package com.somethingcolorful.environment.plant.tree
{
	import org.papervision3d.core.geom.Lines3D;
	import org.papervision3d.core.geom.renderables.Line3D;
	import org.papervision3d.core.geom.renderables.Vertex3D;
	import org.papervision3d.materials.special.LineMaterial;
	import org.papervision3d.objects.DisplayObject3D;
	
	public class TreeBranch extends DisplayObject3D
	{
		
		private var toX:Number = 0
		private var toY:Number = 0
		private var toZ:Number = 0;
		private var rad:Number = 15;
		private var ang:Number = 0;
		private var MAX_THICKNESS:Number = 5;
		private var counter:int = 0;
		private var defMat:LineMaterial;
		private var limb:Lines3D;
		private var branches:Array = new Array();
		public function TreeBranch(name:String,x:int,y:int,z:int,r:int)
		{
			super();
			this.x = x;
			this.y = y;
			this.z = z;
			this.rad = r;			

			defMat = new LineMaterial(0x5E3017, 1);
			limb = new Lines3D(defMat, name);
			
			addChild( limb );	
		}
			
		
		public function update() : void
		{
			if(rad > 0){				
				var t:Number = MAX_THICKNESS-rad+1;
			
				var fromX:Number = toX;
				var fromY:Number = toY;
				var fromZ:Number = toZ;
				
				ang += Math.PI/180*(random(t*16+10)-(t*8+5));
				//ang += Math.min(10,Math.max(-10,(random(30)+3)))/180*Math.PI;
				toY -= 10;
				toX -= (toY-fromY)*Math.cos(ang);
				toZ -= (toY-fromY)*Math.sin(ang);
				rad -= .1;

				limb.addLine( new Line3D( limb, defMat, rad, new Vertex3D(toX,toY,toZ), new Vertex3D( fromX,fromY,fromZ ) ));		
				
				var n:int = branches.length;
				for(var i:int=0;i<n;i++){
					branches[i].update();
				}
				
				if(counter == 31){
					trace("add new branch");
					var b:TreeBranch = new TreeBranch('child',fromX,fromY,fromZ,rad)
					b.rotationY = random(360); 
					b.rotationX = random(180)-90; 
					branches.push(b);
					addChild(b);
					counter=0;
				}
				
				counter++;
			} 
		}
		
		private function random(v:Number) : Number
		{
			return Math.random() * v;
		}

	}
}