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<html>
<head>
<meta name="description" content="Pmw - a toolkit for building high-level compound widgets in Python">
<meta name="content" content="python, megawidget, mega widget, compound widget, gui, tkinter">
<title>Pmw.Color reference manual</title>
</head>
<body bgcolor="#ffffff" text="#000000" link="#0000ee"
vlink="551a8b" alink="ff0000">
<h1 ALIGN="CENTER">Pmw.Color</h1>
<p>
<dl>
<dt> <h3>Description</h3><dd>
<p>
This is a set of functions for manipulating colors and for
modifying the color scheme of an application or a widget.
Colors can be represented in a number of ways:</p>
<dl><dt><strong>name</strong><dd>a standard color name, eg <code>'orange'</code> or <code>'#ffa500'</code></p>
<dt><strong>rgb</strong><dd>a 3-element sequence of red, green and blue intensities
each between 0.0 (dark) and 1.0 (light), eg <code>[1.0, 0.6, 0.0]</code>.</p>
<dt><strong>hsi</strong><dd>a 3-element sequence (<em>hue</em>, <em>saturation</em>,
<em>intensity</em>). The value of <em>hue</em> is between 0.0 and <strong>2pi</strong>
(6.28318) giving a range of colors covering, in order, red,
orange, yellow green, cyan, blue, magenta and back to red.
The value of <em>saturation</em> is between 0.0 (grey) and 1.0
(brilliant) and the value of <em>intensity</em> is between 0.0 (dark)
and 1.0 (bright).</p>
</dl>
<p> <strong>brightness</strong> As used in these functions, the brightness of a color
is the brightness as registered by the human eye. For example,
even though the colors red, blue and yellow have the same
intensity (1.0), they have different brightnesses, 0.299, 0.114
and 0.886 respectively, reflecting the different way these colors
appear to the eye. The brightness of a color is a value between
0.0 (dark) and 1.0 (bright).</p>
<p> <strong>color scheme</strong> A color scheme is a set of colors defined for each
of the default color options in the Tk option database. Color
schemes can be used in two ways. Firstly, using
<code>Pmw.Color.setscheme()</code>, the Tk option database can be set to the
values in the color scheme. This will not have any effect on
currently existing widgets, but any new widgets created after
setting the options will have these colors as their defaults.
Secondly, using <code>Pmw.Color.changecolor()</code> the color scheme can be
used to change the colors of a widget and all its child widgets.</p>
<p> A color scheme is specified by defining one or more color options
(one of the defined options must be <code>background</code>). Not all
options need be specified - if any options are not defined, they
are calculated from the other colors. These are the options used
by a color scheme, together with their values if not specified:</p>
<dl><dd><pre> background: (must be specified)
foreground: black
activeForeground: same as foreground
insertBackground: same as foreground
selectForeground: same as foreground
highlightColor: same as foreground
disabledForeground: between fg and bg but closer to bg
highlightBackground: same as background
activeBackground: a little lighter that bg
selectBackground: a little darker that bg
troughColor: a little darker that bg
selectColor: yellow</pre></dl>
<p></p>
<dt> <h3>Functions</h3><dd>
The following functions are available.<p>
<dl>
<dt> <strong>Pmw.Color.average</strong>(<em>col1</em>, <em>col2</em>, <em>fraction</em>)<dd>
<p></p>
</dt>
<dt> <strong>Pmw.Color.bordercolors</strong>(<em>root</em>, <em>color</em>)<dd>
<p></p>
</dt>
<dt> <strong>Pmw.Color.changebrightness</strong>(<em>root</em>, <em>colorName</em>, <em>brightness</em>)<dd>
Find the hue of the color <em>colorName</em> and return a color of this
hue with the required <em>brightness</em>.</p>
<p></p>
</dt>
<dt> <strong>Pmw.Color.changecolor</strong>(<em>widget</em>, <em>background</em> = <strong>None</strong>, **<em>kw</em>)<dd>
Change the color of <em>widget</em> and all its child widgets according
to the color scheme specified by the other arguments. This is done
by modifying all of the color options of existing widgets that
have the default value. The color options are the lower case
versions of those described in the <strong>color scheme</strong> section. Any
