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1 // Copyright 2015 The Chromium Authors. All rights reserved. | 1 // Copyright 2015 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 import 'dart:sky'; | 5 import 'dart:sky'; |
6 | 6 |
7 double timeBase = null; | 7 double timeBase = null; |
8 | 8 |
9 void beginFrame(double timeStamp) { | 9 void beginFrame(double timeStamp) { |
10 if (timeBase == null) | 10 if (timeBase == null) |
11 timeBase = timeStamp; | 11 timeBase = timeStamp; |
12 double delta = timeStamp - timeBase; | 12 double delta = timeStamp - timeBase; |
13 PictureRecorder canvas = new PictureRecorder(view.width, view.height); | 13 PictureRecorder canvas = new PictureRecorder(view.width, view.height); |
14 canvas.translate(view.width / 2.0, view.height / 2.0); | 14 canvas.translate(view.width / 2.0, view.height / 2.0); |
15 canvas.rotateDegrees(delta / 10); | 15 canvas.rotateDegrees(delta / 10); |
16 canvas.drawRect(new Rect()..setLTRB(-100.0, -100.0, 100.0, 100.0), | 16 canvas.drawRect(new Rect.fromLTRB(-100.0, -100.0, 100.0, 100.0), |
17 new Paint()..setARGB(255, 0, 255, 0)); | 17 new Paint()..setARGB(255, 0, 255, 0)); |
18 view.picture = canvas.endRecording(); | 18 view.picture = canvas.endRecording(); |
19 view.scheduleFrame(); | 19 view.scheduleFrame(); |
20 } | 20 } |
21 | 21 |
22 void main() { | 22 void main() { |
23 view.setBeginFrameCallback(beginFrame); | 23 view.setBeginFrameCallback(beginFrame); |
24 view.scheduleFrame(); | 24 view.scheduleFrame(); |
25 } | 25 } |
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