Metaball via BitmapData.threshold/Blur Value

by bradsedito 17 Feb 2012

• Forked from hrtsgt's Metaball by BitmapData.threshold
• Diff: 35
• Related works: 1
Embed

package
{
    import flash.display.*;
    import flash.events.*;
    import flash.geom.*;
    import flash.filters.*;
    
    [SWF(backgroundColor="0x000000", frameRate="30")]  
    
    
    public class MetaballThreshold extends Sprite
    {
        private var ballMax:uint = 2;
        private var ballContainer:Sprite;
        private var bmp:Bitmap;
        private var bmpData:BitmapData;
        private var tmpBmpData:BitmapData;
    
        public function MetaballThreshold()
        {
            this.addEventListener( Event.ADDED_TO_STAGE, onAddedHandler);
        }
        
        private function onAddedHandler( e:Event ):void
        {
            this.removeEventListener( Event.ADDED_TO_STAGE,onAddedHandler );
            
            ballContainer = new Sprite();
            ballContainer.visible = false;
            addChild( ballContainer );
            for(var i:uint=0; i<ballMax; i++){
                var ball:Ball = new Ball();
                ballContainer.addChild(ball);
            }
            bmpData = new BitmapData(stage.stageWidth, stage.stageHeight, false, 0xFF000000);
            tmpBmpData = new BitmapData( stage.stageWidth, stage.stageHeight, false, 0xFF000000);
            bmp = new Bitmap( bmpData );
            addChild( bmp );
            this.addEventListener( Event.ENTER_FRAME, onEnterFrame);//
        }
        
        private function onEnterFrame( e:Event ):void{
            tmpBmpData.fillRect( tmpBmpData.rect, 0xFF000000);
            tmpBmpData.draw( ballContainer );
            bmpData.fillRect( tmpBmpData.rect, 0xFF000000);
            //tmpBmpDataの0x808080(50%)より白い箇所を0xD9FF66に置換してbmpDataにdrawする
            bmpData.threshold( tmpBmpData, bmpData.rect, new Point( 0, 0), ">=", 0x00808080, 0xFFD9FF66, 0x00FFFFFF, false);
        }
        
    }
}


import flash.display.*;
import flash.events.*;
import flash.filters.*;
class Ball extends Sprite
{
    private var _ball:Sprite;
    private var ballSize:Number = 100;
    private var speedX:Number = (Math.random()*6 - 3)*(Math.floor(Math.random()*2)*2 - 1);
    private var speedY:Number = (Math.random()*6 - 3)*(Math.floor(Math.random()*2)*2 - 1);
    private var blurFilter:BlurFilter = new BlurFilter( 64, 64, 1);
    
    public function Ball(){
        this.addEventListener( Event.ADDED_TO_STAGE, onAdded);//
    }
    
    private function onAdded( e:Event ):void{
        this.removeEventListener( Event.ADDED_TO_STAGE, onAdded);//
        _ball = new Sprite();
        _ball.graphics.beginFill( 0xFFFFFF, 1);
        _ball.graphics.drawCircle( 0, 0, ballSize);
        _ball.graphics.endFill();
        _ball.x = stage.stageWidth/2;
        _ball.y = stage.stageHeight/2;
        _ball.filters = [blurFilter];
        addChild(_ball);
        this.addEventListener( Event.ENTER_FRAME, moveBall);//
    }
    
    private function moveBall( e:Event ):void{
        _ball.x += speedX;
        _ball.y += speedY;
        if( _ball.x > stage.stageWidth - ballSize ){
            _ball.x = stage.stageWidth - ballSize;
            speedX *= -1;
        }else if( _ball.x < ballSize ){
            _ball.x = ballSize;
            speedX *= -1;
        }
        if( _ball.y > stage.stageHeight - ballSize ){
            _ball.y = stage.stageHeight - ballSize;
            speedY *= -1;
        }else if( _ball.y < ballSize ){
            _ball.y = ballSize;
            speedY *= -1;
        }
    }
    
}