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author: David Thompson <dthompson2@worcester.edu> 2023-12-28 11:23:49 -0500
committer: David Thompson <dthompson2@worcester.edu> 2023-12-28 11:23:49 -0500
commit: 25c5eac5e6ca1035db1eddd7bea9ac78531da57e (patch)
tree: 96377006bbfee75bcf0ce208c1ef89cbdfa5b803 /manuals/chickadee/Colors.html
parent: 5b2e467a7e5e2ffbb0cbbf2557283be891d8206b (diff)
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-<!--  Copyright (C) 2017-2023  David Thompson dthompson2@worcester.edu
-
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-or any later version published by the Free Software Foundation;
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-Free Documentation License".
-
-A copy of the license is also available from the Free Software
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-
-
-* Chickadee: (chickadee).     Game programming toolkit for Guile.
-
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-<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-<title>Colors (The Chickadee Game Toolkit)</title>
-
-<meta name="description" content="Colors (The Chickadee Game Toolkit)" />
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-<link href="Index.html" rel="index" title="Index" />
-<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents" />
-<link href="Graphics.html" rel="up" title="Graphics" />
-<link href="Textures.html" rel="next" title="Textures" />
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-</head>
-
-<body lang="en">
-<span id="Colors"></span><div class="header">
-<p>
-Next: <a href="Textures.html" accesskey="n" rel="next">Textures</a>, Up: <a href="Graphics.html" accesskey="u" rel="up">Graphics</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index.html" title="Index" rel="index">Index</a>]</p>
-</div>
-<hr />
-<span id="Colors-1"></span><h4 class="subsection">5.3.1 Colors</h4>
-
-<p>Merriam-Webster defines color as &ldquo;a phenomenon of light (such as red,
-brown, pink, or gray) or visual perception that enables one to
-differentiate otherwise identical objects.&rdquo;  In this essay, I
-will&hellip;
-</p>
-<p>Okay, okay.  We all know what colors are.  Chickadee provides a data
-type to represent color and some convenient procedures to work with
-them in the <code>(chickadee graphics color)</code> module.  Colors are made
-up of four components, or channels: red, green, blue, and alpha
-(transparency.)  Each of these values is expressed as a uniform
-floating point value in the range [0, 1].  0 means that color channel
-is unrepresented in the resulting color, whereas 1 means that color
-channel is at full intensity.
-</p>
-<p>Making a color object is easy, and there&rsquo;s a few ways to do it
-depending on what&rsquo;s most convenient.  The first is <code>make-color</code>,
-where you specify each channel exactly as described above.  This is
-fully opaque magenta:
-</p>
-<div class="lisp">
-<pre class="lisp"><span class="syntax-open">(</span><span class="syntax-symbol">make-color</span> <span class="syntax-symbol">1.0</span> <span class="syntax-symbol">0.0</span> <span class="syntax-symbol">1.0</span> <span class="syntax-symbol">1.0</span><span class="syntax-close">)</span>
-</pre></div>
-
-<p>Many people are used to representing colors as 6 or 8 digit
-hexadecimal numbers, so Chickadee also allows that.  Here&rsquo;s magenta,
-again:
-</p>
-<div class="lisp">
-<pre class="lisp"><span class="syntax-open">(</span><span class="syntax-symbol">rgba</span> <span class="syntax-symbol">#xFF00FFFF</span><span class="syntax-close">)</span>
-<span class="syntax-open">(</span><span class="syntax-symbol">rgb</span> <span class="syntax-symbol">#xFF00FF</span><span class="syntax-close">)</span> <span class="syntax-comment">; equivalent to the above
-</span></pre></div>
-
-<dl>
-<dt id="index-make_002dcolor">Procedure: <strong>make-color</strong> <em>r g b a</em></dt>
-<dd><p>Return a new color object with a red value of <var>r</var>, a green value
-of <var>g</var>, a blue value of <var>b</var>, and an alpha (transparency) value
-of <var>a</var>.  All values are clamped to the range [0, 1].
-</p></dd></dl>
-
-<dl>
-<dt id="index-rgba">Procedure: <strong>rgba</strong> <em>color-code</em></dt>
-<dd><p>Return a new color object using the values of the first 32 bits of
-<var>color-code</var>.  Each channel occupies 8 bits.  Starting from the
-most significant bit, red is first, followed by green, then blue, then
-alpha.  Color codes are often represented as 6 or 8 digit hexadecimal
-numbers in various other programs.
-</p></dd></dl>
-
-<dl>
-<dt id="index-rgb">Procedure: <strong>rgb</strong> <em>color-code</em></dt>
-<dd><p>Like <code>rgba</code>, but <var>color-code</var> is a 24 bit code with no alpha
-channel.
-</p></dd></dl>
-
-<dl>
-<dt id="index-color_003f">Procedure: <strong>color?</strong> <em>obj</em></dt>
-<dd><p>Return <code>#t</code> if <var>obj</var> is a color object.
