(self, theta, phi=None, lonlat=False, direct=False)
From angular direction to position in the projection plane (%s).

        Input:
          - theta: if phi is None, theta[0] contains theta, theta[1] contains phi
          - phi  : if phi is not None, theta,phi are direction
          - lonlat: if True, angle are assumed in degree, and longitude, latitude
          - flipconv is either 'astro' or 'geo'. None will be default.
        Return:
          - x, y: position in %s plane.
From angular direction to position in the projection plane (%s).
From angular direction to position in the projection plane ( %s ) .
def ang2xy(self, theta, phi=None, lonlat=False, direct=False):
        """From angular direction to position in the projection plane (%s).

        Input:
          - theta: if phi is None, theta[0] contains theta, theta[1] contains phi
          - phi  : if phi is not None, theta,phi are direction
          - lonlat: if True, angle are assumed in degree, and longitude, latitude
          - flipconv is either 'astro' or 'geo'. None will be default.
        Return:
          - x, y: position in %s plane.
        """
        pass
def ang2xy ( self , theta , phi = None , lonlat = False , direct = False ) : pass