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netsurf/test/js/js-fractal.html
2016-02-06 12:51:44 +00:00

40 lines
951 B
HTML

<!DOCTYPE html>
<html>
<head>
<title>JavaScript mandelbrot set</title>
<style>pre {font-size:8pt;}</style>
</head>
<body>
<h1>JavaScript generated mandelbrot set</h1>
<noscript><p>Javascript is disabled</p></noscript>
<script>
function show_mandelbrot()
{
var gradation = " .,:;=|i+IhHOE#$ ";
document.writeln("<pre>");
for(i = -1.2; i <= 1.2; i += 0.04) {
for(r = -2; r <= 1; r += 0.02) {
var zr = r;
var zi = i;
var n = 0;
for(; n < 16; n++) {
var zr2 = zr * zr;
var zi2 = zi * zi;
if((zr2 + zi2) > 4) {
break;
}
zi = 2 * zr * zi + i;
zr = zr2 - zi2 + r;
}
document.write(gradation.charAt(n));
}
document.write("\n");
}
document.writeln("</pre>");
document.close();
}
show_mandelbrot();
</script>
</body>
</html>