diff options
Diffstat (limited to 'library/demos/tcolor')
-rw-r--r-- | library/demos/tcolor | 358 |
1 files changed, 358 insertions, 0 deletions
diff --git a/library/demos/tcolor b/library/demos/tcolor new file mode 100644 index 0000000..50c0e68 --- /dev/null +++ b/library/demos/tcolor @@ -0,0 +1,358 @@ +#!/bin/sh +# the next line restarts using wish \ +exec wish "$0" "$@" + +# 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. +# +# SCCS: @(#) tcolor 1.11 96/06/24 16:43:11 + +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. + +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 + +# 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 {Courier 12} +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 + /usr/openwin/lib/X11/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 -width 20 -height 12 -yscrollcommand ".scroll set" \ + -relief sunken -borderwidth 2 -exportselection false + 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 6c -orient horizontal \ + -command tc_scaleChanged + pack .scale$i .label$i -in .middle.middle.$i -side top -anchor w +} +label .nameLabel -text "Name:" +entry .name -relief sunken -borderwidth 2 -textvariable name -width 10 \ + -font {Courier 12} +pack .nameLabel -in .middle.middle.4 -side left +pack .name -in .middle.middle.4 -side right -expand 1 -fill x +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 {Courier 12} +pack .swatch -in .middle.right -side top -expand yes -fill both +pack .value -in .middle.right -side bottom -pady .25c + +# 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 - $rc)}] + } + } + if {$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)))}]] + 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 |