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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 library animation_mechanics; | |
6 | |
7 import 'dart:math' as math; | 5 import 'dart:math' as math; |
8 | 6 |
9 const double kGravity = -0.980; // m^s-2 | 7 const double kGravity = -0.980; // m^s-2 |
10 | 8 |
11 abstract class System { | 9 abstract class System { |
12 void update(double deltaT); | 10 void update(double deltaT); |
13 } | 11 } |
14 | 12 |
15 class Particle extends System { | 13 class Particle extends System { |
16 final double mass; | 14 final double mass; |
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206 | 204 |
207 void update(double deltaT) { | 205 void update(double deltaT) { |
208 _currentSystem.update(deltaT); | 206 _currentSystem.update(deltaT); |
209 } | 207 } |
210 | 208 |
211 void transitionToSystem(System system) { | 209 void transitionToSystem(System system) { |
212 assert(system != null); | 210 assert(system != null); |
213 _currentSystem = system; | 211 _currentSystem = system; |
214 } | 212 } |
215 } | 213 } |
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