.origin,
+    Offset position: Offset.zero,
     Offset delta: Offset.zero,
     int buttons: 0,
     bool obscured: false,
@@ -377,7 +377,7 @@ class PointerDownEvent extends PointerEvent {
     int pointer: 0,
     PointerDeviceKind kind: PointerDeviceKind.touch,
     int device: 0,
-    Point position: Point.origin,
+    Offset position: Offset.zero,
     int buttons: 0,
     bool obscured: false,
     double pressure: 1.0,
@@ -429,7 +429,7 @@ class PointerMoveEvent extends PointerEvent {
     int pointer: 0,
     PointerDeviceKind kind: PointerDeviceKind.touch,
     int device: 0,
-    Point position: Point.origin,
+    Offset position: Offset.zero,
     Offset delta: Offset.zero,
     int buttons: 0,
     bool obscured: false,
@@ -477,7 +477,7 @@ class PointerUpEvent extends PointerEvent {
     int pointer: 0,
     PointerDeviceKind kind: PointerDeviceKind.touch,
     int device: 0,
-    Point position: Point.origin,
+    Offset position: Offset.zero,
     int buttons: 0,
     bool obscured: false,
     double pressureMin: 1.0,
@@ -518,7 +518,7 @@ class PointerCancelEvent extends PointerEvent {
     int pointer: 0,
     PointerDeviceKind kind: PointerDeviceKind.touch,
     int device: 0,
-    Point position: Point.origin,
+    Offset position: Offset.zero,
     int buttons: 0,
     bool obscured: false,
     double pressureMin: 1.0,

packages/flutter/lib/src/gestures/hit_test.dart

@@ -10,7 +10,7 @@ abstract class HitTestable { // ignore: one_member_abstracts
   ///
   /// If this given position hits this object, consider adding a [HitTestEntry]
   /// to the given hit test result.
-  void hitTest(HitTestResult result, Point position);
+  void hitTest(HitTestResult result, Offset position);
 }
 
 /// An object that can dispatch events.

packages/flutter/lib/src/gestures/multidrag.dart

@@ -3,7 +3,7 @@
 // found in the LICENSE file.
 
 import 'dart:async';
-import 'dart:ui' show Point, Offset;
+import 'dart:ui' show Offset;
 
 import 'package:flutter/foundation.dart';
 
@@ -16,7 +16,7 @@ import 'recognizer.dart';
 import 'velocity_tracker.dart';
 
 /// Signature for when [MultiDragGestureRecognizer] recognizes the start of a drag gesture.
-typedef Drag GestureMultiDragStartCallback(Point position);
+typedef Drag GestureMultiDragStartCallback(Offset position);
 
 /// Interface for receiving updates about drags from a [MultiDragGestureRecognizer].
 abstract class Drag {
@@ -49,7 +49,7 @@ abstract class MultiDragPointerState {
   }
 
   /// The global coordinates of the pointer when the pointer contacted the screen.
-  final Point initialPosition;
+  final Offset initialPosition;
 
   final VelocityTracker _velocityTracker = new VelocityTracker();
   Drag _client;
@@ -251,10 +251,10 @@ abstract class MultiDragGestureRecognizer<T extends MultiDragPointerState> exten
     final T state = _pointers[pointer];
     if (state == null)
       return; // We might already have canceled this drag if the up comes before the accept.
-    state.accepted((Point initialPosition) => _startDrag(initialPosition, pointer));
+    state.accepted((Offset initialPosition) => _startDrag(initialPosition, pointer));
   }
 
-  Drag _startDrag(Point initialPosition, int pointer) {
+  Drag _startDrag(Offset initialPosition, int pointer) {
     assert(_pointers != null);
     final T state = _pointers[pointer];
     assert(state != null);
@@ -303,7 +303,7 @@ abstract class MultiDragGestureRecognizer<T extends MultiDragPointerState> exten
 }
 
 class _ImmediatePointerState extends MultiDragPointerState {
-  _ImmediatePointerState(Point initialPosition) : super(initialPosition);
+  _ImmediatePointerState(Offset initialPosition) : super(initialPosition);
 
   @override
   void checkForResolutionAfterMove() {
@@ -340,7 +340,7 @@ class ImmediateMultiDragGestureRecognizer extends MultiDragGestureRecognizer<_Im
 
 
 class _HorizontalPointerState extends MultiDragPointerState {
-  _HorizontalPointerState(Point initialPosition) : super(initialPosition);
+  _HorizontalPointerState(Offset initialPosition) : super(initialPosition);
 
   @override
   void checkForResolutionAfterMove() {
@@ -377,7 +377,7 @@ class HorizontalMultiDragGestureRecognizer extends MultiDragGestureRecognizer<_H
 
 
 class _VerticalPointerState extends MultiDragPointerState {
-  _VerticalPointerState(Point initialPosition) : super(initialPosition);
+  _VerticalPointerState(Offset initialPosition) : super(initialPosition);
 
   @override
   void checkForResolutionAfterMove() {
@@ -413,7 +413,7 @@ class VerticalMultiDragGestureRecognizer extends MultiDragGestureRecognizer<_Ver
 }
 
 class _DelayedPointerState extends MultiDragPointerState {
-  _DelayedPointerState(Point initialPosition, Duration delay) : super(initialPosition) {
+  _DelayedPointerState(Offset initialPosition, Duration delay) : super(initialPosition) {
     assert(delay != null);
     _timer = new Timer(delay, _delayPassed);
   }

packages/flutter/lib/src/gestures/multitap.dart

@@ -3,7 +3,7 @@
 // found in the LICENSE file.
 
 import 'dart:async';
-import 'dart:ui' show Point, Offset;
+import 'dart:ui' show Offset;
 
 import 'arena.dart';
 import 'binding.dart';
@@ -41,7 +41,7 @@ class _TapTracker {
 
   final int pointer;
   final GestureArenaEntry entry;
-  final Point _initialPosition;
+  final Offset _initialPosition;
 
   bool _isTrackingPointer = false;
 
@@ -249,8 +249,8 @@ class _TapGesture extends _TapTracker {
   bool _wonArena = false;
   Timer _timer;
 
-  Point _lastPosition;
+  Offset _lastPosition;
-  Point _finalPosition;
+  Offset _finalPosition;
 
   void handleEvent(PointerEvent event) {
     assert(event.pointer == pointer);
@@ -374,7 +374,7 @@ class MultiTapGestureRecognizer extends GestureRecognizer {
       invokeCallback<Null>('onTapCancel', () => onTapCancel(pointer)); // ignore: STRONG_MODE_INVALID_CAST_FUNCTION_EXPR, https://github.com/dart-lang/sdk/issues/27504
   }
 
-  void _dispatchTap(int pointer, Point globalPosition) {
+  void _dispatchTap(int pointer, Offset globalPosition) {
     assert(_gestureMap.containsKey(pointer));
     _gestureMap.remove(pointer);
     if (onTapUp != null)
@@ -383,7 +383,7 @@ class MultiTapGestureRecognizer extends GestureRecognizer {
       invokeCallback<Null>('onTap', () => onTap(pointer)); // ignore: STRONG_MODE_INVALID_CAST_FUNCTION_EXPR, https://github.com/dart-lang/sdk/issues/27504
   }
 
-  void _dispatchLongTap(int pointer, Point lastPosition) {
+  void _dispatchLongTap(int pointer, Offset lastPosition) {
     assert(_gestureMap.containsKey(pointer));
     if (onLongTapDown != null)
       invokeCallback<Null>('onLongTapDown', () => onLongTapDown(pointer, new TapDownDetails(globalPosition: lastPosition))); // ignore: STRONG_MODE_INVALID_CAST_FUNCTION_EXPR, https://github.com/dart-lang/sdk/issues/27504

packages/flutter/lib/src/gestures/recognizer.dart

@@ -4,7 +4,7 @@
 
 import 'dart:async';
 import 'dart:collection';
-import 'dart:ui' show Point, Offset;
+import 'dart:ui' show Offset;
 
 import 'package:flutter/foundation.dart';
 
@@ -232,7 +232,7 @@ abstract class PrimaryPointerGestureRecognizer extends OneSequenceGestureRecogni
   int primaryPointer;
 
   /// The global location at which the primary pointer contacted the screen.
-  Point initialPosition;
+  Offset initialPosition;
 
   Timer _timer;
 

packages/flutter/lib/src/gestures/scale.dart

@@ -32,13 +32,13 @@ class ScaleStartDetails {
   /// Creates details for [GestureScaleStartCallback].
   ///
   /// The [focalPoint] argument must not be null.
-  ScaleStartDetails({ this.focalPoint: Point.origin }) {
+  ScaleStartDetails({ this.focalPoint: Offset.zero }) {
     assert(focalPoint != null);
   }
 
   /// The initial focal point of the pointers in contact with the screen.
   /// Reported in global coordinates.
-  final Point focalPoint;
+  final Offset focalPoint;
 
   @override
   String toString() => 'ScaleStartDetails(focalPoint: $focalPoint)';
@@ -50,14 +50,14 @@ class ScaleUpdateDetails {
   ///
   /// The [focalPoint] and [scale] arguments must not be null. The [scale]
   /// argument must be greater than or equal to zero.
-  ScaleUpdateDetails({ this.focalPoint: Point.origin, this.scale: 1.0 }) {
+  ScaleUpdateDetails({ this.focalPoint: Offset.zero, this.scale: 1.0 }) {
     assert(focalPoint != null);
     assert(scale != null && scale >= 0.0);
   }
 
   /// The focal point of the pointers in contact with the screen. Reported in
   /// global coordinates.
-  final Point focalPoint;
+  final Offset focalPoint;
 
   /// The scale implied by the pointers in contact with the screen. A value
   /// greater than or equal to zero.
@@ -121,11 +121,11 @@ class ScaleGestureRecognizer extends OneSequenceGestureRecognizer {
 
   _ScaleState _state = _ScaleState.ready;
 
-  Point _initialFocalPoint;
+  Offset _initialFocalPoint;
-  Point _currentFocalPoint;
+  Offset _currentFocalPoint;
   double _initialSpan;
   double _currentSpan;
-  Map<int, Point> _pointerLocations;
+  Map<int, Offset> _pointerLocations;
   final Map<int, VelocityTracker> _velocityTrackers = <int, VelocityTracker>{};
 
   double get _scaleFactor => _initialSpan > 0.0 ? _currentSpan / _initialSpan : 1.0;
@@ -138,7 +138,7 @@ class ScaleGestureRecognizer extends OneSequenceGestureRecognizer {
       _state = _ScaleState.possible;
       _initialSpan = 0.0;
       _currentSpan = 0.0;
-      _pointerLocations = <int, Point>{};
+      _pointerLocations = <int, Offset>{};
     }
   }
 
@@ -172,10 +172,10 @@ class ScaleGestureRecognizer extends OneSequenceGestureRecognizer {
     final int count = _pointerLocations.keys.length;
 
     // Compute the focal point
-    Point focalPoint = Point.origin;
+    Offset focalPoint = Offset.zero;
     for (int pointer in _pointerLocations.keys)
-      focalPoint += _pointerLocations[pointer].toOffset();
+      focalPoint += _pointerLocations[pointer];
-    _currentFocalPoint = count > 0 ? new Point(focalPoint.x / count, focalPoint.y / count) : Point.origin;
+    _currentFocalPoint = count > 0 ? focalPoint / count.toDouble() : Offset.zero;
 
     // Span is the average deviation from focal point
     double totalDeviation = 0.0;

packages/flutter/lib/src/gestures/tap.dart

@@ -12,12 +12,12 @@ class TapDownDetails {
   /// Creates details for a [GestureTapDownCallback].
   ///
   /// The [globalPosition] argument must not be null.
-  TapDownDetails({ this.globalPosition: Point.origin }) {
+  TapDownDetails({ this.globalPosition: Offset.zero }) {
     assert(globalPosition != null);
   }
 
   /// The global position at which the pointer contacted the screen.
-  final Point globalPosition;
+  final Offset globalPosition;
 }
 
 /// Signature for when a pointer that might cause a tap has contacted the
@@ -32,12 +32,12 @@ class TapUpDetails {
   /// Creates details for a [GestureTapUpCallback].
   ///
   /// The [globalPosition] argument must not be null.
-  TapUpDetails({ this.globalPosition: Point.origin }) {
+  TapUpDetails({ this.globalPosition: Offset.zero }) {
     assert(globalPosition != null);
   }
 
   /// The global position at which the pointer contacted the screen.
-  final Point globalPosition;
+  final Offset globalPosition;
 }
 
 /// Signature for when a pointer that will trigger a tap has stopped contacting
@@ -85,7 +85,7 @@ class TapGestureRecognizer extends PrimaryPointerGestureRecognizer {
 
   bool _sentTapDown = false;
   bool _wonArenaForPrimaryPointer = false;
-  Point _finalPosition;
+  Offset _finalPosition;
 
   @override
   void handlePrimaryPointer(PointerEvent event) {

packages/flutter/lib/src/gestures/velocity_tracker.dart

@@ -2,11 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:ui' show Point, Offset;
+import 'dart:ui' show Offset;
 
 import 'lsq_solver.dart';
 
-export 'dart:ui' show Point, Offset;
+export 'dart:ui' show Offset;
 
 /// A velocity in two dimensions.
 class Velocity {
@@ -119,7 +119,7 @@ class _PointAtTime {
   const _PointAtTime(this.point, this.time);
 
   final Duration time;
-  final Point point;
+  final Offset point;
 
   @override
   String toString() => '_PointAtTime($point at $time)';
@@ -148,7 +148,7 @@ class VelocityTracker {
   int _index = 0;
 
   /// Adds a position as the given time to the tracker.
-  void addPosition(Duration time, Point position) {
+  void addPosition(Duration time, Offset position) {
     _index += 1;
     if (_index == _kHistorySize)
       _index = 0;
@@ -186,9 +186,9 @@ class VelocityTracker {
         break;
 
       oldestSample = sample;
-      final Point position = sample.point;
+      final Offset position = sample.point;
-      x.add(position.x);
+      x.add(position.dx);
-      y.add(position.y);
+      y.add(position.dy);
       w.add(1.0);
       time.add(-age);
       index = (index == 0 ? _kHistorySize : index) - 1;

packages/flutter/lib/src/material/arc.dart

@@ -13,7 +13,7 @@ import 'package:flutter/painting.dart';
 // vertical or horizontal.
 const double _kOnAxisDelta = 2.0;
 
-/// A [Tween] that animates a [Point] along a circular arc.
+/// A [Tween] that animates an [Offset] along a circular arc.
 ///
 /// The arc's radius is related to the bounding box that contains the [begin]
 /// and [end] points. If the bounding box is taller than it is wide, then the
@@ -27,14 +27,14 @@ const double _kOnAxisDelta = 2.0;
 /// See also:
 ///
 /// * [MaterialRectArcTween]
-class MaterialPointArcTween extends Tween<Point> {
+class MaterialPointArcTween extends Tween<Offset> {
-  /// Creates a [Tween] for animating [Point]s along a circular arc.
+  /// Creates a [Tween] for animating [Offset]s along a circular arc.
   ///
   /// The [begin] and [end] points are required, cannot be null, and are
   /// immutable.
   MaterialPointArcTween({
-    @required Point begin,
+    @required Offset begin,
-    @required Point end
+    @required Offset end
   }) : super(begin: begin, end: end) {
     assert(begin != null);
     assert(end != null);
@@ -43,43 +43,43 @@ class MaterialPointArcTween extends Tween<Point> {
     final double deltaX = delta.dx.abs();
     final double deltaY = delta.dy.abs();
     final double distanceFromAtoB = delta.distance;
-    final Point c = new Point(end.x, begin.y);
+    final Offset c = new Offset(end.dx, begin.dy);
 
     double sweepAngle() => 2.0 * math.asin(distanceFromAtoB / (2.0 * _radius));
 
     if (deltaX > _kOnAxisDelta && deltaY > _kOnAxisDelta) {
       if (deltaX < deltaY) {
         _radius = distanceFromAtoB * distanceFromAtoB / (c - begin).distance / 2.0;
-        _center = new Point(end.x + _radius * (begin.x - end.x).sign, end.y);
+        _center = new Offset(end.dx + _radius * (begin.dx - end.dx).sign, end.dy);
-        if (begin.x < end.x) {
+        if (begin.dx < end.dx) {
-          _beginAngle = sweepAngle() * (begin.y - end.y).sign;
+          _beginAngle = sweepAngle() * (begin.dy - end.dy).sign;
           _endAngle = 0.0;
         } else {
-          _beginAngle = math.PI + sweepAngle() * (end.y - begin.y).sign;
+          _beginAngle = math.PI + sweepAngle() * (end.dy - begin.dy).sign;
           _endAngle = math.PI;
         }
       } else {
         _radius = distanceFromAtoB * distanceFromAtoB / (c - end).distance / 2.0;
-        _center = new Point(begin.x, begin.y + (end.y - begin.y).sign * _radius);
+        _center = new Offset(begin.dx, begin.dy + (end.dy - begin.dy).sign * _radius);
-        if (begin.y < end.y) {
+        if (begin.dy < end.dy) {
           _beginAngle = -math.PI / 2.0;
-          _endAngle = _beginAngle + sweepAngle() * (end.x - begin.x).sign;
+          _endAngle = _beginAngle + sweepAngle() * (end.dx - begin.dx).sign;
         } else {
           _beginAngle = math.PI / 2.0;
-          _endAngle = _beginAngle + sweepAngle() * (begin.x - end.x).sign;
+          _endAngle = _beginAngle + sweepAngle() * (begin.dx - end.dx).sign;
         }
       }
     }
   }
 
