A weird trig motion problem

programming flash
1

Hey guys,

The problem is that when i rotate(left/right key) my ship i’m getting acceleration which should only occur when the thruster is firing(up Key).

I’m using a standard motion model and im using it in a model view controller pattern which may or may not be the problem.

Here’s the movement model and I would be happy to email you the swf:

package
{
	import flash.events.Event;
	import flash.events.EventDispatcher;
	
	public class AsteroidSupplyMovementModel extends EventDispatcher 
	{ 
		private var _rotation:Number=0;
		private var _rVel:Number=0;
		private var _yAcc:Number=0;
		private var _angle:Number=0;
		private var _thrust:Number=0;
		private var _gravity:Number=.098;
		private var _xAcc:Number=0;
		private var _yVel:Number=0;
		private var _xVel:Number=0;
		
		public function AsteroidSupplyMovementModel():void
		{
			
		}
		public function update():void
		{
			
			 _rotation += _rVel; //increases\decreses rotation(from keyboard)
			
			 if(Math.abs(_rVel)<.03)//rVelSpeedTrap;
			 {
				 _rVel=0;
			 }
			
			_angle=_rotation*(Math.PI/180);
			
			_yAcc=Math.cos(_angle) * _thrust;//+_gravity;//thrust+gravity;
			_xAcc=Math.sin(_angle)  * _thrust;
			
			_yVel +=_gravity;
			_yVel+=_yAcc;
			_xVel-=_xAcc;
			_yVel =_yVel*.98;
			_rVel =_rVel*.8;
			
		}
		
		public function get rVel():Number 
		{
			return(Math.ceil( _rVel));
		}
		
		public function set rVel(value:Number):void 
		{
			_rVel = Math.ceil(rVel);
			_rVel = value;
			dispatchEvent(new Event(Event.CHANGE));
		}
		
		public function get thrust():Number 
		{
			return _thrust;
		}
		
		public function set thrust(value:Number):void 
		{
			_thrust = value;
			dispatchEvent(new Event(Event.CHANGE));
		}
		
		public function get rotation():Number 
		{
			return _rotation;
		}
		
		public function get xVel():Number 
		{
			return _xVel;
		}
		
		public function get yVel():Number 
		{
			return _yVel;
			
		}
		
		public function set yVel(value:Number):void 
		{
			_yVel = value;
			dispatchEvent(new Event(Event.CHANGE));
		}
		
		public function set xVel(value:Number):void 
		{
			_xVel = value;
			dispatchEvent(new Event(Event.CHANGE));
		}
		//public function get angle():Number
//		{
//			_angle = _rotation * (Math.PI / 180);
//			return _angle
//		}
		
	}
	
}