Xinput coordinate transformation matrix

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I am trying to calibrate a 3.5" pitft touchscreen on a Raspberry Pi 3 using xinput.



I have the display rotated so it uses a landscape orientation, with the power connector facing "up" so it can rest on my desk - this means a 270 degree rotation from default. The first challenge was rotating the input to match the screen orientation, which I acheived with:



xinput --set-prop 'stmpe-ts' 'Coordinate Transformation Matrix' 0 -1 1 1 0 0 0 0 1


Now I need to match my touch area to the screen area - currently it uses only the inner 80% or so, so as touches move out from center they become increasingly inaccurate, and things like a scrollbar on the screen edge are completely unreachable.



How can I adjust the command above to calibrate touch area size and offset, without losing my rotation or introducing shear, and without going back to school for a linear algebra degree?



update



I found this:



https://wiki.archlinux.org/index.php/Talk:Calibrating_Touchscreen



which talks about using xinput_calibrator to generate a transformation matrix. Unfortunately none of the scripts referenced there actually work - they don't appear to take rotation into consideration. The calibrator tool on it's own generates something like this:



Section "InputClass"
Identifier "calibration"
MatchProduct "stmpe-ts"
Option "MinX" "24507"
Option "MaxX" "24507"
Option "MinY" "43599"
Option "MaxY" "43599"
Option "SwapXY" "1" # unless it was already set to 1
Option "InvertX" "0" # unless it was already set
Option "InvertY" "0" # unless it was already set
EndSection


The scripts on that wiki are able to get me a matrix like this:



-144.03296703296703296703 0 52.63736263736263736263 
0 -49.08988764044943820224 33.53333333333333333333
0 0 1


But that seems to still be a bit off, and comparing to the "simple" rotation above seems to be conspicuously missing some values.










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    0















    I am trying to calibrate a 3.5" pitft touchscreen on a Raspberry Pi 3 using xinput.



    I have the display rotated so it uses a landscape orientation, with the power connector facing "up" so it can rest on my desk - this means a 270 degree rotation from default. The first challenge was rotating the input to match the screen orientation, which I acheived with:



    xinput --set-prop 'stmpe-ts' 'Coordinate Transformation Matrix' 0 -1 1 1 0 0 0 0 1


    Now I need to match my touch area to the screen area - currently it uses only the inner 80% or so, so as touches move out from center they become increasingly inaccurate, and things like a scrollbar on the screen edge are completely unreachable.



    How can I adjust the command above to calibrate touch area size and offset, without losing my rotation or introducing shear, and without going back to school for a linear algebra degree?



    update



    I found this:



    https://wiki.archlinux.org/index.php/Talk:Calibrating_Touchscreen



    which talks about using xinput_calibrator to generate a transformation matrix. Unfortunately none of the scripts referenced there actually work - they don't appear to take rotation into consideration. The calibrator tool on it's own generates something like this:



    Section "InputClass"
    Identifier "calibration"
    MatchProduct "stmpe-ts"
    Option "MinX" "24507"
    Option "MaxX" "24507"
    Option "MinY" "43599"
    Option "MaxY" "43599"
    Option "SwapXY" "1" # unless it was already set to 1
    Option "InvertX" "0" # unless it was already set
    Option "InvertY" "0" # unless it was already set
    EndSection


    The scripts on that wiki are able to get me a matrix like this:



    -144.03296703296703296703 0 52.63736263736263736263 
    0 -49.08988764044943820224 33.53333333333333333333
    0 0 1


    But that seems to still be a bit off, and comparing to the "simple" rotation above seems to be conspicuously missing some values.










    share|improve this question


























      0












      0








      0








      I am trying to calibrate a 3.5" pitft touchscreen on a Raspberry Pi 3 using xinput.



      I have the display rotated so it uses a landscape orientation, with the power connector facing "up" so it can rest on my desk - this means a 270 degree rotation from default. The first challenge was rotating the input to match the screen orientation, which I acheived with:



      xinput --set-prop 'stmpe-ts' 'Coordinate Transformation Matrix' 0 -1 1 1 0 0 0 0 1


      Now I need to match my touch area to the screen area - currently it uses only the inner 80% or so, so as touches move out from center they become increasingly inaccurate, and things like a scrollbar on the screen edge are completely unreachable.



      How can I adjust the command above to calibrate touch area size and offset, without losing my rotation or introducing shear, and without going back to school for a linear algebra degree?



      update



      I found this:



      https://wiki.archlinux.org/index.php/Talk:Calibrating_Touchscreen



      which talks about using xinput_calibrator to generate a transformation matrix. Unfortunately none of the scripts referenced there actually work - they don't appear to take rotation into consideration. The calibrator tool on it's own generates something like this:



      Section "InputClass"
      Identifier "calibration"
      MatchProduct "stmpe-ts"
      Option "MinX" "24507"
      Option "MaxX" "24507"
      Option "MinY" "43599"
      Option "MaxY" "43599"
      Option "SwapXY" "1" # unless it was already set to 1
      Option "InvertX" "0" # unless it was already set
      Option "InvertY" "0" # unless it was already set
      EndSection


      The scripts on that wiki are able to get me a matrix like this:



      -144.03296703296703296703 0 52.63736263736263736263 
      0 -49.08988764044943820224 33.53333333333333333333
      0 0 1


      But that seems to still be a bit off, and comparing to the "simple" rotation above seems to be conspicuously missing some values.










      share|improve this question
















      I am trying to calibrate a 3.5" pitft touchscreen on a Raspberry Pi 3 using xinput.



      I have the display rotated so it uses a landscape orientation, with the power connector facing "up" so it can rest on my desk - this means a 270 degree rotation from default. The first challenge was rotating the input to match the screen orientation, which I acheived with:



      xinput --set-prop 'stmpe-ts' 'Coordinate Transformation Matrix' 0 -1 1 1 0 0 0 0 1


      Now I need to match my touch area to the screen area - currently it uses only the inner 80% or so, so as touches move out from center they become increasingly inaccurate, and things like a scrollbar on the screen edge are completely unreachable.



      How can I adjust the command above to calibrate touch area size and offset, without losing my rotation or introducing shear, and without going back to school for a linear algebra degree?



      update



      I found this:



      https://wiki.archlinux.org/index.php/Talk:Calibrating_Touchscreen



      which talks about using xinput_calibrator to generate a transformation matrix. Unfortunately none of the scripts referenced there actually work - they don't appear to take rotation into consideration. The calibrator tool on it's own generates something like this:



      Section "InputClass"
      Identifier "calibration"
      MatchProduct "stmpe-ts"
      Option "MinX" "24507"
      Option "MaxX" "24507"
      Option "MinY" "43599"
      Option "MaxY" "43599"
      Option "SwapXY" "1" # unless it was already set to 1
      Option "InvertX" "0" # unless it was already set
      Option "InvertY" "0" # unless it was already set
      EndSection


      The scripts on that wiki are able to get me a matrix like this:



      -144.03296703296703296703 0 52.63736263736263736263 
      0 -49.08988764044943820224 33.53333333333333333333
      0 0 1


      But that seems to still be a bit off, and comparing to the "simple" rotation above seems to be conspicuously missing some values.







      raspberry-pi xinput






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      edited Mar 7 at 17:58







      superstator

















      asked Mar 2 at 0:12









      superstatorsuperstator

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