-</p></dd></dl>
-
-<dl>
-<dt id="index-color_002dr">Procedure: <strong>color-r</strong> <em>color</em></dt>
-<dd><p>Return the red channel of <var>color</var>.
-</p></dd></dl>
-
-<dl>
-<dt id="index-color_002dg">Procedure: <strong>color-g</strong> <em>color</em></dt>
-<dd><p>Return the green channel of <var>color</var>.
-</p></dd></dl>
-
-<dl>
-<dt id="index-color_002db">Procedure: <strong>color-b</strong> <em>color</em></dt>
-<dd><p>Return the blue channel of <var>color</var>.
-</p></dd></dl>
-
-<dl>
-<dt id="index-color_002da">Procedure: <strong>color-a</strong> <em>color</em></dt>
-<dd><p>Return the alpha channel of <var>color</var>.
-</p></dd></dl>
-
-<dl>
-<dt id="index-transparency">Procedure: <strong>transparency</strong> <em>alpha</em></dt>
-<dd><p>Return a new color that is white (RGB channels set to 1) with an alpha
-channel value of <var>alpha</var>.  This can be useful for creating a color
-that can be multiplied against another color to make it more
-transparent.
-</p></dd></dl>
-
-<dl>
-<dt id="index-string_002d_003ecolor">Procedure: <strong>string-&gt;color</strong> <em>s</em></dt>
-<dd><p>Convert the hexadecimal color code in the string <var>s</var> to a color
-object.  The following string formats are supported:
-</p>
-<div class="lisp">
-<pre class="lisp"><span class="syntax-open">(</span><span class="syntax-symbol">string-&gt;color</span> <span class="syntax-string">"#FF00FFFF"</span><span class="syntax-close">)</span>
-<span class="syntax-open">(</span><span class="syntax-symbol">string-&gt;color</span> <span class="syntax-string">"FF00FFFF"</span><span class="syntax-close">)</span>
-<span class="syntax-open">(</span><span class="syntax-symbol">string-&gt;color</span> <span class="syntax-string">"#FF00FF"</span><span class="syntax-close">)</span>
-<span class="syntax-open">(</span><span class="syntax-symbol">string-&gt;color</span> <span class="syntax-string">"FF00FF"</span><span class="syntax-close">)</span>
-</pre></div>
-
-</dd></dl>
-
-<dl>
-<dt id="index-color_002a">Procedure: <strong>color*</strong> <em>a b</em></dt>
-<dd><p>Multiply the color <var>a</var> with the color or number <var>b</var> and return
-a new color with the result.
-</p></dd></dl>
-
-<dl>
-<dt id="index-color_002b">Procedure: <strong>color+</strong> <em>a b</em></dt>
-<dd><p>Add the color <var>a</var> to the color <var>b</var> and return a new color with
-the result.
-</p></dd></dl>
-
-<dl>
-<dt id="index-color_002d">Procedure: <strong>color-</strong> <em>a b</em></dt>
-<dd><p>Subtract the color <var>b</var> from the color <var>a</var> and return a new
-color with the result.
-</p></dd></dl>
-
-<dl>
-<dt id="index-color_002dinverse">Procedure: <strong>color-inverse</strong> <em>color</em></dt>
-<dd><p>Invert the red, green, and blue channels of <var>color</var> and return a
-new color with the result.
-</p></dd></dl>
-
-<dl>
-<dt id="index-color_002dlerp">Procedure: <strong>color-lerp</strong> <em>start end alpha</em></dt>
-<dd><p>Linearly interpolate the colors <var>start</var> and <var>end</var> using the
-factor <var>alpha</var>, a number in the range [0, 1].
-</p></dd></dl>
-
-<span id="Stock-Colors"></span><h4 class="subsubsection">5.3.1.1 Stock Colors</h4>
-
-<p>For convenience, Chickadee comes with some basic colors predefined:
-</p>
-<dl>
-<dt id="index-white">Variable: <strong>white</strong></dt>
-</dl>
-
-<dl>
-<dt id="index-black">Variable: <strong>black</strong></dt>
-</dl>
-
-<dl>
-<dt id="index-red">Variable: <strong>red</strong></dt>
-</dl>
-
-<dl>
-<dt id="index-green">Variable: <strong>green</strong></dt>
-</dl>
-
-<dl>
-<dt id="index-blue">Variable: <strong>blue</strong></dt>
-</dl>
-
-<dl>
-<dt id="index-yellow">Variable: <strong>yellow</strong></dt>
-</dl>
-
-<dl>
-<dt id="index-magenta">Variable: <strong>magenta</strong></dt>
-</dl>
-
-<dl>
-<dt id="index-cyan">Variable: <strong>cyan</strong></dt>
-</dl>
-
-<p>For fun, there are also predefined colors for the classic
-<a href="https://en.wikipedia.org/wiki/Tango_Desktop_Project#Palette">Tango color palette</a>.
