anchor.diff:  	Point velocity;
   	Point target;
   	Point position;
  +	Point fleeTarget;
   	num mass = 20;
   	num MAX_FORCE = 3;
  -	num MAX_VELOCITY = 2;
  +	num MAX_VELOCITY = 1;
   	num SLOWING_RADIUS = 200;
   	num CIRCLE_DISTANCE = 4;
   	num CIRCLE_RADIUS = 20;
  
positive.code:     	alpha = 0.9;
      	velocity = new Point(MAX_VELOCITY, MAX_VELOCITY);
      	truncate(velocity, MAX_VELOCITY);
      	
  		onEnterFrame.listen((_)
  		{
  
negative.code: 		return force;
  	}
  	
  	Point flee(Point fleeTarget)
  	{
  		Point desired = position.subtract(fleeTarget);
  		scaleBy(desired, MAX_VELOCITY);
  		Point force = desired.subtract(velocity);
  		return force;
  	}
  	
  	void normalize(Point point)
  	{
  		double l = sqrt(point.x * point.x + point.y * point.y);
  