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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Boxes</title>
<link rel="stylesheet" href="../include/style.css">
</head>
<body>
<header>
Example from <a href="http://amzn.com/1430236655?tag=html5anim-20"><em>Foundation HTML5 Animation with JavaScript</em></a>
</header>
<canvas id="canvas" width="400" height="400"></canvas>
<script src="../include/utils.js"></script>
<script src="./classes/box.js"></script>
<script>
window.onload = function () {
var canvas = document.getElementById('canvas'),
context = canvas.getContext('2d'),
boxes = [],
activeBox = createBox(),
gravity = 0.2;
function createBox () {
var box = new Box(Math.random() * 40 + 10, Math.random() * 40 + 10);
box.x = Math.random() * canvas.width;
boxes.push(box);
return box;
}
function drawBox (box) {
if (activeBox !== box && utils.intersects(activeBox, box)) {
activeBox.y = box.y - activeBox.height;
activeBox = createBox();
}
box.draw(context);
}
(function drawFrame () {
window.requestAnimationFrame(drawFrame, canvas);
context.clearRect(0, 0, canvas.width, canvas.height);
activeBox.vy += gravity;
activeBox.y += activeBox.vy;
if (activeBox.y + activeBox.height > canvas.height) {
activeBox.y = canvas.height - activeBox.height;
activeBox = createBox();
}
boxes.forEach(drawBox);
}());
};
</script>
</body>
</html>