-</p>
-<dl>
-<dt id="index-tango_002dlight_002dbutter">Variable: <strong>tango-light-butter</strong></dt>
-</dl>
-
-<dl>
-<dt id="index-tango_002dbutter">Variable: <strong>tango-butter</strong></dt>
-</dl>
-
-<dl>
-<dt id="index-tango_002ddark_002dbutter">Variable: <strong>tango-dark-butter</strong></dt>
-</dl>
-
-<dl>
-<dt id="index-tango_002dlight_002dorange">Variable: <strong>tango-light-orange</strong></dt>
-</dl>
-
-<dl>
-<dt id="index-tango_002dorange">Variable: <strong>tango-orange</strong></dt>
-</dl>
-
-<dl>
-<dt id="index-tango_002ddark_002dorange">Variable: <strong>tango-dark-orange</strong></dt>
-</dl>
-
-<dl>
-<dt id="index-tango_002dlight_002dchocolate">Variable: <strong>tango-light-chocolate</strong></dt>
-</dl>
-
-<dl>
-<dt id="index-tango_002dchocolate">Variable: <strong>tango-chocolate</strong></dt>
-</dl>
-
-<dl>
-<dt id="index-tango_002ddark_002dchocolate">Variable: <strong>tango-dark-chocolate</strong></dt>
-</dl>
-
-<dl>
-<dt id="index-tango_002dlight_002dchameleon">Variable: <strong>tango-light-chameleon</strong></dt>
-</dl>
-
-<dl>
-<dt id="index-tango_002dchameleon">Variable: <strong>tango-chameleon</strong></dt>
-</dl>
-
-<dl>
-<dt id="index-tango_002ddark_002dchameleon">Variable: <strong>tango-dark-chameleon</strong></dt>
-</dl>
-
-<dl>
-<dt id="index-tango_002dlight_002dsky_002dblue">Variable: <strong>tango-light-sky-blue</strong></dt>
-</dl>
-
-<dl>
-<dt id="index-tango_002dsky_002dblue">Variable: <strong>tango-sky-blue</strong></dt>
-</dl>
-
-<dl>
-<dt id="index-tango_002ddark_002dsky_002dblue">Variable: <strong>tango-dark-sky-blue</strong></dt>
-</dl>
-
-<dl>
-<dt id="index-tango_002dlight_002dplum">Variable: <strong>tango-light-plum</strong></dt>
-</dl>
-
-<dl>
-<dt id="index-tango_002dplum">Variable: <strong>tango-plum</strong></dt>
-</dl>
-
-<dl>
-<dt id="index-tango_002ddark_002dplum">Variable: <strong>tango-dark-plum</strong></dt>
-</dl>
-
-<dl>
-<dt id="index-tango_002dlight_002dscarlet_002dred">Variable: <strong>tango-light-scarlet-red</strong></dt>
-</dl>
-
-<dl>
-<dt id="index-tango_002dscarlet_002dred">Variable: <strong>tango-scarlet-red</strong></dt>
-</dl>
-
-<dl>
-<dt id="index-tango_002ddark_002dscarlet_002dred">Variable: <strong>tango-dark-scarlet-red</strong></dt>
-</dl>
-
-<dl>
-<dt id="index-tango_002daluminium_002d1">Variable: <strong>tango-aluminium-1</strong></dt>
-</dl>
-
-<dl>
-<dt id="index-tango_002daluminium_002d2">Variable: <strong>tango-aluminium-2</strong></dt>
-</dl>
-
-<dl>
-<dt id="index-tango_002daluminium_002d3">Variable: <strong>tango-aluminium-3</strong></dt>
-</dl>
-
-<dl>
-<dt id="index-tango_002daluminium_002d4">Variable: <strong>tango-aluminium-4</strong></dt>
-</dl>
-
-<dl>
-<dt id="index-tango_002daluminium_002d5">Variable: <strong>tango-aluminium-5</strong></dt>
-</dl>
-
-<dl>
-<dt id="index-tango_002daluminium_002d6">Variable: <strong>tango-aluminium-6</strong></dt>
-</dl>
-
-<hr />
-<div class="header">
-<p>
-Next: <a href="Textures.html" accesskey="n" rel="next">Textures</a>, Up: <a href="Graphics.html" accesskey="u" rel="up">Graphics</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index.html" title="Index" rel="index">Index</a>]</p>
-</div>
-
-
-
-</body>
-</html>
author	David Thompson <dthompson2@worcester.edu>	2023-12-28 11:23:49 -0500
committer	David Thompson <dthompson2@worcester.edu>	2023-12-28 11:23:49 -0500
commit	25c5eac5e6ca1035db1eddd7bea9ac78531da57e (patch)
tree	96377006bbfee75bcf0ce208c1ef89cbdfa5b803 /manuals/chickadee/Colors.html
parent	5b2e467a7e5e2ffbb0cbbf2557283be891d8206b (diff)