Xinput coordinate transformation matrix
I am trying to calibrate a 3.5" 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 in 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?
raspberry-pi xinput
asked 2 hours ago
superstatorsuperstator
17116
add a comment |
I am trying to calibrate a 3.5" 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 in 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?
raspberry-pi xinput
asked 2 hours ago
superstatorsuperstator
17116
add a comment |
I am trying to calibrate a 3.5" 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 in 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?
raspberry-pi xinput
asked 2 hours ago
superstatorsuperstator
17116
I am trying to calibrate a 3.5" 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 in 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?
raspberry-pi xinput
raspberry-pi xinput
asked 2 hours ago
superstatorsuperstator
17116
asked 2 hours ago
superstatorsuperstator
17116
asked 2 hours ago
superstatorsuperstator
17116
asked 2 hours ago
superstatorsuperstator
17116
asked 2 hours ago
superstatorsuperstator
17116
17116
add a comment |
add a comment |
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