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ActionScript

package {
    import flash.display.*;
    import flash.events.*;
    import flash.geom.ColorTransform;
    import flash.geom.Matrix;
    
    public class ColorfulSpring extends Sprite {
        private var array:Array = [];
        private const N:int = 50, minDist:int = 100, springAmount:Number = 0.0075;
        private var canvas:Bitmap, bmpData:BitmapData, sp:Sprite;
        private var tr:ColorTransform = new ColorTransform(1,1,1,0.5);
        
        public function ColorfulSpring() {
            graphics.beginFill(0);
            graphics.drawRect(0,0,465,465);
            graphics.endFill();
            
            sp = new Sprite();
            for(var i:int = 0; i < N; i++){
                var ball:Ball = new Ball(Math.random() * 10 - 5, Math.random() * 10 - 5, Math.random()*20+10, Math.random() * 0xFFFFFF);
                array.push(ball);
                ball.x = stage.stageWidth*Math.random();
                ball.y = stage.stageHeight*Math.random();
                sp.addChild(ball);
            }
            
            bmpData = new BitmapData(stage.stageWidth, stage.stageHeight, true, 0xFF000000);
            canvas = new Bitmap(bmpData);
            addChild(canvas);
            
            addEventListener(Event.ENTER_FRAME, onEnterFrame);
        }
        
        private function onEnterFrame(e:Event):void {
            
            bmpData.colorTransform(bmpData.rect, tr);
            bmpData.draw(sp);
            
            var len:uint = N;
            while(len--) {
                var ball:Ball = array[len];
                ball.x += ball.vx;
                ball.y += ball.vy;
                ball.alpha += (ball.toAlpha-ball.alpha)/4;
                ball.toAlpha = 0;
                if(ball.x < -20) ball.x = stage.stageWidth+20;
                else if(ball.x > stage.stageWidth+20) ball.x = -20;
                if(ball.y < -20) ball.y = stage.stageHeight+20;
                else if(ball.y > stage.stageHeight+20) ball.y = -20;
            }
            
            sp.graphics.clear();
            for(var i:int = 0; i < N - 1; i++){
                var partA:Ball = array[i];
                for(var j:uint = i + 1; j < N; j++){
                    var partB:Ball = array[j];
                    spring(partA, partB);
                }
            }
        }
        
        private function spring(b1:Ball, b2:Ball):void{
            var dx:Number = b2.x - b1.x;
            var dy:Number = b2.y - b1.y;
            var dist:Number = Math.sqrt(dx * dx + dy * dy);
            if(dist < minDist){                
                sp.graphics.lineStyle(1);
                var m:Matrix = new Matrix;
                m.createGradientBox(Math.abs(dx), Math.abs(dy), Math.atan2(dy,dx), Math.min(b1.x, b2.x), Math.min(b1.y, b2.y));
                sp.graphics.lineGradientStyle(GradientType.LINEAR, [b1.color, b2.color], [b1.alpha, b2.alpha],    [0,255], m);
                sp.graphics.moveTo(b1.x, b1.y);
                sp.graphics.lineTo(b2.x, b2.y);
                b1.toAlpha += 0.1;
                b2.toAlpha += 0.1;
                var ax:Number = dx * springAmount;
                var ay:Number = dy * springAmount;
                b1.vx += ax / b1.r;
                b1.vy += ay / b1.r;
                b2.vx -= ax / b2.r;
                b2.vy -= ay / b2.r;
            }
        }
    }
}

import flash.display.*;
import flash.filters.*;

class Ball extends Sprite {
    public var vx:Number, vy:Number, r:Number, toAlpha:Number, color:uint;
    
    public function Ball(vx:Number, vy:Number, r:Number, color:uint) {
        this.vx = vx; this.vy = vy; this.r = r; this.color = color;
        toAlpha = 0;
        
        graphics.lineStyle(2,0xFFFFFF);
        graphics.drawCircle(0, 0, r);
        filters = [new GlowFilter(color, 1, 16, 16, 6), new BlurFilter(2,2)];
        blendMode = BlendMode.ADD;
    }
}

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