options which are different to the previous color scheme (or the
defaults, if this is the first call) are not changed.</p>
<p> For example to change a widget to have a red color scheme with a
white foreground:</p>
<dl><dd><pre> Pmw.Color.changecolor(widget,
background = 'red3', foreground = 'white')</pre></dl>
<p> The colors of widgets created after this call will not be
affected.</p>
<p> Note that <em>widget</em> must be a Tk widget or toplevel. To change the
color of a Pmw megawidget, use it's <strong>hull</strong> component. For example:</p>
<dl><dd><pre> widget = megawidget.component('hull')
Pmw.Color.changecolor(widget, background = 'red3')</pre></dl>
<p></p>
</dt>
<dt> <strong>Pmw.Color.correct</strong>(<em>rgb</em>, <em>correction</em>)<dd>
<p></p>
</dt>
<dt> <strong>Pmw.Color.getdefaultpalette</strong>(<em>root</em>)<dd>
Return a dictionary of the default values of the color options
described in the <strong>color scheme</strong> section.</p>
<p> To do this, a few widgets are created as children of <em>root</em>, their
defaults are queried, and then the widgets are destroyed. (Tk
supplies no other way to get widget default values.)</p>
<p> Note that <em>root</em> must be a Tk widget or toplevel. To use a Pmw
megawidget as the root, use it's <strong>hull</strong> component. For example:</p>
<dl><dd><pre> root = megawidget.component('hull')
Pmw.Color.getdefaultpalette(root)</pre></dl>
<p></p>
</dt>
<dt> <strong>Pmw.Color.hsi2rgb</strong>(<em>hue</em>, <em>saturation</em>, <em>intensity</em>)<dd>
Return a list of <strong>rgb</strong> values of the color corresponding to <em>hue</em>,
<em>saturation</em> and <em>intensity</em>.</p>
<p></p>
</dt>
<dt> <strong>Pmw.Color.hsi2saturation</strong>(<em>brightness</em>, <em>h</em>, <em>i</em>)<dd>
<p></p>
</dt>
<dt> <strong>Pmw.Color.hue2name</strong>(<em>hue</em>, <em>brightness</em> = <strong>None</strong>)<dd>
Return the color with the specified <em>hue</em> and <em>brightness</em>. If
<em>hue</em> is <strong>None</strong>, return a grey of the requested brightness.
Otherwise, the value of <em>hue</em> should be as described above.</p>
<p></p>
</dt>
<dt> <strong>Pmw.Color.rgb2brightness</strong>(<em>rgb</em>)<dd>
<p></p>
</dt>
<dt> <strong>Pmw.Color.rgb2hsi</strong>(<em>rgb</em>)<dd>
Return a tuple (<em>hue</em>, <em>saturation</em>, <em>intensity</em>) corresponding to
the color specified by the <em>rgb</em> sequence.</p>
<p></p>
</dt>
<dt> <strong>Pmw.Color.rgb2name</strong>(<em>rgb</em>)<dd>
<p></p>
</dt>
<dt> <strong>Pmw.Color.setscheme</strong>(<em>root</em>, <em>background</em> = <strong>None</strong>, **<em>kw</em>)<dd>
Set the color scheme for the application by setting default colors
(in the Tk option database of the root window of <em>root</em>) according
to the color scheme specified by the other arguments.</p>
<p> For example to initialise an application to have a red color
scheme with a white foreground:</p>
<dl><dd><pre> Pmw.Color.setscheme(root,
background = 'red3', foreground = 'white')</pre></dl>
<p> This function does not modify the colors of already existing
widgets. Use <strong>Pmw.Color.changecolor()</strong> to do this.</p>
<p> Note that <em>root</em> must be a Tk widget or toplevel. To use the Tk
option database of the root window or a Pmw megawidget, use the
megawidget's <strong>hull</strong> component. For example:</p>
<dl><dd><pre> root = megawidget.component('hull')
Pmw.Color.setscheme(root, background = 'red3')</pre></dl>
<p></p>
</dt>
<dt> <strong>Pmw.Color.spectrum</strong>(<em>numColors</em>, <em>correction</em> = <strong>1.0</strong>, <em>saturation</em> = <strong>1.0</strong>, <em>intensity</em> = <strong>1.0</strong>, <em>extraOrange</em> = <strong>1</strong>, <em>returnHues</em> = <strong>0</strong>)<dd>
<p></p>
</dt>
</dl>
</dl>
<center><P ALIGN="CENTER">
<IMG SRC = blue_line.gif ALT = "" WIDTH=320 HEIGHT=5>
</p></center>
<font size=-1>
<center><P ALIGN="CENTER">
<a href="index.html">Home</a>.
Pmw 0.8.5
Maintainer
<a href="mailto:gregm@iname.com">gregm@iname.com</a>.
9 Feb 2001
</p></center>
</font>
</body>
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