'Draw the transform xf on the screen'

def DrawTransform(self, xf):

    p1 = xf.position
    p2 = self.to_screen((p1 + (self.axisScale * xf.R.x_axis)))
    p3 = self.to_screen((p1 + (self.axisScale * xf.R.y_axis)))
    p1 = self.to_screen(p1)
    pygame.draw.aaline(self.surface, (255, 0, 0), p1, p2)
    pygame.draw.aaline(self.surface, (0, 255, 0), p1, p3)
