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<a href="#graphene-Quad.description" class="shortcut">Description</a></span>
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<a name="graphene-Quad"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="graphene-Quad.top_of_page"></a>Quad</span></h2>
<p>Quad — Four-vertex quadrilateral</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="graphene-Quad.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_proto_type">
<col class="functions_proto_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<a class="link" href="graphene-Quad.html#graphene-quad-t" title="graphene_quad_t"><span class="returnvalue">graphene_quad_t</span></a> *
</td>
<td class="function_name">
<a class="link" href="graphene-Quad.html#graphene-quad-alloc" title="graphene_quad_alloc ()">graphene_quad_alloc</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="graphene-Quad.html#graphene-quad-free" title="graphene_quad_free ()">graphene_quad_free</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="graphene-Quad.html#graphene-quad-t" title="graphene_quad_t"><span class="returnvalue">graphene_quad_t</span></a> *
</td>
<td class="function_name">
<a class="link" href="graphene-Quad.html#graphene-quad-init" title="graphene_quad_init ()">graphene_quad_init</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="graphene-Quad.html#graphene-quad-t" title="graphene_quad_t"><span class="returnvalue">graphene_quad_t</span></a> *
</td>
<td class="function_name">
<a class="link" href="graphene-Quad.html#graphene-quad-init-from-rect" title="graphene_quad_init_from_rect ()">graphene_quad_init_from_rect</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="graphene-Quad.html#graphene-quad-t" title="graphene_quad_t"><span class="returnvalue">graphene_quad_t</span></a> *
</td>
<td class="function_name">
<a class="link" href="graphene-Quad.html#graphene-quad-init-from-points" title="graphene_quad_init_from_points ()">graphene_quad_init_from_points</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">bool</span>
</td>
<td class="function_name">
<a class="link" href="graphene-Quad.html#graphene-quad-contains" title="graphene_quad_contains ()">graphene_quad_contains</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="graphene-Quad.html#graphene-quad-bounds" title="graphene_quad_bounds ()">graphene_quad_bounds</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">const <a class="link" href="graphene-Point.html#graphene-point-t" title="graphene_point_t"><span class="returnvalue">graphene_point_t</span></a> *
</td>
<td class="function_name">
<a class="link" href="graphene-Quad.html#graphene-quad-get-point" title="graphene_quad_get_point ()">graphene_quad_get_point</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="graphene-Quad.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="other_proto_type">
<col class="other_proto_name">
</colgroup>
<tbody><tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="graphene-Quad.html#graphene-quad-t" title="graphene_quad_t">graphene_quad_t</a></td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="graphene-Quad.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include <graphene.h>
</pre>
</div>
<div class="refsect1">
<a name="graphene-Quad.description"></a><h2>Description</h2>
<p>A <a class="link" href="graphene-Quad.html#graphene-quad-t" title="graphene_quad_t"><span class="type">graphene_quad_t</span></a> represents a coplanar, four vertex quadrilateral shape.</p>
</div>
<div class="refsect1">
<a name="graphene-Quad.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="graphene-quad-alloc"></a><h3>graphene_quad_alloc ()</h3>
<pre class="programlisting"><a class="link" href="graphene-Quad.html#graphene-quad-t" title="graphene_quad_t"><span class="returnvalue">graphene_quad_t</span></a> *
graphene_quad_alloc (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>Allocates a new <a class="link" href="graphene-Quad.html#graphene-quad-t" title="graphene_quad_t"><span class="type">graphene_quad_t</span></a> instance.</p>
<p>The contents of the returned instance are undefined.</p>
<p><span class="annotation">[<acronym title="This symbol is a constructor, not a static method."><span class="acronym">constructor</span></acronym>]</span></p>
<div class="refsect3">
<a name="graphene-quad-alloc.returns"></a><h4>Returns</h4>
<p>the newly created <a class="link" href="graphene-Quad.html#graphene-quad-t" title="graphene_quad_t"><span class="type">graphene_quad_t</span></a> instance. </p>
<p><span class="annotation">[<acronym title="The caller owns the data, and is responsible for free it."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
<p class="since">Since: <a class="link" href="ix03.html#api-index-1.0">1.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="graphene-quad-free"></a><h3>graphene_quad_free ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
graphene_quad_free (<em class="parameter"><code><a class="link" href="graphene-Quad.html#graphene-quad-t" title="graphene_quad_t"><span class="type">graphene_quad_t</span></a> *q</code></em>);</pre>
<p>Frees the resources allocated by <a class="link" href="graphene-Quad.html#graphene-quad-alloc" title="graphene_quad_alloc ()"><code class="function">graphene_quad_alloc()</code></a></p>
<div class="refsect3">
<a name="graphene-quad-free.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>q</p></td>
