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<!DOCTYPE HTML PUBLIC "-//Netscape_Microsoft//DTD HTML 3.0//EN">
<HTML>

<!-- This file generated using the Python HTMLgen module. -->
<HEAD>
  <META NAME="GENERATOR" CONTENT="HTMLgen 1.1">
        <TITLE>PmwColor.py</TITLE>
</HEAD>
<BODY BGCOLOR="#FFFFFF">
<PRE>
<FONT COLOR="#DD0000"># Functions for converting colors and modifying the color scheme of</FONT>
<FONT COLOR="#DD0000"># an application.</FONT>

import math
import string
import sys
import Tkinter

_PI = math.pi
_TWO_PI = _PI * 2
_THIRD_PI = _PI / 3
_SIXTH_PI = _PI / 6

<STRONG>def setscheme</STRONG>(root, background=None, **kw):
    root = root._root()
    palette = apply(_calcPalette, (root, background,), kw)
    for option, value in palette.items():
	root.option_add(<FONT COLOR="#009900">'*'</FONT> + option, value, <FONT COLOR="#009900">'widgetDefault'</FONT>)

<STRONG>def getdefaultpalette</STRONG>(root):
    <FONT COLOR="#DD0000"># Return the default values of all options, using the defaults</FONT>
    <FONT COLOR="#DD0000"># from a few widgets.</FONT>

    ckbtn = Tkinter.Checkbutton(root)
    entry = Tkinter.Entry(root)
    scbar = Tkinter.Scrollbar(root)

    orig = {}
    orig[<FONT COLOR="#009900">'activeBackground'</FONT>] = ckbtn.configure(<FONT COLOR="#009900">'activebackground'</FONT>)[4]
    orig[<FONT COLOR="#009900">'activeForeground'</FONT>] = ckbtn.configure(<FONT COLOR="#009900">'activeforeground'</FONT>)[4]
    orig[<FONT COLOR="#009900">'background'</FONT>] = ckbtn.configure(<FONT COLOR="#009900">'background'</FONT>)[4]
    orig[<FONT COLOR="#009900">'disabledForeground'</FONT>] = ckbtn.configure(<FONT COLOR="#009900">'disabledforeground'</FONT>)[4]
    orig[<FONT COLOR="#009900">'foreground'</FONT>] = ckbtn.configure(<FONT COLOR="#009900">'foreground'</FONT>)[4]
    orig[<FONT COLOR="#009900">'highlightBackground'</FONT>] = ckbtn.configure(<FONT COLOR="#009900">'highlightbackground'</FONT>)[4]
    orig[<FONT COLOR="#009900">'highlightColor'</FONT>] = ckbtn.configure(<FONT COLOR="#009900">'highlightcolor'</FONT>)[4]
    orig[<FONT COLOR="#009900">'insertBackground'</FONT>] = entry.configure(<FONT COLOR="#009900">'insertbackground'</FONT>)[4]
    orig[<FONT COLOR="#009900">'selectColor'</FONT>] = ckbtn.configure(<FONT COLOR="#009900">'selectcolor'</FONT>)[4]
    orig[<FONT COLOR="#009900">'selectBackground'</FONT>] = entry.configure(<FONT COLOR="#009900">'selectbackground'</FONT>)[4]
    orig[<FONT COLOR="#009900">'selectForeground'</FONT>] = entry.configure(<FONT COLOR="#009900">'selectforeground'</FONT>)[4]
    orig[<FONT COLOR="#009900">'troughColor'</FONT>] = scbar.configure(<FONT COLOR="#009900">'troughcolor'</FONT>)[4]

    ckbtn.destroy()
    entry.destroy()
    scbar.destroy()

    return orig

<FONT COLOR="#DD0000">#======================================================================</FONT>

<FONT COLOR="#DD0000"># Functions dealing with brightness, hue, saturation and intensity of colors.</FONT>

