From f16fed3d50fd3d56deb46a3d4641a81460e389de Mon Sep 17 00:00:00 2001
From: David Thompson <dthompson2@worcester.edu>
Date: Wed, 12 Dec 2018 09:20:10 -0500
Subject: Update Chickadee manual and home page for 0.3.0.

Better late than never!
---
 manuals/chickadee/Rectangles.html | 253 ++++++++++++++++++++++++++++++++++++--
 1 file changed, 244 insertions(+), 9 deletions(-)

(limited to 'manuals/chickadee/Rectangles.html')
diff --git a/manuals/chickadee/Rectangles.html b/manuals/chickadee/Rectangles.html
index 6d0c9e8..edaf4e6 100644
--- a/manuals/chickadee/Rectangles.html
+++ b/manuals/chickadee/Rectangles.html
@@ -16,22 +16,22 @@ Foundation Web site at http://www.gnu.org/licenses/fdl.html.
 The document was typeset with
 http://www.texinfo.org/ (GNU Texinfo).
  -->
-<!-- Created by GNU Texinfo 6.3, http://www.gnu.org/software/texinfo/ -->
+<!-- Created by GNU Texinfo 6.5, http://www.gnu.org/software/texinfo/ -->
 <head>
-<title>The Chickadee Game Toolkit: Rectangles</title>
+<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Rectangles (The Chickadee Game Toolkit)</title>
 
