code: public int add( float srcX , float srcY , float dstX , float dstY )
  	{
  		int which = addControl(srcX,srcY);
  		setUndistorted(which,dstX,dstY);
  		return which;
  	}
docs: Function that let's you set control and undistorted points at the same time
  @param srcX distorted coordinate
  @param srcY distorted coordinate
  @param dstX undistorted coordinate
  @param dstY undistorted coordinate
  @return Index of control point