Burning Ship Fractal
/**
* Copyright Aquioux ( http://wonderfl.net/user/Aquioux )
* MIT License ( http://www.opensource.org/licenses/mit-license.php )
* Downloaded from: http://wonderfl.net/c/kWGg
*/
// @see http://aquioux.net/blog/?p=1111
// forked from makc3d's if you're in that kind of thing...
// forked from jozefchutka's Fast mandelbrot
// forked from makc3d's forked from: マンデルブロ高速化
// forked from toyoshim's マンデルブロ高速化
// forked from toyoshim's マンデルブロ @ Frocessing
package {
import flash.display.*;
//import flash.text.*;
//import flash.events.*;
// import frocessing.color.ColorHSV;
//import net.hires.debug.Stats;
[SWF(backgroundColor="0x000000")]
public class Mandelbrot extends Sprite
{
private var bmp:Bitmap;
private var img:BitmapData;
//private var txt:TextField = new TextField;
private var offset_x:Number = -9280.0;
private var offset_y:Number = -195.0;
private var zoom:Number = 23.0;
// private var colors:Vector.<uint> = new Vector.<uint>(256, true);
public function Mandelbrot()
{
stage.align = StageAlign.TOP_LEFT;
stage.scaleMode = StageScaleMode.NO_SCALE;
img = new BitmapData(stage.stageWidth, stage.stageHeight, false, 0);
bmp = new Bitmap(img);
stage.addChild(bmp);
// for(var i:uint=0; i < 256; i++)
// colors[i] = new ColorHSV(i).value32;
draw();
//stage.addEventListener(MouseEvent.CLICK, onClick);
//stage.addChild(new Stats());
//stage.addChild(txt);
//txt.width = 50;
//txt.height = 20;
//txt.x = stage.stageWidth - txt.width;
//txt.background = true;
}
/*
public function onClick(event:MouseEvent):void
{
offset_x = (offset_x + stage.mouseX - img.width / 2.0) / zoom;
offset_y = (offset_y + stage.mouseY - img.height / 2.0) / zoom;
zoom *= 2;
offset_x *= zoom;
offset_y *= zoom;
draw();
}
*/
private function draw():void
{
var d:Date = new Date;
img.setVector(img.rect, Fractals.mandelbrot2(
img.width, img.height, zoom, offset_x, offset_y, null, 0x33));
//txt.text = String(new Date().time - d.time) + " ms";
}
}
}
class Fractals
{
public static function mandelbrot2(
width:uint, height:uint, zoom:Number, offsetX:Number, offsetY:Number,
colors:Vector.<uint> = null, iterations:uint = 256, bailout:uint = 4):Vector.<uint>
{
var x:int, y:int, cx:Number, cy:Number, c:uint, rgb:uint;
var zx:Number, zy:Number, zxx:Number, zyy:Number, i:int, p:int = 0;
var wz:Number = 2 / width / zoom;
var hz:Number = 2 / height / zoom;
var ox:Number = offsetX + width * .8 / 3;
var oy:Number = offsetY + height / 2;
var data:Vector.<uint> = new Vector.<uint>(width * height, true);
if(!colors)
{
colors = new Vector.<uint>(iterations, true);
for(c = 0; c < iterations; c++)
rgb = 256 / iterations * c, colors[c] = rgb << 16 | rgb << 8 | rgb;
}
y = height;
while(y--)
{
x = width, cy = (oy - y) * hz;
while(x--)
{
cx = (ox - x) * wz, zx = zy = 0, i = iterations;
if ((cx + 1) * (cx + 1) + cy * cy < 0.0625) {
// period-2 bulb
data[p++] = colors [0]; continue;
}
var q:Number = (cx - 0.25) * (cx - 0.25) + cy * cy;
if (q * (q + (cx - 0.25)) * 4 < cy * cy) {
// cardioid
data[p++] = colors [0]; continue;
}
while(--i)
{
if (zx < 0) zx = -zx;
if (zy < 0) zy = -zy;
zxx = zx * zx, zyy = zy * zy;
if(zxx + zyy > 4)
break;
zy = 2 * zx * zy + cy, zx = zxx - zyy + cx;
}
data[p++] = colors[i];
}
}
return data;
}
}