70 lines
1.7 KiB
Dart
70 lines
1.7 KiB
Dart
import 'dart:html' as html;
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import 'package:rules_of_living/Cell.dart';
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import 'package:rules_of_living/Grid.dart';
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class App {
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// Elapsed Time Counter - useful for Safety Timeout
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Stopwatch _elapsed = new Stopwatch();
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// Game Tick Rate - *does* impact game speed
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final int _MS_PER_STEP = 1000 ~/ 1;
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// Max Frame (i.e. Rendering) rate - does *not* impact game speed
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final int _MS_PER_FRAME = 1000 ~/ 1;
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// ms stuck in updateloop after which game will declare itself unresponsive
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final int SAFETY_TIMEOUT = 1000;
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num _updateLag = 0.0;
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num _drawLag = 0.0;
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final html.CanvasElement canvas;
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final Grid grid = new Grid(20,20);
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final List<List<Cell>> map = new Grid(20, 20).map;
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App(this.canvas);
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void process(num now) {
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_drawLag = now;
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_updateLag += _drawLag;
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_elapsed.reset();
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while (_updateLag >= _MS_PER_STEP) {
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if (_elapsed.elapsedMilliseconds > SAFETY_TIMEOUT) {
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// TODO stub - give warning etc when this occurs
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break;
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}
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update();
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_updateLag -= _MS_PER_STEP;
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}
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if (_drawLag >= _MS_PER_FRAME) {
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render(_updateLag / _MS_PER_STEP);
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_drawLag = 0;
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}
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}
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void update() {
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grid.update();
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}
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void render([num interp]) {
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html.CanvasRenderingContext2D ctx = canvas.getContext('2d');
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int brickW = (canvas.width ~/ map[0].length);
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int brickH = (canvas.height ~/ map.length);
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ctx.clearRect(0, 0, canvas.width, canvas.height);
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for (int y = 0; y < map.length; y++) {
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for (int x = 0; x < map[y].length; x++) {
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Cell c = map[y][x];
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if (c.state == true)
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ctx.setFillColorRgb(155, 155, 255);
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else
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ctx.setFillColorRgb(0, 0, 0);
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ctx.fillRect(x * brickW, y * brickH, brickW, brickH);
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}
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}
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}
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} |