sound3d.as.svn-base

一个2D基于verlet的Flash物理引擎。它用AS3编写而成。Fisix的目标是应用到游戏等计算量很大的实时应用中。尽管flash比c/c++要慢,很棒的物理引擎

package org.papervision3d.objects.special
{
	import org.papervision3d.Papervision3D;
	
	import org.papervision3d.core.Number3D;
	import org.papervision3d.core.Matrix3D;
	
	import org.papervision3d.core.proto.CameraObject3D;
	
	import flash.media.Sound;
	import flash.media.SoundChannel;
	import flash.media.SoundTransform;
	import flash.net.URLRequest;
	
	import flash.display.Sprite;
	
	
	public class Sound3D extends DisplayObject3D {
		
		//any sound object
		public var sound:Sound;
		
		//This is used for sound via SoundChannel, FLV or video to be transformed.
		public var soundChannel:*;
		
		//maximum distance the sound can travel
		public var maxSoundDistance:Number;
		
		/*
		* This is used to control the volume and could also be used to control the pitch and/or fader  
		* if a sound engine that supports it is used. It puts out values from -1 to 1. Values from 0 to -1 is 
		* when the object is behind the camera.
		*/
		public var soundDistance       :Number;
		
		
		//Controls the pan. It puts out values from -1 to 1.
		public var soundPan       :Number;
		
		//Works only for sound
		public function play(startTime:Number = 0, loops:int = 0, sndTransform:SoundTransform = null):void
		{
			soundChannel = sound.play(startTime, loops, sndTransform);
			setVolume(0);
			setPan(0);
		}
		
		public function stop(startTime:Number = 0, loops:int = 0, sndTransform:SoundTransform = null):void
		{
			soundChannel.stop();
		}
		
		private function setPan(pan:Number):void {
			var transform:SoundTransform = soundChannel.soundTransform;
			transform.pan = pan;
			soundChannel.soundTransform = transform;
		}
	
		private function setVolume(volume:Number):void {
			var transform:SoundTransform = soundChannel.soundTransform;
			transform.volume = volume;
			soundChannel.soundTransform = transform;
		}
		
		
		
		//Controls the 3d position of the sound
		public function updateSound ( camera:CameraObject3D ):void
		{
			var dist:Number;
			var newX:Number = this.world.n14 - camera.x;
			var newY:Number = this.world.n24 - camera.y;
			var newZ:Number = this.world.n34 - camera.z;
			if(!maxSoundDistance) maxSoundDistance = 4000;
			var Sdist:Number = Math.sqrt(newX*newX+newY*newY+newZ*newZ);
			var Angle:Number = int(Math.atan(newX/newZ)*180/Math.PI) - camera.rotationY;
			
			if (Angle>359) Angle = (Angle%360);
			else if(Angle<=0) Angle = 360+(Angle%360);
			
			if (newZ<0) Angle = ((Angle)+180)%360;
			else if(newZ>0) Angle = Angle;
			
			if (Sdist<=maxSoundDistance) dist = 1-(Sdist/maxSoundDistance);
			else dist = 0;
			
			var ang:Number = Angle - 179;
			var Pan:Number = (ang - 180)/180;
			
			if ( ang >= -180 && ang <= 0) Pan = ((ang + 180)/90); //left ear
			else if (ang<179 && ang>0) Pan = ((ang - 179)/90); //right ear
			
			if(Pan<-1) Pan = -(Pan%1 + 1);
			else if(Pan>1) Pan = .99 - (Pan%1);
			
			soundPan = Pan;
			soundDistance = dist*(view.n34/Math.abs(view.n34));
			
			if(soundChannel){
				setVolume(Math.abs(soundDistance));
				setPan(soundPan);
			}
		}
		
		public function Sound3D( soundObj:Sound=null ):void
		{
			if(soundObj){
				this.sound = soundObj;
				//this.soundChannel = new SoundChannel();
			}
		}
		
		public override function project( parent :DisplayObject3D, camera :CameraObject3D, sorted :Array=null ):Number
		{
			//if( ! sorted ) this._sorted = sorted = new Array();
	
			if( this._transformDirty ) updateTransform();
			
			calculateScreenCoords( camera );
			
			if (soundChannel) updateSound(camera);//Updates 3D Sound
	
			this.view.calculateMultiply( parent.view, this.transform );
			this.world.calculateMultiply( parent.world, this.transform );
			
			var screenZs :Number = 0;
			var children :Number = 0;
	
			return this.screenZ = screenZs / children;
		}
		
		private function calculateScreenCoords( camera :CameraObject3D ):void
		{
			var persp:Number = (camera.focus * camera.zoom) / (camera.focus + view.n34);
			screen.x = view.n14 * persp;
			screen.y = view.n24 * persp;
			screen.z = view.n34;
		}	
	}
}