flint particle system：Part2

flint 粒子系統教學：Part2
前一篇已大致說明 flint 粒子系統原理，
emitter -> particle -> renderer

接下來實作雪花效果，如圖

程式碼說明寫得很清楚，就不多寫了，
如下：

	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);
	}
	}
	}

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