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ActionScript

package {
    import flash.display.Bitmap;
    import flash.display.BitmapData;
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.filters.BitmapFilterQuality;
    import flash.filters.BlurFilter;
    import flash.geom.Point;

//[SWF(width = '512', height = '512')]
    public class MPAngelo2 extends Sprite
    {
        private const NUM_P : uint = 222222;
        /* + */
        private var p__ : Particle;
        private var buf : Vector.<uint>;
        private var bmd : BitmapData;
        private var ofscr : BitmapData;
        private var blur : BlurFilter;
        private var dstp : Point;
        private var fcnt : int;

public function MPAngelo2()
        {
            stage.stageFocusRect = mouseEnabled = mouseChildren = tabEnabled = tabChildren = false;
            stage.scaleMode = 'noScale';
            stage.align = 'TL';
            stage.quality = 'low';
            stage.frameRate = 64;
            opaqueBackground = 0x0;

/* + */
            
            var p : Particle = p__ = new Particle();
                  
            var n : uint = NUM_P;
            while (--n != 0)
            {
                var f : Number = n / NUM_P;
                var a : Number = f * 7.283185307179586;
                var aa : Number = (1 / f) * 6.283185307179586;
                var fuz : Number = 0.85 + 0.15 * Math.random();
                
                p.x = p.dx = 256 + (2048 - (1024 * Math.cos(aa * fuz) * fuz)) * Math.cos(a * fuz);
                p.y = p.dy = 256 + (2048 - (1024 * Math.sin(aa * fuz) * fuz)) * Math.sin(a * fuz);

if (f < 0.5)
                {
                    p.rr = 5;
                    p.gg = 3;
                    p.bb = 1;
                }
                else
                {
                    p.rr = 1;
                    p.gg = 3;
                    p.bb = 5;
                }

p = p.next = new Particle();
            }
            
            /* + */
           
            var bm : Bitmap = new Bitmap(bmd = new BitmapData(1024, 1024, false, 0x0));
            bm.x = bm.y = (465 - 512) / 2;
            bm.opaqueBackground = 0x0;
            addChild(bm);

ofscr = bmd.clone();
            buf = new Vector.<uint>(512 * 512, true);
            blur = new BlurFilter(6, 8, BitmapFilterQuality.HIGH);
            dstp = new Point();

/* + */

addEventListener(Event.ENTER_FRAME, oef);
        }

private function oef(e : Event) : void
        {
            fcnt++;

var t : Number = (fcnt & 131071) / 131072;
            var rx : Number = Math.cos(t);
            var ry : Number = Math.sin(t);

ofscr.applyFilter(bmd, bmd.rect, dstp, blur);
            var buf : Vector.<uint> = ofscr.getVector(ofscr.rect);
            
            var p : Particle = p__;
            while (p != null)
            {
                /* + + + MIDPOINT MAGIC + + + */

var dx : int = p.dx - 256;
                var dy : int = p.dy - 256;

p.dx = 256 + (rx * dx) - (ry * dy);
                p.dy = 256 + (rx * dy) + (ry * dx);

p.x += (p.dx - p.x) >> 4;
                p.y += (p.dy - p.y) >> 7;

/* + */

var pos : uint = ((p.y & 511) << 9) + (p.x & 511);

var c : uint = buf[pos];
                var r : uint = (c >> 16 & 0xFF) + p.rr;
                var g : uint = (c >> 8 & 0xFF) + p.gg;
                var b : uint = (c & 0xFF) + p.bb;

if (r > 0xFF) r = 0xFF;
                if (g > 0xFF) g = 0xFF;
                if (b > 0xFF) b = 0xFF;

buf[pos] = r << 16 | g << 8 | b;

p = p.next;
            }

bmd.setVector(bmd.rect, buf);
        }
    }
}

internal class Particle
{
    public var next : Particle;
    public var rr : uint;
    public var gg : uint;
    public var bb : uint;
    public var x : int;
    public var y : int;
    public var dx : int;
    public var dy : int;
}

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