Device Access and Control
Device Access and Control
Calibrating Tablets
The grread function returns raw user input, whether from the keyboard or from the pointing device (mouse or digitizer). If the call to grread enables tracking, the function returns a digitized coordinate that can be used for things such as dragging.
NoteThere is no guarantee that applications
calling grread will
be upward compatible. Because it depends on the current hardware
configuration, applications that call grread are
not likely to work in the same way on all configurations.