124 lines
3.5 KiB
Dart
124 lines
3.5 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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import 'package:browserloop/src/03-VariableTimestep.dart';
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import 'package:browserloop/src/04-FixedLoopVariableRender.dart';
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import 'package:browserloop/src/02-AnimationFrameWhile.dart';
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import 'package:browserloop/src/05_DirtyFlagRendering.dart';
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List<Example> examples = [
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Example("While Loop Example", "#while_loop"),
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Example("Fixed Update, Variable Render", "#fixed_variable"),
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Example("Variable Timestep", "#variable_timestep"),
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Example("Variable Render with Dirty Flag", "#dirty_flag")
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];
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LoopExample active;
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class Example {
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final String query;
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final String name;
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CanvasElement canvas = CanvasElement(width: 480, height: 480);
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LoopExample loop;
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Example(this.name, this.query);
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}
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void main() {
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examples.forEach((ex) {
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resetExample(ex);
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});
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}
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void appendToDOM(Example example) {
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querySelector(example.query).append(example.canvas);
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example.canvas.onClick.forEach(activate);
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print("${example.query} appended to DOM");
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}
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void removeFromDOM(Example example) {
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querySelector(example.query).children.clear();
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print("${example.query} removed from DOM");
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}
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void resetExample(Example ex) {
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removeFromDOM(ex);
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if (ex.loop != null) ex.loop.stop();
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ex.canvas =
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new CanvasElement(width: ex.canvas.width, height: ex.canvas.height);
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createPlaceholder(ex);
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appendToDOM(ex);
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}
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void createPlaceholder(Example ex) {
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if (ex.canvas == null) return;
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// Clear Canvas
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CanvasRenderingContext2D ctx = ex.canvas.context2D;
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Point c = Point(ex.canvas.width / 2, ex.canvas.height / 2);
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ctx.setFillColorRgb(255, 150, 10);
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ctx.fillRect(0, 0, ex.canvas.width, ex.canvas.height);
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// Draw Play Button
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ctx.beginPath();
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ctx.moveTo(c.x - 25, c.y - 25);
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ctx.lineTo(c.x + 25, c.y + 25);
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ctx.lineTo(c.x - 25, c.y + 75);
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ctx.closePath();
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ctx.lineWidth = 10;
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ctx.setStrokeColorRgb(155, 155, 155);
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ctx.setFillColorRgb(255, 255, 255);
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ctx.stroke();
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ctx.fill();
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// Draw Text
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ctx.fillText(ex.name, c.x - ctx.measureText(ex.name).width / 2, c.y - 50);
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print("${ex.query} placeholder created");
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}
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void activate(MouseEvent e) {
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if (e.target is! CanvasElement) return;
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CanvasElement c = (e.target as CanvasElement);
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examples.forEach((Example ex) {
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if (ex.canvas == c) {
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resetExample(ex);
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switch (ex.query) {
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case "#while_loop":
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ex.loop = new WhileLoop(new Game(ex.canvas));
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break;
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case "#fixed_variable":
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ex.loop = new FixedLoopVariableRender(new Game(ex.canvas));
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break;
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case "#variable_timestep":
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ex.loop = new VariableTimestep(new Game(ex.canvas));
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break;
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case "#dirty_flag":
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ex.loop = new DirtyFlagRender(new Game(ex.canvas));
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break;
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}
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if (ex.canvas != ex.loop.game.canvas) ex.loop.game.canvas = ex.canvas;
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addControls(ex);
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} else {
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resetExample(ex);
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}
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});
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}
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void addControls(Example ex) {
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querySelector(ex.query).append(new DivElement()
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..append(new ButtonElement()
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..text = "Start"
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..onClick.listen((e) {
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ex.loop.stop();
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ex.loop.start();
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}))
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..append(new ButtonElement()
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..text = "Stop"
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..onClick.listen((e) {
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ex.loop.stop();
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})));
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// querySelector('#reset').onClick.listen((e) => ex.loop.game.reset());
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// querySelector('#plus').onClick.listen((e) => _changeGrid(-5));
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// querySelector('#minus').onClick.listen((e) => _changeGrid(5));
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}
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