package
{
	import away3d.extrusions.ElevationReader;
 
	import flash.events.KeyboardEvent;
 
	import mx.core.Application;
 
	public class MoveableCamera extends BaseObject
	{
		protected static const MOVESPEED:Number = 100;
		protected static const TURNSPEED:Number = 90;
		protected var forward:Boolean = false;
		protected var backward:Boolean = false;
		protected var turnLeft:Boolean = false;
		protected var turnRight:Boolean = false;
		protected var elevationreader:ElevationReader = null;
 
		public function MoveableCamera()
		{
			super();
		}
 
		public function startupMoveableCamera(engineManager:EngineManager):MoveableCamera
		{
			super.startupBaseObject(engineManager);
 
			Application.application.stage.addEventListener(KeyboardEvent.KEY_DOWN, keyDown);
			Application.application.stage.addEventListener(KeyboardEvent.KEY_UP, keyUp);
 
			elevationreader = new ElevationReader(0);
			elevationreader.traceLevels(engineManager.MyResourceManager.HeightmapTex,
	                            "r",
	                           ApplicationManager.SUBDIVIDE_X,
	                           ApplicationManager.SUBDIVIDE_Y,
	                           ApplicationManager.SCALE_X,
	                           ApplicationManager.SCALE_Y,
	                           ApplicationManager.SCALE_Z);
 
			return this;
		}
 
		protected function keyDown(event:KeyboardEvent):void
		{
			if (event.keyCode == 38)
			{
				this.forward = true;
			}
			else if (event.keyCode == 40)
			{
				this.backward = true;
			}
			else if (event.keyCode == 39)
			{
				this.turnRight = true;
			}
			else if (event.keyCode == 37)
			{
				this.turnLeft = true;
			}
		}
 
		protected function keyUp(event:KeyboardEvent):void
		{
			if (event.keyCode == 38)
			{
				this.forward = false;
			}
			else if (event.keyCode == 40)
			{
				this.backward = false;
			}
			else if (event.keyCode == 39)
			{
				this.turnRight = false;
			}
			else if (event.keyCode == 37)
			{
				this.turnLeft = false;
			}
		}
 
		public override function enterFrame(dt:Number):void
		{
			if (this.forward)
				this.engineManager.cam.moveForward(MOVESPEED * dt);
			else if (this.backward)
				this.engineManager.cam.moveBackward(MOVESPEED * dt);
 
			if (this.turnLeft)
				this.engineManager.cam.rotationY -= TURNSPEED * dt;
			else if (this.turnRight)
				this.engineManager.cam.rotationY += TURNSPEED * dt;
 
			this.engineManager.cam.y = elevationreader.getLevel(this.engineManager.cam.x, -this.engineManager.cam.z, 0);
		}
	}
}