updates internal state of object to move it dx,dy units
(self, dx, dy)
| 523 | pass # must override in subclass |
| 524 | |
| 525 | def _move(self, dx, dy): |
| 526 | """updates internal state of object to move it dx,dy units""" |
| 527 | pass # must override in subclass |
| 528 | |
| 529 | class Point(GraphicsObject): |
| 530 | def __init__(self, x, y): |