On Wed, Nov 16, 2016 at 04:41:55PM +0100, Jens Harms wrote: > Hello, i created a simple calibration widget to calculate the CTM but > xinput refused to apply the CTM. > When i start X without any X Application running and then (over ssh shell) > type > > xinput set-prop 'my touch' 'Coordinate Transformation Matrix' a b c d e f g > h i > > without any error, NOTHING happens. no error, no change to the property. > > BUT: when I start X, then aterm and after the aterm window is visible, > i can succesfully apply the matrix with "xinput set-prop 'my touch' > 'Coordinate Transformation Matrix' a b c d e f g h i" > > Is this intended behavior?
probably. By default the X server resets after the last client disconnects and starts with a vanilla state. Try the -noreset flag to Xorg, or keep one client connected enough until the rest of the desktop starts. Cheers, Peter > > re, > Jens Harms > > For the curious, i uploaded the full source: > > git clone https://github.com/xtforever/xtcal.git > > you can add as many calibration points as you wish, the least sqare > algo will calculate the correct matrix. > > > 2016-10-20 7:52 GMT+02:00 Peter Hutterer <[email protected]>: > > > On Wed, Oct 19, 2016 at 03:52:56PM +0200, Jens Harms wrote: > > > 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? > > > > don't use the axis calibration, use the matrix only. > > > > > How are Touch coordinates calculated? Which transformations are applied > > to > > > the raw data? > > > > the matrix is a basic transformation matrix, so you can use your normal > > rotational elements, etc. The values are normalized to [0, 1] where 1 > > represents "total width" or "total height". > > > > https://wiki.archlinux.org/index.php/Calibrating_Touchscreen > > https://wiki.ubuntu.com/X/InputCoordinateTransformation > > > > Cheers, > > Peter > > > _______________________________________________ > [email protected]: X.Org development > Archives: http://lists.x.org/archives/xorg-devel > Info: https://lists.x.org/mailman/listinfo/xorg-devel _______________________________________________ [email protected]: X.Org development Archives: http://lists.x.org/archives/xorg-devel Info: https://lists.x.org/mailman/listinfo/xorg-devel
