def scroll_event_windows(self, event):
<EOL>w = event.widget.winfo_containing(event.x_root, event.y_root)<EOL>if w == self._tkcanvas:<EOL><INDENT>x = event.x_root - w.winfo_rootx()<EOL>y = event.y_root - w.winfo_rooty()<EOL>y = self.figure.bbox.height - y<EOL>step = event.delta/<NUM_LIT><EOL>FigureCanvasBase.scroll_event(self, x, y, step, guiEvent=event)<EOL><DEDENT>
MouseWheel event processor