# the next line restarts using wish \
# 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.
# RCS: @(#) $Id: tcolor,v 1.3 2001/10/29 16:23:32 dkf Exp $
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
# color - A string giving the current color value
# in the proper form for x:
# 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.
if {$tcl_platform(platform
) eq
"unix"} {
option add
*Entry.background white
# Create the menu bar at the top of the window.
. configure
-menu [menu .menu
]
.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 radio
-label "Automatic updates" -variable autoUpdate \
.menu.
file add radio
-label "Manual updates" -variable autoUpdate \
.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
-relief sunken
-borderwidth 2 -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
/usr
/local
/lib
/X11
/rgb.txt
/usr
/lib
/X11
/rgb.txt
/X11
/R
5/lib
/X11
/rgb.txt
/X11
/R
4/lib
/rgb
/rgb.txt
/usr
/openwin
/lib
/X11
/rgb.txt
if {![file readable
$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" \
-relief sunken
-borderwidth 2 -exportselection false
bind .names.lb
<Double-1
> {
tc_loadNamedColor
[.names.lb get
[.names.lb curselection
]]
scrollbar .names.s
-orient vertical
-command ".names.lb yview" \
-relief sunken
-borderwidth 2
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
# Create the three scales for editing the color, and the entry for
# typing in a color value.
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 \
pack .scale
$i -in .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
-relief sunken
-borderwidth 2 -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
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}]]
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}]]
set list
[hsbToRgb
[expr {[.scale1 get
]/1000.0}] \
[expr {[.scale2 get
]/1000.0}] \
[expr {[.scale3 get
]/1000.0}]]
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
# 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
global red green blue colorSpace updating
.scale1
set [format
%.0f
[expr {$red/65.535}]]
.scale2
set [format
%.0f
[expr {$green/65.535}]]
.scale3
set [format
%.0f
[expr {$blue/65.535}]]
.scale1
set [format
%.0f
[expr {(65535-$red)/65.535}]]
.scale2
set [format
%.0f
[expr {(65535-$green)/65.535}]]
.scale3
set [format
%.0f
[expr {(65535-$blue)/65.535}]]
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}]]
# 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 green
[lindex
$list 1]
set blue
[lindex
$list 2]
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}]
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
set label2
"Adjust Green:"
set label3
"Adjust Blue:"
set label1
"Adjust Cyan:"
set label2
"Adjust Magenta:"
set label3
"Adjust Yellow:"
set label2
"Adjust Saturation:"
set label3
"Adjust Brightness:"
# 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"
proc rgbToHsv
{red green blue
} {
set max
[expr {double
($red)}]
set min
[expr {double
($green)}]
set max
[expr {double
($green)}]
set min
[expr {double
($red)}]
set max
[expr {double
($blue)}]
} elseif
{$blue < $min} {
set min
[expr {double
($blue)}]
set range
[expr {$max-$min}]
set sat
[expr {($max-$min)/$max}]
set rc
[expr {($max - $red)/$range}]
set gc
[expr {($max - $green)/$range}]
set bc [expr {($max - $blue)/$range}]
set hue
[expr {($bc - $gc)/6.0}]
} elseif
{$green == $max} {
set hue
[expr {(2 + $rc - $bc)/6.0}]
set hue
[expr {(4 + $gc - $rc)/6.0}]
set hue
[expr {$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*$value}]]
set hue
[expr {$hue*6.0}]
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)))}]]
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
regsub
-all %% $command $color newCmd