@staticmethod
def intersection_point(center_x, center_y, source_x, source_y, width,
    height=None):
    """Determines where the triangle centered at (center_x, center_y)
        intersects with a line drawn from (source_x, source_y) to
        (center_x, center_y).

        @see: ShapeDrawer.intersection_point"""
    height = height or width
    return center_x, center_y
