(self, x, y=None)
From position in the projection plane to image array index (%s).

        Input:
          - x : if y is None, x[0], x[1] define the position in %s plane.
          - y : if defined, x,y define the position in projection plane.
          - projinfo : additional projection information.

        Return:
          - i,j : image array indices.
From position in the projection plane to image array index (%s).
From position in the projection plane to image array index ( %s ) .
def xy2ij(self, x, y=None):
        """From position in the projection plane to image array index (%s).

        Input:
          - x : if y is None, x[0], x[1] define the position in %s plane.
          - y : if defined, x,y define the position in projection plane.
          - projinfo : additional projection information.

        Return:
          - i,j : image array indices.
        """
        pass
def xy2ij ( self , x , y = None ) : pass