How to get absolute position of shape in PowerPoint add-in?

I'm writing plugin for MS PowerPoint using C#. I need to get position each PPT shape in screen coordinates when presentation is running. How it can be obtained?

I have position of presentation viewer window 开发者_运维百科and have shape position relative to top-left corner of the slide. But I haven't position of the slide relative to pesentation viewer.

Each shape's .Top, .Left, .Height and .Width properties will tell you the position and size of the shape relative to the size of the PPT slide.

A few questions down there are some suggestions for getting the screen coordinates of the current slide show window.

In a dual-monitor system, finding out on which monitor a PowerPoint slideshow is displayed

Once you have both of those bits, the rest should be a simple ratio calculation.