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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 'curves.dart'; | 5 import 'curves.dart'; |
6 import 'dart:async'; | 6 import 'dart:async'; |
7 import 'dart:math' as math; | 7 import 'dart:math' as math; |
8 import 'dart:sky' as sky; | 8 import 'dart:sky' as sky; |
9 import 'mechanics.dart'; | 9 import 'mechanics.dart'; |
10 | 10 |
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152 double _update(double timeStamp) { | 152 double _update(double timeStamp) { |
153 double previousTime = _previousTime; | 153 double previousTime = _previousTime; |
154 _previousTime = timeStamp; | 154 _previousTime = timeStamp; |
155 if (previousTime == 0.0) | 155 if (previousTime == 0.0) |
156 return timeStamp; | 156 return timeStamp; |
157 double deltaT = timeStamp - previousTime; | 157 double deltaT = timeStamp - previousTime; |
158 system.update(deltaT); | 158 system.update(deltaT); |
159 return timeStamp; | 159 return timeStamp; |
160 } | 160 } |
161 } | 161 } |
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