<STRONG>def changebrightness</STRONG>(root, colorName, brightness):
    <FONT COLOR="#DD0000"># Convert the color name into its hue and back into a color of the</FONT>
    <FONT COLOR="#DD0000"># required brightness.</FONT>

    if colorName[0] == <FONT COLOR="#009900">'#'</FONT>:
	<FONT COLOR="#DD0000"># Extract rgb information from the color name itself, assuming</FONT>
	<FONT COLOR="#DD0000"># it is either #rgb, #rrggbb, #rrrgggbbb, or #rrrrggggbbbb</FONT>
	<FONT COLOR="#DD0000"># This is useful, since tk may return incorrect rgb values if</FONT>
	<FONT COLOR="#DD0000"># the colormap is full - it will return the rbg values of the</FONT>
	<FONT COLOR="#DD0000"># closest color available.</FONT>
        colorName = colorName[1:]
        digits = len(colorName) / 3
        factor = 16 ** (4 - digits)
        rgb = (
            string.atoi(colorName[0:digits], 16) * factor,
            string.atoi(colorName[digits:digits * 2], 16) * factor,
            string.atoi(colorName[digits * 2:digits * 3], 16) * factor,
        )
    else:
	<FONT COLOR="#DD0000"># We have no choice but to ask Tk what the rgb values are.</FONT>
	rgb = root.winfo_rgb(colorName)

    f = float(256 * 256 - 1) <FONT COLOR="#DD0000"># max size of rgb values returned from Tk</FONT>
    rgb = (rgb[0] / f, rgb[1] / f, rgb[2] / f)
    hue, saturation, intensity = rgb2hsi(rgb)
    if saturation == 0.0:
        hue = None
    return hue2name(hue, brightness)

<STRONG>def hue2name</STRONG>(hue, brightness = None):
    <FONT COLOR="#DD0000"># Convert the requested hue and brightness into a color name.  If</FONT>
    <FONT COLOR="#DD0000"># hue is None, return a grey of the requested brightness.</FONT>

    if hue is None:
	h = 0.0
	s = 0.0
	rgb = hsi2rgb(0.0, 0.0, brightness)
    else:
	while hue < 0:
	    hue = hue + _TWO_PI
	while hue >= _TWO_PI:
	    hue = hue - _TWO_PI

	h = hue
	rgb = hsi2rgb(h, 1.0, 1.0)
	if brightness is not None:
	    b = rgb2brightness(rgb)
	    i = 1.0 - (1.0 - brightness) * b
	    s = hsi2saturation(brightness, h, i)
	    rgb = hsi2rgb(h, s, i)

    return rgb2name(rgb)

<STRONG>def hsi2saturation</STRONG>(brightness, h, i):
    if h >= _TWO_PI:
	h = h - _TWO_PI
    h = h / _THIRD_PI
    f = h - math.floor(h)

    pp = i
    pq = i * f
    pt = i - i * f
    pv = 0

    h = int(h)
    if   h == 0: rgb = (pv, pt, pp)
    elif h == 1: rgb = (pq, pv, pp)
    elif h == 2: rgb = (pp, pv, pt)
    elif h == 3: rgb = (pp, pq, pv)
    elif h == 4: rgb = (pt, pp, pv)
    elif h == 5: rgb = (pv, pp, pq)

    return (i - brightness) / rgb2brightness(rgb)

<STRONG>def hsi2rgb</STRONG>(hue, saturation, intensity):
    i = intensity
    if saturation == 0:
	rgb = [i, i, i]
    else:
	hue = hue / _THIRD_PI
	f = hue - math.floor(hue)
	p = i * (1.0 - saturation)
	q = i * (1.0 - saturation * f)
	t = i * (1.0 - saturation * (1.0 - f))

	hue = int(hue)
	if   hue == 0: rgb = [i, t, p]
	elif hue == 1: rgb = [q, i, p]
	elif hue == 2: rgb = [p, i, t]
	elif hue == 3: rgb = [p, q, i]
	elif hue == 4: rgb = [t, p, i]
	elif hue == 5: rgb = [i, p, q]

    for index in range(3):
	val = rgb[index]
	if val < 0.0:
	    val = 0.0
	if val > 1.0:
	    val = 1.0
	rgb[index] = val

    return rgb

<STRONG>def average</STRONG>(col1, col2, fraction):
    return (
	col2[0] * fraction + col1[0] * (1.0 - fraction),
	col2[1] * fraction + col1[1] * (1.0 - fraction),
	col2[2] * fraction + col1[2] * (1.0 - fraction)
    )

<STRONG>def rgb2name</STRONG>(rgb):
    return <FONT COLOR="#009900">'#%02x%02x%02x'</FONT> % \
        (int(rgb[0] * 255), int(rgb[1] * 255), int(rgb[2] * 255))

