<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Curve Through Point</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>
<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),
x0 = 100,
y0 = 200,
x2 = 300,
y2 = 200;
canvas.addEventListener('mousemove', function () {
context.clearRect(0, 0, canvas.width, canvas.height);
var x1 = mouse.x * 2 - (x0 + x2) / 2,
y1 = mouse.y * 2 - (y0 + y2) / 2;
//curve through mouse
context.beginPath();
context.moveTo(x0, y0);
context.quadraticCurveTo(x1, y1, x2, y2);
context.stroke();
}, false);
};
</script>
</body>
</html>