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42 lines
1.2 KiB
HTML
42 lines
1.2 KiB
HTML
<!doctype html>
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<html>
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<head>
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<meta charset="utf-8">
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<title>Curve Through Point</title>
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<link rel="stylesheet" href="../include/style.css">
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</head>
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<body>
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<header>
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Example from <a href="http://amzn.com/1430236655?tag=html5anim-20"><em>Foundation HTML5 Animation with JavaScript</em></a>
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</header>
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<canvas id="canvas" width="400" height="400"></canvas>
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<aside>Move mouse on canvas element.</aside>
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<script src="../include/utils.js"></script>
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<script>
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window.onload = function () {
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var canvas = document.getElementById('canvas'),
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context = canvas.getContext('2d'),
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mouse = utils.captureMouse(canvas),
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x0 = 100,
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y0 = 200,
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x2 = 300,
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y2 = 200;
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canvas.addEventListener('mousemove', function () {
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context.clearRect(0, 0, canvas.width, canvas.height);
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var x1 = mouse.x * 2 - (x0 + x2) / 2,
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y1 = mouse.y * 2 - (y0 + y2) / 2;
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//curve through mouse
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context.beginPath();
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context.moveTo(x0, y0);
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context.quadraticCurveTo(x1, y1, x2, y2);
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context.stroke();
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}, false);
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};
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</script>
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</body>
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</html>
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