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distancel.html
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<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>Distance</title>
<link rel="stylesheet" type="text/css" href="./css/style.css" />
</head>
<body>
<canvas id="canvas" width="1200" height="400"></canvas>
<textarea id="log"></textarea>
<script type="text/javascript" src="./js/utils.js"></script>
<script type="text/javascript" src="./js/ball.js"></script>
<script type="text/javascript">
window.onload = function(){
var canvas = document.getElementById('canvas'),
context = canvas.getContext('2d'),
log = document.getElementById('log');
var rect1 = {
x: Math.random() * canvas.width,
y: Math.random() * canvas.height
};
context.fillStyle = '#000000';
context.fillRect(rect1.x, rect1.y, 20, 20);
var rect2 = {
x: Math.random() * canvas.width,
y: Math.random() * canvas.height
};
context.fillStyle = '#ff0000';
context.fillRect(rect2.x - 2, rect2.y - 2, 20, 20);
var dx = rect1.x - rect2.x,
dy = rect1.y -rect2.y,
dist = Math.sqrt(dx * dx + dy * dy);
log.value = "distance:" + dist;
}
</script>
</body>
</html>