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#!/bin/sh
# the next line restarts using wish \
exec wish8.5 "$0" ${1+"$@"}
# tcolor --
# This script implements a simple color editor, where you can
# create colors using either the RGB, HSB, or CYM color spaces
# and apply the color to existing applications.
package require Tk 8.4
wm title . "Color Editor"
# Global variables that control the program:
#
# colorSpace - Color space currently being used for
# editing. Must be "rgb", "cmy", or "hsb".
# label1, label2, label3 - Labels for the scales.
# red, green, blue - Current color intensities in decimal
# on a scale of 0-65535.
# color - A string giving the current color value
# in the proper form for x:
# #RRRRGGGGBBBB
# updating - Non-zero means that we're in the middle of
# updating the scales to load a new color,so
# information shouldn't be propagating back
# from the scales to other elements of the
# program: this would make an infinite loop.
# command - Holds the command that has been typed
# into the "Command" entry.
# autoUpdate - 1 means execute the update command
# automatically whenever the color changes.
# name - Name for new color, typed into entry.
set colorSpace hsb
set red 65535
set green 0
set blue 0
set color #ffff00000000
set updating 0
set autoUpdate 1
set name ""
# Create the menu bar at the top of the window.
. configure -menu [menu .menu]
menu .menu.file
.menu add cascade -menu .menu.file -label File -underline 0
.menu.file add radio -label "RGB color space" -variable colorSpace \
-value rgb -underline 0 -command {changeColorSpace rgb}
.menu.file add radio -label "CMY color space" -variable colorSpace \
-value cmy -underline 0 -command {changeColorSpace cmy}
.menu.file add radio -label "HSB color space" -variable colorSpace \
-value hsb -underline 0 -command {changeColorSpace hsb}
.menu.file add separator
.menu.file add radio -label "Automatic updates" -variable autoUpdate \
-value 1 -underline 0
.menu.file add radio -label "Manual updates" -variable autoUpdate \
-value 0 -underline 0
.menu.file add separator
.menu.file add command -label "Exit program" -underline 0 -command {exit}
# Create the command entry window at the bottom of the window, along
# with the update button.
labelframe .command -text "Command:" -padx {1m 0}
entry .command.e -textvariable command
button .command.update -text Update -command doUpdate
pack .command.update -side right -pady .1c -padx {.25c 0}
pack .command.e -expand yes -fill x -ipadx 0.25c
# Create the listbox that holds all of the color names in rgb.txt,
# if an rgb.txt file can be found.
grid .command -sticky nsew -row 2 -columnspan 3 -padx 1m -pady {0 1m}
grid columnconfigure . {1 2} -weight 1
grid rowconfigure . 0 -weight 1
foreach i {
/usr/local/lib/X11/rgb.txt /usr/lib/X11/rgb.txt
/X11/R5/lib/X11/rgb.txt /X11/R4/lib/rgb/rgb.txt
/usr/openwin/lib/X11/rgb.txt
} {
if {![file readable $i]} {
continue;
}
set f [open $i]
labelframe .names -text "Select:" -padx .1c -pady .1c
grid .names -row 0 -column 0 -sticky nsew -padx .15c -pady .15c -rowspan 2
grid columnconfigure . 0 -weight 1
listbox .names.lb -width 20 -height 12 -yscrollcommand ".names.s set" \
-exportselection false
bind .names.lb <Double-1> {
tc_loadNamedColor [.names.lb get [.names.lb curselection]]
}
scrollbar .names.s -orient vertical -command ".names.lb yview"
