57 lines
1.4 KiB
Dart
57 lines
1.4 KiB
Dart
import 'dart:html';
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import 'package:browserloop/game/Game.dart';
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import 'package:browserloop/game/LoopExample.dart';
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class DirtyFlagRender implements LoopExample {
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static final double MS_PER_UPDATE = 1000.0;
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static final double SAFE_GUARD = 500.0;
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Stopwatch elapsed = new Stopwatch();
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double lag = 0.0;
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Game game;
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num id;
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bool dirty = true;
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DirtyFlagRender(this.game) {
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elapsed.start();
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window.requestAnimationFrame(eventloop);
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}
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void eventloop(num time) {
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lag += elapsed.elapsedMilliseconds;
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elapsed.reset();
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while (lag >= MS_PER_UPDATE && elapsed.elapsedMilliseconds < SAFE_GUARD) {
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update();
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lag -= MS_PER_UPDATE;
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}
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if(dirty) render(lag / MS_PER_UPDATE);
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id = window.requestAnimationFrame(eventloop);
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}
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void update() {
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game.update();
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// This is for demonstration purposes. It will set the dirty flag once every
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// update. Usually should be set this deeper in the individual logic units
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// where a change happens and moved through the program from there.
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dirty = true;
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}
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void render(double interp) {
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game.draw(interp);
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dirty = false;
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}
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// Starting and stopping the loop for the example page
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void stop() {
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elapsed.stop();
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window.cancelAnimationFrame(id);
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}
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void start() {
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elapsed.start();
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elapsed.reset();
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window.requestAnimationFrame(eventloop);
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}
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} |