www.nico.schottelius.org/software/gpm/browse_source/gpm-1.20.5/contrib/scripts/gunze-setup

#!/bin/sh
#
# gunze-setup, copied and adapted from microtouch-setup.
# Most of this code is duplicated, this is definitely not good.
#
# This program is execute by tclsh if we are in the console, and by wish
# otherwise (assuming we are under a graphic environment

#the following is a comment for tcl \
if [ $TERM = "linux" ] ; then exec tclsh $0 $* ; fi

#the following is another comment for tcl \
exec wish $0 $*

########### That's Tcl...

# The Gunze touchscreens don't adapt their output to calibration, so
# we must save calibration information somewhere...
set datafile /etc/gpm-calibration

puts "Calibration program for Gunze touch-screens"

# check generic permission
set who [exec whoami]
if [string compare $who root] {
    puts stderr "you must be root to be able to run this program"
}

# check if we can access this file
if [catch {set F [open $datafile a]} err] {
    puts stderr "$argv0: Can't open $datafile: $err"
    exit 1
}
close $F

# Look for /dev/touchscreen or /dev/mouse
if [file exists /dev/mouse] {
    set dev /dev/mouse
}
if [file exists /dev/touchscreen] {
    set dev /dev/touchscreen
}
if ![info exists dev] {
    puts stderr "$argv0: need to access /dev/touchscreen or /dev/mouse"
    exit 1
}

# horrible, for the linux console
proc goto {x y} {
    set x [expr $x]
    set y [expr $y]
    puts -nonewline [format "\x1B\[%03i;%03iH" $y $x]
}

# an abort procedure, and one to read touchscreen data
proc do_abort {msg} {
    if ![string compare $env(TERM) linux] {
	goto 0 $env(LINES)-2
    } else {
	wm withdraw .
    }
    puts stderr $msg
    killall -CONT gpm
    exit 1
}

proc get_position file {
    global dev
    while 1 {
	gets $file string
	if [scan $string %c%d,%d  cmd x y]!=3 {
	    do_abort  "Received wrong data \"$string\" from $dev"
	}
	# If release ('R') it's done
	if $cmd==0x52 {
	    return "$sx $sy"
	}
	# If a touch event ('T'), save it
	if $cmd==0x54 {
	    set sx $x; set sy $y
	} else {
	    do_abort "Received wrong data \"$string\" from $dev"
	}
    }
}



if ![string compare $env(TERM) linux] {

    # Text-mode calibration

    if {![info exists env(COLUMNS)] || ![info exists env(LINES)]} {
	puts stderr "Please set COLUMNS and LINES in your environment"
	puts stderr " for example, you can issue"
	puts stderr "        eval `resize`"
	puts stderr " in your shell before running this program"
	exit 1
    }
    fconfigure stdout -buffering none
    exec clear > /dev/tty


    # To calibrate, draw targets at 1/8 and 7/8 x-y
    set x [expr $env(COLUMNS)/8]
    set y [expr $env(LINES)/8]
    set X [expr $env(COLUMNS) - $x]
    set Y [expr $env(LINES) - $y]

    # half x and y
    set hx [expr $env(COLUMNS)/2]
    set hy [expr $env(LINES)/2]

    goto $hx-10 $hy-1; puts -nonewline "Please touch the lower"
    goto $hx-10 $hy-0; puts -nonewline "left target, then the"
    goto $hx-10 $hy+1; puts -nonewline "upper right target."

    exec killall -STOP gpm
    set F [open $dev r+]; # $dev is /dev/touchscreen or /dev/mouse
    fconfigure $F -buffering none -translation auto

    # Draw the target
    goto $x $Y-1; puts -nonewline "|"
    goto $x-1 $Y; puts -nonewline "-+-"
    goto $x $Y+1; puts -nonewline "|"

    # Read coordinates
    set first [get_position $F]

    #remove the target, draw the other
    goto $x $Y-1; puts -nonewline " "
    goto $x-1 $Y; puts -nonewline "   "
    goto $x $Y+1; puts -nonewline " "

    goto $X $y-1; puts -nonewline "|"
    goto $X-1 $y; puts -nonewline "-+-"
    goto $X $y+1; puts -nonewline "|"

    # Read coordinates
    set second [get_position $F]

    # remove the target
    goto $X $y-1; puts -nonewline " "
    goto $X-1 $y; puts -nonewline "   "
    goto $X $y+1; puts -nonewline " "
    close $F

    exec killall -CONT gpm
    goto 0 $env(LINES)-2

    # Now save the coordinates
    set F [open $datafile w]
    puts $F "# Calibration coordinates for Gunze device"
    puts $F "$first $second"
    close $F

    puts "Done"
    exit 0

}

# X calibration. This is Tk, so we can use the canvas items.
# However, there is uncertainty about the absolute X and Y...