pack .names.lb .names.s -side left -fill y -expand 1
while {[gets $f line] >= 0} {
if {[regexp {^\s*\d+\s+\d+\s+\d+\s+(\S+)$} $line -> col]} {
.names.lb insert end $col
}
}
close $f
break
}
# Create the three scales for editing the color, and the entry for
# typing in a color value.
frame .adjust
foreach i {1 2 3} {
label .adjust.l$i -textvariable label$i -pady 0
labelframe .adjust.$i -labelwidget .adjust.l$i -padx 1m -pady 1m
scale .scale$i -from 0 -to 1000 -length 6c -orient horizontal \
-command tc_scaleChanged
pack .scale$i -in .adjust.$i
pack .adjust.$i
}
grid .adjust -row 0 -column 1 -sticky nsew -padx .15c -pady .15c
labelframe .name -text "Name:" -padx 1m -pady 1m
entry .name.e -textvariable name -width 10
pack .name.e -side right -expand 1 -fill x
bind .name.e <Return> {tc_loadNamedColor $name}
grid .name -column 1 -row 1 -sticky nsew -padx .15c -pady .15c
# Create the color display swatch on the right side of the window.
labelframe .sample -text "Color:" -padx 1m -pady 1m
frame .sample.swatch -width 2c -height 5c -background $color
label .sample.value -textvariable color -width 13 -font {Courier 12}
pack .sample.swatch -side top -expand yes -fill both
pack .sample.value -side bottom -pady .25c
grid .sample -row 0 -column 2 -sticky nsew -padx .15c -pady .15c -rowspan 2
# The procedure below is invoked when one of the scales is adjusted.
# It propagates color information from the current scale readings
# to everywhere else that it is used.
proc tc_scaleChanged args {
global red green blue colorSpace color updating autoUpdate
if {$updating} {
return
}
switch $colorSpace {
rgb {
set red [format %.0f [expr {[.scale1 get]*65.535}]]
set green [format %.0f [expr {[.scale2 get]*65.535}]]
set blue [format %.0f [expr {[.scale3 get]*65.535}]]
}
cmy {
set red [format %.0f [expr {65535 - [.scale1 get]*65.535}]]
set green [format %.0f [expr {65535 - [.scale2 get]*65.535}]]
set blue [format %.0f [expr {65535 - [.scale3 get]*65.535}]]
}
hsb {
set list [hsbToRgb [expr {[.scale1 get]/1000.0}] \
[expr {[.scale2 get]/1000.0}] \
[expr {[.scale3 get]/1000.0}]]
set red [lindex $list 0]
set green [lindex $list 1]
set blue [lindex $list 2]
}
}
set color [format "#%04x%04x%04x" $red $green $blue]
.sample.swatch config -bg $color
if {$autoUpdate} doUpdate
update idletasks
}
# The procedure below is invoked to update the scales from the
# current red, green, and blue intensities. It's invoked after
# a change in the color space and after a named color value has
# been loaded.
proc tc_setScales {} {
global red green blue colorSpace updating
set updating 1
switch $colorSpace {
rgb {
.scale1 set [format %.0f [expr {$red/65.535}]]
.scale2 set [format %.0f [expr {$green/65.535}]]
.scale3 set [format %.0f [expr {$blue/65.535}]]
}
cmy {
.scale1 set [format %.0f [expr {(65535-$red)/65.535}]]
.scale2 set [format %.0f [expr {(65535-$green)/65.535}]]
.scale3 set [format %.0f [expr {(65535-$blue)/65.535}]]
}
hsb {
set list [rgbToHsv $red $green $blue]
.scale1 set [format %.0f [expr {[lindex $list 0] * 1000.0}]]
.scale2 set [format %.0f [expr {[lindex $list 1] * 1000.0}]]
.scale3 set [format %.0f [expr {[lindex $list 2] * 1000.0}]]
}
}
set updating 0
}
# The procedure below is invoked when a named color has been
# selected from the listbox or typed into the entry. It loads
# the color into the editor.
proc tc_loadNamedColor name {
global red green blue color autoUpdate
if {[string index $name 0] != "#"} {
set list [winfo rgb .sample.swatch $name]
set red [lindex $list 0]
set green [lindex $list 1]
set blue [lindex $list 2]
} else {
switch [string length $name] {
4 {set format "#%1x%1x%1x"; set shift 12}
7 {set format "#%2x%2x%2x"; set shift 8}
10 {set format "#%3x%3x%3x"; set shift 4}
13 {set format "#%4x%4x%4x"; set shift 0}
default {error "syntax error in color name \"$name\""}
}
if {[scan $name $format red green blue] != 3} {
error "syntax error in color name \"$name\""
}
set red [expr {$red<<$shift}]
set green [expr {$green<<$shift}]
set blue [expr {$blue<<$shift}]
}
tc_setScales
set color [format "#%04x%04x%04x" $red $green $blue]