-  Point _center;
+  Offset _center;
   double _radius;
   double _beginAngle;
   double _endAngle;
 
   /// The center of the circular arc, null if [begin] and [end] are horiztonally or
   /// vertically aligned.
-  Point get center => _center;
+  Offset get center => _center;
 
   /// The radius of the circular arc, null if begin and end are horiztonally or
   /// vertically aligned.
@@ -96,24 +96,24 @@ class MaterialPointArcTween extends Tween<Point> {
 
   /// Setting the arc's [begin] parameter is not supported. Construct a new arc instead.
   @override
-  set begin(Point value) {
+  set begin(Offset value) {
     assert(false); // not supported
   }
 
   /// Setting the arc's [end] parameter is not supported. Construct a new arc instead.
   @override
-  set end(Point value) {
+  set end(Offset value) {
     assert(false); // not supported
   }
 
   @override
-  Point lerp(double t) {
+  Offset lerp(double t) {
     if (t == 0.0)
       return begin;
     if (t == 1.0)
       return end;
     if (_beginAngle == null || _endAngle == null)
-      return Point.lerp(begin, end, t);
+      return Offset.lerp(begin, end, t);
     final double angle = lerpDouble(_beginAngle, _endAngle, t);
     final double x = math.cos(angle) * _radius;
     final double y = math.sin(angle) * _radius;
@@ -186,7 +186,7 @@ T _maxBy<T>(Iterable<T> input, _KeyFunc<T> keyFunc) {
 ///
 /// See also:
 ///
-/// * [MaterialPointArcTween]. the analogue for [Point] interporation.
+/// * [MaterialPointArcTween]. the analogue for [Offset] interporation.
 /// * [RectTween], which does a linear rectangle interpolation.
 class MaterialRectArcTween extends RectTween {
   /// Creates a [Tween] for animating [Rect]s along a circular arc.
@@ -215,14 +215,14 @@ class MaterialRectArcTween extends RectTween {
   MaterialPointArcTween _beginArc;
   MaterialPointArcTween _endArc;
 
-  Point _cornerFor(Rect rect, _CornerId id) {
+  Offset _cornerFor(Rect rect, _CornerId id) {
     switch (id) {
       case _CornerId.topLeft: return rect.topLeft;
       case _CornerId.topRight: return rect.topRight;
       case _CornerId.bottomLeft: return rect.bottomLeft;
       case _CornerId.bottomRight: return rect.bottomRight;
     }
-    return Point.origin;
+    return Offset.zero;
   }
 
   double _diagonalSupport(Offset centersVector, _Diagonal diagonal) {

packages/flutter/lib/src/material/bottom_navigation_bar.dart

@@ -571,7 +571,7 @@ class _RadialPainter extends CustomPainter {
       final Rect rect = new Rect.fromLTWH(0.0, 0.0, size.width, size.height);
       canvas.clipRect(rect);
       final double navWidth = math.min(bottomNavMaxWidth, size.width);
-      final Point center = new Point(
+      final Offset center = new Offset(
         (size.width - navWidth) / 2.0 + circle.offset.dx * navWidth,
         circle.offset.dy * size.height
       );

packages/flutter/lib/src/material/checkbox.dart

@@ -172,7 +172,7 @@ class _RenderCheckbox extends RenderToggleable {
     final double offsetX = offset.dx + (size.width - _kEdgeSize) / 2.0;
     final double offsetY = offset.dy + (size.height - _kEdgeSize) / 2.0;
 
-    paintRadialReaction(canvas, offset, size.center(Point.origin));
+    paintRadialReaction(canvas, offset, size.center(Offset.zero));
 
     final double t = position.value;
 
@@ -203,14 +203,14 @@ class _RenderCheckbox extends RenderToggleable {
         ..style = PaintingStyle.stroke
         ..strokeWidth = _kStrokeWidth;
       final Path path = new Path();
-      final Point start = const Point(_kEdgeSize * 0.15, _kEdgeSize * 0.45);
+      final Offset start = const Offset(_kEdgeSize * 0.15, _kEdgeSize * 0.45);
-      final Point mid = const Point(_kEdgeSize * 0.4, _kEdgeSize * 0.7);
+      final Offset mid = const Offset(_kEdgeSize * 0.4, _kEdgeSize * 0.7);
-      final Point end = const Point(_kEdgeSize * 0.85, _kEdgeSize * 0.25);
+      final Offset end = const Offset(_kEdgeSize * 0.85, _kEdgeSize * 0.25);
-      final Point drawStart = Point.lerp(start, mid, 1.0 - value);
+      final Offset drawStart = Offset.lerp(start, mid, 1.0 - value);
-      final Point drawEnd = Point.lerp(mid, end, value);
+      final Offset drawEnd = Offset.lerp(mid, end, value);
-      path.moveTo(offsetX + drawStart.x, offsetY + drawStart.y);
+      path.moveTo(offsetX + drawStart.dx, offsetY + drawStart.dy);
-      path.lineTo(offsetX + mid.x, offsetY + mid.y);
+      path.lineTo(offsetX + mid.dx, offsetY + mid.dy);
-      path.lineTo(offsetX + drawEnd.x, offsetY + drawEnd.y);
+      path.lineTo(offsetX + drawEnd.dx, offsetY + drawEnd.dy);
       canvas.drawPath(path, paint);
     }
   }

packages/flutter/lib/src/material/dropdown.dart

@@ -62,7 +62,7 @@ class _DropdownMenuPainter extends CustomPainter {
 
     final Rect rect = new Rect.fromLTRB(0.0, top.evaluate(resize), size.width, bottom.evaluate(resize));
 
-    _painter.paint(canvas, rect.topLeft.toOffset(), new ImageConfiguration(size: rect.size));
+    _painter.paint(canvas, rect.topLeft, new ImageConfiguration(size: rect.size));
   }
 
   @override
@@ -231,7 +231,7 @@ class _DropdownMenuRouteLayout<T> extends SingleChildLayoutDelegate {
       top = bottom - childSize.height;
     }
     assert(() {
-      final Rect container = Point.origin & size;
+      final Rect container = Offset.zero & size;
       if (container.intersect(buttonRect) == buttonRect) {
         // If the button was entirely on-screen, then verify
         // that the menu is also on-screen.
@@ -499,7 +499,7 @@ class _DropdownButtonState<T> extends State<DropdownButton<T>> {
 
   void _handleTap() {
     final RenderBox itemBox = context.findRenderObject();
-    final Rect itemRect = itemBox.localToGlobal(Point.origin) & itemBox.size;
+    final Rect itemRect = itemBox.localToGlobal(Offset.zero) & itemBox.size;
     Navigator.push(context, new _DropdownRoute<T>(
       items: widget.items,
       buttonRect: _kMenuHorizontalPadding.inflateRect(itemRect),

packages/flutter/lib/src/material/ink_highlight.dart

@@ -131,7 +131,7 @@ class InkHighlight extends InkFeature {
   void paintFeature(Canvas canvas, Matrix4 transform) {
     final Paint paint = new Paint()..color = color.withAlpha(_alpha.value);
     final Offset originOffset = MatrixUtils.getAsTranslation(transform);
-    final Rect rect = (_rectCallback != null ? _rectCallback() : Point.origin & referenceBox.size);
+    final Rect rect = (_rectCallback != null ? _rectCallback() : Offset.zero & referenceBox.size);
     if (originOffset == null) {
       canvas.save();
       canvas.transform(transform.storage);

packages/flutter/lib/src/material/ink_splash.dart

@@ -22,11 +22,11 @@ RectCallback _getClipCallback(RenderBox referenceBox, bool containedInkWell, Rec
     return rectCallback;
   }
   if (containedInkWell)
-    return () => Point.origin & referenceBox.size;
+    return () => Offset.zero & referenceBox.size;
   return null;
 }
 
-double _getTargetRadius(RenderBox referenceBox, bool containedInkWell, RectCallback rectCallback, Point position) {
+double _getTargetRadius(RenderBox referenceBox, bool containedInkWell, RectCallback rectCallback, Offset position) {
   if (containedInkWell) {
     final Size size = rectCallback != null ? rectCallback().size : referenceBox.size;
     return _getSplashRadiusForPoistionInSize(size, position);
@@ -34,11 +34,11 @@ double _getTargetRadius(RenderBox referenceBox, bool containedInkWell, RectCallb
   return Material.defaultSplashRadius;
 }
 
-double _getSplashRadiusForPoistionInSize(Size bounds, Point position) {
+double _getSplashRadiusForPoistionInSize(Size bounds, Offset position) {
-  final double d1 = (position - bounds.topLeft(Point.origin)).distance;
+  final double d1 = (position - bounds.topLeft(Offset.zero)).distance;
-  final double d2 = (position - bounds.topRight(Point.origin)).distance;
+  final double d2 = (position - bounds.topRight(Offset.zero)).distance;
-  final double d3 = (position - bounds.bottomLeft(Point.origin)).distance;
+  final double d3 = (position - bounds.bottomLeft(Offset.zero)).distance;
-  final double d4 = (position - bounds.bottomRight(Point.origin)).distance;
+  final double d4 = (position - bounds.bottomRight(Offset.zero)).distance;
   return math.max(math.max(d1, d2), math.max(d3, d4)).ceilToDouble();
 }
 
@@ -76,7 +76,7 @@ class InkSplash extends InkFeature {
   InkSplash({
     @required MaterialInkController controller,
     @required RenderBox referenceBox,
-    Point position,
+    Offset position,
     Color color,
     bool containedInkWell: false,
     RectCallback rectCallback,
@@ -109,7 +109,7 @@ class InkSplash extends InkFeature {
     controller.addInkFeature(this);
   }
 
-  final Point _position;
+  final Offset _position;
   final BorderRadius _borderRadius;
   final double _targetRadius;
   final RectCallback _clipCallback;
@@ -185,9 +185,9 @@ class InkSplash extends InkFeature {
   @override
   void paintFeature(Canvas canvas, Matrix4 transform) {
     final Paint paint = new Paint()..color = _color.withAlpha(_alpha.value);
-    Point center = _position;
+    Offset center = _position;
     if (_repositionToReferenceBox)
-      center = Point.lerp(center, referenceBox.size.center(Point.origin), _radiusController.value);
+      center = Offset.lerp(center, referenceBox.size.center(Offset.zero), _radiusController.value);
     final Offset originOffset = MatrixUtils.getAsTranslation(transform);
     if (originOffset == null) {
       canvas.save();

packages/flutter/lib/src/material/material.dart

@@ -340,7 +340,7 @@ class _RenderInkFeatures extends RenderProxyBox implements MaterialInkController
   }
 
   @override
-  bool hitTestSelf(Point position) => true;
+  bool hitTestSelf(Offset position) => true;
 
   @override
   void paint(PaintingContext context, Offset offset) {
@@ -348,7 +348,7 @@ class _RenderInkFeatures extends RenderProxyBox implements MaterialInkController
       final Canvas canvas = context.canvas;
       canvas.save();
       canvas.translate(offset.dx, offset.dy);
-      canvas.clipRect(Point.origin & size);
+      canvas.clipRect(Offset.zero & size);
       for (InkFeature inkFeature in _inkFeatures)
         inkFeature._paint(canvas);
       canvas.restore();

packages/flutter/lib/src/material/popup_menu.dart

@@ -524,15 +524,17 @@ class PopupMenuButton<T> extends StatefulWidget {
 class _PopupMenuButtonState<T> extends State<PopupMenuButton<T>> {
   void showButtonMenu() {
     final RenderBox renderBox = context.findRenderObject();
-    final Point topLeft = renderBox.localToGlobal(Point.origin);
+    final Offset topLeft = renderBox.localToGlobal(Offset.zero);
     showMenu<T>(
       context: context,
       elevation: widget.elevation,
       items: widget.itemBuilder(context),
       initialValue: widget.initialValue,
       position: new RelativeRect.fromLTRB(
-        topLeft.x, topLeft.y + (widget.initialValue != null ? renderBox.size.height / 2.0 : 0.0),
+        topLeft.dx,
-        0.0, 0.0
+        topLeft.dy + (widget.initialValue != null ? renderBox.size.height / 2.0 : 0.0),
+        0.0,
+        0.0,
       )
     )
     .then<Null>((T newValue) {

packages/flutter/lib/src/material/progress_indicator.dart

@@ -89,18 +89,18 @@ class _LinearProgressIndicatorPainter extends CustomPainter {
     final Paint paint = new Paint()
       ..color = backgroundColor
       ..style = PaintingStyle.fill;
-    canvas.drawRect(Point.origin & size, paint);
+    canvas.drawRect(Offset.zero & size, paint);
 
     paint.color = valueColor;
     if (value != null) {
       final double width = value.clamp(0.0, 1.0) * size.width;
-      canvas.drawRect(Point.origin & new Size(width, size.height), paint);
+      canvas.drawRect(Offset.zero & new Size(width, size.height), paint);
     } else {
       final double startX = size.width * (1.5 * animationValue - 0.5);
       final double endX = startX + 0.5 * size.width;
       final double x = startX.clamp(0.0, size.width);
       final double width = endX.clamp(0.0, size.width) - x;
-      canvas.drawRect(new Point(x, 0.0) & new Size(width, size.height), paint);
+      canvas.drawRect(new Offset(x, 0.0) & new Size(width, size.height), paint);
     }
   }
 
@@ -239,7 +239,7 @@ class _CircularProgressIndicatorPainter extends CustomPainter {
     if (value == null) // Indeterminate
       paint.strokeCap = StrokeCap.square;
 
-    canvas.drawArc(Point.origin & size, arcStart, arcSweep, false, paint);
+    canvas.drawArc(Offset.zero & size, arcStart, arcSweep, false, paint);
   }
 
   @override

packages/flutter/lib/src/material/radio.dart

@@ -190,9 +190,9 @@ class _RenderRadio extends RenderToggleable {
   void paint(PaintingContext context, Offset offset) {
     final Canvas canvas = context.canvas;
 
-    paintRadialReaction(canvas, offset, const Point(kRadialReactionRadius, kRadialReactionRadius));
+    paintRadialReaction(canvas, offset, const Offset(kRadialReactionRadius, kRadialReactionRadius));
 
-    final Point center = (offset & size).center;
+    final Offset center = (offset & size).center;
     final Color radioColor = onChanged != null ? activeColor : inactiveColor;
 