set wid [winfo screenwidth .]
set hei [winfo screenheight .]
wm geometry . ${wid}x${hei}+0+0

set x [expr $wid/8]
set y [expr $hei/8]
set X [expr $wid - $x]
set Y [expr $hei - $y]
set hx [expr $wid/2]
set hy [expr $hei/2]
set cwid [expr 2*$x]
set chei [expr 2*$y]

# The offset variables account for window manager borders etc
set xoff1 0
set yoff1 0
set xoff2 0
set yoff2 0

proc recanvas {} {
    global x y X Y xoff1 xoff2 yoff1 yoff2
    catch {.l.c delete line}
    catch {.r.c delete line}
    
    set x1 [expr $x-$xoff1]
    set y1 [expr $Y-$yoff1]
    set x2 [expr $X-$xoff2]
    set y2 [expr $y-$yoff2]
    
    .l.c create line [expr $x1-50] $y1 [expr $x1+50] $y1 \
	    -width 3 -fill red -tag line
    .l.c create line $x1 [expr $y1-50] $x1 [expr $y1+50] \
	    -width 3 -fill red -tag line
    
    .r.c create line [expr $x2-50] $y2 [expr $x2+50] $y2 \
	    -width 3 -fill red -tag line
    .r.c create line $x2 [expr $y2-50] $x2 [expr $y2+50] \
	    -width 3 -fill red -tag line
}


pack [frame .l] -side left -expand true -fill both 
pack [frame .m] -side left -expand true -fill both 
pack [frame .r] -side left -expand true -fill both 
pack [canvas .l.c -width $cwid -hei $chei -scrollregion "0 0 $cwid $chei" \
	] -side bottom 
pack [frame .l.f] -expand true -fill both; #filler
pack [canvas .r.c -width $cwid -hei $chei -scrollregion "0 0 $cwid $chei" \
	] -side top
pack [frame .r.f] -expand true -fill both; #filler

pack [label .m.t -text "Gunze Calibrator" -foreground blue] -pady 40
pack [label .m.l -bd 5 -relief raised] -expand true -fill both
pack [label .m.s] -expand true -fill both

bind .l.c <Enter> {
    set xoff1 [expr %X - %x]
    set yoff1 [expr %Y - %y]
    set x1 [expr $x-$xoff1]
    set y1 [expr $Y-$yoff1]

    catch {.l.c delete line}
    
    .l.c create line [expr $x1-50] $y1 [expr $x1+50] $y1 \
	    -width 3 -fill red -tag line
    .l.c create line $x1 [expr $y1-50] $x1 [expr $y1+50] \
	    -width 3 -fill red -tag line
    
    set done1 1
    update
}
bind .r.c <Enter> {
    set xoff2 [expr %X - %x]
    set yoff2 [expr %Y - %y]
    set x2 [expr $X-$xoff2]
    set y2 [expr $y-$yoff2]

    catch {.r.c delete line}

    .r.c create line [expr $x2-50] $y2 [expr $x2+50] $y2 \
	    -width 3 -fill red -tag line
    .r.c create line $x2 [expr $y2-50] $x2 [expr $y2+50] \
	    -width 3 -fill red -tag line

    set done2 1
    update
}

set done1 0; set done2 0

update

.m.l config -text "Please move the mouse towards\n\
	the lower left corner, until a cross\n\
	appears (there's no need to click)"
vwait done1

update

if !$done2 {
    .m.l config -text "Please move the mouse towards\n\
	    the upper right corner, until a cross\n\
	    appears (there's no need to click)"
    vwait done2
}

.m.l config -text "\nWait....\n"
after 1000

.m.l config -text "Please touch the lower-left taget\n\
	and then the upper-right target\n\
	to calibrate the touch screen"
update

exec killall -STOP gpm
set F [open $dev r+]; # $dev is /dev/touchscreen or /dev/mouse
fconfigure $F -buffering none -translation auto

.m.s configure -text "Calibration started"
update

# Read coordinates
set first [get_position $F]

.l.c itemco line -fill green
.m.s configure -text "First target ok"
update

# Read coordinates
set second [get_position $F]

.r.c itemco line -fill green
.m.s configure -text "Second target ok"
update

close $F

exec killall -CONT gpm

# Now save the coordinates
set F [open $datafile w]
puts $F "# Calibration coordinates for Gunze device"
puts $F "$first $second"
close $F

after 1000
.m.s configure -text ""
pack [button .m.b -text Ok -command exit]

exit 0