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Mandelbrot Canvas
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<html> | |
<head> | |
<script type="text/javascript"> | |
window.onload = function() { | |
var mandelbrotCanvas = document.getElementById('mandelbrotCanvas'); | |
var context = mandelbrotCanvas.getContext('2d'); | |
var width = mandelbrotCanvas.width; | |
var height = mandelbrotCanvas.height; | |
var max_iter = 1000; | |
var saturation = 80; | |
var lightness = 50; | |
for (i=0;i<width;i++) { | |
for (j=0;j<height;j++) { | |
var Za = 0; | |
var Zb = 0; | |
var Ca = 3*i/(width -1) - 2.25; | |
var Cb = 2*j/(height-1) - 1; | |
var iter = 0; | |
var Zas = 0; | |
var Zan; | |
while((Zas + Zb*Zb) < 4 && iter < max_iter) { | |
Zas = Za*Za; | |
Zan = Zas - Zb*Zb + Ca; | |
Zb = 2*Za*Zb + Cb; | |
Za = Zan; | |
iter++; | |
} | |
if (iter === max_iter) { | |
context.fillStyle = 'black'; | |
} else { | |
// Smooth colouring algorithm. See | |
http://stackoverflow.com/questions/369438 | |
var nsmooth = iter + 1 - Math.log(Math.log(Math.sqrt(Zas | |
+ Zb*Zb)))/Math.log(2); | |
var hue = 0.95 + 10*nsmooth; | |
context.fillStyle = 'hsl(' + hue + ', ' + saturation + | |
'%, ' + lightness + '%)'; | |
} | |
context.fillRect(i, j, 1, 1); | |
} | |
} | |
} | |
</script> | |
</head> | |
<body> | |
<canvas id="mandelbrotCanvas" width="400" height="200"> | |
</canvas> | |
</body> | |
</html> |
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