<STRONG>def rgb2brightness</STRONG>(rgb):
    rf = 0.299
    gf = 0.587
    bf = 0.114
    return rf * rgb[0] + gf * rgb[1] + bf * rgb[2]

<STRONG>def rgb2hsi</STRONG>(rgb):
    max = 0.0
    min = 1.0
    for index in range(3):
	if rgb[index] > max:
	    max = rgb[index]
	if rgb[index] < min:
	    min = rgb[index]

    intensity = max
    if max != 0:
      saturation  = (max - min) / max
    else:
      saturation = 0.0

    hue = 0.0
    if saturation != 0.0:
	c = []
	for index in range(3):
	    c.append((max - rgb[index]) / (max - min))

	if rgb[0] == max:
	    hue = c[2] - c[1]
	elif rgb[1] == max:
	    hue = 2 + c[0] - c[2]
	elif rgb[2] == max:
	    hue = 4 + c[1] - c[0]

	hue = hue * _THIRD_PI
	if hue < 0.0:
	    hue = hue + _TWO_PI

    return (hue, saturation, intensity)

<STRONG>def _calcPalette</STRONG>(root, background=None, **kw):
    <FONT COLOR="#DD0000"># Create a map that has the complete new palette.  If some colors</FONT>
    <FONT COLOR="#DD0000"># aren't specified, compute them from other colors that are specified.</FONT>
    new = {}
    for key, value in kw.items():
	new[key] = value
    if background is not None:
	new[<FONT COLOR="#009900">'background'</FONT>] = background
    if not new.has_key(<FONT COLOR="#009900">'background'</FONT>):
	raise ValueError, <FONT COLOR="#009900">'must specify a background color'</FONT>

    if not new.has_key(<FONT COLOR="#009900">'foreground'</FONT>):
	new[<FONT COLOR="#009900">'foreground'</FONT>] = <FONT COLOR="#009900">'black'</FONT>

    f = float(256 * 256 - 1) <FONT COLOR="#DD0000"># max size of rgb values returned from Tk</FONT>
    bg = root.winfo_rgb(new[<FONT COLOR="#009900">'background'</FONT>])
    bg = (bg[0] / f, bg[1] / f, bg[2] / f)
    fg = root.winfo_rgb(new[<FONT COLOR="#009900">'foreground'</FONT>])
    fg = (fg[0] / f, fg[1] / f, fg[2] / f)

    for i in (<FONT COLOR="#009900">'activeForeground'</FONT>, <FONT COLOR="#009900">'insertBackground'</FONT>, <FONT COLOR="#009900">'selectForeground'</FONT>,
	    <FONT COLOR="#009900">'highlightColor'</FONT>):
	if not new.has_key(i):
	    new[i] = new[<FONT COLOR="#009900">'foreground'</FONT>]

    if not new.has_key(<FONT COLOR="#009900">'disabledForeground'</FONT>):
	newCol = average(bg, fg, 0.3)
	new[<FONT COLOR="#009900">'disabledForeground'</FONT>] = rgb2name(newCol)

    if not new.has_key(<FONT COLOR="#009900">'highlightBackground'</FONT>):
	new[<FONT COLOR="#009900">'highlightBackground'</FONT>] = new[<FONT COLOR="#009900">'background'</FONT>]

    <FONT COLOR="#DD0000"># Set &lt;lighterBg&gt; to a color that is a little lighter that the</FONT>
    <FONT COLOR="#DD0000"># normal background.  To do this, round each color component up by</FONT>
    <FONT COLOR="#DD0000"># 9% or 1/3 of the way to full white, whichever is greater.</FONT>
    lighterBg = []
    for i in range(3):
	lighterBg.append(bg[i])
	inc1 = lighterBg[i] * 0.09
	inc2 = (1.0 - lighterBg[i]) / 3
	if inc1 > inc2:
	    lighterBg[i] = lighterBg[i] + inc1
	else:
	    lighterBg[i] = lighterBg[i] + inc2
	if lighterBg[i] > 1.0:
	    lighterBg[i] = 1.0

