extract from RealTimeStylusPluginApp.cs (TPC SDK 1.7)

// Create the PacketFilterPlugin
// Note that this custom plugin takes a rectangle in
// ink space coordinates (.01mm = 1 ink space unit), which
// specifies the filter region. This sample uses a rectangle
// that is centered over the drawing area.
float right =
((float)gbTestArea.Width*2540.0F)/(float)customDynamicRendererGraphics.DpiX;
float bottom =
((float)gbTestArea.Height*2540.0F)/(float)customDynamicRendererGraphics.DpiY;

My question:
The Ink coordinates ratio given in this sample is 2540 on the horizontal
axis.

When asking through the IInkTablet COM object, the resolution returned is
3678,54541015625 (HIMETRICS= inches) with coordinates ranging from 0 to
30348, which results in an horizontal size of 8,25 inches for the screen
(30348 / 3678,...).
Using the 2540 value, the size (30348/2540) is 11,95 inches, which is the
very size I measure on the screen.

The second trouble is that when I move the pen at the edges of the screen,
the maximum value returned is 27093 (horizontally) and not 30348 (With an
IInkOverlay COM Object attached to a full screen window; attachmode=infront).

Did I misunderstood something about ratios or I am missing something ?
Can anybody give me some clue ?
Thanks,

Hi David,

what TabletPC model are you using? On my Lenovo x60, the resolution gets
returned as 2540 and the math matches what I measure on the screen.

Thanks,
Stefan