Created
January 30, 2012 16:54
-
-
Save hrickards/1705401 to your computer and use it in GitHub Desktop.
Mandelbrot Canvas
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
<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 interval = 200; | |
for (i=0;i<width;i++) { | |
for (j=0;j<height;j++) { | |
var Za = 0; | |
var Zb = 0; | |
var Ca = 3.5*i/(width -1) - 2.5; | |
var Cb = 2*j/(height-1) - 1; | |
var iter = 0; | |
var Zas = 0 | |
while((Zas + Zb*Zb) < 4 && iter < max_iter) { | |
Zas = Za*Za; | |
var Zan = Zas - Zb*Zb + Ca; | |
Zb = 2*Za*Zb + Cb; | |
Za = Zan; | |
iter++; | |
} | |
if (iter == max_iter) { | |
colour = 'black'; | |
} else {; | |
var modulus = Math.round(Math.sqrt(Za*Za + Zb*Zb)) % 5; | |
switch(modulus) { | |
case 0: colour = 'FF3300'; break; | |
case 1: colour = '66CC33'; break; | |
case 2: colour = '33FFFF'; break; | |
case 3: colour = '0033FF'; break; | |
case 4: colour = 'FF00FF'; break; | |
} | |
} | |
context.fillStyle = colour; | |
context.fillRect(i, j, width/interval, height/interval); | |
} | |
} | |
}; | |
</script> | |
</head> | |
<body> | |
<canvas id="mandelbrotCanvas" width="800" height="400"> | |
</canvas> | |
</body> | |
</html> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment