flint particle system：Part3

flint sparkler effect

火花效果
煙火效果
與前一篇雪花效果不同的地方在於，
emitter Counter 這次是一次性的，也就是 Blast
renderer 採用 BitmapRenderer，
並監聽滑鼠事件，當 click 時產生火花。

註

這裡單純比較 BitmapRenderer 及 DisplayObjectRenderer

兩種 renderer FPS，結果居然是 DisplayObjectRenderer 略勝，
讓我有些意外。

完整 code 如下：

	package
	{
	import flash.display.Sprite;
	import flash.events.Event;
	import flash.events.MouseEvent;
	import flash.geom.Point;
	import flash.geom.Rectangle;
	import net.hires.debug.Stats;
	import org.flintparticles.common.actions.Age;
	import org.flintparticles.common.actions.Fade;
	import org.flintparticles.common.counters.Blast;
	import org.flintparticles.common.counters.Steady;
	import org.flintparticles.common.displayObjects.Dot;
	import org.flintparticles.common.displayObjects.Line;
	import org.flintparticles.common.events.EmitterEvent;
	import org.flintparticles.common.initializers.ColorInit;
	import org.flintparticles.common.initializers.Lifetime;
	import org.flintparticles.common.initializers.SharedImage;
	import org.flintparticles.twoD.actions.Accelerate;
	import org.flintparticles.twoD.actions.LinearDrag;
	import org.flintparticles.twoD.actions.Move;
	import org.flintparticles.twoD.actions.RotateToDirection;
	import org.flintparticles.twoD.activities.FollowMouse;
	import org.flintparticles.twoD.emitters.Emitter2D;
	import org.flintparticles.twoD.initializers.Velocity;
	import org.flintparticles.twoD.renderers.BitmapRenderer;
	import org.flintparticles.twoD.zones.DiscZone;
	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，一次性
	emitter.counter = new Blast(150);
	// particle init, set up the particle’s position, velocity, image, color, lifetime.
	// image
	var imageClass:SharedImage = new SharedImage(new Line(8));
	emitter.addInitializer(imageClass);
	// position
	// velocity：放射狀
	var velocity:Velocity = new Velocity(new DiscZone(new Point(0,0), 100,0));
	emitter.addInitializer(velocity);
	// color
	emitter.addInitializer( new ColorInit( 0xFFFFFF00, 0xFFFF6600 ) );
	// life time
	emitter.addInitializer( new Lifetime(.4, .8));
	// 生命週(秒)
	emitter.addAction(new Age);
	// 移動
	emitter.addAction(new Move);
	// 淡出
	emitter.addAction(new Fade());
	// 加速度
	emitter.addAction(new Accelerate(0, 60));
	// follow direction.
	emitter.addAction(new RotateToDirection());
	// slow it down when it's moving.
	//emitter.addAction( new LinearDrag( 5 ) );
	// render
	var renderer:BitmapRenderer = new BitmapRenderer(new Rectangle( 0, 0, 1000, 600 ) );
	addChild(renderer);
	renderer.addEmitter(emitter);
	// follow mouse
	//emitter.addActivity(new FollowMouse(renderer));
	emitter.x = 500;
	emitter.y = 300;
	emitter.addEventListener( EmitterEvent.EMITTER_EMPTY, restart, false, 0, true );
	//emitter.start();
	stage.addEventListener( MouseEvent.CLICK, explode, false, 0, true );
	}
	private function explode(e:MouseEvent):void
	{
	emitter.x = mouseX;
	emitter.y = mouseY;
	emitter.start();
	}
	private function restart(e:EmitterEvent):void
	{
	Emitter2D(e.target).stop();
	}
	}
	}

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