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+# clrpick.tcl --
+#
+#	Color selection dialog for platforms that do not support a
+#	standard color selection dialog.
+#
+# SCCS: @(#) clrpick.tcl 1.3 96/09/05 09:59:24
+#
+# Copyright (c) 1996 Sun Microsystems, Inc.
+#
+# See the file "license.terms" for information on usage and redistribution
+# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
+#
+# ToDo:
+#
+#	(1): Find out how many free colors are left in the colormap and
+#	     don't allocate too many colors.
+#	(2): Implement HSV color selection. 
+#
+
+# tkColorDialog --
+#
+#	Create a color dialog and let the user choose a color. This function
+#	should not be called directly. It is called by the tk_chooseColor
+#	function when a native color selector widget does not exist
+#
+proc tkColorDialog {args} {
+    global tkPriv
+    set w .__tk__color
+    upvar #0 $w data
+
+    # The lines variables track the start and end indices of the line
+    # elements in the colorbar canvases.
+    set data(lines,red,start)   0
+    set data(lines,red,last)   -1
+    set data(lines,green,start) 0
+    set data(lines,green,last) -1
+    set data(lines,blue,start)  0
+    set data(lines,blue,last)  -1
+
+    # This is the actual number of lines that are drawn in each color strip.
+    # Note that the bars may be of any width.
+    # However, NUM_COLORBARS must be a number that evenly divides 256.
+    # Such as 256, 128, 64, etc.
+    set data(NUM_COLORBARS) 8
+
+    # BARS_WIDTH is the number of pixels wide the color bar portion of the
+    # canvas is. This number must be a multiple of NUM_COLORBARS
+    set data(BARS_WIDTH) 128
+
+    # PLGN_WIDTH is the number of pixels wide of the triangular selection
+    # polygon. This also results in the definition of the padding on the 
+    # left and right sides which is half of PLGN_WIDTH. Make this number even.
+    set data(PLGN_HEIGHT) 10
+
+    # PLGN_HEIGHT is the height of the selection polygon and the height of the 
+    # selection rectangle at the bottom of the color bar. No restrictions.
+    set data(PLGN_WIDTH) 10
+
+    tkColorDialog_Config $w $args
+    tkColorDialog_InitValues $w
+
+    if ![winfo exists $w] {
+	toplevel $w -class tkColorDialog
+	tkColorDialog_BuildDialog $w
+    }
+    wm transient $w $data(-parent)
+
+
+    # 5. Withdraw the window, then update all the geometry information
+    # so we know how big it wants to be, then center the window in the
+    # display and de-iconify it.
+
+    wm withdraw $w
+    update idletasks
+    set x [expr [winfo screenwidth $w]/2 - [winfo reqwidth $w]/2 \
+	- [winfo vrootx [winfo parent $w]]]
+    set y [expr [winfo screenheight $w]/2 - [winfo reqheight $w]/2 \
+	- [winfo vrooty [winfo parent $w]]]
+    wm geom $w +$x+$y
+    wm deiconify $w
+    wm title $w $data(-title)
+
+    # 6. Set a grab and claim the focus too.
+
+    set oldFocus [focus]
+    set oldGrab [grab current $w]
+    if {$oldGrab != ""} {
+	set grabStatus [grab status $oldGrab]
+    }
+    grab $w
+    focus $data(okBtn)
+
+    # 7. Wait for the user to respond, then restore the focus and
+    # return the index of the selected button.  Restore the focus
+    # before deleting the window, since otherwise the window manager
+    # may take the focus away so we can't redirect it.  Finally,
+    # restore any grab that was in effect.
+
+    tkwait variable tkPriv(selectColor)
+    catch {focus $oldFocus}
+    grab release $w
+    destroy $w
+    unset data
+    if {$oldGrab != ""} {
+	if {$grabStatus == "global"} {
+	    grab -global $oldGrab
+	} else {
+	    grab $oldGrab
+	}
+    }
+    return $tkPriv(selectColor)
+}
+
+# tkColorDialog_InitValues --
+#
+#	Get called during initialization or when user resets NUM_COLORBARS
+#
+proc tkColorDialog_InitValues {w} {
+    upvar #0 $w data
+
+    # IntensityIncr is the difference in color intensity between a colorbar
+    # and its neighbors.
