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db191e96bd
This patch prepares us to switch to using integers when handing off the animation time from the engine to the framework.
47 lines
1.6 KiB
Dart
47 lines
1.6 KiB
Dart
// Copyright 2015 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'dart:sky' as sky;
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import 'package:sky/animation.dart';
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import 'package:sky/rendering.dart';
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import 'solid_color_box.dart';
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Duration timeBase;
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RenderTransform transformBox;
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void main() {
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RenderFlex flexRoot = new RenderFlex(direction: FlexDirection.vertical);
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void addFlexChildSolidColor(RenderFlex parent, sky.Color backgroundColor, { int flex: 0 }) {
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RenderSolidColorBox child = new RenderSolidColorBox(backgroundColor);
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parent.add(child);
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child.parentData.flex = flex;
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}
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addFlexChildSolidColor(flexRoot, const sky.Color(0xFFFF00FF), flex: 1);
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addFlexChildSolidColor(flexRoot, const sky.Color(0xFFFFFF00), flex: 2);
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addFlexChildSolidColor(flexRoot, const sky.Color(0xFF00FFFF), flex: 1);
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transformBox = new RenderTransform(child: flexRoot, transform: new Matrix4.identity());
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RenderPadding root = new RenderPadding(padding: new EdgeDims.all(20.0), child: transformBox);
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new FlutterBinding(root: root);
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scheduler.addPersistentFrameCallback(rotate);
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}
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void rotate(Duration timeStamp) {
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if (timeBase == null)
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timeBase = timeStamp;
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double delta = (timeStamp - timeBase).inMicroseconds.toDouble() / Duration.MICROSECONDS_PER_SECOND; // radians
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transformBox.setIdentity();
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transformBox.translate(transformBox.size.width / 2.0, transformBox.size.height / 2.0);
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transformBox.rotateZ(delta);
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transformBox.translate(-transformBox.size.width / 2.0, -transformBox.size.height / 2.0);
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}
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