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timdp/bouncy.html

Created June 5, 2013 13:37
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Bouncy
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bouncy.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Bouncy</title>
<style>
html, body {
margin: 0;
padding: 0;
width: 100%;
height: 100%;
overflow: hidden;
background: silver;
}
#content {
margin: 0;
padding: 0;
border: 0;
display: none;
}
</style>
<script>
window.onload = function() {
var frame = document.getElementById("content");
var velocity = 2;
var fps = 30;
var a = Math.PI / 6;
//console.log(a / (2 * Math.PI) * 360);
var minX = 0;
var minY = 0;
var maxX = document.body.clientWidth - frame.width;
var maxY = document.body.clientHeight - frame.height;
frame.style.position = "absolute";
frame.style.left = (document.body.clientWidth - frame.width) / 2 + "px";
frame.style.top = (document.body.clientHeight - frame.height) / 2 + "px";
frame.style.display = "inherit";
window.setInterval(function() {
var x = parseInt(frame.style.left.replace("px", ""), 10);
var y = parseInt(frame.style.top.replace("px", ""), 10);
x += Math.cos(a) * velocity;
y += Math.sin(a) * velocity;
if (x < minX) {
x = minX;
a = (a < Math.PI)
? Math.PI - a
: 3 * Math.PI - a;
//console.log("< " + a / (2 * Math.PI) * 360);
} else if (x > maxX) {
x = maxX;
a = (a < Math.PI)
? Math.PI - a
: 3 * Math.PI - a;
//console.log("> " + a / (2 * Math.PI) * 360);
}
if (y < minY) {
y = minY;
a = 2 * Math.PI - a;
//console.log("^ " + a / (2 * Math.PI) * 360);
} else if (y > maxY) {
y = maxY;
a = 2 * Math.PI - a;
//console.log("v " + a / (2 * Math.PI) * 360);
}
frame.style.left = x + "px";
frame.style.top = y + "px";
}, 1000 / fps);
};
</script>
</head>
<body>
<iframe id="content" src="content.html"
frameborder="0" marginwidth="0" marginheight="0"
width="800" height="600"></iframe>
</body>
</html>
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