+    set data(intensityIncr) [expr 256 / $data(NUM_COLORBARS)]
+
+    # ColorbarWidth is the width of each colorbar
+    set data(colorbarWidth) \
+	[expr $data(BARS_WIDTH) / $data(NUM_COLORBARS)]
+
+    # Indent is the width of the space at the left and right side of the
+    # colorbar. It is always half the selector polygon width, because the
+    # polygon extends into the space.
+    set data(indent) [expr $data(PLGN_WIDTH) / 2]
+
+    set data(colorPad) 2
+    set data(selPad)   [expr $data(PLGN_WIDTH) / 2]
+
+    #
+    # minX is the x coordinate of the first colorbar
+    #
+    set data(minX) $data(indent)
+
+    #
+    # maxX is the x coordinate of the last colorbar
+    #
+    set data(maxX) [expr $data(BARS_WIDTH) + $data(indent)-1]
+
+    #
+    # canvasWidth is the width of the entire canvas, including the indents
+    #
+    set data(canvasWidth) [expr $data(BARS_WIDTH) + \
+	$data(PLGN_WIDTH)]
+
+    # Set the initial color, specified by -initialcolor, or the
+    # color chosen by the user the last time.
+    set data(selection) $data(-initialcolor)
+    set data(finalColor)  $data(-initialcolor)
+    set rgb [winfo rgb . $data(selection)]
+
+    set data(red,intensity)   [expr [lindex $rgb 0]/0x100]
+    set data(green,intensity) [expr [lindex $rgb 1]/0x100]
+    set data(blue,intensity)  [expr [lindex $rgb 2]/0x100]
+}
+
+# tkColorDialog_Config  --
+#
+#	Parses the command line arguments to tk_chooseColor
+#
+proc tkColorDialog_Config {w argList} {
+    global tkPriv
+    upvar #0 $w data
+
+    # 1: the configuration specs
+    #
+    set specs {
+	{-initialcolor "" "" ""}
+	{-parent "" "" "."}
+	{-title "" "" "Color"}
+    }
+
+    # 2: parse the arguments
+    #
+    tclParseConfigSpec $w $specs "" $argList
+
+    if ![string compare $data(-title) ""] {
+	set data(-title) " "
+    }
+    if ![string compare $data(-initialcolor) ""] {
+	if {[info exists tkPriv(selectColor)] && \
+		[string compare $tkPriv(selectColor) ""]} {
+	    set data(-initialcolor) $tkPriv(selectColor)
+	} else {
+	    set data(-initialcolor) [. cget -background]
+	}
+    } else {
+	if [catch {winfo rgb . $data(-initialcolor)} err] {
+	    error $err
+	}
+    }
+
+    if ![winfo exists $data(-parent)] {
+	error "bad window path name \"$data(-parent)\""
+    }
+}
+
+# tkColorDialog_BuildDialog --
+#
+#	Build the dialog.
+#
+proc tkColorDialog_BuildDialog {w} {
+    upvar #0 $w data
+
+    # TopFrame contains the color strips and the color selection
+    #
+    set topFrame [frame $w.top -relief raised -bd 1]
+
+    # StripsFrame contains the colorstrips and the individual RGB entries
+    set stripsFrame [frame $topFrame.colorStrip]
+
+    foreach c { Red Green Blue } {
+	set color [string tolower $c]
+
+	# each f frame contains an [R|G|B] entry and the equiv. color strip.
