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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:async'; | 5 import 'dart:async'; |
6 import 'dart:math' as math; | 6 import 'dart:math' as math; |
7 | 7 |
8 import '../app/scheduler.dart' as scheduler; | 8 import '../base/scheduler.dart' as scheduler; |
9 import 'curves.dart'; | 9 import 'curves.dart'; |
10 import 'mechanics.dart'; | 10 import 'mechanics.dart'; |
11 | 11 |
12 abstract class Generator { | 12 abstract class Generator { |
13 Stream<double> get onTick; // TODO(ianh): rename this to tickStream | 13 Stream<double> get onTick; // TODO(ianh): rename this to tickStream |
14 void cancel(); | 14 void cancel(); |
15 } | 15 } |
16 | 16 |
17 class FrameGenerator extends Generator { | 17 class FrameGenerator extends Generator { |
18 Function onDone; | 18 Function onDone; |
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153 double _update(double timeStamp) { | 153 double _update(double timeStamp) { |
154 double previousTime = _previousTime; | 154 double previousTime = _previousTime; |
155 _previousTime = timeStamp; | 155 _previousTime = timeStamp; |
156 if (previousTime == 0.0) | 156 if (previousTime == 0.0) |
157 return timeStamp; | 157 return timeStamp; |
158 double deltaT = timeStamp - previousTime; | 158 double deltaT = timeStamp - previousTime; |
159 system.update(deltaT); | 159 system.update(deltaT); |
160 return timeStamp; | 160 return timeStamp; |
161 } | 161 } |
162 } | 162 } |
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