flint snow effect

flintSnow.as

package
{
	import flash.display.Sprite;
	import flash.events.Event;
	import flash.geom.Point;
	import flash.geom.Rectangle;
	import net.hires.debug.Stats;
	import org.flintparticles.common.counters.Steady;
	import org.flintparticles.common.displayObjects.RadialDot;
	import org.flintparticles.common.initializers.ImageClass;
	import org.flintparticles.common.initializers.ScaleImageInit;
	import org.flintparticles.twoD.actions.RandomDrift;
	import org.flintparticles.twoD.actions.DeathZone;
	import org.flintparticles.twoD.actions.Move;
	import org.flintparticles.twoD.emitters.Emitter2D;
	import org.flintparticles.twoD.initializers.Position;
	import org.flintparticles.twoD.initializers.Velocity;
	import org.flintparticles.twoD.renderers.BitmapRenderer;
	import org.flintparticles.twoD.renderers.DisplayObjectRenderer;
	import org.flintparticles.twoD.renderers.PixelRenderer;
	import org.flintparticles.twoD.zones.LineZone;
	import org.flintparticles.twoD.zones.PointZone;
	import org.flintparticles.twoD.zones.RectangleZone;
	
	public class Main extends Sprite
	{
		private var emitter:Emitter2D;
		
		public function Main():void
		{
			if (stage)
				init();
			else
				addEventListener(Event.ADDED_TO_STAGE, init);
		}
		
		private function init(e:Event = null):void
		{
			removeEventListener(Event.ADDED_TO_STAGE, init);
			// entry point
			
			// stats
			addChild(new Stats);
			
			// emiiter
			emitter = new Emitter2D();
			
			// counter，每秒產生 50 個粒子
			emitter.counter = new Steady(50);
			
			// particle init, set up the particle’s position, velocity, image, color, lifetime.
			// image
			var imageClass:ImageClass = new ImageClass(RadialDot, [2]);
			emitter.addInitializer(imageClass);
			// position
			var position:Position = new Position(new LineZone(new Point(-5, -5), new Point(1005, -5)));
			emitter.addInitializer(position);
			// velocity，向下
			var velocity:Velocity = new Velocity(new PointZone(new Point(0, 60)));
			emitter.addInitializer(velocity);
			// scale
			var scaleImage:ScaleImageInit = new ScaleImageInit(0.75, 2);
			emitter.addInitializer(scaleImage);

			// action
			emitter.addAction(new Move);
			// random drift action
			var rd:RandomDrift = new RandomDrift( 20, 20 )
			emitter.addAction(rd);
			// remove particle，進入 deadthZone 區域就移除粒子
			var dzone:RectangleZone = new RectangleZone( -10, -10, 1020, 605 );
			var deathZone:DeathZone = new DeathZone( dzone, true );
			emitter.addAction( deathZone );
			
			// render
			var renderer:DisplayObjectRenderer = new DisplayObjectRenderer();
			addChild(renderer);
			
			renderer.addEmitter(emitter);
			emitter.start();

			// 快轉十秒，讓雪花先填滿螢幕
			emitter.runAhead(10);
		}
	
	}

}