+	set f [frame $stripsFrame.$color]
+
+	# The box frame contains the label and entry widget for an [R|G|B]
+	set box [frame $f.box]
+
+	label $box.label -text $c: -width 6 -under 0 -anchor ne
+	entry $box.entry -textvariable [format %s $w]($color,intensity) \
+	    -width 4
+	pack $box.label -side left -fill y -padx 2 -pady 3
+	pack $box.entry -side left -anchor n -pady 0
+	pack $box -side left -fill both
+
+	set height [expr \
+	    [winfo reqheight $box.entry] - \
+	    2*([$box.entry cget -highlightthickness] + [$box.entry cget -bd])]
+
+	canvas $f.color -height $height\
+	    -width $data(BARS_WIDTH) -relief sunken -bd 2
+	canvas $f.sel -height $data(PLGN_HEIGHT) \
+	    -width $data(canvasWidth) -highlightthickness 0
+	pack $f.color -expand yes -fill both
+	pack $f.sel -expand yes -fill both
+
+	pack $f -side top -fill x -padx 0 -pady 2
+
+	set data($color,entry) $box.entry
+	set data($color,col) $f.color
+	set data($color,sel) $f.sel
+
+	bind $data($color,col) <Configure> \
+	    "tkColorDialog_DrawColorScale $w $color 1"
+	bind $data($color,col) <Enter> \
+	    "tkColorDialog_EnterColorBar $w $color"
+	bind $data($color,col) <Leave> \
+	    "tkColorDialog_LeaveColorBar $w $color"
+
+	bind $data($color,sel) <Enter> \
+	    "tkColorDialog_EnterColorBar $w $color"
+	bind $data($color,sel) <Leave> \
+	    "tkColorDialog_LeaveColorBar $w $color"
+	
+	bind $box.entry <Return> "tkColorDialog_HandleRGBEntry $w"
+    }
+
+    pack $stripsFrame -side left -fill both -padx 4 -pady 10
+
+    # The selFrame contains a frame that demonstrates the currently
+    # selected color
+    #
+    set selFrame [frame $topFrame.sel]
+    set lab [label $selFrame.lab -text "Selection:" -under 0 -anchor sw]
+    set ent [entry $selFrame.ent -textvariable [format %s $w](selection) \
+	-width 16]
+    set f1  [frame $selFrame.f1 -relief sunken -bd 2]
+    set data(finalCanvas) [frame $f1.demo -bd 0 -width 100 -height 70]
+
+    pack $lab $ent -side top -fill x -padx 4 -pady 2
+    pack $f1 -expand yes -anchor nw -fill both -padx 6 -pady 10
+    pack $data(finalCanvas) -expand yes -fill both
+
+    bind $ent <Return> "tkColorDialog_HandleSelEntry $w"
+
+    pack $selFrame -side left -fill none -anchor nw
+    pack $topFrame -side top -expand yes -fill both -anchor nw
+
+    # the botFrame frame contains the buttons
+    #
+    set botFrame [frame $w.bot -relief raised -bd 1]
+    button $botFrame.ok     -text OK            -width 8 -under 0 \
+	-command "tkColorDialog_OkCmd $w"
+    button $botFrame.cancel -text Cancel        -width 8 -under 0 \
+	-command "tkColorDialog_CancelCmd $w"
+
+    set data(okBtn)      $botFrame.ok
+    set data(cancelBtn)  $botFrame.cancel
+ 
+    pack $botFrame.ok $botFrame.cancel \
+	-padx 10 -pady 10 -expand yes -side left
+    pack $botFrame -side bottom -fill x
+
+
+    # Accelerator bindings
+
+    bind $w <Alt-r> "focus $data(red,entry)"
+    bind $w <Alt-g> "focus $data(green,entry)"
+    bind $w <Alt-b> "focus $data(blue,entry)"
+    bind $w <Alt-s> "focus $ent"
+    bind $w <KeyPress-Escape> "tkButtonInvoke $data(cancelBtn)"
+    bind $w <Alt-c> "tkButtonInvoke $data(cancelBtn)"
+    bind $w <Alt-o> "tkButtonInvoke $data(okBtn)"
+
+    wm protocol $w WM_DELETE_WINDOW "tkColorDialog_CancelCmd $w"
+}
+
+# tkColorDialog_SetRGBValue --
+#
+#	Sets the current selection of the dialog box
+#
+proc tkColorDialog_SetRGBValue {w color} {
+    upvar #0 $w data 
+
+    set data(red,intensity)   [lindex $color 0]
+    set data(green,intensity) [lindex $color 1]
+    set data(blue,intensity)  [lindex $color 2]
+    
+    tkColorDialog_RedrawColorBars $w all
+
+    # Now compute the new x value of each colorbars pointer polygon
+    foreach color { red green blue } {
+	set x [tkColorDialog_RgbToX $w $data($color,intensity)]
+	tkColorDialog_MoveSelector $w $data($color,sel) $color $x 0
+    }
+}
+
+# tkColorDialog_XToRgb --
+#
+#	Converts a screen coordinate to intensity
+#
+proc tkColorDialog_XToRgb {w x} {
+    upvar #0 $w data
+    
+    return [expr ($x * $data(intensityIncr))/ $data(colorbarWidth)]
+}
+
+# tkColorDialog_RgbToX
+#
+#	Converts an intensity to screen coordinate.
+#
+proc tkColorDialog_RgbToX {w color} {
+    upvar #0 $w data
+    
+    return [expr ($color * $data(colorbarWidth)/ $data(intensityIncr))]
+}
+
+
+# tkColorDialog_DrawColorScale --
+# 
+#	Draw color scale is called whenever the size of one of the color
+#	scale canvases is changed.
+#
+proc tkColorDialog_DrawColorScale {w c {create 0}} {
+    global lines
+    upvar #0 $w data
+
+    # col: color bar canvas
+    # sel: selector canvas
+    set col $data($c,col)
+    set sel $data($c,sel)
+
+    # First handle the case that we are creating everything for the first time.
+    if $create {
+	# First remove all the lines that already exist.
+	if { $data(lines,$c,last) > $data(lines,$c,start)} {
+	    for {set i $data(lines,$c,start)} \
+		{$i <= $data(lines,$c,last)} { incr i} {
+		$sel delete $i
+	    }
+	}
+	# Delete the selector if it exists
+	if [info exists data($c,index)] {
+	    $sel delete $data($c,index)
+	}
+	
+	# Draw the selection polygons
+	tkColorDialog_CreateSelector $w $sel $c
+	$sel bind $data($c,index) <ButtonPress-1> \
+	    "tkColorDialog_StartMove $w $sel $c %x $data(selPad) 1"
+	$sel bind $data($c,index) <B1-Motion> \
+	    "tkColorDialog_MoveSelector $w $sel $c %x $data(selPad)"
+	$sel bind $data($c,index) <ButtonRelease-1> \
+	    "tkColorDialog_ReleaseMouse $w $sel $c %x $data(selPad)"
+
+	set height [winfo height $col]
+	# Create an invisible region under the colorstrip to catch mouse clicks
+	# that aren't on the selector.
+	set data($c,clickRegion) [$sel create rectangle 0 0 \
+	    $data(canvasWidth) $height -fill {} -outline {}]
+
+	bind $col <ButtonPress-1> \
+	    "tkColorDialog_StartMove $w $sel $c %x $data(colorPad)"
+	bind $col <B1-Motion> \
+	    "tkColorDialog_MoveSelector $w $sel $c %x $data(colorPad)"
+	bind $col <ButtonRelease-1> \
+	    "tkColorDialog_ReleaseMouse $w $sel $c %x $data(colorPad)"
+
+	$sel bind $data($c,clickRegion) <ButtonPress-1> \
+	    "tkColorDialog_StartMove $w $sel $c %x $data(selPad)"
+	$sel bind $data($c,clickRegion) <B1-Motion> \
+	    "tkColorDialog_MoveSelector $w $sel $c %x $data(selPad)"
+	$sel bind $data($c,clickRegion) <ButtonRelease-1> \
+	    "tkColorDialog_ReleaseMouse $w $sel $c %x $data(selPad)"
+    } else {
+	# l is the canvas index of the first colorbar.
+	set l $data(lines,$c,start)
+    }
+    
+    # Draw the color bars.
