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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Mouse 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>Move mouse on canvas element.</aside>
<script src="../include/utils.js"></script>
<script>
window.onload = function () {
var canvas = document.getElementById('canvas'),
context = canvas.getContext('2d'),
mouse = utils.captureMouse(canvas),
log = document.getElementById('log'),
rect = {x: canvas.width / 2, y: canvas.height / 2};
(function drawFrame () {
window.requestAnimationFrame(drawFrame, canvas);
context.clearRect(0, 0, canvas.width, canvas.height);
var dx = rect.x - mouse.x,
dy = rect.y - mouse.y,
dist = Math.sqrt(dx * dx + dy * dy);
//draw square
context.fillStyle = "#000000";
context.fillRect(rect.x - 2, rect.y - 2, 4, 4);
//draw line
context.beginPath();
context.moveTo(rect.x, rect.y);
context.lineTo(mouse.x, mouse.y);
context.closePath();
context.stroke();
//log output of distance value to screen
log.value = "distance: " + dist;
}());
};
</script>
</body>
</html>