Retrieves and sets digitizer (tablet) calibrations
(tablet code [row1 row2 row3 direction])
An integer that can be one of the following:
0â€ƒReturn the current digitizer calibration. In this case, the remaining arguments must be omitted.
1â€ƒSet the calibration according to the arguments that follow. In this case, you must provide the new calibration settings (row1,row2,row3, and direction).
Three 3D points. These three arguments specify the three rows of the tablet's transformation matrix.
tablet returns it as 1 even if you specify a different value in row3.The third element in row3 (Z) should always equal 1:
One 3D point. This is the vector (expressed in the world coordinate system, or WCS) that is normal to the plane that represents the surface of the tablet.
tablet corrects it, so the direction it returns when you set the calibration may differ from the value you passed.If the specified direction isn't normalized,
tablet fails, it returns nil and sets the ERRNO system variable to a value that indicates the reason for the failure (see in theAutoLISP Developer's Guide ). This can happen if the digitizer is not a tablet.If
tablet is the identity transformation:A very simple transformation that can be established with
(tablet 1 '(1 0 0) '(0 1 0) '(0 0 1) '(0 0 1))
With this transformation in effect, AutoCAD will receive, effectively, raw digitizer coordinates from the tablet. For example, if you pick the point with digitizer coordinates (5000,15000), AutoCAD will see it as the point in your drawing with those same coordinates.
The TABMODE system variable allows AutoLISP routines to toggle the tablet on and off.
topic in the AutoLISP Developer's Guide .The