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| <html> | |
| <body> | |
| <canvas id="demo" height="640" width="640" style="background-color: white;"></div> | |
| </body> | |
| <script type="text/javascript"> | |
| var canvas = document.getElementById('demo'); | |
| var context = canvas.getContext('2d'); | |
| var start = new Date(); | |
| var lines = 12, | |
| cW = context.canvas.width, | |
| cH = context.canvas.height; | |
| var draw = function() { | |
| var rotation = parseInt(((new Date() - start) / 1000) * lines) / lines; | |
| context.save(); | |
| context.clearRect(0, 0, cW, cH); | |
| context.translate(cW / 2, cH / 2); | |
| context.rotate(Math.PI * 2 * rotation); | |
| for (var i = 0; i < lines; i++) { | |
| context.beginPath(); | |
| context.rotate(Math.PI * 2 / lines); | |
| context.moveTo(cW / 10, 0); | |
| context.lineTo(cW / 4.5, 0); | |
| context.lineWidth = cW / 30; | |
| context.strokeStyle = "rgba(0,0,0," + i / lines + ")"; | |
| context.stroke(); | |
| } | |
| context.restore(); | |
| }; | |
| window.setInterval(draw, 30); | |
| </script> | |
| </html> |
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