砂

...
@author ue

by _ueueueueue 03 Mar 2010

Embed

/**
 * Copyright _ueueueueue ( http://wonderfl.net/user/_ueueueueue )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/pM8Y
 */

package 
{
	import flash.display.*;
	import flash.events.*;
	import flash.filters.BlurFilter;
	import flash.geom.*;
	import flash.text.*;
	import flash.ui.*;
	import flash.utils.Timer;
	
	[SWF(width=465,height=465,backgroundColor=0x0,frameRate=60)]
	
	/**
	 * ...
	 * @author ue
	 */
	
	public class Main extends Sprite 
	{
		private static const NUM:int = 1000;
		
		private var container:Sprite;
		private var balls:Array;
		private var point:Point;
		private var timer:Timer;
		private var canvas:BitmapData;
		
		public function Main():void 
		{
			canvas = new BitmapData(stage.stageWidth, stage.stageHeight, false, 0x0);
			var bmp:Bitmap = addChild(new Bitmap(canvas)) as Bitmap;
			bmp.blendMode = BlendMode.ADD;
			
			draw();
			
			point = new Point(Math.random()*stage.stageWidth,Math.random()*stage.stageHeight);
			
			timer = new Timer(200, 0);
			timer.addEventListener(TimerEvent.TIMER, onTimer);
			timer.start();
			
			addEventListener(Event.ENTER_FRAME, update);
			stage.addEventListener(MouseEvent.CLICK, draw);
		}
		
		private function draw(e:Event = null):void
		{
			container = new Sprite();
			canvas.fillRect(canvas.rect, 0x0);
			balls = new Array();
			var i:int;
			for (i = 0; i < NUM; i++)
			{
				var ball:Sprite = new Sprite();
				ball.graphics.beginFill(0xFFFFFF);
				ball.graphics.drawCircle(0, 0, 0.5);
				ball.graphics.endFill();
				ball.x = Math.random() * stage.stageWidth;
				ball.y = Math.random() * stage.stageHeight;
				container.addChild(ball);
				balls.push(ball);
			}
		}
		
		private function onTimer(e:TimerEvent):void 
		{
			point.x = stage.stageWidth * Math.random();
			point.y = stage.stageHeight * Math.random();
		}
		
		private function update(e:Event):void 
		{
			var i:int;
			for (i = 0; i < balls.length; i++)
			{
				var ball:Sprite = balls[i];
				if (i == 0)
				{
					ball.x += (point.x - ball.x) / 4;
					ball.y += (point.y - ball.y) / 4;
				}
				else
				{
					ball.x += (balls[i - 1].x -ball.x) / 4;
					ball.y += (balls[i - 1].y -ball.y) / 4;
				}
			}
			
			canvas.lock();
			canvas.draw(container);
			canvas.unlock();
		}
	}
}