To zoom the map in my program, I repeatedly call WinInvertRectangleFrame to draw a zoom rectangle that follows the stylus until the user lifts the stylus (and the map gets zoomed). But on a Tungsten 3 (and only on a T3), starting the zoom rectangle in the upper right corner of the desired area and moving the stylus bottomward and leftward, the rectangle frame horizontal lines do not show. Is there a solution to this?
Before you assume it is a device or API bug, have you tried using the debugger and the simulator to make sure you're inverting the correct coordinates, etc.?
Debugging pen-related actions can be difficult since hitting a breakpoint messes up pen tracking. I find it most useful to send trace information to Reporter: try logging the coordinates which you're inverting (e.g. HostTraceTL("inverting %hd %hd %hd %hd",rect.topLeft.x, etc.), putting in pauses after each invert so you are sure you're not doubly-inverting (which would do nothing), etc.
And just a thought: if you only get the bug when dragging from the upper right corner, perhaps you're passing a negative extent value for the rectangle? I don't know off the top of my head whether that's meant to work or not. Try making sure the values are all positive.
-David Fedor PalmSource, Inc.
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