.sample.swatch config -bg $color
if {$autoUpdate} doUpdate
}
# The procedure below is invoked when a new color space is selected.
# It changes the labels on the scales and re-loads the scales with
# the appropriate values for the current color in the new color space
proc changeColorSpace space {
global label1 label2 label3
switch $space {
rgb {
set label1 "Adjust Red:"
set label2 "Adjust Green:"
set label3 "Adjust Blue:"
tc_setScales
return
}
cmy {
set label1 "Adjust Cyan:"
set label2 "Adjust Magenta:"
set label3 "Adjust Yellow:"
tc_setScales
return
}
hsb {
set label1 "Adjust Hue:"
set label2 "Adjust Saturation:"
set label3 "Adjust Brightness:"
tc_setScales
return
}
}
}
# The procedure below converts an RGB value to HSB. It takes red, green,
# and blue components (0-65535) as arguments, and returns a list containing
# HSB components (floating-point, 0-1) as result. The code here is a copy
# of the code on page 615 of "Fundamentals of Interactive Computer Graphics"
# by Foley and Van Dam.
proc rgbToHsv {red green blue} {
if {$red > $green} {
set max [expr {double($red)}]
set min [expr {double($green)}]
} else {
set max [expr {double($green)}]
set min [expr {double($red)}]
}
if {$blue > $max} {
set max [expr {double($blue)}]
} elseif {$blue < $min} {
set min [expr {double($blue)}]
}
set range [expr {$max-$min}]
if {$max == 0} {
set sat 0
} else {
set sat [expr {($max-$min)/$max}]
}
if {$sat == 0} {
set hue 0
} else {
set rc [expr {($max - $red)/$range}]
set gc [expr {($max - $green)/$range}]
set bc [expr {($max - $blue)/$range}]
if {$red == $max} {
set hue [expr {($bc - $gc)/6.0}]
} elseif {$green == $max} {
set hue [expr {(2 + $rc - $bc)/6.0}]
} else {
set hue [expr {(4 + $gc - $rc)/6.0}]
}
if {$hue < 0.0} {
set hue [expr {$hue + 1.0}]
}
}
return [list $hue $sat [expr {$max/65535}]]
}
# The procedure below converts an HSB value to RGB. It takes hue, saturation,
# and value components (floating-point, 0-1.0) as arguments, and returns a
# list containing RGB components (integers, 0-65535) as result. The code
# here is a copy of the code on page 616 of "Fundamentals of Interactive
# Computer Graphics" by Foley and Van Dam.
proc hsbToRgb {hue sat value} {
set v [format %.0f [expr {65535.0*$value}]]
if {$sat == 0} {
return "$v $v $v"
} else {
set hue [expr {$hue*6.0}]
if {$hue >= 6.0} {
set hue 0.0
}
scan $hue. %d i
set f [expr {$hue-$i}]
set p [format %.0f [expr {65535.0*$value*(1 - $sat)}]]
set q [format %.0f [expr {65535.0*$value*(1 - ($sat*$f))}]]
set t [format %.0f [expr {65535.0*$value*(1 - ($sat*(1 - $f)))}]]
switch $i {
0 {return "$v $t $p"}
1 {return "$q $v $p"}
2 {return "$p $v $t"}
3 {return "$p $q $v"}
4 {return "$t $p $v"}
5 {return "$v $p $q"}
default {error "i value $i is out of range"}
}
}
}
# The procedure below is invoked when the "Update" button is pressed,
# and whenever the color changes if update mode is enabled. It
# propagates color information as determined by the command in the
# Command entry.
proc doUpdate {} {
global color command
set newCmd $command
regsub -all %% $command $color newCmd
eval $newCmd
}
changeColorSpace hsb
# Local Variables:
# mode: tcl
# End: