aparler/RosettaCodeData
1
0
Fork 0
Code Issues 12 Pull requests 3 Projects Releases Packages Wiki Activity Actions

A-M baby

Browse source
This commit is contained in:
Ingy döt Net 2013-04-10 21:29:02 -07:00
parent 764da6cbbb
commit db842d013d
19005 changed files with 197040 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

66
Task/Mandelbrot-set/JavaScript/mandelbrot-set-1.js Normal file
View file

@ -0,0 +1,66 @@
function Mandeliter(cx, cy, maxiter)
{
var i;
var x = 0.0;
var y = 0.0;
for (i = 0; i < maxiter && x*x + y*y <= 4; ++i)
{
var tmp = 2*x*y;
x = x*x - y*y + cx;
y = tmp + cy;
}
return i;
}
function Mandelbrot()
{
var width = 900;
var height = 600;
var cd = document.getElementById('calcdata');
var xmin = parseFloat(cd.xmin.value);
var xmax = parseFloat(cd.xmax.value);
var ymin = parseFloat(cd.ymin.value);
var ymax = parseFloat(cd.ymax.value);
var iterations = parseInt(cd.iterations.value);
var ctx = document.getElementById('mandelimage').getContext("2d");
var img = ctx.getImageData(0, 0, width, height);
var pix = img.data;
for (var ix = 0; ix < width; ++ix)
for (var iy = 0; iy < height; ++iy)
{
var x = xmin + (xmax-xmin)*ix/(width-1);
var y = ymin + (ymax-ymin)*iy/(height-1);
var i = Mandeliter(x, y, iterations);
var ppos = 4*(900*iy + ix);
if (i == iterations)
{
pix[ppos] = 0;
pix[ppos+1] = 0;
pix[ppos+2] = 0;
}
else
{
var c = 3*Math.log(i)/Math.log(iterations - 1.0);
if (c < 1)
{
pix[ppos] = 255*c;
pix[ppos+1] = 0;
pix[ppos+2] = 0;
}
else if (c < 2)
{
pix[ppos] = 255;
pix[ppos+1] = 255*(c-1);
pix[ppos+2] = 0;
}
else
{
pix[ppos] = 255;
pix[ppos+1] = 255;
pix[ppos+2] = 255*(c-2);
}
}
pix[ppos+3] = 255;
}
ctx.putImageData(img,0,0);
}

38
Task/Mandelbrot-set/JavaScript/mandelbrot-set-2.js Normal file
View file

@ -0,0 +1,38 @@
<!DOCTYPE html>
<html>
<head>
<title>Mandelbrot set</title>
<script src="Mandelbrot.js" type="text/javascript"></script>
</head>
<body onload="Mandelbrot()">
<h1>Mandelbrot set</h1>
<form id="calcdata" onsubmit="javascript:Mandelbrot(); return false;">
<table>
<tr>
<td>xmin =</td>
<td><input name="xmin" type="text" size="10" value="-2"></td>
<td>xmax =</td>
<td><input name="xmax" type="text" size="10" value="1"></td>
</tr>
<tr>
<td>ymin =</td>
<td><input name="ymin" type="text" size="10" value="-1"></td>
<td>ymax =</td>
<td><input name="ymax" type="text" size="10" value="1"></td>
</tr>
</table>
<p>iterations =
<input name="iterations" type="text" size="10" value="1000"></p>
<p>
<input type="submit" value=" Calculate ">
<input type="reset" value=" Reset form ">
</p>
</form>
<canvas id="mandelimage" width="900" height="600">
This page needs a browser with canvas support.
</canvas>
</body>
</html>