+    set highlightW [expr \
+	[$col cget -highlightthickness] + [$col cget -bd]]
+    for {set i 0} { $i < $data(NUM_COLORBARS)} { incr i} {
+	set intensity [expr $i * $data(intensityIncr)]
+	set startx [expr $i * $data(colorbarWidth) + $highlightW]
+	if { $c == "red" } {
+	    set color [format "#%02x%02x%02x" \
+			   $intensity \
+			   $data(green,intensity) \
+			   $data(blue,intensity)]
+	} elseif { $c == "green" } {
+	    set color [format "#%02x%02x%02x" \
+			   $data(red,intensity) \
+			   $intensity \
+			   $data(blue,intensity)]
+	} else {
+	    set color [format "#%02x%02x%02x" \
+			   $data(red,intensity) \
+			   $data(green,intensity) \
+			   $intensity]
+	}
+
+	if $create {
+	    set index [$col create rect $startx $highlightW \
+		[expr $startx +$data(colorbarWidth)] \
+		[expr [winfo height $col] + $highlightW]\
+	        -fill $color -outline $color]
+	} else {
+	    $col itemconf $l -fill $color -outline $color
+	    incr l
+	}
+    }
+    $sel raise $data($c,index)
+
+    if $create {
+	set data(lines,$c,last) $index
+	set data(lines,$c,start) [expr $index - $data(NUM_COLORBARS) + 1 ]
+    }
+
+    tkColorDialog_RedrawFinalColor $w
+}
+
+# tkColorDialog_CreateSelector --
+#
+#	Creates and draws the selector polygon at the position
+#	$data($c,intensity).
+#
+proc tkColorDialog_CreateSelector {w sel c } {
+    upvar #0 $w data
+    set data($c,index) [$sel create polygon \
+	0 $data(PLGN_HEIGHT) \
+	$data(PLGN_WIDTH) $data(PLGN_HEIGHT) \
+	$data(indent) 0]
+    set data($c,x) [tkColorDialog_RgbToX $w $data($c,intensity)]
+    $sel move $data($c,index) $data($c,x) 0
+}
+
+# tkColorDialog_RedrawFinalColor
+#
+#	Combines the intensities of the three colors into the final color
+#
+proc tkColorDialog_RedrawFinalColor {w} {
+    upvar #0 $w data
+
+    set color [format "#%02x%02x%02x" $data(red,intensity) \
+	$data(green,intensity) $data(blue,intensity)]
+    
+    $data(finalCanvas) conf -bg $color
+    set data(finalColor) $color
+    set data(selection) $color
+    set data(finalRGB) [list \
+	$data(red,intensity) \
+	$data(green,intensity) \
+	$data(blue,intensity)]
+}
+
+# tkColorDialog_RedrawColorBars --
+#
+# Only redraws the colors on the color strips that were not manipulated.
+# Params: color of colorstrip that changed. If color is not [red|green|blue]
+#         Then all colorstrips will be updated
+#
+proc tkColorDialog_RedrawColorBars {w colorChanged} {
+    upvar #0 $w data
+
+    switch $colorChanged {
+	red { 
+	    tkColorDialog_DrawColorScale $w green
+	    tkColorDialog_DrawColorScale $w blue
+	}
+	green {
+	    tkColorDialog_DrawColorScale $w red
+	    tkColorDialog_DrawColorScale $w blue
+	}
+	blue {
+	    tkColorDialog_DrawColorScale $w red
+	    tkColorDialog_DrawColorScale $w green
+	}
+	default {
+	    tkColorDialog_DrawColorScale $w red
+	    tkColorDialog_DrawColorScale $w green
+	    tkColorDialog_DrawColorScale $w blue
+	}
+    }
+    tkColorDialog_RedrawFinalColor $w
+}
+
+#----------------------------------------------------------------------
+#			Event handlers
+#----------------------------------------------------------------------
+
+# tkColorDialog_StartMove --
+#
+#	Handles a mousedown button event over the selector polygon.
+#	Adds the bindings for moving the mouse while the button is
+#	pressed.  Sets the binding for the button-release event.
+# 
+# Params: sel is the selector canvas window, color is the color of the strip.
+#
+proc tkColorDialog_StartMove {w sel color x delta {dontMove 0}} {
+    upvar #0 $w data
+
+    if !$dontMove {
+	tkColorDialog_MoveSelector $w $sel $color $x $delta
+    }
+}
+
+# tkColorDialog_MoveSelector --
+# 
+# Moves the polygon selector so that its middle point has the same
+# x value as the specified x. If x is outside the bounds [0,255],
+# the selector is set to the closest endpoint.
+#
+# Params: sel is the selector canvas, c is [red|green|blue]
+#         x is a x-coordinate.
+#
+proc tkColorDialog_MoveSelector {w sel color x delta} {
+    upvar #0 $w data
+
+    incr x -$delta
+
+    if { $x < 0 } {
+	set x 0
+    } elseif { $x >= $data(BARS_WIDTH)} {
+	set x [expr $data(BARS_WIDTH) - 1]
+    }
+    set diff [expr  $x - $data($color,x)]
+    $sel move $data($color,index) $diff 0
+    set data($color,x) [expr $data($color,x) + $diff]
+    
+    # Return the x value that it was actually set at
+    return $x
+}
+
+# tkColorDialog_ReleaseMouse
+#
+# Removes mouse tracking bindings, updates the colorbars.
+#
+# Params: sel is the selector canvas, color is the color of the strip,
+#         x is the x-coord of the mouse.
+#
+proc tkColorDialog_ReleaseMouse {w sel color x delta} {
+    upvar #0 $w data 
+
+    set x [tkColorDialog_MoveSelector $w $sel $color $x $delta]
+    
+    # Determine exactly what color we are looking at.
+    set data($color,intensity) [tkColorDialog_XToRgb $w $x]
+
+    tkColorDialog_RedrawColorBars $w $color
+}
+
+# tkColorDialog_ResizeColorbars --
+#
+#	Completely redraws the colorbars, including resizing the
+#	colorstrips
+#
+proc tkColorDialog_ResizeColorBars {w} {
+    upvar #0 $w data
+    
+    if { ($data(BARS_WIDTH) < $data(NUM_COLORBARS)) || 
+	 (($data(BARS_WIDTH) % $data(NUM_COLORBARS)) != 0)} {
+	set data(BARS_WIDTH) $data(NUM_COLORBARS)
+    }
+    tkColorDialog_InitValues $w
+    foreach color { red green blue } {
+	$data($color,col) conf -width $data(canvasWidth)
+	tkColorDialog_DrawColorScale $w $color 1
+    }
+}
+
+# tkColorDialog_HandleSelEntry --
+#
+#	Handles the return keypress event in the "Selection:" entry
+#
+proc tkColorDialog_HandleSelEntry {w} {
+    upvar #0 $w data
+
+    set text [string trim $data(selection)]
+    # Check to make sure that the color is valid
+    if [catch {set color [winfo rgb . $text]} ] {
+	set data(selection) $data(finalColor)
+	return
+    }
+    
+    set R [expr [lindex $color 0]/0x100]
+    set G [expr [lindex $color 1]/0x100]
+    set B [expr [lindex $color 2]/0x100]
+
+    tkColorDialog_SetRGBValue $w "$R $G $B"
+    set data(selection) $text
+}
+
+# tkColorDialog_HandleRGBEntry --
+#
+#	Handles the return keypress event in the R, G or B entry
+#
+proc tkColorDialog_HandleRGBEntry {w} {
+    upvar #0 $w data
+
+    foreach c {red green blue} {
+	if [catch {
+	    set data($c,intensity) [expr int($data($c,intensity))]
+	}] {
+	    set data($c,intensity) 0
+	}
+
+	if {$data($c,intensity) < 0} {
+	    set data($c,intensity) 0
+	}
+	if {$data($c,intensity) > 255} {
+	    set data($c,intensity) 255
+	}
+    }
+
+    tkColorDialog_SetRGBValue $w "$data(red,intensity) $data(green,intensity) \
+	$data(blue,intensity)"
+}    
+
+# mouse cursor enters a color bar
+#
+proc tkColorDialog_EnterColorBar {w color} {
+    upvar #0 $w data
+
+    $data($color,sel) itemconfig $data($color,index) -fill red
+}
+
+# mouse leaves enters a color bar
+#
+proc tkColorDialog_LeaveColorBar {w color} {
+    upvar #0 $w data
+
+    $data($color,sel) itemconfig $data($color,index) -fill black
+}
+
+# user hits OK button
+#
+proc tkColorDialog_OkCmd {w} {
+    global tkPriv
+    upvar #0 $w data
+
+    set tkPriv(selectColor) $data(finalColor)
+}
+
+# user hits Cancel button
+#
+proc tkColorDialog_CancelCmd {w} {
+    global tkPriv
+
+    set tkPriv(selectColor) ""
+}
+