这里明确说/ Here explicitly say:
If you set Zoom Style to Zoom to Rectangle in the Edit Graph dialog box or set the
ATTR_ZOOM_STYLE control attribute to VAL_ZOOM_TO_RECT, users can define a rectangular zone that will become the new limits of the graph. To select these bounds, press <Ctrl> and click and hold the left mouse button to define the first corner of the box. Drag the mouse to define the opposite corner of the rectangle. When you are satisfied with the new boundaries of the graph, release the mouse button.So, I need only setup to Zoom to Rectangle , don't need write any programming code , really ? This is great function .
But I cann't still zooming and panning . Why ?
按说只要设置一下即可，是吗？很诱人的功能，可我的为何不行呢？
Thank you。 谢谢。