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1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 /** | 5 /** |
6 * A solar system visualization. | 6 * A solar system visualization. |
7 */ | 7 */ |
8 | 8 |
9 library solar; | 9 library solar; |
10 | 10 |
| 11 import 'dart:async'; |
11 import 'dart:html'; | 12 import 'dart:html'; |
12 import 'dart:math'; | 13 import 'dart:math'; |
13 | 14 |
14 void main() { | 15 void main() { |
15 CanvasElement canvas = query("#area"); | 16 CanvasElement canvas = query("#area"); |
16 window.setImmediate(new SolarSystem(canvas).start); | 17 scheduleMicrotask(new SolarSystem(canvas).start); |
17 } | 18 } |
18 | 19 |
19 Element notes = query("#fps"); | 20 Element notes = query("#fps"); |
20 num fpsAverage; | 21 num fpsAverage; |
21 | 22 |
22 /// Display the animation's FPS in a div. | 23 /// Display the animation's FPS in a div. |
23 void showFps(num fps) { | 24 void showFps(num fps) { |
24 if (fpsAverage == null) fpsAverage = fps; | 25 if (fpsAverage == null) fpsAverage = fps; |
25 fpsAverage = fps * 0.05 + fpsAverage * 0.95; | 26 fpsAverage = fps * 0.05 + fpsAverage * 0.95; |
26 notes.text = "${fpsAverage.round()} fps"; | 27 notes.text = "${fpsAverage.round()} fps"; |
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196 num calculateSpeed(num period) => | 197 num calculateSpeed(num period) => |
197 period == 0.0 ? 0.0 : 1 / (60.0 * 24.0 * 2 * period); | 198 period == 0.0 ? 0.0 : 1 / (60.0 * 24.0 * 2 * period); |
198 | 199 |
199 Point calculatePos(Point p) { | 200 Point calculatePos(Point p) { |
200 if (orbitSpeed == 0.0) return p; | 201 if (orbitSpeed == 0.0) return p; |
201 num angle = solarSystem.renderTime * orbitSpeed; | 202 num angle = solarSystem.renderTime * orbitSpeed; |
202 return new Point(orbitRadius * cos(angle) + p.x, | 203 return new Point(orbitRadius * cos(angle) + p.x, |
203 orbitRadius * sin(angle) + p.y); | 204 orbitRadius * sin(angle) + p.y); |
204 } | 205 } |
205 } | 206 } |
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