anchor.diff:     */
     num accelerationY = 0;
   
  +  /**
  +   * The maximum speed limit for the Sprite.
  +   */
  +  num maxSpeed = 0;
  +
  +  /**
  +   * The minimum speed limit for the Sprite.
  +   */
  +  num minSpeed = 0;
  +
     StageXL.Vector mainDirection = new StageXL.Vector.zero();
  +
  +  StageXL.Vector accelerationDirection = new StageXL.Vector.zero();
   
     StageXL.Vector upDirection = new StageXL.Vector(0, -1);
     StageXL.Vector downDirection = new StageXL.Vector(0, 1);
  
positive.code: 
    bool checkWorldBounds = false;
  
    bool killOutOfBounds = false;
  
    /**
  
negative.code: 
    State _context;
  
    num _accelerationScale = 0;
  
    /**
     * Does the sprite move?
     */
  