     // Outer circle

packages/flutter/lib/src/material/scrollbar.dart

@@ -143,13 +143,13 @@ class _ScrollbarController extends ChangeNotifier {
   Paint get _paint => new Paint()..color = color.withOpacity(_opacity.value);
 
   void _paintVerticalThumb(Canvas canvas, Size size, double thumbOffset, double thumbExtent) {
-    final Point thumbOrigin = new Point(size.width - _kThumbGirth, thumbOffset);
+    final Offset thumbOrigin = new Offset(size.width - _kThumbGirth, thumbOffset);
     final Size thumbSize = new Size(_kThumbGirth, thumbExtent);
     canvas.drawRect(thumbOrigin & thumbSize, _paint);
   }
 
   void _paintHorizontalThumb(Canvas canvas, Size size, double thumbOffset, double thumbExtent) {
-    final Point thumbOrigin = new Point(thumbOffset, size.height - _kThumbGirth);
+    final Offset thumbOrigin = new Offset(thumbOffset, size.height - _kThumbGirth);
     final Size thumbSize = new Size(thumbExtent, _kThumbGirth);
     canvas.drawRect(thumbOrigin & thumbSize, _paint);
   }

packages/flutter/lib/src/material/slider.dart

@@ -389,8 +389,8 @@ class _RenderSlider extends RenderConstrainedBox implements SemanticsActionHandl
 
   bool get isInteractive => onChanged != null;
 
-  double _getValueFromGlobalPosition(Point globalPosition) {
+  double _getValueFromGlobalPosition(Offset globalPosition) {
-    return (globalToLocal(globalPosition).x - _kReactionRadius) / _trackLength;
+    return (globalToLocal(globalPosition).dx - _kReactionRadius) / _trackLength;
   }
 
   double _discretize(double value) {
@@ -430,7 +430,7 @@ class _RenderSlider extends RenderConstrainedBox implements SemanticsActionHandl
   }
 
   @override
-  bool hitTestSelf(Point position) => true;
+  bool hitTestSelf(Offset position) => true;
 
   @override
   void handleEvent(PointerEvent event, BoxHitTestEntry entry) {
@@ -461,7 +461,7 @@ class _RenderSlider extends RenderConstrainedBox implements SemanticsActionHandl
     final Paint primaryPaint = new Paint()..color = enabled ? _activeColor : _kInactiveTrackColor;
     final Paint trackPaint = new Paint()..color = _kTrackColorTween.evaluate(_reaction);
 
-    final Point thumbCenter = new Point(trackActive, trackCenter);
+    final Offset thumbCenter = new Offset(trackActive, trackCenter);
     final double thumbRadius = enabled ? _kThumbRadiusTween.evaluate(_reaction) : _kDisabledThumbRadius;
 
     if (enabled) {
@@ -495,22 +495,22 @@ class _RenderSlider extends RenderConstrainedBox implements SemanticsActionHandl
       }
 
       if (label != null) {
-        final Point center = new Point(trackActive, _kLabelBalloonCenterTween.evaluate(_reaction) + trackCenter);
+        final Offset center = new Offset(trackActive, _kLabelBalloonCenterTween.evaluate(_reaction) + trackCenter);
         final double radius = _kLabelBalloonRadiusTween.evaluate(_reaction);
-        final Point tip = new Point(trackActive, _kLabelBalloonTipTween.evaluate(_reaction) + trackCenter);
+        final Offset tip = new Offset(trackActive, _kLabelBalloonTipTween.evaluate(_reaction) + trackCenter);
         final double tipAttachment = _kLabelBalloonTipAttachmentRatio * radius;
 
         canvas.drawCircle(center, radius, primaryPaint);
         final Path path = new Path()
-          ..moveTo(tip.x, tip.y)
+          ..moveTo(tip.dx, tip.dy)
-          ..lineTo(center.x - tipAttachment, center.y + tipAttachment)
+          ..lineTo(center.dx - tipAttachment, center.dy + tipAttachment)
-          ..lineTo(center.x + tipAttachment, center.y + tipAttachment)
+          ..lineTo(center.dx + tipAttachment, center.dy + tipAttachment)
           ..close();
         canvas.drawPath(path, primaryPaint);
         _labelPainter.layout();
         final Offset labelOffset = new Offset(
-          center.x - _labelPainter.width / 2.0,
+          center.dx - _labelPainter.width / 2.0,
-          center.y - _labelPainter.height / 2.0
+          center.dy - _labelPainter.height / 2.0
         );
         _labelPainter.paint(canvas, labelOffset);
         return;

packages/flutter/lib/src/material/stepper.dart

@@ -652,7 +652,7 @@ class _TrianglePainter extends CustomPainter {
   final Color color;
 
   @override
-  bool hitTest(Point point) => true; // Hitting the rectangle is fine enough.
+  bool hitTest(Offset point) => true; // Hitting the rectangle is fine enough.
 
   @override
   bool shouldRepaint(_TrianglePainter oldPainter) {
@@ -664,10 +664,10 @@ class _TrianglePainter extends CustomPainter {
     final double base = size.width;
     final double halfBase = size.width / 2.0;
     final double height = size.height;
-    final List<Point> points = <Point>[
+    final List<Offset> points = <Offset>[
-      new Point(0.0, height),
+      new Offset(0.0, height),
-      new Point(base, height),
+      new Offset(base, height),
-      new Point(halfBase, 0.0),
+      new Offset(halfBase, 0.0),
     ];
 
     canvas.drawPath(

packages/flutter/lib/src/material/switch.dart

@@ -365,7 +365,7 @@ class _RenderSwitch extends RenderToggleable {
     final RRect trackRRect = new RRect.fromRectAndRadius(trackRect, const Radius.circular(_kTrackRadius));
     canvas.drawRRect(trackRRect, paint);
 
-    final Point thumbPosition = new Point(
+    final Offset thumbPosition = new Offset(
       kRadialReactionRadius + currentPosition * _trackInnerLength,
       size.height / 2.0
     );
@@ -389,7 +389,7 @@ class _RenderSwitch extends RenderToggleable {
       final double radius = _kThumbRadius - inset;
       thumbPainter.paint(
         canvas,
-        thumbPosition.toOffset() + offset - new Offset(radius, radius),
+        thumbPosition + offset - new Offset(radius, radius),
         configuration.copyWith(size: new Size.fromRadius(radius))
       );
     } finally {

packages/flutter/lib/src/material/text_selection.dart

@@ -92,7 +92,7 @@ class _TextSelectionToolbar extends StatelessWidget {
 class _TextSelectionToolbarLayout extends SingleChildLayoutDelegate {
   _TextSelectionToolbarLayout(this.position);
 
-  final Point position;
+  final Offset position;
 
   @override
   BoxConstraints getConstraintsForChild(BoxConstraints constraints) {
@@ -101,8 +101,8 @@ class _TextSelectionToolbarLayout extends SingleChildLayoutDelegate {
 
   @override
   Offset getPositionForChild(Size size, Size childSize) {
-    double x = position.x - childSize.width/2.0;
+    double x = position.dx - childSize.width / 2.0;
-    double y = position.y - childSize.height;
+    double y = position.dy - childSize.height;
 
     if (x < _kToolbarScreenPadding)
       x = _kToolbarScreenPadding;
@@ -133,7 +133,7 @@ class _TextSelectionHandlePainter extends CustomPainter {
   void paint(Canvas canvas, Size size) {
     final Paint paint = new Paint()..color = color;
     final double radius = size.width/2.0;
-    canvas.drawCircle(new Point(radius, radius), radius, paint);
+    canvas.drawCircle(new Offset(radius, radius), radius, paint);
     canvas.drawRect(new Rect.fromLTWH(0.0, 0.0, radius, radius), paint);
   }
 
@@ -150,7 +150,7 @@ class _MaterialTextSelectionControls extends TextSelectionControls {
   /// Builder for material-style copy/paste text selection toolbar.
   @override
   Widget buildToolbar(
-      BuildContext context, Point position, TextSelectionDelegate delegate) {
+      BuildContext context, Offset position, TextSelectionDelegate delegate) {
     final Size screenSize = MediaQuery.of(context).size;
     return new ConstrainedBox(
       constraints: new BoxConstraints.loose(screenSize),

packages/flutter/lib/src/material/time_picker.dart

@@ -393,7 +393,7 @@ class _DialPainter extends CustomPainter {
   void paint(Canvas canvas, Size size) {
     final double radius = size.shortestSide / 2.0;
     final Offset center = new Offset(size.width / 2.0, size.height / 2.0);
-    final Point centerPoint = center.toPoint();
+    final Offset centerPoint = center;
     canvas.drawCircle(centerPoint, radius, new Paint()..color = backgroundColor);
 
     const double labelPadding = 24.0;
@@ -418,7 +418,7 @@ class _DialPainter extends CustomPainter {
 
     final Paint selectorPaint = new Paint()
       ..color = accentColor;
-    final Point focusedPoint = getOffsetForTheta(theta).toPoint();
+    final Offset focusedPoint = getOffsetForTheta(theta);
     final double focusedRadius = labelPadding - 4.0;
     canvas.drawCircle(centerPoint, 4.0, selectorPaint);
     canvas.drawCircle(focusedPoint, focusedRadius, selectorPaint);
@@ -549,15 +549,15 @@ class _DialState extends State<_Dial> with SingleTickerProviderStateMixin {
     });
   }
 
-  Point _position;
+  Offset _position;
-  Point _center;
+  Offset _center;
 
   void _handlePanStart(DragStartDetails details) {
     assert(!_dragging);
     _dragging = true;
     final RenderBox box = context.findRenderObject();
     _position = box.globalToLocal(details.globalPosition);
-    _center = box.size.center(Point.origin);
+    _center = box.size.center(Offset.zero);
     _updateThetaForPan();
     _notifyOnChangedIfNeeded();
   }

packages/flutter/lib/src/material/toggleable.dart

@@ -191,7 +191,7 @@ abstract class RenderToggleable extends RenderConstrainedBox implements Semantic
   bool get isInteractive => onChanged != null;
 
   TapGestureRecognizer _tap;
-  Point _downPosition;
+  Offset _downPosition;
 
   @override
   void attach(PipelineOwner owner) {
@@ -257,7 +257,7 @@ abstract class RenderToggleable extends RenderConstrainedBox implements Semantic
   }
 
   @override
-  bool hitTestSelf(Point position) => true;
+  bool hitTestSelf(Offset position) => true;
 
   @override
   void handleEvent(PointerEvent event, BoxHitTestEntry entry) {
@@ -272,11 +272,11 @@ abstract class RenderToggleable extends RenderConstrainedBox implements Semantic
   /// origin is the center point of the reaction (usually distinct from the
   /// point at which the user interacted with the control, which is handled
   /// automatically).
-  void paintRadialReaction(Canvas canvas, Offset offset, Point origin) {
+  void paintRadialReaction(Canvas canvas, Offset offset, Offset origin) {
     if (!_reaction.isDismissed) {
       // TODO(abarth): We should have a different reaction color when position is zero.
       final Paint reactionPaint = new Paint()..color = activeColor.withAlpha(kRadialReactionAlpha);
-      final Point center = Point.lerp(_downPosition ?? origin, origin, _reaction.value);
+      final Offset center = Offset.lerp(_downPosition ?? origin, origin, _reaction.value);
       final double radius = _kRadialReactionRadiusTween.evaluate(_reaction);
       canvas.drawCircle(center + offset, radius, reactionPaint);
     }

packages/flutter/lib/src/material/tooltip.dart

@@ -119,7 +119,7 @@ class _TooltipState extends State<Tooltip> with SingleTickerProviderStateMixin {
       return;  // Already visible.
     }
     final RenderBox box = context.findRenderObject();
-    final Point target = box.localToGlobal(box.size.center(Point.origin));
+    final Offset target = box.localToGlobal(box.size.center(Offset.zero));
     // We create this widget outside of the overlay entry's builder to prevent
     // updated values from happening to leak into the overlay when the overlay
     // rebuilds.
@@ -195,7 +195,7 @@ class _TooltipPositionDelegate extends SingleChildLayoutDelegate {
     this.preferBelow
   });
 
-  final Point target;
+  final Offset target;
   final double verticalOffset;
   final bool preferBelow;
 
@@ -205,16 +205,16 @@ class _TooltipPositionDelegate extends SingleChildLayoutDelegate {
   @override
   Offset getPositionForChild(Size size, Size childSize) {
     // VERTICAL DIRECTION
-    final bool fitsBelow = target.y + verticalOffset + childSize.height <= size.height - _kScreenEdgeMargin;
+    final bool fitsBelow = target.dy + verticalOffset + childSize.height <= size.height - _kScreenEdgeMargin;
-    final bool fitsAbove = target.y - verticalOffset - childSize.height >= _kScreenEdgeMargin;
+    final bool fitsAbove = target.dy - verticalOffset - childSize.height >= _kScreenEdgeMargin;
     final bool tooltipBelow = preferBelow ? fitsBelow || !fitsAbove : !(fitsAbove || !fitsBelow);
     double y;
     if (tooltipBelow)
-      y = math.min(target.y + verticalOffset, size.height - _kScreenEdgeMargin);
+      y = math.min(target.dy + verticalOffset, size.height - _kScreenEdgeMargin);
     else
-      y = math.max(target.y - verticalOffset - childSize.height, _kScreenEdgeMargin);
+      y = math.max(target.dy - verticalOffset - childSize.height, _kScreenEdgeMargin);
     // HORIZONTAL DIRECTION
-    final double normalizedTargetX = target.x.clamp(_kScreenEdgeMargin, size.width - _kScreenEdgeMargin);
+    final double normalizedTargetX = target.dx.clamp(_kScreenEdgeMargin, size.width - _kScreenEdgeMargin);
     double x;
     if (normalizedTargetX < _kScreenEdgeMargin + childSize.width / 2.0) {
       x = _kScreenEdgeMargin;
@@ -250,7 +250,7 @@ class _TooltipOverlay extends StatelessWidget {
   final double height;
   final EdgeInsets padding;
   final Animation<double> animation;
-  final Point target;
+  final Offset target;
   final double verticalOffset;
   final bool preferBelow;
 

packages/flutter/lib/src/painting/basic_types.dart

@@ -18,7 +18,6 @@ export 'dart:ui' show
   PaintingStyle,
   Path,
   PathFillType,
-  Point,
   Radius,
   RRect,
   RSTransform,

packages/flutter/lib/src/painting/box_fit.dart

@@ -89,7 +89,7 @@ class FittedSizes {
 /// ```dart
 /// final Size imageSize = new Size(image.width.toDouble(), image.height.toDouble());
 /// final FittedSizes sizes = applyBoxFit(fit, imageSize, outputRect.size);
-/// final Rect inputSubrect = FractionalOffset.center.inscribe(sizes.source, Point.origin & imageSize);
+/// final Rect inputSubrect = FractionalOffset.center.inscribe(sizes.source, Offset.zero & imageSize);
 /// final Rect outputSubrect = FractionalOffset.center.inscribe(sizes.destination, outputRect);
 /// canvas.drawImageRect(image, inputSubrect, outputSubrect, paint);
 /// ```

packages/flutter/lib/src/painting/box_painter.dart

@@ -668,8 +668,9 @@ class LinearGradient extends Gradient {
   @override
   Shader createShader(Rect rect) {
     return new ui.Gradient.linear(
-      <Point>[begin.withinRect(rect), end.withinRect(rect)],
+      begin.withinRect(rect),
-      colors, stops, tileMode
+      end.withinRect(rect),
+      colors, stops, tileMode,
     );
   }
 
@@ -938,7 +939,7 @@ void paintImage({
   }
   final double dx = (outputSize.width - destinationSize.width) * (alignment?.dx ?? 0.5);
   final double dy = (outputSize.height - destinationSize.height) * (alignment?.dy ?? 0.5);
-  final Point destinationPosition = rect.topLeft + new Offset(dx, dy);
+  final Offset destinationPosition = rect.topLeft.translate(dx, dy);
   final Rect destinationRect = destinationPosition & destinationSize;
   if (repeat != ImageRepeat.noRepeat) {
     canvas.save();
@@ -946,7 +947,7 @@ void paintImage({
   }
   if (centerSlice == null) {
     final Rect sourceRect = (alignment ?? FractionalOffset.center).inscribe(
-      fittedSizes.source, Point.origin & inputSize
+      fittedSizes.source, Offset.zero & inputSize
     );
     for (Rect tileRect in _generateImageTileRects(rect, destinationRect, repeat))
       canvas.drawImageRect(image, sourceRect, tileRect, paint);
@@ -1228,19 +1229,19 @@ class BoxDecoration extends Decoration {
   }
 
   @override
-  bool hitTest(Size size, Point position) {
+  bool hitTest(Size size, Offset position) {
     assert(shape != null);
-    assert((Point.origin & size).contains(position));
+    assert((Offset.zero & size).contains(position));
     switch (shape) {
       case BoxShape.rectangle:
         if (borderRadius != null) {
-          final RRect bounds = borderRadius.toRRect(Point.origin & size);
+          final RRect bounds = borderRadius.toRRect(Offset.zero & size);
           return bounds.contains(position);
         }
         return true;
       case BoxShape.circle:
         // Circles are inscribed into our smallest dimension.
-        final Point center = size.center(Point.origin);
+        final Offset center = size.center(Offset.zero);
         final double distance = (position - center).distance;
         return distance <= math.min(size.width, size.height) / 2.0;
     }
@@ -1292,7 +1293,7 @@ class _BoxDecorationPainter extends BoxPainter {
     switch (_decoration.shape) {
       case BoxShape.circle:
         assert(_decoration.borderRadius == null);
-        final Point center = rect.center;
+        final Offset center = rect.center;
         final double radius = rect.shortestSide / 2.0;
         canvas.drawCircle(center, radius, paint);
         break;

packages/flutter/lib/src/painting/decoration.dart

@@ -10,7 +10,7 @@ import 'edge_insets.dart';
 
 export 'package:flutter/services.dart' show ImageConfiguration;
 
-export 'basic_types.dart' show Point, Offset, Size;
+export 'basic_types.dart' show Offset, Size;
 export 'edge_insets.dart' show EdgeInsets;
 
 // This group of classes is intended for painting in cartesian coordinates.
@@ -71,7 +71,7 @@ abstract class Decoration {
   /// if the decoration only draws a circle, this function might
   /// return true if the point was inside the circle and false
   /// otherwise.
-  bool hitTest(Size size, Point position) => true;
+  bool hitTest(Size size, Offset position) => true;
 
   /// Returns a [BoxPainter] that will paint this decoration.
   ///

packages/flutter/lib/src/painting/flutter_logo.dart

@@ -174,7 +174,7 @@ class FlutterLogoDecoration extends Decoration {
 
   @override
   // TODO(ianh): better hit testing
-  bool hitTest(Size size, Point position) => true;
+  bool hitTest(Size size, Offset position) => true;
 
   @override
   BoxPainter createBoxPainter([VoidCallback onChanged]) {
@@ -275,10 +275,8 @@ class _FlutterLogoPainter extends BoxPainter {
       ..color = _config.darkColor;
 
     final ui.Gradient triangleGradient = new ui.Gradient.linear(
-      const <Point>[
+      const Offset(87.2623 + 37.9092, 28.8384 + 123.4389),
-        const Point(87.2623 + 37.9092, 28.8384 + 123.4389),
+      const Offset(42.9205 + 37.9092, 35.0952 + 123.4389),
-        const Point(42.9205 + 37.9092, 35.0952 + 123.4389),
-      ],
       <Color>[
         const Color(0xBFFFFFFF),
         const Color(0xBFFCFCFC),
@@ -290,17 +288,15 @@ class _FlutterLogoPainter extends BoxPainter {
         const Color(0xBF6E6E6E),
         const Color(0xBF616161),
       ],
-      <double>[ 0.2690, 0.4093, 0.4972, 0.5708, 0.6364, 0.6968, 0.7533, 0.8058, 0.8219 ]
+      <double>[ 0.2690, 0.4093, 0.4972, 0.5708, 0.6364, 0.6968, 0.7533, 0.8058, 0.8219 ],
     );
     final Paint trianglePaint = new Paint()
       ..shader = triangleGradient
       ..blendMode = BlendMode.multiply;
 
     final ui.Gradient rectangleGradient = new ui.Gradient.linear(
-      const <Point>[
+      const Offset(62.3643 + 37.9092, 40.135 + 123.4389),
-        const Point(62.3643 + 37.9092, 40.135 + 123.4389),
+      const Offset(54.0376 + 37.9092, 31.8083 + 123.4389),
-        const Point(54.0376 + 37.9092, 31.8083 + 123.4389),
-      ],
       <Color>[
         const Color(0x80FFFFFF),
         const Color(0x80FCFCFC),
@@ -440,11 +436,11 @@ class _FlutterLogoPainter extends BoxPainter {
         );
         canvas.save();
         if (_config._position < 1.0) {
-          final Point center = logoSquare.center;
+          final Offset center = logoSquare.center;
           final Path path = new Path()
-            ..moveTo(center.x, center.y)
+            ..moveTo(center.dx, center.dy)
-            ..lineTo(center.x + rect.width, center.y - rect.width)
+            ..lineTo(center.dx + rect.width, center.dy - rect.width)
-            ..lineTo(center.x + rect.width, center.y + rect.width)
+            ..lineTo(center.dx + rect.width, center.dy + rect.width)
             ..close();
           canvas.clipPath(path);
         }
@@ -462,7 +458,7 @@ class _FlutterLogoPainter extends BoxPainter {
           canvas.save();
         }
         canvas.translate(
-          logoTargetSquare.center.x - (_textBoundingRect.width * scale / 2.0),
+          logoTargetSquare.center.dx - (_textBoundingRect.width * scale / 2.0),
           logoTargetSquare.bottom
         );
         canvas.scale(scale, scale);
@@ -471,7 +467,8 @@ class _FlutterLogoPainter extends BoxPainter {
           canvas.drawRect(_textBoundingRect.inflate(_textBoundingRect.width * 0.5), new Paint()
             ..blendMode = BlendMode.modulate
             ..shader = new ui.Gradient.linear(
-              <Point>[new Point(_textBoundingRect.width * -0.5, 0.0), new Point(_textBoundingRect.width * 1.5, 0.0)],
+              new Offset(_textBoundingRect.width * -0.5, 0.0),
+              new Offset(_textBoundingRect.width * 1.5, 0.0),
               <Color>[const Color(0xFFFFFFFF), const Color(0xFFFFFFFF), const Color(0x00FFFFFF), const Color(0x00FFFFFF)],
               <double>[ 0.0, math.max(0.0, _config._position.abs() - 0.1), math.min(_config._position.abs() + 0.1, 1.0), 1.0 ],
             )

packages/flutter/lib/src/painting/fractional_offset.dart

@@ -103,8 +103,8 @@ class FractionalOffset {
   }
 
   /// Returns the point that is this fraction within the given rect.
-  Point withinRect(Rect rect) {
+  Offset withinRect(Rect rect) {
-    return new Point(rect.left + dx * rect.width, rect.top + dy * rect.height);
+    return new Offset(rect.left + dx * rect.width, rect.top + dy * rect.height);
   }
 
   /// Returns a rect of the given size, centered at this fraction of the given rect.

packages/flutter/lib/src/painting/transforms.dart

@@ -94,10 +94,10 @@ class MatrixUtils {
   ///
   /// This function assumes the given point has a z-coordinate of 0.0. The
   /// z-coordinate of the result is ignored.
-  static Point transformPoint(Matrix4 transform, Point point) {
+  static Offset transformPoint(Matrix4 transform, Offset point) {
-    final Vector3 position3 = new Vector3(point.x, point.y, 0.0);
+    final Vector3 position3 = new Vector3(point.dx, point.dy, 0.0);
     final Vector3 transformed3 = transform.perspectiveTransform(position3);
-    return new Point(transformed3.x, transformed3.y);
+    return new Offset(transformed3.x, transformed3.y);
   }
 
   /// Returns a rect that bounds the result of applying the given matrix as a
@@ -107,15 +107,15 @@ class MatrixUtils {
   /// The transformed rect is then projected back into the plane with z equals
   /// 0.0 before computing its bounding rect.
   static Rect transformRect(Matrix4 transform, Rect rect) {
-    final Point point1 = transformPoint(transform, rect.topLeft);
+    final Offset point1 = transformPoint(transform, rect.topLeft);
-    final Point point2 = transformPoint(transform, rect.topRight);
+    final Offset point2 = transformPoint(transform, rect.topRight);
-    final Point point3 = transformPoint(transform, rect.bottomLeft);
+    final Offset point3 = transformPoint(transform, rect.bottomLeft);
-    final Point point4 = transformPoint(transform, rect.bottomRight);
+    final Offset point4 = transformPoint(transform, rect.bottomRight);
     return new Rect.fromLTRB(
-        _min4(point1.x, point2.x, point3.x, point4.x),
+        _min4(point1.dx, point2.dx, point3.dx, point4.dx),
-        _min4(point1.y, point2.y, point3.y, point4.y),
+        _min4(point1.dy, point2.dy, point3.dy, point4.dy),
-        _max4(point1.x, point2.x, point3.x, point4.x),
+        _max4(point1.dx, point2.dx, point3.dx, point4.dx),
-        _max4(point1.y, point2.y, point3.y, point4.y)
+        _max4(point1.dy, point2.dy, point3.dy, point4.dy)
     );
   }
 

packages/flutter/lib/src/rendering/animated_size.dart

@@ -153,7 +153,7 @@ class RenderAnimatedSize extends RenderAligningShiftedBox {
   @override
   void paint(PaintingContext context, Offset offset) {
     if (child != null && _hasVisualOverflow) {
-      final Rect rect = Point.origin & size;
+      final Rect rect = Offset.zero & size;
       context.pushClipRect(needsCompositing, offset, rect, super.paint);
     } else {
       super.paint(context, offset);

packages/flutter/lib/src/rendering/binding.dart

@@ -243,7 +243,7 @@ abstract class RendererBinding extends BindingBase implements SchedulerBinding,
   }
 
   @override
-  void hitTest(HitTestResult result, Point position) {
+  void hitTest(HitTestResult result, Offset position) {
     assert(renderView != null);
     renderView.hitTest(result, position: position);
     // This super call is safe since it will be bound to a mixed-in declaration.

packages/flutter/lib/src/rendering/block.dart

@@ -242,7 +242,7 @@ class RenderListBody extends RenderBox
   }
 
   @override
-  bool hitTestChildren(HitTestResult result, { Point position }) {
+  bool hitTestChildren(HitTestResult result, { Offset position }) {
     return defaultHitTestChildren(result, position: position);
   }
 

packages/flutter/lib/src/rendering/box.dart

@@ -509,7 +509,7 @@ class BoxHitTestEntry extends HitTestEntry {
   RenderBox get target => super.target;
 
   /// The position of the hit test in the local coordinates of [target].
-  final Point localPosition;
+  final Offset localPosition;
 
   @override
   String toString() => '${target.runtimeType}#${target.hashCode}@$localPosition';
@@ -899,7 +899,7 @@ class _IntrinsicDimensionsCacheEntry {
 /// [hitTestChildren]. When implementing hit testing, you can either override
 /// these latter two methods, or ignore them and just override [hitTest].
 ///
-/// The [hitTest] method itself is given a [Point], and must return true if the
+/// The [hitTest] method itself is given an [Offset], and must return true if the
 /// object or one of its children has absorbed the hit (preventing objects below
 /// this one from being hit), or false if the hit can continue to other objects
 /// below this one.
@@ -1424,7 +1424,7 @@ abstract class RenderBox extends RenderObject {
   }
 
   @override
-  Rect get semanticBounds => Point.origin & size;
+  Rect get semanticBounds => Offset.zero & size;
 
   @override
   void debugResetSize() {
@@ -1691,7 +1691,7 @@ abstract class RenderBox extends RenderObject {
   /// called. For example, a render object might be a child of a [RenderOpacity]
   /// object, which calls [hitTest] on its children when its opacity is zero
   /// even through it does not [paint] its children.
-  bool hitTest(HitTestResult result, { @required Point position }) {
+  bool hitTest(HitTestResult result, { @required Offset position }) {
     assert(() {
       if (!hasSize) {
         if (debugNeedsLayout) {
@@ -1719,8 +1719,7 @@ abstract class RenderBox extends RenderObject {
       }
       return true;
     });
-    if (position.x >= 0.0 && position.x < _size.width &&
+    if (_size.contains(position)) {
-        position.y >= 0.0 && position.y < _size.height) {
       if (hitTestChildren(result, position: position) || hitTestSelf(position)) {
         result.add(new BoxHitTestEntry(this, position));
         return true;
@@ -1735,7 +1734,7 @@ abstract class RenderBox extends RenderObject {
   /// Used by [hitTest]. If you override [hitTest] and do not call this
   /// function, then you don't need to implement this function.
   @protected
-  bool hitTestSelf(Point position) => false;
+  bool hitTestSelf(Offset position) => false;
 
   /// Override this method to check whether any children are located at the
   /// given position.
@@ -1747,7 +1746,7 @@ abstract class RenderBox extends RenderObject {
   /// Used by [hitTest]. If you override [hitTest] and do not call this
   /// function, then you don't need to implement this function.
   @protected
-  bool hitTestChildren(HitTestResult result, { Point position }) => false;
+  bool hitTestChildren(HitTestResult result, { Offset position }) => false;
 
   /// Multiply the transform from the parent's coordinate system to this box's
   /// coordinate system into the given transform.
@@ -1808,16 +1807,16 @@ abstract class RenderBox extends RenderObject {
   /// coordinate system for this box.
   ///
   /// If the transform from global coordinates to local coordinates is
-  /// degenerate, this function returns [Point.origin].
+  /// degenerate, this function returns [Offset.zero].
   ///
   /// If `ancestor` is non-null, this function converts the given point from the
   /// coordinate system of `ancestor` (which must be an ancestor of this render
   /// object) instead of from the global coordinate system.
-  Point globalToLocal(Point point, { RenderObject ancestor }) {
+  Offset globalToLocal(Offset point, { RenderObject ancestor }) {
     final Matrix4 transform = getTransformTo(ancestor);
     final double det = transform.invert();
     if (det == 0.0)
-      return Point.origin;
+      return Offset.zero;
     return MatrixUtils.transformPoint(transform, point);
   }
 
@@ -1827,7 +1826,7 @@ abstract class RenderBox extends RenderObject {
   /// If `ancestor` is non-null, this function converts the given point to the
   /// coordinate system of `ancestor` (which must be an ancestor of this render
   /// object) instead of to the global coordinate system.
-  Point localToGlobal(Point point, { RenderObject ancestor }) {
+  Offset localToGlobal(Offset point, { RenderObject ancestor }) {
     return MatrixUtils.transformPoint(getTransformTo(ancestor), point);
   }
 
@@ -1845,7 +1844,7 @@ abstract class RenderBox extends RenderObject {
   ///
   /// The returned paint bounds are in the local coordinate system of this box.
   @override
-  Rect get paintBounds => Point.origin & size;
+  Rect get paintBounds => Offset.zero & size;
 
   /// Override this method to handle pointer events that hit this render object.
   ///
@@ -2039,14 +2038,12 @@ abstract class RenderBoxContainerDefaultsMixin<ChildType extends RenderBox, Pare
   ///
   /// Stops walking once after the first child reports that it contains the
   /// given point. Returns whether any children contain the given point.
-  bool defaultHitTestChildren(HitTestResult result, { Point position }) {
+  bool defaultHitTestChildren(HitTestResult result, { Offset position }) {
     // the x, y parameters have the top left of the node's box as the origin
     ChildType child = lastChild;
     while (child != null) {
       final ParentDataType childParentData = child.parentData;
-      final Point transformed = new Point(position.x - childParentData.offset.dx,
+      if (child.hitTest(result, position: position - childParentData.offset))
-                                    position.y - childParentData.offset.dy);
-      if (child.hitTest(result, position: transformed))
         return true;
       child = childParentData.previousSibling;
     }

packages/flutter/lib/src/rendering/custom_layout.dart

@@ -344,7 +344,7 @@ class RenderCustomMultiChildLayoutBox extends RenderBox
   }
 
   @override
-  bool hitTestChildren(HitTestResult result, { Point position }) {
+  bool hitTestChildren(HitTestResult result, { Offset position }) {
     return defaultHitTestChildren(result, position: position);
   }
 }

packages/flutter/lib/src/rendering/editable.dart

@@ -36,7 +36,7 @@ class TextSelectionPoint {
   }
 
   /// Screen coordinates of the lower left or lower right corner of the selection.
-  final Point point;
+  final Offset point;
 
   /// Direction of the text at this edge of the selection.
   final TextDirection direction;
@@ -271,12 +271,12 @@ class RenderEditable extends RenderBox {
     if (selection.isCollapsed) {
       // TODO(mpcomplete): This doesn't work well at an RTL/LTR boundary.
       final Offset caretOffset = _textPainter.getOffsetForCaret(selection.extent, _caretPrototype);
-      final Point start = new Point(0.0, _preferredLineHeight) + caretOffset + paintOffset;
+      final Offset start = new Offset(0.0, _preferredLineHeight) + caretOffset + paintOffset;
       return <TextSelectionPoint>[new TextSelectionPoint(localToGlobal(start), null)];
     } else {
       final List<ui.TextBox> boxes = _textPainter.getBoxesForSelection(selection);
-      final Point start = new Point(boxes.first.start, boxes.first.bottom) + paintOffset;
+      final Offset start = new Offset(boxes.first.start, boxes.first.bottom) + paintOffset;
-      final Point end = new Point(boxes.last.end, boxes.last.bottom) + paintOffset;
+      final Offset end = new Offset(boxes.last.end, boxes.last.bottom) + paintOffset;
       return <TextSelectionPoint>[
         new TextSelectionPoint(localToGlobal(start), boxes.first.direction),
         new TextSelectionPoint(localToGlobal(end), boxes.last.direction),
@@ -285,9 +285,9 @@ class RenderEditable extends RenderBox {
   }
 
   /// Returns the position in the text for the given global coordinate.
-  TextPosition getPositionForPoint(Point globalPosition) {
+  TextPosition getPositionForPoint(Offset globalPosition) {
     globalPosition += -_paintOffset;
-    return _textPainter.getPositionForOffset(globalToLocal(globalPosition).toOffset());
+    return _textPainter.getPositionForOffset(globalToLocal(globalPosition));
   }
 
   /// Returns the Rect in local coordinates for the caret at the given text
@@ -311,7 +311,7 @@ class RenderEditable extends RenderBox {
   }
 
   @override
-  bool hitTestSelf(Point position) => true;
+  bool hitTestSelf(Offset position) => true;
 
   TapGestureRecognizer _tap;
   LongPressGestureRecognizer _longPress;
@@ -325,18 +325,18 @@ class RenderEditable extends RenderBox {
     }
   }
 
-  Point _lastTapDownPosition;
+  Offset _lastTapDownPosition;
-  Point _longPressPosition;
+  Offset _longPressPosition;
   void _handleTapDown(TapDownDetails details) {
     _lastTapDownPosition = details.globalPosition + -_paintOffset;
   }
 
   void _handleTap() {
     assert(_lastTapDownPosition != null);
-    final Point globalPosition = _lastTapDownPosition;
+    final Offset globalPosition = _lastTapDownPosition;
     _lastTapDownPosition = null;
     if (onSelectionChanged != null) {
-      final TextPosition position = _textPainter.getPositionForOffset(globalToLocal(globalPosition).toOffset());
+      final TextPosition position = _textPainter.getPositionForOffset(globalToLocal(globalPosition));
       onSelectionChanged(new TextSelection.fromPosition(position), this, false);
     }
   }
@@ -348,10 +348,10 @@ class RenderEditable extends RenderBox {
   }
 
   void _handleLongPress() {
-    final Point globalPosition = _longPressPosition;
+    final Offset globalPosition = _longPressPosition;
     _longPressPosition = null;
     if (onSelectionChanged != null) {
-      final TextPosition position = _textPainter.getPositionForOffset(globalToLocal(globalPosition).toOffset());
+      final TextPosition position = _textPainter.getPositionForOffset(globalToLocal(globalPosition));
       onSelectionChanged(_selectWordAtOffset(position), this, true);
     }
   }
@@ -419,13 +419,13 @@ class RenderEditable extends RenderBox {
   @override
   void paint(PaintingContext context, Offset offset) {
     if (_hasVisualOverflow)
-      context.pushClipRect(needsCompositing, offset, Point.origin & size, _paintContents);
+      context.pushClipRect(needsCompositing, offset, Offset.zero & size, _paintContents);
     else
       _paintContents(context, offset);
   }
 
   @override
-  Rect describeApproximatePaintClip(RenderObject child) => _hasVisualOverflow ? Point.origin & size : null;
+  Rect describeApproximatePaintClip(RenderObject child) => _hasVisualOverflow ? Offset.zero & size : null;
 
   @override
   void debugFillDescription(List<String> description) {

packages/flutter/lib/src/rendering/error.dart

@@ -73,7 +73,7 @@ class RenderErrorBox extends RenderBox {
   bool get sizedByParent => true;
 
   @override
-  bool hitTestSelf(Point position) => true;
+  bool hitTestSelf(Offset position) => true;
 
   @override
   void performResize() {

packages/flutter/lib/src/rendering/flex.dart

@@ -681,7 +681,7 @@ class RenderFlex extends RenderBox with ContainerRenderObjectMixin<RenderBox, Fl
   }
 
   @override
-  bool hitTestChildren(HitTestResult result, { Point position }) {
+  bool hitTestChildren(HitTestResult result, { Offset position }) {
     return defaultHitTestChildren(result, position: position);
   }
 
@@ -693,7 +693,7 @@ class RenderFlex extends RenderBox with ContainerRenderObjectMixin<RenderBox, Fl
     }
 
     // We have overflow. Clip it.
-    context.pushClipRect(needsCompositing, offset, Point.origin & size, defaultPaint);
+    context.pushClipRect(needsCompositing, offset, Offset.zero & size, defaultPaint);
 
     assert(() {
       // In debug mode, if you have overflow, we highlight where the
@@ -729,7 +729,7 @@ class RenderFlex extends RenderBox with ContainerRenderObjectMixin<RenderBox, Fl
   }
 
   @override
-  Rect describeApproximatePaintClip(RenderObject child) => _overflow > 0.0 ? Point.origin & size : null;
+  Rect describeApproximatePaintClip(RenderObject child) => _overflow > 0.0 ? Offset.zero & size : null;
 
   @override
   String toString() {

packages/flutter/lib/src/rendering/flow.dart

@@ -364,11 +364,11 @@ class RenderFlow extends RenderBox
 
   @override
   void paint(PaintingContext context, Offset offset) {
-    context.pushClipRect(needsCompositing, offset, Point.origin & size, _paintWithDelegate);
+    context.pushClipRect(needsCompositing, offset, Offset.zero & size, _paintWithDelegate);
   }
 
   @override
-  bool hitTestChildren(HitTestResult result, { Point position }) {
+  bool hitTestChildren(HitTestResult result, { Offset position }) {
     final List<RenderBox> children = getChildrenAsList();
     for (int i = _lastPaintOrder.length - 1; i >= 0; --i) {
       final int childIndex = _lastPaintOrder[i];
@@ -386,7 +386,7 @@ class RenderFlow extends RenderBox
         // on screen and cannot be hit.
         continue;
       }
-      final Point childPosition = MatrixUtils.transformPoint(inverse, position);
+      final Offset childPosition = MatrixUtils.transformPoint(inverse, position);
       if (child.hitTest(result, position: childPosition))
         return true;
     }

packages/flutter/lib/src/rendering/image.dart

@@ -216,7 +216,7 @@ class RenderImage extends RenderBox {
   }
 
   @override
-  bool hitTestSelf(Point position) => true;
+  bool hitTestSelf(Offset position) => true;
 
   @override
   void performLayout() {

packages/flutter/lib/src/rendering/object.dart

@@ -1249,7 +1249,7 @@ class PipelineOwner {
 ///
 /// The general behaviour of your hit-testing method should be similar to the
 /// behavior described for [RenderBox]. The main difference is that the input
-/// need not be a [Point]. You are also allowed to use a different subclass of
+/// need not be an [Offset]. You are also allowed to use a different subclass of
 /// [HitTestEntry] when adding entries to the [HitTestResult]. When the
 /// [handleEvent] method is called, the same object that was added to the
 /// [HitTestResult] will be passed in, so it can be used to track information
@@ -2480,7 +2480,7 @@ abstract class RenderObject extends AbstractNode implements HitTestTarget {
   // (with the signature being whatever passes for coordinates for this
   // particular class):
   //
-  // bool hitTest(HitTestResult result, { Point position }) {
+  // bool hitTest(HitTestResult result, { Offset position }) {
   //   // If the given position is not inside this node, then return false.
   //   // Otherwise:
   //   // For each child that intersects the position, in z-order starting from

packages/flutter/lib/src/rendering/paragraph.dart

@@ -172,7 +172,7 @@ class RenderParagraph extends RenderBox {
   }
 
   @override
-  bool hitTestSelf(Point position) => true;
+  bool hitTestSelf(Offset position) => true;
 
   @override
   void handleEvent(PointerEvent event, BoxHitTestEntry entry) {
@@ -180,7 +180,7 @@ class RenderParagraph extends RenderBox {
     if (event is! PointerDownEvent)
       return;
     _layoutTextWithConstraints(constraints);
-    final Offset offset = entry.localPosition.toOffset();
+    final Offset offset = entry.localPosition;
     final TextPosition position = _textPainter.getPositionForOffset(offset);
     final TextSpan span = _textPainter.text.getSpanForPosition(position);
     span?.recognizer?.addPointer(event);
@@ -222,15 +222,17 @@ class RenderParagraph extends RenderBox {
             final double fadeStart = fadeEnd - fadeSizePainter.width;
             // TODO(abarth): This shader has an LTR bias.
             _overflowShader = new ui.Gradient.linear(
-              <Point>[new Point(fadeStart, 0.0), new Point(fadeEnd, 0.0)],
+              new Offset(fadeStart, 0.0),
-              <Color>[const Color(0xFFFFFFFF), const Color(0x00FFFFFF)]
+              new Offset(fadeEnd, 0.0),
+              <Color>[const Color(0xFFFFFFFF), const Color(0x00FFFFFF)],
             );
           } else {
             final double fadeEnd = size.height;
             final double fadeStart = fadeEnd - fadeSizePainter.height / 2.0;
             _overflowShader = new ui.Gradient.linear(
-              <Point>[new Point(0.0, fadeStart), new Point(0.0, fadeEnd)],
+              new Offset(0.0, fadeStart),
-              <Color>[const Color(0xFFFFFFFF), const Color(0x00FFFFFF)]
+              new Offset(0.0, fadeEnd),
+              <Color>[const Color(0xFFFFFFFF), const Color(0x00FFFFFF)],
             );
           }
           break;
@@ -279,7 +281,7 @@ class RenderParagraph extends RenderBox {
         final Paint paint = new Paint()
           ..blendMode = BlendMode.modulate
           ..shader = _overflowShader;
-        canvas.drawRect(Point.origin & size, paint);
+        canvas.drawRect(Offset.zero & size, paint);
       }
       canvas.restore();
     }

packages/flutter/lib/src/rendering/proxy_box.dart

@@ -105,7 +105,7 @@ abstract class RenderProxyBoxMixin implements RenderBox, RenderObjectWithChildMi
   }
 
   @override
-  bool hitTestChildren(HitTestResult result, { Point position }) {
+  bool hitTestChildren(HitTestResult result, { Offset position }) {
     return child?.hitTest(result, position: position) ?? false;
   }
 
@@ -150,10 +150,9 @@ abstract class RenderProxyBoxWithHitTestBehavior extends RenderProxyBox {
   HitTestBehavior behavior;
 
   @override
-  bool hitTest(HitTestResult result, { Point position }) {
+  bool hitTest(HitTestResult result, { Offset position }) {
     bool hitTarget = false;
-    if (position.x >= 0.0 && position.x < size.width &&
+    if (size.contains(position)) {
-        position.y >= 0.0 && position.y < size.height) {
       hitTarget = hitTestChildren(result, position: position) || hitTestSelf(position);
       if (hitTarget || behavior == HitTestBehavior.translucent)
         result.add(new BoxHitTestEntry(this, position));
@@ -162,7 +161,7 @@ abstract class RenderProxyBoxWithHitTestBehavior extends RenderProxyBox {
   }
 
   @override
-  bool hitTestSelf(Point position) => behavior == HitTestBehavior.opaque;
+  bool hitTestSelf(Offset position) => behavior == HitTestBehavior.opaque;
 
   @override
   void debugFillDescription(List<String> description) {
@@ -821,7 +820,7 @@ class RenderShaderMask extends RenderProxyBox {
   void paint(PaintingContext context, Offset offset) {
     if (child != null) {
       assert(needsCompositing);
-      final Rect rect = Point.origin & size;
+      final Rect rect = Offset.zero & size;
       context.pushShaderMask(offset, _shaderCallback(rect), rect, _blendMode, super.paint);
     }
   }
@@ -908,7 +907,7 @@ abstract class CustomClipper<T> {
   /// the RenderObject. If getClip returns a shape that is roughly the
   /// same size as the RenderObject (e.g. it's a rounded rectangle
   /// with very small arcs in the corners), then this may be adequate.
-  Rect getApproximateClipRect(Size size) => Point.origin & size;
+  Rect getApproximateClipRect(Size size) => Offset.zero & size;
 
   /// Called whenever a new instance of the custom clipper delegate class is
   /// provided to the clip object, or any time that a new clip object is created
@@ -989,7 +988,7 @@ abstract class _RenderCustomClip<T> extends RenderProxyBox {
 
   @override
   Rect describeApproximatePaintClip(RenderObject child) {
-    return _clipper?.getApproximateClipRect(size) ?? Point.origin & size;
+    return _clipper?.getApproximateClipRect(size) ?? Offset.zero & size;
   }
 }
 
@@ -1009,10 +1008,10 @@ class RenderClipRect extends _RenderCustomClip<Rect> {
   }) : super(child: child, clipper: clipper);
 
   @override
-  Rect get _defaultClip => Point.origin & size;
+  Rect get _defaultClip => Offset.zero & size;
 
   @override
-  bool hitTest(HitTestResult result, { Point position }) {
+  bool hitTest(HitTestResult result, { Offset position }) {
     if (_clipper != null) {
       _updateClip();
       assert(_clip != null);
@@ -1068,10 +1067,10 @@ class RenderClipRRect extends _RenderCustomClip<RRect> {
   }
 
   @override
-  RRect get _defaultClip => _borderRadius.toRRect(Point.origin & size);
+  RRect get _defaultClip => _borderRadius.toRRect(Offset.zero & size);
 
   @override
-  bool hitTest(HitTestResult result, { Point position }) {
+  bool hitTest(HitTestResult result, { Offset position }) {
     if (_clipper != null) {
       _updateClip();
       assert(_clip != null);
@@ -1117,16 +1116,16 @@ class RenderClipOval extends _RenderCustomClip<Rect> {
   }
 
   @override
-  Rect get _defaultClip => Point.origin & size;
+  Rect get _defaultClip => Offset.zero & size;
 
   @override
-  bool hitTest(HitTestResult result, { Point position }) {
+  bool hitTest(HitTestResult result, { Offset position }) {
     _updateClip();
     assert(_clip != null);
-    final Point center = _clip.center;
+    final Offset center = _clip.center;
     // convert the position to an offset from the center of the unit circle
-    final Offset offset = new Offset((position.x - center.x) / _clip.width,
+    final Offset offset = new Offset((position.dx - center.dx) / _clip.width,
-                               (position.y - center.y) / _clip.height);
+                                     (position.dy - center.dy) / _clip.height);
     // check if the point is outside the unit circle
     if (offset.distanceSquared > 0.25) // x^2 + y^2 > r^2
       return false;
@@ -1166,10 +1165,10 @@ class RenderClipPath extends _RenderCustomClip<Path> {
   }) : super(child: child, clipper: clipper);
 
   @override
-  Path get _defaultClip => new Path()..addRect(Point.origin & size);
+  Path get _defaultClip => new Path()..addRect(Offset.zero & size);
 
