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- #!/usr/skunk/bin/wish -f
- #
- # 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.
-
- wm title . "Color Editor"
- tk_bindForTraversal .
- focus .
-
- # 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.
-
- frame .menu -relief raised -borderwidth 2
- pack .menu -side top -fill x
- menubutton .menu.file -text File -menu .menu.file.m -underline 0
- menu .menu.file.m
- .menu.file.m add radio -label "RGB color space" -variable colorSpace \
- -value rgb -underline 0 -command {changeColorSpace rgb}
- .menu.file.m add radio -label "CMY color space" -variable colorSpace \
- -value cmy -underline 0 -command {changeColorSpace cmy}
- .menu.file.m add radio -label "HSB color space" -variable colorSpace \
- -value hsb -underline 0 -command {changeColorSpace hsb}
- .menu.file.m add separator
- .menu.file.m add radio -label "Automatic updates" -variable autoUpdate \
- -value 1 -underline 0
- .menu.file.m add radio -label "Manual updates" -variable autoUpdate \
- -value 0 -underline 0
- .menu.file.m add separator
- .menu.file.m add command -label "Exit program" -underline 0 \
- -command "destroy ."
- pack .menu.file -side left
- tk_menuBar .menu .menu.file
-
- # Create the command entry window at the bottom of the window, along
- # with the update button.
-
- frame .bot -relief raised -borderwidth 2
- pack .bot -side bottom -fill x
- label .commandLabel -text "Command:"
- entry .command -relief sunken -borderwidth 2 -textvariable command \
- -font -Adobe-Courier-Medium-R-Normal-*-120-*
- button .update -text Update -command doUpdate
- pack .commandLabel -in .bot -side left
- pack .update -in .bot -side right -pady .1c -padx .25c
- pack .command -in .bot -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.
-
- frame .middle -relief raised -borderwidth 2
- pack .middle -side top -fill both
- 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} {
- if ![file readable $i] {
- continue;
- }
- set f [open $i]
- frame .middle.left
- pack .middle.left -side left -padx .25c -pady .25c
- listbox .names -geometry 20x12 -yscrollcommand ".scroll set" \
- -relief sunken -borderwidth 2 -exportselection false
- tk_listboxSingleSelect .names
- bind .names <Double-1> {
- tc_loadNamedColor [.names get [.names curselection]]
- }
- scrollbar .scroll -orient vertical -command ".names yview" \
- -relief sunken -borderwidth 2
- pack .names -in .middle.left -side left
- pack .scroll -in .middle.left -side right -fill y
- while {[gets $f line] >= 0} {
- if {[llength $line] == 4} {
- .names insert end [lindex $line 3]
- }
- }
- close $f
- break;
- }
-
- # Create the three scales for editing the color, and the entry for
- # typing in a color value.
-
- frame .middle.middle
- pack .middle.middle -side left -expand yes -fill y
- frame .middle.middle.1
- frame .middle.middle.2
- frame .middle.middle.3
- frame .middle.middle.4
- pack .middle.middle.1 .middle.middle.2 .middle.middle.3 -side top -expand yes
- pack .middle.middle.4 -side top -expand yes -fill x
- foreach i {1 2 3} {
- label .label$i -textvariable label$i
- scale .scale$i -from 0 -to 1000 -length 10c -orient horizontal \
- -command tc_scaleChanged
- button .up$i -width 2 -text + -command "tc_inc $i 1"
- button .down$i -width 2 -text - -command "tc_inc $i -1"
- pack .label$i -in .middle.middle.$i -side top -anchor w
- pack .down$i -in .middle.middle.$i -side left -padx .25c
- pack .scale$i -in .middle.middle.$i -side left
- pack .up$i -in .middle.middle.$i -side left -padx .25c
- }
- label .nameLabel -text "Name of new color:"
- entry .name -relief sunken -borderwidth 2 -textvariable name -width 30 \
- -font -Adobe-Courier-Medium-R-Normal-*-120-*
- pack .nameLabel .name -in .middle.middle.4 -side left
- bind .name <Return> {tc_loadNamedColor $name}
-
- # Create the color display swatch on the right side of the window.
-
- frame .middle.right
- pack .middle.right -side left -pady .25c -padx .25c -anchor s
- frame .swatch -width 2c -height 5c -background $color
- label .value -textvariable color -width 13 \
- -font -Adobe-Courier-Medium-R-Normal-*-120-*
- pack .swatch -in .middle.right -side top -expand yes -fill both
- pack .value -in .middle.right -side bottom -pady .25c
-
- # The procedure below handles the "+" and "-" buttons next to
- # the adjustor scales. They just increment or decrement the
- # appropriate scale value.
-
- proc tc_inc {scale inc} {
- .scale$scale set [expr [.scale$scale get]+$inc]
- }
-
- # 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 $updating {
- return
- }
- if {$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]]
- } else {
- if {$colorSpace == "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}]]
- } else {
- 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]
- .swatch config -bg $color
- if $autoUpdate doUpdate
- update idletasks
- }
-
- # The procedure below is invoked to update the scales from the
- # current red, green, and blue intensities. It's invoked after
- # a change in the color space and after a named color value has
- # been loaded.
-
- proc tc_setScales {} {
- global red green blue colorSpace updating
- set updating 1
- if {$colorSpace == "rgb"} {
- .scale1 set [format %.0f [expr $red/65.535]]
- .scale2 set [format %.0f [expr $green/65.535]]
- .scale3 set [format %.0f [expr $blue/65.535]]
- } else {
- if {$colorSpace == "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]]
- } else {
- 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 .swatch $name]
- set red [lindex $list 0]
- set green [lindex $list 1]
- set blue [lindex $list 2]
- } else {
- case [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]
- .swatch config -bg $color
- if $autoUpdate doUpdate
- }
-
- # The procedure below is invoked when a new color space is selected.
- # It changes the labels on the scales and re-loads the scales with
- # the appropriate values for the current color in the new color space
-
- proc changeColorSpace space {
- global label1 label2 label3
- if {$space == "rgb"} {
- set label1 Red
- set label2 Green
- set label3 Blue
- tc_setScales
- return
- }
- if {$space == "cmy"} {
- set label1 Cyan
- set label2 Magenta
- set label3 Yellow
- tc_setScales
- return
- }
- if {$space == "hsb"} {
- set label1 Hue
- set label2 Saturation
- set label3 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 $red.0
- set min $green.0
- } else {
- set max $green.0
- set min $red.0
- }
- if {$blue > $max} {
- set max $blue.0
- } else {
- if {$blue < $min} {
- set min $blue.0
- }
- }
- 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 == $max} {
- set hue [expr {.166667*($bc - $gc)}]
- } else {
- if {$green == $max} {
- set hue [expr {.166667*(2 + $rc - $bc)}]
- } else {
- set hue [expr {.166667*(4 + $gc - $rc)}]
- }
- }
- }
- 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)))}]]
- case $i \
- 0 {return "$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"}
- 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
-