Bind fun to mouse-move-event (with pressed mouse button) on turtle. fun must be a function with two arguments, the coordinates of the actual mouse position on the canvas. num, the number of the mouse-button defaults to 1 Every sequence of mouse-move-events on a turtl
(self, item, fun, num=1, add=None)
| 629 | eventfun, add) |
| 630 | |
| 631 | def _ondrag(self, item, fun, num=1, add=None): |
| 632 | """Bind fun to mouse-move-event (with pressed mouse button) on turtle. |
| 633 | fun must be a function with two arguments, the coordinates of the |
| 634 | actual mouse position on the canvas. |
| 635 | num, the number of the mouse-button defaults to 1 |
| 636 | |
| 637 | Every sequence of mouse-move-events on a turtle is preceded by a |
| 638 | mouse-click event on that turtle. |
| 639 | """ |
| 640 | if fun is None: |
| 641 | self.cv.tag_unbind(item, "<Button%s-Motion>" % num) |
| 642 | else: |
| 643 | def eventfun(event): |
| 644 | try: |
| 645 | x, y = (self.cv.canvasx(event.x)/self.xscale, |
| 646 | -self.cv.canvasy(event.y)/self.yscale) |
| 647 | fun(x, y) |
| 648 | except Exception: |
| 649 | pass |
| 650 | self.cv.tag_bind(item, "<Button%s-Motion>" % num, eventfun, add) |
| 651 | |
| 652 | def _onscreenclick(self, fun, num=1, add=None): |
| 653 | """Bind fun to mouse-click event on canvas. |
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