calibrate touchscreen

[Jens Harms]

Hi. I try to calibrate  a resisitive Touchscreen.
The touchscreen is a bit rotatated (3-5 degree), therefore i can not use
xinput_calibrator. I try to understand how the the evdev driver works.

Do i need to set "Evdev Axis Calibration" and "Coordinate Transformation
Matrix" ? Or is it sufficent to set the CTM alone?

How are Touch coordinates calculated? Which transformations are applied to
the raw data?

Regards,
jens
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