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ActionScript

package
{
	import flash.geom.Matrix3D;
	import flash.geom.Rectangle;
	import flash.geom.Vector3D;
	
	import away3d.animators.ParticleAnimationSet;
	import away3d.animators.ParticleAnimator;
	import away3d.animators.data.ParticleProperties;
	import away3d.animators.data.ParticlePropertiesMode;
	import away3d.animators.nodes.ParticleAccelerationNode;
	import away3d.animators.nodes.ParticleBezierCurveNode;
	import away3d.animators.nodes.ParticleBillboardNode;
	import away3d.animators.nodes.ParticleOrbitNode;
	import away3d.animators.nodes.ParticleOscillatorNode;
	import away3d.animators.nodes.ParticlePositionNode;
	import away3d.animators.nodes.ParticleRotateToHeadingNode;
	import away3d.animators.nodes.ParticleRotationalVelocityNode;
	import away3d.animators.nodes.ParticleTimeNode;
	import away3d.animators.nodes.ParticleVelocityNode;
	import away3d.core.base.Geometry;
	import away3d.entities.Mesh;
	import away3d.materials.TextureMaterial;
	import away3d.materials.lightpickers.StaticLightPicker;
	import away3d.primitives.PlaneGeometry;
	import away3d.tools.helpers.ParticleGeometryHelper;
	import away3d.tools.helpers.data.ParticleGeometryTransform;
	import away3d.utils.Cast;
	
	public class Rainleaves
	{
		
		
		private var particleAnimator:ParticleAnimator
		private var particleMesh:Mesh;
		private var lipc:StaticLightPicker;
		private var _alpha:Number;
		public var x:Number;
		public var y:Number;
		public var z:Number;
		public var scale:Number;
		public var Num:Number;
		
		
		private var he:Number;
		public function Rainleaves(_num=10000,lipicker:StaticLightPicker=null,alpha=1)
		{
			_alpha=alpha;
			lipc=lipicker;
			
			Num=_num;
			x=y=z=0;
			scale=1;
			ini();
		}
		public function start():void{//默认调用
			if(particleAnimator)particleAnimator.start();
		}
		public function stop():void{
			if(particleAnimator)particleAnimator.stop();
		}
		private function ini():void
		{
			// TODO Auto Generated method stub
			
			var geometry:Geometry = new PlaneGeometry(150,150,1,1,true,true);
			var geometrySet:Vector.<Geometry> = new Vector.<Geometry>;
			var transforms:Vector.<ParticleGeometryTransform> = new Vector.<ParticleGeometryTransform>();
			var scale:Number;
			var vertexTransform:Matrix3D;
			var particleTransform:ParticleGeometryTransform;
			for (var i:int = 0; i < Num; i++)
			{
				geometrySet.push(geometry);
				particleTransform = new ParticleGeometryTransform();
				scale = Math.random()  + 1;
				vertexTransform = new Matrix3D();
				vertexTransform.appendScale(scale, scale, scale);
				particleTransform.vertexTransform = vertexTransform;
				transforms.push(particleTransform);
			}
			
			var particleGeometry:Geometry = ParticleGeometryHelper.generateGeometry(geometrySet,transforms);
			
			
			var particleAnimationSet:ParticleAnimationSet = new ParticleAnimationSet(true, true,true);
			
			particleAnimationSet.addAnimation(new ParticleVelocityNode(ParticlePropertiesMode.GLOBAL, new Vector3D(0, -1000, 0)));
			particleAnimationSet.addAnimation(new ParticlePositionNode(ParticlePropertiesMode.LOCAL_STATIC));
			particleAnimationSet.addAnimation(new ParticleOscillatorNode(ParticlePropertiesMode.LOCAL_STATIC));
			particleAnimationSet.addAnimation(new ParticleRotationalVelocityNode(ParticlePropertiesMode.LOCAL_STATIC));
			particleAnimationSet.addAnimation(new ParticleBezierCurveNode(ParticlePropertiesMode.GLOBAL,new Vector3D(0,0,2000)));
			
			particleAnimationSet.initParticleFunc = initParticleFunc;
		
			var material:TextureMaterial =new TextureMaterial(Cast.bitmapTexture(new LEAVES));
			material.alphaBlending=true;
			material.mipmap=true;
			if(lipc!=null){	material.lightPicker = lipc;}
			material.alpha=_alpha;
			particleMesh = new Mesh(particleGeometry, material);
			particleMesh.bounds.fromSphere(new Vector3D(), 20000);//绑定体积，为了防止垃圾回收系统在可视范围清除粒子
			
			particleAnimator = new ParticleAnimator(particleAnimationSet);
			particleMesh.animator = particleAnimator;
			particleAnimator.start();
			particleAnimator.resetTime(-10000);
			//trace("粒子gpu系统加速"+particleAnimationSet.usesCPU)
			Cry.scene.addChild(particleMesh);
		}		
		
		private function initParticleFunc(param:ParticleProperties):void
		{
			// TODO Auto Generated method stub
			param.startTime = Math.random()*8;
			param.duration = 7;
		
			param[ParticleOscillatorNode.OSCILLATOR_VECTOR3D] = new Vector3D(Math.random() * 1300 - 100, 0, Math.random() * 600 -500, Math.random() * 2 + 3);
		
			param[ParticlePositionNode.POSITION_VECTOR3D] =ProvScene();
			param[ParticleRotationalVelocityNode.ROTATIONALVELOCITY_VECTOR3D] = new Vector3D(Math.random(), Math.random(), Math.random(), Math.random() * 4 + 4);
			
			param[ParticleOrbitNode.ORBIT_VECTOR3D]=new Vector3D(0,Math.random()*3000,2000);
			//trace("sssssssssssssssssssssssssssssssssssssssssssssssssssssssssss"+param.index);
			
		}
		
	
	
		private function ProvScene():Vector3D{//设置区域
		
			var sc:Vector3D;
			var _x:Number,_y:Number,_z:Number;
			_x=scale*(x+Math.random() * 100000 - 50000);
			_y=y+scale*1200;
			_z=scale*(z+Math.random() * 6000);
			sc=new Vector3D(_x,_y,_z);
			return sc;
		}
		
	}}

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