Parameters
- originPnt
- the original panning point, in view coordinates
- viewPnt
- the current mouse point, in view coordinates
This uses the same mechanisms as DoAutoScroll -- do not try to auto-scroll and auto-pan at the same time. Automatic panning occurs in the area outside of the region specified by AutoPanRegion surrounding the originPnt.
This is normally called from GoToolPanning.GoToolPanning.DoMouseMove.