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69 lines
2.5 KiB
Dart
69 lines
2.5 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:math' as math;
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import 'dart:ui' as ui;
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import 'dart:typed_data';
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Duration timeBase = null;
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ui.Paragraph paragraph;
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ui.Picture paint(ui.Rect paintBounds, double delta) {
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ui.PictureRecorder recorder = new ui.PictureRecorder();
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ui.Canvas canvas = new ui.Canvas(recorder, paintBounds);
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canvas.translate(ui.window.size.width / 2.0, ui.window.size.height / 2.0);
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canvas.rotate(math.PI * delta / 1800);
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canvas.drawRect(new ui.Rect.fromLTRB(-100.0, -100.0, 100.0, 100.0),
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new ui.Paint()..color = const ui.Color.fromARGB(255, 0, 255, 0));
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double sin = math.sin(delta / 200);
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paragraph.maxWidth = 150.0 + (50 * sin);
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paragraph.layout();
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canvas.translate(paragraph.maxWidth / -2.0, (paragraph.maxWidth / 2.0) - 125);
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paragraph.paint(canvas, ui.Offset.zero);
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return recorder.endRecording();
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}
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ui.Scene composite(ui.Picture picture, ui.Rect paintBounds) {
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final double devicePixelRatio = ui.window.devicePixelRatio;
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ui.Rect sceneBounds = new ui.Rect.fromLTWH(0.0, 0.0, ui.window.size.width * devicePixelRatio, ui.window.size.height * devicePixelRatio);
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Float64List deviceTransform = new Float64List(16)
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..[0] = devicePixelRatio
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..[5] = devicePixelRatio
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..[10] = 1.0
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..[15] = 1.0;
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ui.SceneBuilder sceneBuilder = new ui.SceneBuilder(sceneBounds)
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..pushTransform(deviceTransform)
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..addPicture(ui.Offset.zero, picture)
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..pop();
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return sceneBuilder.build();
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}
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void beginFrame(Duration timeStamp) {
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if (timeBase == null)
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timeBase = timeStamp;
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double delta = (timeStamp - timeBase).inMicroseconds / Duration.MICROSECONDS_PER_MILLISECOND;
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ui.Rect paintBounds = ui.Point.origin & ui.window.size;
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ui.Picture picture = paint(paintBounds, delta);
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ui.Scene scene = composite(picture, paintBounds);
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ui.window.render(scene);
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ui.window.scheduleFrame();
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}
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void main() {
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// TODO(abarth): We're missing some bidi style information:
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// block.style['direction'] = 'rtl';
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// block.style['unicode-bidi'] = 'plaintext';
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ui.ParagraphBuilder builder = new ui.ParagraphBuilder();
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builder.addText("هذا هو قليلا طويلة من النص الذي يجب التفاف .");
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builder.addText(" و أكثر قليلا لجعله أطول. ");
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paragraph = builder.build(new ui.ParagraphStyle());
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ui.window.onBeginFrame = beginFrame;
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ui.window.scheduleFrame();
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}
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