   @override
-  bool hitTest(HitTestResult result, { Point position }) {
+  bool hitTest(HitTestResult result, { Offset position }) {
     if (_clipper != null) {
       _updateClip();
       assert(_clip != null);
@@ -1183,7 +1182,7 @@ class RenderClipPath extends _RenderCustomClip<Path> {
   void paint(PaintingContext context, Offset offset) {
     if (child != null) {
       _updateClip();
-      context.pushClipPath(needsCompositing, offset, Point.origin & size, _clip, super.paint);
+      context.pushClipPath(needsCompositing, offset, Offset.zero & size, _clip, super.paint);
     }
   }
 }
@@ -1260,15 +1259,15 @@ class RenderPhysicalModel extends _RenderCustomClip<RRect> {
   @override
   RRect get _defaultClip {
     if (_shape == BoxShape.rectangle) {
-      return _borderRadius.toRRect(Point.origin & size);
+      return _borderRadius.toRRect(Offset.zero & size);
     } else {
-      final Rect rect = Point.origin & size;
+      final Rect rect = Offset.zero & size;
       return new RRect.fromRectXY(rect, rect.width / 2, rect.height / 2);
     }
   }
 
   @override
-  bool hitTest(HitTestResult result, { Point position }) {
+  bool hitTest(HitTestResult result, { Offset position }) {
     if (_clipper != null) {
       _updateClip();
       assert(_clip != null);
@@ -1368,7 +1367,7 @@ class RenderDecoratedBox extends RenderProxyBox {
   }
 
   @override
-  bool hitTestSelf(Point position) {
+  bool hitTestSelf(Offset position) {
     return _decoration.hitTest(size, position);
   }
 
@@ -1543,7 +1542,7 @@ class RenderTransform extends RenderProxyBox {
   }
 
   @override
-  bool hitTest(HitTestResult result, { Point position }) {
+  bool hitTest(HitTestResult result, { Offset position }) {
     if (transformHitTests) {
       Matrix4 inverse;
       try {
@@ -1660,8 +1659,8 @@ class RenderFittedBox extends RenderProxyBox {
       final FittedSizes sizes = applyBoxFit(_fit, childSize, size);
       final double scaleX = sizes.destination.width / sizes.source.width;
       final double scaleY = sizes.destination.height / sizes.source.height;
-      final Rect sourceRect = _alignment.inscribe(sizes.source, Point.origin & childSize);
+      final Rect sourceRect = _alignment.inscribe(sizes.source, Offset.zero & childSize);
-      final Rect destinationRect = _alignment.inscribe(sizes.destination, Point.origin & size);
+      final Rect destinationRect = _alignment.inscribe(sizes.destination, Offset.zero & size);
       _hasVisualOverflow = sourceRect.width < childSize.width || sourceRect.height < childSize.width;
       _transform = new Matrix4.translationValues(destinationRect.left, destinationRect.top, 0.0)
         ..scale(scaleX, scaleY, 1.0)
@@ -1684,14 +1683,14 @@ class RenderFittedBox extends RenderProxyBox {
     _updatePaintData();
     if (child != null) {
       if (_hasVisualOverflow)
-        context.pushClipRect(needsCompositing, offset, Point.origin & size, _paintChildWithTransform);
+        context.pushClipRect(needsCompositing, offset, Offset.zero & size, _paintChildWithTransform);
       else
         _paintChildWithTransform(context, offset);
     }
   }
 
   @override
-  bool hitTest(HitTestResult result, { Point position }) {
+  bool hitTest(HitTestResult result, { Offset position }) {
     _updatePaintData();
     Matrix4 inverse;
     try {
@@ -1758,10 +1757,10 @@ class RenderFractionalTranslation extends RenderProxyBox {
   bool transformHitTests;
 
   @override
-  bool hitTest(HitTestResult result, { Point position }) {
+  bool hitTest(HitTestResult result, { Offset position }) {
     assert(!debugNeedsLayout);
     if (transformHitTests)
-      position = new Point(position.x - translation.dx * size.width, position.y - translation.dy * size.height);
+      position = new Offset(position.dx - translation.dx * size.width, position.dy - translation.dy * size.height);
     return super.hitTest(result, position: position);
   }
 
@@ -1882,7 +1881,7 @@ abstract class CustomPainter {
   /// image that should be considered a "hit", false if it corresponds to a
   /// point that should be considered outside the painted image, and null to use
   /// the default behavior.
-  bool hitTest(Point position) => null;
+  bool hitTest(Offset position) => null;
 
   @override
   String toString() => '$runtimeType#$hashCode';
@@ -2024,14 +2023,14 @@ class RenderCustomPaint extends RenderProxyBox {
   }
 
   @override
-  bool hitTestChildren(HitTestResult result, { Point position }) {
+  bool hitTestChildren(HitTestResult result, { Offset position }) {
     if (_foregroundPainter != null && (_foregroundPainter.hitTest(position) ?? false))
       return true;
     return super.hitTestChildren(result, position: position);
   }
 
   @override
-  bool hitTestSelf(Point position) {
+  bool hitTestSelf(Offset position) {
     return _painter != null && (_painter.hitTest(position) ?? true);
   }
 
@@ -2361,7 +2360,7 @@ class RenderIgnorePointer extends RenderProxyBox {
   bool get _effectiveIgnoringSemantics => ignoringSemantics == null ? ignoring : ignoringSemantics;
 
   @override
-  bool hitTest(HitTestResult result, { Point position }) {
+  bool hitTest(HitTestResult result, { Offset position }) {
     return ignoring ? false : super.hitTest(result, position: position);
   }
 
@@ -2465,7 +2464,7 @@ class RenderOffstage extends RenderProxyBox {
   }
 
   @override
-  bool hitTest(HitTestResult result, { Point position }) {
+  bool hitTest(HitTestResult result, { Offset position }) {
     return !offstage && super.hitTest(result, position: position);
   }
 
@@ -2521,7 +2520,7 @@ class RenderAbsorbPointer extends RenderProxyBox {
   bool absorbing;
 
   @override
-  bool hitTest(HitTestResult result, { Point position }) {
+  bool hitTest(HitTestResult result, { Offset position }) {
     return absorbing ? true : super.hitTest(result, position: position);
   }
 
@@ -2674,7 +2673,7 @@ class RenderSemanticsGestureHandler extends RenderProxyBox implements SemanticsA
           final double primaryDelta = size.width * -scrollFactor;
           onHorizontalDragUpdate(new DragUpdateDetails(
             delta: new Offset(primaryDelta, 0.0), primaryDelta: primaryDelta,
-            globalPosition: localToGlobal(size.center(Point.origin)),
+            globalPosition: localToGlobal(size.center(Offset.zero)),
           ));
         }
         break;
@@ -2683,7 +2682,7 @@ class RenderSemanticsGestureHandler extends RenderProxyBox implements SemanticsA
           final double primaryDelta = size.width * scrollFactor;
           onHorizontalDragUpdate(new DragUpdateDetails(
             delta: new Offset(primaryDelta, 0.0), primaryDelta: primaryDelta,
-            globalPosition: localToGlobal(size.center(Point.origin)),
+            globalPosition: localToGlobal(size.center(Offset.zero)),
           ));
         }
         break;
@@ -2692,7 +2691,7 @@ class RenderSemanticsGestureHandler extends RenderProxyBox implements SemanticsA
           final double primaryDelta = size.height * -scrollFactor;
           onVerticalDragUpdate(new DragUpdateDetails(
             delta: new Offset(0.0, primaryDelta), primaryDelta: primaryDelta,
-            globalPosition: localToGlobal(size.center(Point.origin)),
+            globalPosition: localToGlobal(size.center(Offset.zero)),
           ));
         }
         break;
@@ -2701,7 +2700,7 @@ class RenderSemanticsGestureHandler extends RenderProxyBox implements SemanticsA
           final double primaryDelta = size.height * scrollFactor;
           onVerticalDragUpdate(new DragUpdateDetails(
             delta: new Offset(0.0, primaryDelta), primaryDelta: primaryDelta,
-            globalPosition: localToGlobal(size.center(Point.origin)),
+            globalPosition: localToGlobal(size.center(Offset.zero)),
           ));
         }
         break;

packages/flutter/lib/src/rendering/rotated_box.dart

@@ -90,7 +90,7 @@ class RenderRotatedBox extends RenderBox with RenderObjectWithChildMixin<RenderB
   }
 
   @override
-  bool hitTestChildren(HitTestResult result, { Point position }) {
+  bool hitTestChildren(HitTestResult result, { Offset position }) {
     assert(_paintTransform != null || debugNeedsLayout || child == null);
     if (child == null || _paintTransform == null)
       return false;

packages/flutter/lib/src/rendering/semantics.dart

@@ -716,7 +716,7 @@ class SemanticsOwner extends ChangeNotifier {
     handler?.performAction(action);
   }
 
-  SemanticsActionHandler _getSemanticsActionHandlerForPosition(SemanticsNode node, Point position, SemanticsAction action) {
+  SemanticsActionHandler _getSemanticsActionHandlerForPosition(SemanticsNode node, Offset position, SemanticsAction action) {
     if (node.transform != null) {
       final Matrix4 inverse = new Matrix4.identity();
       if (inverse.copyInverse(node.transform) == 0.0)
@@ -750,7 +750,7 @@ class SemanticsOwner extends ChangeNotifier {
   ///
   /// If the [SemanticsNode] has not indicated that it can perform the action,
   /// this function does nothing.
-  void performActionAt(Point position, SemanticsAction action) {
+  void performActionAt(Offset position, SemanticsAction action) {
     assert(action != null);
     final SemanticsNode node = rootSemanticsNode;
     if (node == null)

packages/flutter/lib/src/rendering/shifted_box.dart

@@ -70,12 +70,10 @@ abstract class RenderShiftedBox extends RenderBox with RenderObjectWithChildMixi
   }
 
   @override
-  bool hitTestChildren(HitTestResult result, { Point position }) {
+  bool hitTestChildren(HitTestResult result, { Offset position }) {
     if (child != null) {
       final BoxParentData childParentData = child.parentData;
-      final Point childPosition = new Point(position.x - childParentData.offset.dx,
+      return child.hitTest(result, position: position - childParentData.offset);
-                                            position.y - childParentData.offset.dy);
-      return child.hitTest(result, position: childPosition);
     }
     return false;
   }

packages/flutter/lib/src/rendering/sliver.dart

@@ -1014,13 +1014,13 @@ abstract class RenderSliver extends RenderObject {
     return null;
   }
 
-  void _debugDrawArrow(Canvas canvas, Paint paint, Point p0, Point p1, GrowthDirection direction) {
+  void _debugDrawArrow(Canvas canvas, Paint paint, Offset p0, Offset p1, GrowthDirection direction) {
     assert(() {
       if (p0 == p1)
         return true;
-      assert(p0.x == p1.x || p0.y == p1.y); // must be axis-aligned
+      assert(p0.dx == p1.dx || p0.dy == p1.dy); // must be axis-aligned
       final double d = (p1 - p0).distance * 0.2;
-      Point temp;
+      Offset temp;
       double dx1, dx2, dy1, dy2;
       switch (direction) {
         case GrowthDirection.forward:
@@ -1033,18 +1033,18 @@ abstract class RenderSliver extends RenderObject {
           dx1 = dx2 = dy1 = dy2 = -d;
           break;
       }
-      if (p0.x == p1.x) {
+      if (p0.dx == p1.dx) {
         dx2 = -dx2;
       } else {
         dy2 = -dy2;
       }
       canvas.drawPath(
         new Path()
-          ..moveTo(p0.x, p0.y)
+          ..moveTo(p0.dx, p0.dy)
-          ..lineTo(p1.x, p1.y)
+          ..lineTo(p1.dx, p1.dy)
-          ..moveTo(p1.x - dx1, p1.y - dy1)
+          ..moveTo(p1.dx - dx1, p1.dy - dy1)
-          ..lineTo(p1.x, p1.y)
+          ..lineTo(p1.dx, p1.dy)
-          ..lineTo(p1.x - dx2, p1.y - dy2),
+          ..lineTo(p1.dx - dx2, p1.dy - dy2),
         paint
       );
       return true;
@@ -1065,50 +1065,50 @@ abstract class RenderSliver extends RenderObject {
         final double padding = math.max(2.0, strokeWidth);
         final Canvas canvas = context.canvas;
         canvas.drawCircle(
-          offset.translate(padding, padding).toPoint(),
+          offset.translate(padding, padding),
           padding * 0.5,
           paint,
         );
         switch (constraints.axis) {
           case Axis.vertical:
             canvas.drawLine(
-              offset.toPoint(),
+              offset,
-              offset.translate(constraints.crossAxisExtent, 0.0).toPoint(),
+              offset.translate(constraints.crossAxisExtent, 0.0),
               paint,
             );
             _debugDrawArrow(
               canvas,
               paint,
-              offset.translate(constraints.crossAxisExtent * 1.0 / 4.0, padding).toPoint(),
+              offset.translate(constraints.crossAxisExtent * 1.0 / 4.0, padding),
-              offset.translate(constraints.crossAxisExtent * 1.0 / 4.0, arrowExtent - padding).toPoint(),
+              offset.translate(constraints.crossAxisExtent * 1.0 / 4.0, arrowExtent - padding),
               constraints.normalizedGrowthDirection,
             );
             _debugDrawArrow(
               canvas,
               paint,
-              offset.translate(constraints.crossAxisExtent * 3.0 / 4.0, padding).toPoint(),
+              offset.translate(constraints.crossAxisExtent * 3.0 / 4.0, padding),
-              offset.translate(constraints.crossAxisExtent * 3.0 / 4.0, arrowExtent - padding).toPoint(),
+              offset.translate(constraints.crossAxisExtent * 3.0 / 4.0, arrowExtent - padding),
               constraints.normalizedGrowthDirection,
             );
             break;
           case Axis.horizontal:
             canvas.drawLine(
-              offset.toPoint(),
+              offset,
-              offset.translate(0.0, constraints.crossAxisExtent).toPoint(),
+              offset.translate(0.0, constraints.crossAxisExtent),
               paint,
             );
             _debugDrawArrow(
               canvas,
               paint,
-              offset.translate(padding, constraints.crossAxisExtent * 1.0 / 4.0).toPoint(),
+              offset.translate(padding, constraints.crossAxisExtent * 1.0 / 4.0),
-              offset.translate(arrowExtent - padding, constraints.crossAxisExtent * 1.0 / 4.0).toPoint(),
+              offset.translate(arrowExtent - padding, constraints.crossAxisExtent * 1.0 / 4.0),
               constraints.normalizedGrowthDirection,
             );
             _debugDrawArrow(
               canvas,
               paint,
-              offset.translate(padding, constraints.crossAxisExtent * 3.0 / 4.0).toPoint(),
+              offset.translate(padding, constraints.crossAxisExtent * 3.0 / 4.0),
-              offset.translate(arrowExtent - padding, constraints.crossAxisExtent * 3.0 / 4.0).toPoint(),
+              offset.translate(arrowExtent - padding, constraints.crossAxisExtent * 3.0 / 4.0),
               constraints.normalizedGrowthDirection,
             );
             break;
@@ -1177,11 +1177,11 @@ abstract class RenderSliverHelpers implements RenderSliver {
       case Axis.horizontal:
         if (!rightWayUp)
           absolutePosition = child.size.width - absolutePosition;
-        return child.hitTest(result, position: new Point(absolutePosition, absoluteCrossAxisPosition));
+        return child.hitTest(result, position: new Offset(absolutePosition, absoluteCrossAxisPosition));
       case Axis.vertical:
         if (!rightWayUp)
           absolutePosition = child.size.height - absolutePosition;
-        return child.hitTest(result, position: new Point(absoluteCrossAxisPosition, absolutePosition));
+        return child.hitTest(result, position: new Offset(absoluteCrossAxisPosition, absolutePosition));
     }
     return false;
   }

packages/flutter/lib/src/rendering/stack.dart

@@ -420,7 +420,7 @@ class RenderStack extends RenderBox
   }
 
   @override
-  bool hitTestChildren(HitTestResult result, { Point position }) {
+  bool hitTestChildren(HitTestResult result, { Offset position }) {
     return defaultHitTestChildren(result, position: position);
   }
 
@@ -436,14 +436,14 @@ class RenderStack extends RenderBox
   @override
   void paint(PaintingContext context, Offset offset) {
     if (_overflow == Overflow.clip && _hasVisualOverflow) {
-      context.pushClipRect(needsCompositing, offset, Point.origin & size, paintStack);
+      context.pushClipRect(needsCompositing, offset, Offset.zero & size, paintStack);
     } else {
       paintStack(context, offset);
     }
   }
 