    <FONT COLOR="#DD0000"># Set &lt;darkerBg&gt; to a color that is a little darker that the</FONT>
    <FONT COLOR="#DD0000"># normal background.</FONT>
    darkerBg = (bg[0] * 0.9, bg[1] * 0.9, bg[2] * 0.9)

    if not new.has_key(<FONT COLOR="#009900">'activeBackground'</FONT>):
	<FONT COLOR="#DD0000"># If the foreground is dark, pick a light active background.</FONT>
	<FONT COLOR="#DD0000"># If the foreground is light, pick a dark active background.</FONT>
	<FONT COLOR="#DD0000"># XXX This has been disabled, since it does not look very</FONT>
	<FONT COLOR="#DD0000"># good with dark backgrounds. If this is ever fixed, the</FONT>
	<FONT COLOR="#DD0000"># selectBackground and troughColor options should also be fixed.</FONT>

	if rgb2brightness(fg) < 0.5:
	    new[<FONT COLOR="#009900">'activeBackground'</FONT>] = rgb2name(lighterBg)
	else:
	    new[<FONT COLOR="#009900">'activeBackground'</FONT>] = rgb2name(lighterBg)

    if not new.has_key(<FONT COLOR="#009900">'selectBackground'</FONT>):
	new[<FONT COLOR="#009900">'selectBackground'</FONT>] = rgb2name(darkerBg)
    if not new.has_key(<FONT COLOR="#009900">'troughColor'</FONT>):
	new[<FONT COLOR="#009900">'troughColor'</FONT>] = rgb2name(darkerBg)
    if not new.has_key(<FONT COLOR="#009900">'selectColor'</FONT>):
	new[<FONT COLOR="#009900">'selectColor'</FONT>] = <FONT COLOR="#009900">'yellow'</FONT>

    return new

<STRONG>def spectrum</STRONG>(numColors, correction = 1.0, saturation = 1.0, intensity = 1.0,
	extraOrange = 1, returnHues = 0):
    colorList = []
    division = numColors / 7.0
    for index in range(numColors):
	if extraOrange:
	    if index < 2 * division:
		hue = index / division
	    else:
		hue = 2 + 2 * (index - 2 * division) / division
	    hue = hue * _SIXTH_PI
	else:
	    hue = index * _TWO_PI / numColors
	if returnHues:
	    colorList.append(hue)
	else:
	    rgb = hsi2rgb(hue, saturation, intensity)
	    if correction != 1.0:
		rgb = correct(rgb, correction)
	    name = rgb2name(rgb)
	    colorList.append(name)
    return colorList

<STRONG>def correct</STRONG>(rgb, correction):
    correction = float(correction)
    rtn = []
    for index in range(3):
	rtn.append((1 - (1 - rgb[index]) ** correction) ** (1 / correction))
    return rtn

<FONT COLOR="#DD0000">#==============================================================================</FONT>

<STRONG>def _recolorTree</STRONG>(widget, oldpalette, newcolors):
    <FONT COLOR="#DD0000"># Change the colors in a widget and its descendants.</FONT>

    <FONT COLOR="#DD0000"># Change the colors in &lt;widget&gt; and all of its descendants,</FONT>
    <FONT COLOR="#DD0000"># according to the &lt;newcolors&gt; dictionary.  It only modifies</FONT>
    <FONT COLOR="#DD0000"># colors that have their default values as specified by the</FONT>
    <FONT COLOR="#DD0000"># &lt;oldpalette&gt; variable.  The keys of the &lt;newcolors&gt; dictionary</FONT>
    <FONT COLOR="#DD0000"># are named after widget configuration options and the values are</FONT>
    <FONT COLOR="#DD0000"># the new value for that option.</FONT>

    for dbOption in newcolors.keys():
       option = string.lower(dbOption)
       try:
	   value = widget.cget(option)
       except:
	   sys.exc_traceback = None   <FONT COLOR="#DD0000"># Clean up object references</FONT>
	   continue
       if oldpalette is None or value == oldpalette[dbOption]:
	   apply(widget.configure, (), {option : newcolors[dbOption]})

    for child in widget.winfo_children():
       _recolorTree(child, oldpalette, newcolors)

<STRONG>def changecolor</STRONG>(widget, background=None, **kw):
     root = widget._root()
     if not hasattr(widget, <FONT COLOR="#009900">'_Pmw_oldpalette'</FONT>):
	 widget._Pmw_oldpalette = getdefaultpalette(root)
     newpalette = apply(_calcPalette, (root, background,), kw)
     _recolorTree(widget, widget._Pmw_oldpalette, newpalette)
     widget._Pmw_oldpalette = newpalette

</PRE>

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