Well, the way I understand it, the hardware that reads the pen taps maintains a coordinate system that is separate from the display coordinates - that is the coordinates of the entire display. For example, if I tap the pen at the bottom center of my form, I get pen coordinates that are at (26, -41). The same area in display coordinates would be roughly (80, 150).
From the Palm OS documentation:
"EvtGetPen returns a pen sample using the standard coordinate system, relative to the draw window".
Usually, the draw window is the whole screen, but it can be redefined by set-draw window. You can use WinGetDrawWindowBounds to get the origin coordinates of the drawing window.
-- Ben Combee, Senior Software Engineer, palmOne, Inc. "Combee on Palm OS" weblog: http://palmos.combee.net/ Developer Forum Archives: http://news.palmos.com/read/all_forums/
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