   @override
-  Rect describeApproximatePaintClip(RenderObject child) => _hasVisualOverflow ? Point.origin & size : null;
+  Rect describeApproximatePaintClip(RenderObject child) => _hasVisualOverflow ? Offset.zero & size : null;
 
   @override
   void debugFillDescription(List<String> description) {
@@ -496,15 +496,13 @@ class RenderIndexedStack extends RenderStack {
   }
 
   @override
-  bool hitTestChildren(HitTestResult result, { @required Point position }) {
+  bool hitTestChildren(HitTestResult result, { @required Offset position }) {
     if (firstChild == null || index == null)
       return false;
     assert(position != null);
     final RenderBox child = _childAtIndex();
     final StackParentData childParentData = child.parentData;
-    final Point transformed = new Point(position.x - childParentData.offset.dx,
+    return child.hitTest(result, position: position - childParentData.offset);
-                                  position.y - childParentData.offset.dy);
-    return child.hitTest(result, position: transformed);
   }
 
   @override

packages/flutter/lib/src/rendering/table.dart

@@ -1196,15 +1196,13 @@ class RenderTable extends RenderBox {
   }
 
   @override
-  bool hitTestChildren(HitTestResult result, { Point position }) {
+  bool hitTestChildren(HitTestResult result, { Offset position }) {
     assert(_children.length == rows * columns);
     for (int index = _children.length - 1; index >= 0; index -= 1) {
       final RenderBox child = _children[index];
       if (child != null) {
         final BoxParentData childParentData = child.parentData;
-        final Point transformed = new Point(position.x - childParentData.offset.dx,
+        if (child.hitTest(result, position: position - childParentData.offset))
-                                      position.y - childParentData.offset.dy);
-        if (child.hitTest(result, position: transformed))
           return true;
       }
     }

packages/flutter/lib/src/rendering/view.dart

@@ -126,7 +126,7 @@ class RenderView extends RenderObject with RenderObjectWithChildMixin<RenderBox>
   /// given hit test result.
   ///
   /// The [position] argument is in the coordinate system of the render view.
-  bool hitTest(HitTestResult result, { Point position }) {
+  bool hitTest(HitTestResult result, { Offset position }) {
     if (child != null)
       child.hitTest(result, position: position);
     result.add(new HitTestEntry(this));
@@ -164,10 +164,10 @@ class RenderView extends RenderObject with RenderObjectWithChildMixin<RenderBox>
   }
 
   @override
-  Rect get paintBounds => Point.origin & size;
+  Rect get paintBounds => Offset.zero & size;
 
   @override
-  Rect get semanticBounds => Point.origin & size;
+  Rect get semanticBounds => Offset.zero & size;
 
   @override
   void debugFillDescription(List<String> description) {

packages/flutter/lib/src/rendering/viewport.dart

@@ -223,7 +223,7 @@ abstract class RenderViewportBase<ParentDataClass extends ContainerParentDataMix
     if (firstChild == null)
       return;
     if (hasVisualOverflow) {
-      context.pushClipRect(needsCompositing, offset, Point.origin & size, _paintContents);
+      context.pushClipRect(needsCompositing, offset, Offset.zero & size, _paintContents);
     } else {
       _paintContents(context, offset);
     }
@@ -265,16 +265,16 @@ abstract class RenderViewportBase<ParentDataClass extends ContainerParentDataMix
   }
 
   @override
-  bool hitTestChildren(HitTestResult result, { Point position }) {
+  bool hitTestChildren(HitTestResult result, { Offset position }) {
     double mainAxisPosition, crossAxisPosition;
     switch (axis) {
       case Axis.vertical:
-        mainAxisPosition = position.y;
+        mainAxisPosition = position.dy;
-        crossAxisPosition = position.x;
+        crossAxisPosition = position.dx;
         break;
       case Axis.horizontal:
-        mainAxisPosition = position.x;
+        mainAxisPosition = position.dx;
-        crossAxisPosition = position.y;
+        crossAxisPosition = position.dy;
         break;
     }
     assert(mainAxisPosition != null);

packages/flutter/lib/src/rendering/wrap.dart

@@ -560,7 +560,7 @@ class RenderWrap extends RenderBox with ContainerRenderObjectMixin<RenderBox, Wr
   }
 
   @override
-  bool hitTestChildren(HitTestResult result, { Point position }) {
+  bool hitTestChildren(HitTestResult result, { Offset position }) {
     return defaultHitTestChildren(result, position: position);
   }
 
@@ -569,7 +569,7 @@ class RenderWrap extends RenderBox with ContainerRenderObjectMixin<RenderBox, Wr
     // TODO(ianh): move the debug flex overflow paint logic somewhere common so
     // it can be reused here
     if (_hasVisualOverflow)
-      context.pushClipRect(needsCompositing, offset, Point.origin & size, defaultPaint);
+      context.pushClipRect(needsCompositing, offset, Offset.zero & size, defaultPaint);
     else
       defaultPaint(context, offset);
   }

packages/flutter/lib/src/widgets/banner.dart

@@ -99,7 +99,7 @@ class BannerPainter extends CustomPainter {
       ..drawRect(_kRect, _paintBanner);
     final double width = _kOffset * 2.0;
     _textPainter.layout(minWidth: width, maxWidth: width);
-    _textPainter.paint(canvas, _kRect.topLeft.toOffset() + new Offset(0.0, (_kRect.height - _textPainter.height) / 2.0));
+    _textPainter.paint(canvas, _kRect.topLeft + new Offset(0.0, (_kRect.height - _textPainter.height) / 2.0));
   }
 
   @override
@@ -111,7 +111,7 @@ class BannerPainter extends CustomPainter {
   }
 
   @override
-  bool hitTest(Point position) => false;
+  bool hitTest(Offset position) => false;
 
   double _translationX(double width) {
     assert(location != null);

packages/flutter/lib/src/widgets/drag_target.dart

@@ -234,7 +234,7 @@ class LongPressDraggable<T> extends Draggable<T> {
   @override
   DelayedMultiDragGestureRecognizer createRecognizer(GestureMultiDragStartCallback onStart) {
     return new DelayedMultiDragGestureRecognizer()
-      ..onStart = (Point position) {
+      ..onStart = (Offset position) {
         final Drag result = onStart(position);
         if (result != null)
           HapticFeedback.vibrate();
@@ -281,17 +281,17 @@ class _DraggableState<T> extends State<Draggable<T>> {
     _recognizer.addPointer(event);
   }
 
-  _DragAvatar<T> _startDrag(Point position) {
+  _DragAvatar<T> _startDrag(Offset position) {
     if (widget.maxSimultaneousDrags != null && _activeCount >= widget.maxSimultaneousDrags)
       return null;
-    Point dragStartPoint;
+    Offset dragStartPoint;
     switch (widget.dragAnchor) {
       case DragAnchor.child:
         final RenderBox renderObject = context.findRenderObject();
         dragStartPoint = renderObject.globalToLocal(position);
         break;
       case DragAnchor.pointer:
-        dragStartPoint = Point.origin;
+        dragStartPoint = Offset.zero;
       break;
     }
     setState(() {
@@ -439,8 +439,8 @@ class _DragAvatar<T> extends Drag {
   _DragAvatar({
     @required this.overlayState,
     this.data,
-    Point initialPosition,
+    Offset initialPosition,
-    this.dragStartPoint: Point.origin,
+    this.dragStartPoint: Offset.zero,
     this.feedback,
     this.feedbackOffset: Offset.zero,
     this.onDragEnd
@@ -455,7 +455,7 @@ class _DragAvatar<T> extends Drag {
   }
 
   final T data;
-  final Point dragStartPoint;
+  final Offset dragStartPoint;
   final Widget feedback;
   final Offset feedbackOffset;
   final _OnDragEnd onDragEnd;
@@ -463,7 +463,7 @@ class _DragAvatar<T> extends Drag {
 
   _DragTargetState<T> _activeTarget;
   final List<_DragTargetState<T>> _enteredTargets = <_DragTargetState<T>>[];
-  Point _position;
+  Offset _position;
   Offset _lastOffset;
   OverlayEntry _entry;
 
@@ -483,7 +483,7 @@ class _DragAvatar<T> extends Drag {
     finishDrag(_DragEndKind.canceled);
   }
 
-  void updateDrag(Point globalPosition) {
+  void updateDrag(Offset globalPosition) {
     _lastOffset = globalPosition - dragStartPoint;
     _entry.markNeedsBuild();
     final HitTestResult result = new HitTestResult();
@@ -558,10 +558,10 @@ class _DragAvatar<T> extends Drag {
 
   Widget _build(BuildContext context) {
     final RenderBox box = overlayState.context.findRenderObject();
-    final Point overlayTopLeft = box.localToGlobal(Point.origin);
+    final Offset overlayTopLeft = box.localToGlobal(Offset.zero);
     return new Positioned(
-      left: _lastOffset.dx - overlayTopLeft.x,
+      left: _lastOffset.dx - overlayTopLeft.dx,
-      top: _lastOffset.dy - overlayTopLeft.y,
+      top: _lastOffset.dy - overlayTopLeft.dy,
       child: new IgnorePointer(
         child: feedback
       )

packages/flutter/lib/src/widgets/gridpaper.dart

@@ -27,11 +27,11 @@ class _GridPaperPainter extends CustomPainter {
     final double allDivisions = (divisions * subDivisions).toDouble();
     for (double x = 0.0; x <= size.width; x += interval / allDivisions) {
       linePaint.strokeWidth = (x % interval == 0.0) ? 1.0 : (x % (interval / subDivisions) == 0.0) ? 0.5: 0.25;
-      canvas.drawLine(new Point(x, 0.0), new Point(x, size.height), linePaint);
+      canvas.drawLine(new Offset(x, 0.0), new Offset(x, size.height), linePaint);
     }
     for (double y = 0.0; y <= size.height; y += interval / allDivisions) {
       linePaint.strokeWidth = (y % interval == 0.0) ? 1.0 : (y % (interval / subDivisions) == 0.0) ? 0.5: 0.25;
-      canvas.drawLine(new Point(0.0, y), new Point(size.width, y), linePaint);
+      canvas.drawLine(new Offset(0.0, y), new Offset(size.width, y), linePaint);
     }
   }
 
@@ -44,7 +44,7 @@ class _GridPaperPainter extends CustomPainter {
   }
 
   @override
-  bool hitTest(Point position) => false;
+  bool hitTest(Offset position) => false;
 }
 
 /// A widget that draws a rectilinear grid of 1px wide lines.

packages/flutter/lib/src/widgets/heroes.dart

@@ -31,7 +31,7 @@ enum _HeroFlightType {
 Rect _globalRect(BuildContext context) {
   final RenderBox box = context.findRenderObject();
   assert(box != null && box.hasSize);
-  return MatrixUtils.transformRect(box.getTransformTo(null), Point.origin & box.size);
+  return MatrixUtils.transformRect(box.getTransformTo(null), Offset.zero & box.size);
 }
 
 /// A widget that marks its child as being a candidate for hero animations.
@@ -250,7 +250,7 @@ class _HeroFlight {
           // The toHero has been laid out. If it's no longer where the hero animation is
           // supposed to end up (heroRect.end) then recreate the heroRect tween.
           final RenderBox routeBox = manifest.toRoute.subtreeContext?.findRenderObject();
-          final Point heroOriginEnd = toHeroBox.localToGlobal(Point.origin, ancestor: routeBox);
+          final Offset heroOriginEnd = toHeroBox.localToGlobal(Offset.zero, ancestor: routeBox);
           if (heroOriginEnd != heroRect.end.topLeft) {
             final Rect heroRectEnd = heroOriginEnd & heroRect.end.size;
             heroRect = _doCreateRectTween(heroRect.begin, heroRectEnd);

packages/flutter/lib/src/widgets/layout_builder.dart

@@ -214,7 +214,7 @@ class _RenderLayoutBuilder extends RenderBox with RenderObjectWithChildMixin<Ren
   }
 
   @override
-  bool hitTestChildren(HitTestResult result, { Point position }) {
+  bool hitTestChildren(HitTestResult result, { Offset position }) {
     return child?.hitTest(result, position: position) ?? false;
   }
 

packages/flutter/lib/src/widgets/overscroll_indicator.dart

@@ -165,13 +165,13 @@ class _GlowingOverscrollIndicatorState extends State<GlowingOverscrollIndicator>
             assert(renderer != null);
             assert(renderer.hasSize);
             final Size size = renderer.size;
-            final Point position = renderer.globalToLocal(notification.dragDetails.globalPosition);
+            final Offset position = renderer.globalToLocal(notification.dragDetails.globalPosition);
             switch (notification.axis) {
               case Axis.horizontal:
-                controller.pull(notification.overscroll.abs(), size.width, position.y.clamp(0.0, size.height), size.height);
+                controller.pull(notification.overscroll.abs(), size.width, position.dy.clamp(0.0, size.height), size.height);
                 break;
               case Axis.vertical:
-                controller.pull(notification.overscroll.abs(), size.height, position.x.clamp(0.0, size.width), size.width);
+                controller.pull(notification.overscroll.abs(), size.height, position.dx.clamp(0.0, size.width), size.width);
                 break;
             }
           }
@@ -423,7 +423,7 @@ class _GlowController extends ChangeNotifier {
     final double height = math.min(size.height, size.width * _kWidthToHeightFactor);
     final double scaleY = _glowSize.value * baseGlowScale;
     final Rect rect = new Rect.fromLTWH(0.0, 0.0, size.width, height);
-    final Point center = new Point((size.width / 2.0) * (0.5 + _displacement), height - radius);
+    final Offset center = new Offset((size.width / 2.0) * (0.5 + _displacement), height - radius);
     final Paint paint = new Paint()..color = color.withOpacity(_glowOpacity.value);
     canvas.save();
     canvas.scale(1.0, scaleY);

packages/flutter/lib/src/widgets/semantics_debugger.dart

@@ -68,7 +68,7 @@ class _SemanticsDebuggerState extends State<SemanticsDebugger> {
     });
   }
 
-  Point _lastPointerDownLocation;
+  Offset _lastPointerDownLocation;
   void _handlePointerDown(PointerDownEvent event) {
     setState(() {
       _lastPointerDownLocation = event.position;
@@ -115,7 +115,7 @@ class _SemanticsDebuggerState extends State<SemanticsDebugger> {
     });
   }
 
-  void _performAction(Point position, SemanticsAction action) {
+  void _performAction(Offset position, SemanticsAction action) {
     _pipelineOwner.semanticsOwner?.performActionAt(position, action);
   }
 
@@ -241,7 +241,7 @@ void _paintMessage(Canvas canvas, SemanticsNode node) {
     ..text = new TextSpan(style: _messageStyle, text: message)
     ..layout(maxWidth: rect.width);
 
-  textPainter.paint(canvas, FractionalOffset.center.inscribe(textPainter.size, rect).topLeft.toOffset());
+  textPainter.paint(canvas, FractionalOffset.center.inscribe(textPainter.size, rect).topLeft);
   canvas.restore();
 }
 
@@ -297,7 +297,7 @@ class _SemanticsDebuggerPainter extends CustomPainter {
 
   final PipelineOwner owner;
   final int generation;
-  final Point pointerPosition;
+  final Offset pointerPosition;
 
   SemanticsNode get _rootSemanticsNode {
     return owner.semanticsOwner?.rootSemanticsNode;

packages/flutter/lib/src/widgets/single_child_scroll_view.dart

@@ -351,7 +351,7 @@ class _RenderSingleChildViewport extends RenderBox with RenderObjectWithChildMix
       }
 
       if (_shouldClipAtPaintOffset(paintOffset)) {
-        context.pushClipRect(needsCompositing, offset, Point.origin & size, paintContents);
+        context.pushClipRect(needsCompositing, offset, Offset.zero & size, paintContents);
       } else {
         paintContents(context, offset);
       }
@@ -367,14 +367,14 @@ class _RenderSingleChildViewport extends RenderBox with RenderObjectWithChildMix
   @override
   Rect describeApproximatePaintClip(RenderObject child) {
     if (child != null && _shouldClipAtPaintOffset(_paintOffset))
-      return Point.origin & size;
+      return Offset.zero & size;
     return null;
   }
 
