rotate-screen.sh

#!/bin/bash
# This script rotates the screen and touchscreen input 90 degrees each time it is called, 

# by Ruben Barkow: https://gist.github.com/rubo77/daa262e0229f6e398766

#### configuration
# find your Touchscreen device with `xinput`
TouchscreenDevice='ELAN Touchscreen'

screenMatrix=$(xinput --list-props "$TouchscreenDevice" | awk '/Coordinate Transformation Matrix/{print $5$6$7$8$9$10$11$12$NF}')

# Matrix for rotation
# ⎡ 1 0 0 ⎤
# ⎜ 0 1 0 ⎥
# ⎣ 0 0 1 ⎦
normal='1 0 0 0 1 0 0 0 1'
normal_float='1.000000,0.000000,0.000000,0.000000,1.000000,0.000000,0.000000,0.000000,1.000000'

#⎡ -1  0 1 ⎤
#⎜  0 -1 1 ⎥
#⎣  0  0 1 ⎦
inverted='-1 0 1 0 -1 1 0 0 1'
inverted_float='-1.000000,0.000000,1.000000,0.000000,-1.000000,1.000000,0.000000,0.000000,1.000000'

# 90° to the left 
# ⎡ 0 -1 1 ⎤
# ⎜ 1  0 0 ⎥
# ⎣ 0  0 1 ⎦
left='0 -1 1 1 0 0 0 0 1'
left_float='0.000000,-1.000000,1.000000,1.000000,0.000000,0.000000,0.000000,0.000000,1.000000'

# 90° to the right
#⎡  0 1 0 ⎤
#⎜ -1 0 1 ⎥
#⎣  0 0 1 ⎦
right='0 1 0 -1 0 1 0 0 1'
right_float='0.000000,1.000000,0.000000,-1.000000,0.000000,1.000000,0.000000,0.000000,1.000000'


function set_normal() {
  xrandr -o normal
  xinput set-prop "$TouchscreenDevice" 'Coordinate Transformation Matrix' $normal

  killall notify-osd
  notify-send "Screen normal"
}

function set_inversed() {
  xrandr -o inverted
  xinput set-prop "$TouchscreenDevice" 'Coordinate Transformation Matrix' $inverted

  killall notify-osd
  notify-send "Screen inverted"
}

function set_left() {
  xrandr -o left
  xinput set-prop "$TouchscreenDevice" 'Coordinate Transformation Matrix' $left

  killall notify-osd
  notify-send "Screen left"
}

function set_right() {
  xrandr -o right
  xinput set-prop "$TouchscreenDevice" 'Coordinate Transformation Matrix' $right

  killall notify-osd
  notify-send "Screen right"

}


function do_twist() {
  if [ $screenMatrix == $normal_float ]
  then
    set_left
  fi
  if [ $screenMatrix == $left_float ]
  then
    set_inversed
  fi
  if [ $screenMatrix == $inverted_float ]
  then
    set_right
  fi
  if [ $screenMatrix == $right_float ]
  then
    set_normal
  fi

}


function do_upside_down_toggle() {
  if [ $screenMatrix != $inverted_float ]
  then
    set_inversed
  else
    set_normal
  fi

}

function do_horizontal_vertical_toggle() {
  if [ $screenMatrix != $normal_float ]
  then
    set_normal
  else
    set_left
  fi
}

function usage() {
    echo 'Usage: rotate-screen.sh [OPTION]'
    echo
    echo 'This script rotates the screen and touchscreen input 90 degrees each time it is called,' 
    echo
    echo Usage:
    echo ' -h --help display this help'
    echo ' -n | normal - always rotates the screen back to normal'
    echo ' -i | inv | inverse - inverse horizontal'
    echo ' -r | right - rotate screen right'
    echo ' -l | left - rotate screen left'

}


case "$1" in 
  -i|inv|inverse)
    do_upside_down_toggle
    ;;

  -n|normal)
    set_normal
    ;;

  -l|left)
    set_left
    ;;

  -r|right)
    set_right
    ;;
  -v|vert|vertical)
    do_horizontal_vertical_toggle
    ;;
  -t|twist)
    do_twist
    ;;
  -h|--help|*)
    usage
    ;;
esac


exit 0

if [ $screenMatrix == $normal_float ] && [ "$1" != "-n" ]
then
  echo "Upside down"
elif [ $screenMatrix == $inverted_float ] && [ "$1" != "-j" ] && [ "$1" != "-n" ]
then
  echo "90° to the left"
elif [ $screenMatrix == $left_float ] && [ "$1" != "-j" ] && [ "$1" != "-n" ]
then
  echo "90° to the right"
else
fi