-<meta name="description" content="The Chickadee Game Toolkit: Rectangles">
-<meta name="keywords" content="The Chickadee Game Toolkit: Rectangles">
+<meta name="description" content="Rectangles (The Chickadee Game Toolkit)">
+<meta name="keywords" content="Rectangles (The Chickadee Game Toolkit)">
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 <meta name="distribution" content="global">
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 <link href="Index.html#Index" rel="index" title="Index">
 <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
 <link href="Math.html#Math" rel="up" title="Math">
-<link href="Graphics.html#Graphics" rel="next" title="Graphics">
-<link href="Matrices.html#Matrices" rel="prev" title="Matrices">
+<link href="Grid.html#Grid" rel="next" title="Grid">
+<link href="Vectors.html#Vectors" rel="prev" title="Vectors">
 <style type="text/css">
 <!--
 a.summary-letter {text-decoration: none}
@@ -90,12 +90,247 @@ ul.no-bullet {list-style: none}
 <a name="Rectangles"></a>
 <div class="header">
 <p>
-Previous: <a href="Matrices.html#Matrices" accesskey="p" rel="prev">Matrices</a>, Up: <a href="Math.html#Math" accesskey="u" rel="up">Math</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index.html#Index" title="Index" rel="index">Index</a>]</p>
+Next: <a href="Grid.html#Grid" accesskey="n" rel="next">Grid</a>, Previous: <a href="Vectors.html#Vectors" accesskey="p" rel="prev">Vectors</a>, Up: <a href="Math.html#Math" accesskey="u" rel="up">Math</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index.html#Index" title="Index" rel="index">Index</a>]</p>
 </div>
 <hr>
 <a name="Rectangles-1"></a>
-<h4 class="subsection">2.3.3 Rectangles</h4>
+<h4 class="subsection">2.2.3 Rectangles</h4>
+
+<p>The <code>(chickadee math rect)</code> module provides an API for
+manipulating axis-aligned bounding boxes (AABBs).  AABBs are often
+used for collision detection in games.  Common use-cases are defining
+&ldquo;hitboxes&rdquo; in platformers or using them for the &ldquo;broad phase&rdquo; of a
+collision detection algorithm that uses a more complex (and thus
+slower) method of determining the actual collisions.
+</p>
+<p>Like some of the other math modules, there exists a collection of
+functions that do in-place modification of rectangles for use in
+performance critical code paths.
+</p>
+<dl>
+<dt><a name="index-make_002drect"></a>Procedure: <strong>make-rect</strong> <em><var>x</var> <var>y</var> <var>width</var> <var>height</var></em></dt>
+<dd><p>Create a new rectangle that is <var>width</var> by <var>height</var> in size and
+whose bottom-left corner is located at (<var>x</var>, <var>y</var>).
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-rect_003f"></a>Procedure: <strong>rect?</strong> <em><var>obj</var></em></dt>
+<dd><p>Return <code>#t</code> if <var>obj</var> is a rectangle.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-rect_002dwithin_003f"></a>Procedure: <strong>rect-within?</strong> <em><var>rect1</var> <var>rect2</var></em></dt>
+<dd><p>Return <code>#t</code> if <var>rect2</var> is completely within <var>rect1</var>.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-rect_002dintersects_003f"></a>Procedure: <strong>rect-intersects?</strong> <em><var>rect1</var> <var>rect2</var></em></dt>
+<dd><p>Return <code>#t</code> if <var>rect2</var> overlaps <var>rect1</var>.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-rect_002dcontains_003f"></a>Procedure: <strong>rect-contains?</strong> <em><var>rect</var> <var>x</var> <var>y</var></em></dt>
+<dd><p>Return <code>#t</code> if the coordinates (<var>x</var>, <var>y</var>) are within
+<var>rect</var>.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-rect_002dcontains_002dvec2_003f"></a>Procedure: <strong>rect-contains-vec2?</strong> <em><var>rect</var> <var>v</var></em></dt>
+<dd><p>Return <code>#t</code> if the 2D vector <var>v</var> is within the bounds of
+<var>rect</var>.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-rect_002dx"></a>Procedure: <strong>rect-x</strong> <em><var>rect</var></em></dt>
+<dd><p>Return the X coordinate of the lower-left corner of <var>rect</var>.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-rect_002dy"></a>Procedure: <strong>rect-y</strong> <em><var>rect</var></em></dt>
+<dd><p>Return the Y coordinate of the lower-left corner of <var>rect</var>.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-rect_002dleft"></a>Procedure: <strong>rect-left</strong> <em><var>rect</var></em></dt>
+<dd><p>Return the left-most X coordinate of <var>rect</var>.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-rect_002dright"></a>Procedure: <strong>rect-right</strong> <em><var>rect</var></em></dt>
+<dd><p>Return the right-most X coordinate of <var>rect</var>.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-rect_002dbottom"></a>Procedure: <strong>rect-bottom</strong> <em><var>rect</var></em></dt>
+<dd><p>Return the bottom-most Y coordinate of <var>rect</var>.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-rect_002dtop"></a>Procedure: <strong>rect-top</strong> <em><var>rect</var></em></dt>
+<dd><p>Return the top-most Y coordinate of <var>rect</var>.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-rect_002dcenter_002dx"></a>Procedure: <strong>rect-center-x</strong> <em><var>rect</var></em></dt>
+<dd><p>Return the X coordinate of the center of <var>rect</var>.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-rect_002dcenter_002dy"></a>Procedure: <strong>rect-center-y</strong> <em><var>rect</var></em></dt>
+<dd><p>Return the Y coordinate of the center of <var>rect</var>.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-rect_002dwidth"></a>Procedure: <strong>rect-width</strong> <em><var>rect</var></em></dt>
+<dd><p>Return the width of <var>rect</var>.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-rect_002dheight"></a>Procedure: <strong>rect-height</strong> <em><var>rect</var></em></dt>
+<dd><p>Return the height of <var>rect</var>.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-rect_002darea"></a>Procedure: <strong>rect-area</strong> <em><var>rect</var></em></dt>
+<dd><p>Return the surface area covered by <var>rect</var>.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-rect_002dclamp_002dx"></a>Procedure: <strong>rect-clamp-x</strong> <em><var>rect</var> <var>x</var></em></dt>
+<dd><p>Restrict <var>x</var> to the portion of the X axis covered by <var>rect</var>.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-rect_002dclamp_002dy"></a>Procedure: <strong>rect-clamp-y</strong> <em><var>rect</var> <var>y</var></em></dt>
+<dd><p>Restrict <var>y</var> to the portion of the Y axis covered by <var>rect</var>.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-rect_002dclamp"></a>Procedure: <strong>rect-clamp</strong> <em><var>rect1</var> <var>rect2</var></em></dt>
+<dd><p>Return a new rect that adjusts the location of <var>rect1</var> so that it
+is completely within <var>rect2</var>.  An exception is thrown in the case
+that <var>rect1</var> cannot fit completely within <var>rect2</var>.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-rect_002dmove"></a>Procedure: <strong>rect-move</strong> <em><var>rect</var> <var>x</var> <var>y</var></em></dt>
+<dd><p>Return a new rectangle based on <var>rect</var> but moved to the
+coordinates (<var>x</var>, <var>y</var>).
+</p></dd></dl>
 
