50 lines
1.4 KiB
JavaScript
50 lines
1.4 KiB
JavaScript
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var initId = 0;
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var world = createWorld();
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var ctx;
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var canvasWidth;
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var canvasHeight;
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var canvasTop;
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var canvasLeft;
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function setupWorld(did) {
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if (!did) did = 0;
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world = createWorld();
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initId += did;
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initId %= demos.InitWorlds.length;
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if (initId < 0) initId = demos.InitWorlds.length + initId;
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demos.InitWorlds[initId](world);
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}
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function setupNextWorld() { setupWorld(1); }
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function setupPrevWorld() { setupWorld(-1); }
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function step(cnt) {
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var stepping = false;
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var timeStep = 1.0/60;
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var iteration = 1;
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world.Step(timeStep, iteration);
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ctx.clearRect(0, 0, canvasWidth, canvasHeight);
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drawWorld(world, ctx);
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setTimeout('step(' + (cnt || 0) + ')', 10);
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}
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Event.observe(window, 'load', function() {
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setupWorld();
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ctx = $('canvas').getContext('2d');
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var canvasElm = $('canvas');
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canvasWidth = parseInt(canvasElm.width);
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canvasHeight = parseInt(canvasElm.height);
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canvasTop = parseInt(canvasElm.style.top);
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canvasLeft = parseInt(canvasElm.style.left);
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Event.observe('canvas', 'click', function(e) {
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//setupNextWorld();
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if (Math.random() < 0.5)
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demos.top.createBall(world, Event.pointerX(e) - canvasLeft, Event.pointerY(e) - canvasTop);
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else
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createBox(world, Event.pointerX(e) - canvasLeft, Event.pointerY(e) - canvasTop, 10, 10, false);
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});
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Event.observe('canvas', 'contextmenu', function(e) {
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if (e.preventDefault) e.preventDefault();
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setupPrevWorld();
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return false;
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});
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step();
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});
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