   @override
-  bool hitTestChildren(HitTestResult result, { Point position }) {
+  bool hitTestChildren(HitTestResult result, { Offset position }) {
     if (child != null) {
-      final Point transformed = position + -_paintOffset;
+      final Offset transformed = position + -_paintOffset;
       return child.hitTest(result, position: transformed);
     }
     return false;

packages/flutter/lib/src/widgets/text_selection.dart

@@ -74,7 +74,7 @@ abstract class TextSelectionControls {
   ///
   /// Typically displays buttons for copying and pasting text.
   // TODO(mpcomplete): A single position is probably insufficient.
-  Widget buildToolbar(BuildContext context, Point position, TextSelectionDelegate delegate);
+  Widget buildToolbar(BuildContext context, Offset position, TextSelectionDelegate delegate);
 
   /// Returns the size of the selection handle.
   Size get handleSize;
@@ -237,11 +237,11 @@ class TextSelectionOverlay implements TextSelectionDelegate {
 
     // Find the horizontal midpoint, just above the selected text.
     final List<TextSelectionPoint> endpoints = renderObject.getEndpointsForSelection(_selection);
-    final Point midpoint = new Point(
+    final Offset midpoint = new Offset(
       (endpoints.length == 1) ?
-        endpoints[0].point.x :
+        endpoints[0].point.dx :
-        (endpoints[0].point.x + endpoints[1].point.x) / 2.0,
+        (endpoints[0].point.dx + endpoints[1].point.dx) / 2.0,
-      endpoints[0].point.y - renderObject.size.height
+      endpoints[0].point.dy - renderObject.size.height
     );
 
     return new FadeTransition(
@@ -318,7 +318,7 @@ class _TextSelectionHandleOverlay extends StatefulWidget {
 }
 
 class _TextSelectionHandleOverlayState extends State<_TextSelectionHandleOverlay> {
-  Point _dragPosition;
+  Offset _dragPosition;
 
   void _handleDragStart(DragStartDetails details) {
     _dragPosition = details.globalPosition + new Offset(0.0, -widget.selectionControls.handleSize.height);
@@ -362,7 +362,7 @@ class _TextSelectionHandleOverlayState extends State<_TextSelectionHandleOverlay
   @override
   Widget build(BuildContext context) {
     final List<TextSelectionPoint> endpoints = widget.renderObject.getEndpointsForSelection(widget.selection);
-    Point point;
+    Offset point;
     TextSelectionHandleType type;
 
     switch (widget.position) {
@@ -386,8 +386,8 @@ class _TextSelectionHandleOverlayState extends State<_TextSelectionHandleOverlay
       child: new Stack(
         children: <Widget>[
           new Positioned(
-            left: point.x,
+            left: point.dx,
-            top: point.y,
+            top: point.dy,
             child: widget.selectionControls.buildHandle(context, type)
           )
         ]

packages/flutter/test/cupertino/button_test.dart

@@ -133,7 +133,7 @@ void main() {
     )));
 
     // Keep a "down" gesture on the button
-    final Point center = tester.getCenter(find.byType(CupertinoButton));
+    final Offset center = tester.getCenter(find.byType(CupertinoButton));
     await tester.startGesture(center);
     await tester.pumpAndSettle();
 
@@ -154,7 +154,7 @@ void main() {
     )));
 
     // Keep a "down" gesture on the button
-    final Point center = tester.getCenter(find.byType(CupertinoButton));
+    final Offset center = tester.getCenter(find.byType(CupertinoButton));
     await tester.startGesture(center);
     await tester.pumpAndSettle();
 

packages/flutter/test/cupertino/slider_test.dart

@@ -66,7 +66,7 @@ void main() {
     );
 
     expect(value, equals(0.0));
-    final Point topLeft = tester.getTopLeft(find.byKey(sliderKey));
+    final Offset topLeft = tester.getTopLeft(find.byKey(sliderKey));
     const double unit = CupertinoThumbPainter.radius;
     const double delta = 3.0 * unit;
     await tester.dragFrom(topLeft + const Offset(unit, unit), const Offset(delta, 0.0));

packages/flutter/test/gestures/double_tap_test.dart

@@ -29,61 +29,61 @@ void main() {
   // Down/up pair 1: normal tap sequence
   const PointerDownEvent down1 = const PointerDownEvent(
     pointer: 1,
-    position: const Point(10.0, 10.0)
+    position: const Offset(10.0, 10.0)
   );
 
   const PointerUpEvent up1 = const PointerUpEvent(
     pointer: 1,
-    position: const Point(11.0, 9.0)
+    position: const Offset(11.0, 9.0)
   );
 
   // Down/up pair 2: normal tap sequence close to pair 1
   const PointerDownEvent down2 = const PointerDownEvent(
     pointer: 2,
-    position: const Point(12.0, 12.0)
+    position: const Offset(12.0, 12.0)
   );
 
   const PointerUpEvent up2 = const PointerUpEvent(
     pointer: 2,
-    position: const Point(13.0, 11.0)
+    position: const Offset(13.0, 11.0)
   );
 
   // Down/up pair 3: normal tap sequence far away from pair 1
   const PointerDownEvent down3 = const PointerDownEvent(
     pointer: 3,
-    position: const Point(130.0, 130.0)
+    position: const Offset(130.0, 130.0)
   );
 
   const PointerUpEvent up3 = const PointerUpEvent(
     pointer: 3,
-    position: const Point(131.0, 129.0)
+    position: const Offset(131.0, 129.0)
   );
 
   // Down/move/up sequence 4: intervening motion
   const PointerDownEvent down4 = const PointerDownEvent(
     pointer: 4,
-    position: const Point(10.0, 10.0)
+    position: const Offset(10.0, 10.0)
   );
 
   const PointerMoveEvent move4 = const PointerMoveEvent(
     pointer: 4,
-    position: const Point(25.0, 25.0)
+    position: const Offset(25.0, 25.0)
   );
 
   const PointerUpEvent up4 = const PointerUpEvent(
     pointer: 4,
-    position: const Point(25.0, 25.0)
+    position: const Offset(25.0, 25.0)
   );
 
   // Down/up pair 5: normal tap sequence identical to pair 1 with different pointer
   const PointerDownEvent down5 = const PointerDownEvent(
     pointer: 5,
-    position: const Point(10.0, 10.0)
+    position: const Offset(10.0, 10.0)
   );
 
   const PointerUpEvent up5 = const PointerUpEvent(
     pointer: 5,
-    position: const Point(11.0, 9.0)
+    position: const Offset(11.0, 9.0)
   );
 
   testGesture('Should recognize double tap', (GestureTester tester) {

packages/flutter/test/gestures/drag_test.dart

@@ -35,7 +35,7 @@ void main() {
     };
 
     final TestPointer pointer = new TestPointer(5);
-    final PointerDownEvent down = pointer.down(const Point(10.0, 10.0));
+    final PointerDownEvent down = pointer.down(const Offset(10.0, 10.0));
     pan.addPointer(down);
     tap.addPointer(down);
     tester.closeArena(5);
@@ -50,7 +50,7 @@ void main() {
     expect(didEndPan, isFalse);
     expect(didTap, isFalse);
 
-    tester.route(pointer.move(const Point(20.0, 20.0)));
+    tester.route(pointer.move(const Offset(20.0, 20.0)));
     expect(didStartPan, isTrue);
     didStartPan = false;
     expect(updatedScrollDelta, const Offset(10.0, 10.0));
@@ -58,7 +58,7 @@ void main() {
     expect(didEndPan, isFalse);
     expect(didTap, isFalse);
 
-    tester.route(pointer.move(const Point(20.0, 25.0)));
+    tester.route(pointer.move(const Offset(20.0, 25.0)));
     expect(didStartPan, isFalse);
     expect(updatedScrollDelta, const Offset(0.0, 5.0));
     updatedScrollDelta = null;
@@ -95,7 +95,7 @@ void main() {
     };
 
     final TestPointer pointer = new TestPointer(5);
-    final PointerDownEvent down = pointer.down(const Point(10.0, 10.0));
+    final PointerDownEvent down = pointer.down(const Offset(10.0, 10.0));
     drag.addPointer(down);
     tester.closeArena(5);
     expect(didStartDrag, isFalse);
@@ -107,14 +107,14 @@ void main() {
     expect(updatedDelta, isNull);
     expect(didEndDrag, isFalse);
 
-    tester.route(pointer.move(const Point(20.0, 25.0)));
+    tester.route(pointer.move(const Offset(20.0, 25.0)));
     expect(didStartDrag, isTrue);
     didStartDrag = false;
     expect(updatedDelta, 10.0);
     updatedDelta = null;
     expect(didEndDrag, isFalse);
 
-    tester.route(pointer.move(const Point(20.0, 25.0)));
+    tester.route(pointer.move(const Offset(20.0, 25.0)));
     expect(didStartDrag, isFalse);
     expect(updatedDelta, 0.0);
     updatedDelta = null;
@@ -140,21 +140,21 @@ void main() {
     };
 
     final TestPointer pointer = new TestPointer(5);
-    final PointerDownEvent down = pointer.down(const Point(10.0, 25.0), timeStamp: const Duration(milliseconds: 10));
+    final PointerDownEvent down = pointer.down(const Offset(10.0, 25.0), timeStamp: const Duration(milliseconds: 10));
     drag.addPointer(down);
     tester.closeArena(5);
     tester.route(down);
-    tester.route(pointer.move(const Point(20.0, 25.0), timeStamp: const Duration(milliseconds: 10)));
+    tester.route(pointer.move(const Offset(20.0, 25.0), timeStamp: const Duration(milliseconds: 10)));
-    tester.route(pointer.move(const Point(30.0, 25.0), timeStamp: const Duration(milliseconds: 11)));
+    tester.route(pointer.move(const Offset(30.0, 25.0), timeStamp: const Duration(milliseconds: 11)));
-    tester.route(pointer.move(const Point(40.0, 25.0), timeStamp: const Duration(milliseconds: 12)));
+    tester.route(pointer.move(const Offset(40.0, 25.0), timeStamp: const Duration(milliseconds: 12)));
-    tester.route(pointer.move(const Point(50.0, 25.0), timeStamp: const Duration(milliseconds: 13)));
+    tester.route(pointer.move(const Offset(50.0, 25.0), timeStamp: const Duration(milliseconds: 13)));
-    tester.route(pointer.move(const Point(60.0, 25.0), timeStamp: const Duration(milliseconds: 14)));
+    tester.route(pointer.move(const Offset(60.0, 25.0), timeStamp: const Duration(milliseconds: 14)));
-    tester.route(pointer.move(const Point(70.0, 25.0), timeStamp: const Duration(milliseconds: 15)));
+    tester.route(pointer.move(const Offset(70.0, 25.0), timeStamp: const Duration(milliseconds: 15)));
-    tester.route(pointer.move(const Point(80.0, 25.0), timeStamp: const Duration(milliseconds: 16)));
+    tester.route(pointer.move(const Offset(80.0, 25.0), timeStamp: const Duration(milliseconds: 16)));
-    tester.route(pointer.move(const Point(90.0, 25.0), timeStamp: const Duration(milliseconds: 17)));
+    tester.route(pointer.move(const Offset(90.0, 25.0), timeStamp: const Duration(milliseconds: 17)));
-    tester.route(pointer.move(const Point(100.0, 25.0), timeStamp: const Duration(milliseconds: 18)));
+    tester.route(pointer.move(const Offset(100.0, 25.0), timeStamp: const Duration(milliseconds: 18)));
-    tester.route(pointer.move(const Point(110.0, 25.0), timeStamp: const Duration(milliseconds: 19)));
+    tester.route(pointer.move(const Offset(110.0, 25.0), timeStamp: const Duration(milliseconds: 19)));
-    tester.route(pointer.move(const Point(120.0, 25.0), timeStamp: const Duration(milliseconds: 20)));
+    tester.route(pointer.move(const Offset(120.0, 25.0), timeStamp: const Duration(milliseconds: 20)));
     tester.route(pointer.up(timeStamp: const Duration(milliseconds: 20)));
     expect(velocity.pixelsPerSecond.dx, inInclusiveRange(0.99 * kMaxFlingVelocity, kMaxFlingVelocity));
     expect(velocity.pixelsPerSecond.dy, moreOrLessEquals(0.0));
@@ -166,7 +166,7 @@ void main() {
   testGesture('Drag details', (GestureTester tester) {
     expect(new DragDownDetails(), hasOneLineDescription);
     expect(new DragStartDetails(), hasOneLineDescription);
-    expect(new DragUpdateDetails(globalPosition: Point.origin), hasOneLineDescription);
+    expect(new DragUpdateDetails(globalPosition: Offset.zero), hasOneLineDescription);
     expect(new DragEndDetails(), hasOneLineDescription);
   });
 }

packages/flutter/test/gestures/long_press_test.dart

@@ -9,12 +9,12 @@ import 'gesture_tester.dart';
 
 const PointerDownEvent down = const PointerDownEvent(
   pointer: 5,
-  position: const Point(10.0, 10.0)
+  position: const Offset(10.0, 10.0)
 );
 
 const PointerUpEvent up = const PointerUpEvent(
   pointer: 5,
-  position: const Point(11.0, 9.0)
+  position: const Offset(11.0, 9.0)
 );
 
 void main() {

packages/flutter/test/gestures/multidrag_test.dart

@@ -17,23 +17,23 @@ void main() {
     final DelayedMultiDragGestureRecognizer drag = new DelayedMultiDragGestureRecognizer();
 
     bool didStartDrag = false;
-    drag.onStart = (Point position) {
+    drag.onStart = (Offset position) {
       didStartDrag = true;
       return new TestDrag();
     };
 
     final TestPointer pointer = new TestPointer(5);
-    final PointerDownEvent down = pointer.down(const Point(10.0, 10.0));
+    final PointerDownEvent down = pointer.down(const Offset(10.0, 10.0));
     drag.addPointer(down);
     tester.closeArena(5);
     expect(didStartDrag, isFalse);
     tester.async.flushMicrotasks();
     expect(didStartDrag, isFalse);
-    tester.route(pointer.move(const Point(20.0, 20.0)));
+    tester.route(pointer.move(const Offset(20.0, 20.0)));
     expect(didStartDrag, isFalse);
     tester.async.elapse(kLongPressTimeout * 2);
     expect(didStartDrag, isFalse);
-    tester.route(pointer.move(const Point(30.0, 30.0)));
+    tester.route(pointer.move(const Offset(30.0, 30.0)));
     expect(didStartDrag, isFalse);
     drag.dispose();
   });

packages/flutter/test/gestures/multitap_test.dart

@@ -26,7 +26,7 @@ void main() {
 
 
     final TestPointer pointer5 = new TestPointer(5);
-    final PointerDownEvent down5 = pointer5.down(const Point(10.0, 10.0));
+    final PointerDownEvent down5 = pointer5.down(const Offset(10.0, 10.0));
     tap.addPointer(down5);
     tester.closeArena(5);
     expect(log, <String>['tap-down 5']);
@@ -35,7 +35,7 @@ void main() {
     expect(log, isEmpty);
 
     final TestPointer pointer6 = new TestPointer(6);
-    final PointerDownEvent down6 = pointer6.down(const Point(15.0, 15.0));
+    final PointerDownEvent down6 = pointer6.down(const Offset(15.0, 15.0));
     tap.addPointer(down6);
     tester.closeArena(6);
     expect(log, <String>['tap-down 6']);
@@ -43,10 +43,10 @@ void main() {
     tester.route(down6);
     expect(log, isEmpty);
 
-    tester.route(pointer5.move(const Point(11.0, 12.0)));
+    tester.route(pointer5.move(const Offset(11.0, 12.0)));
     expect(log, isEmpty);
 
-    tester.route(pointer6.move(const Point(14.0, 13.0)));
+    tester.route(pointer6.move(const Offset(14.0, 13.0)));
     expect(log, isEmpty);
 
     tester.route(pointer5.up());
@@ -60,7 +60,7 @@ void main() {
     expect(log, <String>['long-tap-down 6']);
     log.clear();
 
-    tester.route(pointer6.move(const Point(4.0, 3.0)));
+    tester.route(pointer6.move(const Offset(4.0, 3.0)));
     expect(log, <String>['tap-cancel 6']);
     log.clear();