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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' as sky; | 5 import 'dart:sky' as sky; |
6 import 'dart:math' as math; | 6 import 'dart:math' as math; |
7 | 7 |
8 import 'package:sky/base/scheduler.dart'; | 8 import 'package:sky/base/scheduler.dart'; |
9 import 'package:sky/rendering/box.dart'; | 9 import 'package:sky/rendering/box.dart'; |
10 import 'package:sky/rendering/flex.dart'; | 10 import 'package:sky/rendering/flex.dart'; |
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41 void rotate(double timeStamp) { | 41 void rotate(double timeStamp) { |
42 if (timeBase == null) | 42 if (timeBase == null) |
43 timeBase = timeStamp; | 43 timeBase = timeStamp; |
44 double delta = (timeStamp - timeBase) / 1000; // radians | 44 double delta = (timeStamp - timeBase) / 1000; // radians |
45 | 45 |
46 transformBox.setIdentity(); | 46 transformBox.setIdentity(); |
47 transformBox.translate(transformBox.size.width / 2.0, transformBox.size.height
/ 2.0); | 47 transformBox.translate(transformBox.size.width / 2.0, transformBox.size.height
/ 2.0); |
48 transformBox.rotateZ(delta); | 48 transformBox.rotateZ(delta); |
49 transformBox.translate(-transformBox.size.width / 2.0, -transformBox.size.heig
ht / 2.0); | 49 transformBox.translate(-transformBox.size.width / 2.0, -transformBox.size.heig
ht / 2.0); |
50 } | 50 } |
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