(self, x, y)
Converts local coordinates to the context coordinate system (given
        by the bounding box).

        This method must be overridden in derived classes.
Converts local coordinates to the context coordinate system (given
        by the bounding box).
Converts local coordinates to the context coordinate system ( given by the bounding box ) .
def local_to_context(self, x, y):
        """Converts local coordinates to the context coordinate system (given
        by the bounding box).

        This method must be overridden in derived classes."""
        raise NotImplementedError("abstract class")
def local_to_context ( self , x , y ) : raise NotImplementedError ( "abstract class" )