+<dl>
+<dt><a name="index-rect_002dmove_002dvec2"></a>Procedure: <strong>rect-move-vec2</strong> <em><var>rect</var> <var>v</var></em></dt>
+<dd><p>Return a new rectangle based on <var>rect</var> but moved to the
+coordinates in the 2D vector <var>v</var>.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-rect_002dmove_002dby"></a>Procedure: <strong>rect-move-by</strong> <em><var>rect</var> <var>x</var> <var>y</var></em></dt>
+<dd><p>Return a new rectangle based on <var>rect</var> but moved by (<var>x</var>,
+<var>y</var>) units relative to its current location.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-rect_002dmove_002dby_002dvec2"></a>Procedure: <strong>rect-move-by-vec2</strong> <em><var>rect</var> <var>v</var></em></dt>
+<dd><p>Return a new rectangle based on <var>rect</var> but moved by the 2D vector
+<var>v</var> relative to its current location.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-rect_002dinflate"></a>Procedure: <strong>rect-inflate</strong> <em><var>rect</var> <var>width</var> <var>height</var></em></dt>
+<dd><p>Return a new rectangle based on <var>rect</var>, but expanded by
+<var>width</var> units on the X axis and <var>height</var> units on the Y axis,
+while keeping the rectangle centered on the same point.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-rect_002dunion"></a>Procedure: <strong>rect-union</strong> <em><var>rect1</var> <var>rect2</var></em></dt>
+<dd><p>Return a new rectangle that completely covers the area of <var>rect1</var>
+and <var>rect2</var>.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-rect_002dclip"></a>Procedure: <strong>rect-clip</strong> <em><var>rect1</var> <var>rect2</var></em></dt>
+<dd><p>Return a new rectangle that is the overlapping region of <var>rect1</var>
+and <var>rect2</var>.  If the two rectangles do not overlap, a rectangle of
+0 width and 0 height is returned.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-set_002drect_002dx_0021"></a>Procedure: <strong>set-rect-x!</strong> <em><var>rect</var> <var>x</var></em></dt>
+<dd><p>Set the left X coordinate of <var>rect</var> to <var>x</var>.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-set_002drect_002dy_0021"></a>Procedure: <strong>set-rect-y!</strong> <em><var>rect</var> <var>y</var></em></dt>
+<dd><p>Set the bottom Y coordinate of <var>rect</var> to <var>y</var>.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-set_002drect_002dwidth_0021"></a>Procedure: <strong>set-rect-width!</strong> <em><var>rect</var> <var>width</var></em></dt>
+<dd><p>Set the width of <var>rect</var> to <var>width</var>.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-set_002drect_002dheight_0021"></a>Procedure: <strong>set-rect-height!</strong> <em><var>rect</var> <var>height</var></em></dt>
+<dd><p>Set the height of <var>rect</var> to <var>height</var>.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-rect_002dmove_0021"></a>Procedure: <strong>rect-move!</strong> <em><var>rect</var> <var>x</var> <var>y</var></em></dt>
+<dd><p>Move <var>rect</var> to (<var>x</var>, <var>y</var>) in-place.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-rect_002dmove_002dvec2_0021"></a>Procedure: <strong>rect-move-vec2!</strong> <em><var>rect</var> <var>v</var></em></dt>
+<dd><p>Move <var>rect</var> to the 2D vector <var>v</var> in-place.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-rect_002dmove_002dby_0021"></a>Procedure: <strong>rect-move-by!</strong> <em><var>rect</var> <var>x</var> <var>y</var></em></dt>
+<dd><p>Move <var>rect</var> by (<var>x</var>, <var>y</var>) in-place.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-rect_002dmove_002dby_002dvec2_0021"></a>Procedure: <strong>rect-move-by-vec2!</strong> <em><var>rect</var> <var>v</var></em></dt>
+<dd><p>Move <var>rect</var> by the 2D vector <var>v</var> in-place.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-rect_002dinflate_0021"></a>Procedure: <strong>rect-inflate!</strong> <em><var>rect</var> <var>width</var> <var>height</var></em></dt>
+<dd><p>Expand <var>rect</var> by <var>width</var> and <var>height</var> in-place.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-rect_002dunion_0021"></a>Procedure: <strong>rect-union!</strong> <em><var>rect1</var> <var>rect2</var></em></dt>
+<dd><p>Modify <var>rect1</var> in-place to completely cover the area of both
+<var>rect1</var> and <var>rect2</var>.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-rect_002dclip_0021"></a>Procedure: <strong>rect-clip!</strong> <em><var>rect1</var> <var>rect2</var></em></dt>
+<dd><p>Modify <var>rect1</var> in-place to be the overlapping region of
+<var>rect1</var> and <var>rect2</var>.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-rect_002dclamp_0021"></a>Procedure: <strong>rect-clamp!</strong> <em><var>rect1</var> <var>rect2</var></em></dt>
+<dd><p>Adjust the location of <var>rect1</var> in-place so that its bounds are
+completely within <var>rect2</var>.  An exception is thrown in the case
+that <var>rect1</var> cannot fit completely within <var>rect2</var>.
+</p></dd></dl>
+
+<dl>
+<dt><a name="index-vec2_002dclamp_002dto_002drect_0021"></a>Procedure: <strong>vec2-clamp-to-rect!</strong> <em><var>v</var> <var>rect</var></em></dt>
+<dd><p>Restrict the coordinates of the 2D vector <var>v</var> so that they are
+within the bounds of <var>rect</var>.  <var>v</var> is modified in-place.
+</p></dd></dl>
+
+<hr>
+<div class="header">
+<p>
+Next: <a href="Grid.html#Grid" accesskey="n" rel="next">Grid</a>, Previous: <a href="Vectors.html#Vectors" accesskey="p" rel="prev">Vectors</a>, Up: <a href="Math.html#Math" accesskey="u" rel="up">Math</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index.html#Index" title="Index" rel="index">Index</a>]</p>
+</div>
 
 
 
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