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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Distance</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>
<textarea id="log"></textarea>
<aside>Refresh page for another calculation.</aside>
<script src="../include/utils.js"></script>
<script>
window.onload = function () {
var canvas = document.getElementById('canvas'),
context = canvas.getContext('2d'),
log = document.getElementById('log');
//Create a black square, assign random position.
var rect1 = {
x: Math.random() * canvas.width,
y: Math.random() * canvas.height
};
context.fillStyle = "#000000";
context.fillRect(rect1.x - 2, rect1.y - 2, 4, 4);
//Create a red square, assign random position.
var rect2 = {
x: Math.random() * canvas.width,
y: Math.random() * canvas.height
};
context.fillStyle = "#ff0000";
context.fillRect(rect2.x - 2, rect2.y - 2, 4, 4);
//Calculate the distance between the two squares.
var dx = rect1.x - rect2.x,
dy = rect1.y - rect2.y,
dist = Math.sqrt(dx * dx + dy * dy);
//log output of distance value to screen
log.value = "distance: " + dist;
};
</script>
</body>
</html>