Qt-embedded-interest Archive, March 2002
Calibrate file format
Message 1 in thread
/etc/pointercal contains 7 data values separated by spaces
The second and fourth values are both zero. The seventh value is 65536, which
is used to scale up the calculations.
(1) This is the ratio of the screen width to the device width times the
scalar... or,
( screen_topLeft_x - screen_bottomRight_x )
------------------------------------------- * 65536
( device_topLeft_x - device_bottomRight_x )
(3) This uses the ratio in (1) to calculate the screen X offset.
65536 * screen_topLeft_x - (1) * device_topLeft_x
The remaining two values are the same ideas as above, only applied to height:
(5) is equivalent to (1), except replace "width" with "height" and "x" with "y"
(6) is equivalent to (3), except replace "width" with "height," "x" with "y,"
and "(1)" with "(5)."
The source code for writing to /etc/pointercal is in
$QTDIR/src/kernel/qwsmouse_qws.cpp. (See QCalibratedMouseHandler::calibrate(
QWSPointerCalibrationData *cd ) for this information )
I'm CC:'ing this e-mail to the qt-embedded-interest mailing list since someone
might find it interesting, and since I'd asked earlier and not received a
response (I'm going to assume because nobody who had time to respond knew, and
not because it was an idiotic question, although generally the latter
assumption is safer whenever I'm involved.)
--
[ signature omitted ]
