Particle flow

Particle flow
* by Mr.doob (http://mrdoob.com)
* 
* Click for a new one

by mrdoob 03 May 2009

• Related works: 2

Tags

bitmap flow particle particles perlinnoise パーティクル祭
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/*
 * Particle flow
 * by Mr.doob (http://mrdoob.com)
 * 
 * Click for a new one
 */

package  
{
	import flash.display.StageAlign;	
	import flash.display.StageScaleMode;	
	import flash.display.StageQuality;	
	import flash.display.Bitmap;
	import flash.display.BitmapData;
	import flash.display.Sprite;
	import flash.events.Event;
	import flash.events.MouseEvent;
	import flash.geom.ColorTransform;	

	/**
	 * @author mrdoob
	 */
	[SWF(width="512", height="512", backgroundColor="#ffffff", frameRate="60")]
	public class Main extends Sprite 
	{
		private var map : BitmapData;
		private var canvas : BitmapData;
		private var particles :Vector.<Particle>;
		
		private var particles_amount : int = 5000;

		public function Main()
		{
			addEventListener(Event.ADDED_TO_STAGE, onAddedToStage);
		}
		
		private function onAddedToStage(e : Event):void
		{
			removeEventListener(Event.ADDED_TO_STAGE, onAddedToStage);

			stage.scaleMode = StageScaleMode.NO_SCALE;
			stage.align = StageAlign.TOP_LEFT;
			stage.quality = StageQuality.LOW;
			
			map = new BitmapData( stage.stageWidth, stage.stageHeight, false, 0x000000);

			canvas = new BitmapData( stage.stageWidth, stage.stageHeight, false, 0x000000);
			
			addChild( new Bitmap(canvas) );

			particles = new Vector.<Particle>();
			
			for (var i : int = 0; i < particles_amount; i++)
				particles[i] = new Particle();
			
			onClick(null);
			
			stage.addEventListener( MouseEvent.CLICK, onClick );
			addEventListener( Event.ENTER_FRAME, onEnterFrame );
		}
		
		private function onEnterFrame( e : Event ) : void
		{
			canvas.lock();
			
			//canvas.fillRect(canvas.rect, 0x000000);
			
			for (var i : uint = 0; i < particles_amount; i++)
			{
				var direction : uint = map.getPixel(particles[i].x, particles[i].y);

				particles[i].x += ((direction & 0xff) * 0.015625) - 2;
				particles[i].y += ((direction >> 8 & 0xff) * 0.015625) - 2;
				
				particles[i].x < 0 ? particles[i].x += canvas.width : particles[i].x > canvas.width ? particles[i].x -= canvas.width : null;
				particles[i].y < 0 ? particles[i].y += canvas.height : particles[i].y > canvas.height ? particles[i].y -= canvas.height : null;
				
				canvas.setPixel(particles[i].x, particles[i].y, particles[i].color );
			}
			
			canvas.unlock();
			canvas.colorTransform( canvas.rect, new ColorTransform( 1, 1, 1, 1, -3, -3, -3 ) );
		}
		
		private function onClick( e : MouseEvent ) : void
		{
			for (var i : int = 0; i < particles_amount; i++)
			{
				particles[i].x = Math.random() * canvas.width;
				particles[i].y = Math.random() * canvas.height;
				particles[i].color = Math.random() * 0xffff + 0xff0000;
			}
			
			map.perlinNoise(Math.random() * 1000, Math.random() * 1000, 5, Math.random() * 1000, true, true);
		}
	}
}

class Particle 
{
	public var x : Number = 0;
	public var y : Number = 0;
	public var color : int = 0;
}