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#!/bin/bash
#all credit to Mogwai. Script taken from url: https://wiki.archlinux.org/index.php/Talk:Calibrating_Touchscreen
 
device=$(xinput_calibrator --list)
device=$(sed -n 's/.*Device\s\"\(.*\)\".*/\1/p' <<< $device)
 
#reset xinput matrix
xinput set-prop "$device" 'Coordinate Transformation Matrix' 1 0 0 0 1 0 0 0 1
 
out=$(xinput_calibrator)
 
device_name=$(sed -n 's/.*MatchProduct\"\s\"\([0-9]*\).*/\1/p' <<< $out)
 
wtot=$(sed -n 's/.*max_x=\([0-9]*\).*/\1/p' <<< $out)
htot=$(sed -n 's/.*max_y=\([0-9]*\).*/\1/p' <<< $out)
 
minx=$(sed -n 's/.*MinX\"\s\"\([0-9]*\).*/\1/p' <<< $out)
maxx=$(sed -n 's/.*MaxX\"\s\"\([0-9]*\).*/\1/p' <<< $out)
miny=$(sed -n 's/.*MinY\"\s\"\([0-9]*\).*/\1/p' <<< $out)
maxy=$(sed -n 's/.*MaxY\"\s\"\([0-9]*\).*/\1/p' <<< $out)
 
wtouch=$(bc <<< "$maxx - $minx")
htouch=$(bc <<< "$maxy - $miny")
 
c0=$(bc -l <<< "$wtot / $wtouch")
c1=$(bc -l <<< "-$minx / $wtouch")
c2=$(bc -l <<< "$htot / $htouch")
c3=$(bc -l <<< "-$miny / $htouch")
 
tf_matrix="$c0 0 $c1 0 $c2 $c3 0 0 1"
 
#alter the setting for now
xinput set-prop "$device" 'Coordinate Transformation Matrix' $tf_matrix
 
echo "To make this permanent, save the following content under '/etc/X11/xorg.conf.d/98-screen-calibration.conf' or '/usr/share/X11/xorg.conf.d/98-screen-calibration.conf'"
echo "Section \"InputClass\""
echo "    Identifier \"calibration\""
echo "    MatchProduct \"$device\""
echo "    Option \"TransformationMatrix\" \"$tf_matrix\""
echo "EndSection"