Meta Ball の練習

by matsu4512 20 May 2010

Embed

/**
 * Copyright matsu4512 ( http://wonderfl.net/user/matsu4512 )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/qU4s
 */

package{
	import flash.display.Bitmap;
	import flash.display.BitmapData;
	import flash.display.Sprite;
	import flash.display.StageAlign;
	import flash.display.StageScaleMode;
	import flash.events.Event;
	import flash.filters.BitmapFilterQuality;
	import flash.filters.BlurFilter;
	import flash.geom.Point;
	import flash.geom.Rectangle;
	
	[SWF(width=465, height=465)]
	public class MetaBall3 extends Sprite{
		private var dotsSp:Sprite = new Sprite();
		private var metaBallBmp:Bitmap;
		private var metaBallBmpData:BitmapData;
		private var baseSp:Sprite = new Sprite();
		
		private var metaBlur:BlurFilter = new BlurFilter(50, 50); 
		private var balls:Vector.<Ball>;
		private var rect:Rectangle;
		private var destPt:Point;
		
		public function MetaBall3(){
			
			dotsSp.graphics.lineStyle(0, 0, 0);
			dotsSp.graphics.beginFill(0xFFFFFF);
			dotsSp.graphics.drawRect(0, 0, 465, 465);
			dotsSp.graphics.endFill();
			dotsSp.alpha = 0;
			
			metaBallBmpData = new BitmapData(465, 465, false, 0xFFFFFF);
			metaBallBmp = new Bitmap(metaBallBmpData);
			metaBallBmp.filters = [new BlurFilter(16, 16, BitmapFilterQuality.LOW)];
			
			baseSp.addChild(metaBallBmp);
			baseSp.addChild(dotsSp);
			addChild(baseSp);
			
			for(var i:int = 0; i < 30; i++){
				var sp:Sprite = new Sprite();
				sp.graphics.beginFill(0xFFFFFF*Math.random());
				sp.graphics.drawCircle(0,0,10);
				sp.graphics.endFill();
				sp.x = Math.random()*465;
				sp.y = Math.random()*465;
				dotsSp.addChild(sp);
			}
			
			dotsSp.filters = [metaBlur];
			
			rect = new Rectangle(0, 0, metaBallBmpData.width, metaBallBmpData.height);
			destPt = new Point(0,0);
			
			balls = new Vector.<Ball>();
			
			addEventListener(Event.ENTER_FRAME, onEnterFrame);
		}
		
		private function onEnterFrame(event:Event):void{
			var b:Ball = new Ball(mouseX, mouseY, Math.random()*10-5, Math.random()*10-5, 0x0, Math.random()*10+10);
			dotsSp.addChild(b);
			balls.push(b);
			
			var i:int = balls.length;
			while(i--){
				b = balls[i];
				b.update();
				
				if(b.x < 0){
					b.x = 0;
					b.vx *= -1;
				}
				
				if(b.x > 465){
					b.x = 465;
					b.vx *= -1;
				}
				
				if(b.y > 465){
					b.y = 465;
					b.vy = 0;
				}
				else b.vy += 0.1;
				
				if(b.y == 465 && (b.x > 220 && b.x < 250)){
					balls.splice(i,1);
					dotsSp.removeChild(b);
					b = null;
				}
			}
			
			metaBallBmpData.draw(dotsSp);
			var threshold:uint =  0x00999999; 
			var color:uint = 0x0000FF00;
			var maskColor:uint = 0x00FFFFFF;
			metaBallBmpData.threshold(metaBallBmpData, rect, destPt, "<", threshold, color, maskColor, false);
		}
	}
}
import flash.display.Shape;

class Ball extends Shape{
	public var vx:Number, vy:Number, color:uint;
	public function Ball(x:Number, y:Number, vx:Number, vy:Number, c:uint, s:Number){
		this.x = x; this.y = y; this.vx = vx; this.vy = vy; color = c;
		graphics.beginFill(color);
		graphics.drawCircle(0,0,s);
		graphics.endFill();
	}
	
	public function update():void{
		x += vx;
		y += vy;
	}
}