<td class="parameter_description"><p>a <a class="link" href="graphene-Quad.html#graphene-quad-t" title="graphene_quad_t"><span class="type">graphene_quad_t</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="ix03.html#api-index-1.0">1.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="graphene-quad-init"></a><h3>graphene_quad_init ()</h3>
<pre class="programlisting"><a class="link" href="graphene-Quad.html#graphene-quad-t" title="graphene_quad_t"><span class="returnvalue">graphene_quad_t</span></a> *
graphene_quad_init (<em class="parameter"><code><a class="link" href="graphene-Quad.html#graphene-quad-t" title="graphene_quad_t"><span class="type">graphene_quad_t</span></a> *q</code></em>,
<em class="parameter"><code>const <a class="link" href="graphene-Point.html#graphene-point-t" title="graphene_point_t"><span class="type">graphene_point_t</span></a> *p1</code></em>,
<em class="parameter"><code>const <a class="link" href="graphene-Point.html#graphene-point-t" title="graphene_point_t"><span class="type">graphene_point_t</span></a> *p2</code></em>,
<em class="parameter"><code>const <a class="link" href="graphene-Point.html#graphene-point-t" title="graphene_point_t"><span class="type">graphene_point_t</span></a> *p3</code></em>,
<em class="parameter"><code>const <a class="link" href="graphene-Point.html#graphene-point-t" title="graphene_point_t"><span class="type">graphene_point_t</span></a> *p4</code></em>);</pre>
<p>Initializes a <a class="link" href="graphene-Quad.html#graphene-quad-t" title="graphene_quad_t"><span class="type">graphene_quad_t</span></a> with the given points.</p>
<div class="refsect3">
<a name="graphene-quad-init.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>q</p></td>
<td class="parameter_description"><p>the <a class="link" href="graphene-Quad.html#graphene-quad-t" title="graphene_quad_t"><span class="type">graphene_quad_t</span></a> to initialize</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>p1</p></td>
<td class="parameter_description"><p>the first point of the quadrilateral</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>p2</p></td>
<td class="parameter_description"><p>the second point of the quadrilateral</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>p3</p></td>
<td class="parameter_description"><p>the third point of the quadrilateral</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>p4</p></td>
<td class="parameter_description"><p>the fourth point of the quadrilateral</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="graphene-quad-init.returns"></a><h4>Returns</h4>
<p>the initialized <a class="link" href="graphene-Quad.html#graphene-quad-t" title="graphene_quad_t"><span class="type">graphene_quad_t</span></a>. </p>
<p><span class="annotation">[<acronym title="The data is owned by the callee, which is responsible of freeing it."><span class="acronym">transfer none</span></acronym>]</span></p>
</div>
<p class="since">Since: <a class="link" href="ix03.html#api-index-1.0">1.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="graphene-quad-init-from-rect"></a><h3>graphene_quad_init_from_rect ()</h3>
<pre class="programlisting"><a class="link" href="graphene-Quad.html#graphene-quad-t" title="graphene_quad_t"><span class="returnvalue">graphene_quad_t</span></a> *
graphene_quad_init_from_rect (<em class="parameter"><code><a class="link" href="graphene-Quad.html#graphene-quad-t" title="graphene_quad_t"><span class="type">graphene_quad_t</span></a> *q</code></em>,
<em class="parameter"><code>const <a class="link" href="graphene-Rectangle.html#graphene-rect-t" title="graphene_rect_t"><span class="type">graphene_rect_t</span></a> *r</code></em>);</pre>
<p>Initializes a <a class="link" href="graphene-Quad.html#graphene-quad-t" title="graphene_quad_t"><span class="type">graphene_quad_t</span></a> using the four corners of the
given <a class="link" href="graphene-Rectangle.html#graphene-rect-t" title="graphene_rect_t"><span class="type">graphene_rect_t</span></a>.</p>
<div class="refsect3">
<a name="graphene-quad-init-from-rect.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>q</p></td>
<td class="parameter_description"><p>the <a class="link" href="graphene-Quad.html#graphene-quad-t" title="graphene_quad_t"><span class="type">graphene_quad_t</span></a> to initialize</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>r</p></td>
<td class="parameter_description"><p>a <a class="link" href="graphene-Rectangle.html#graphene-rect-t" title="graphene_rect_t"><span class="type">graphene_rect_t</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="graphene-quad-init-from-rect.returns"></a><h4>Returns</h4>
<p>the initialized <a class="link" href="graphene-Quad.html#graphene-quad-t" title="graphene_quad_t"><span class="type">graphene_quad_t</span></a>. </p>
<p><span class="annotation">[<acronym title="The data is owned by the callee, which is responsible of freeing it."><span class="acronym">transfer none</span></acronym>]</span></p>
</div>
<p class="since">Since: <a class="link" href="ix03.html#api-index-1.0">1.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="graphene-quad-init-from-points"></a><h3>graphene_quad_init_from_points ()</h3>
<pre class="programlisting"><a class="link" href="graphene-Quad.html#graphene-quad-t" title="graphene_quad_t"><span class="returnvalue">graphene_quad_t</span></a> *
graphene_quad_init_from_points (<em class="parameter"><code><a class="link" href="graphene-Quad.html#graphene-quad-t" title="graphene_quad_t"><span class="type">graphene_quad_t</span></a> *q</code></em>,
<em class="parameter"><code>const <a class="link" href="graphene-Point.html#graphene-point-t" title="graphene_point_t"><span class="type">graphene_point_t</span></a> points[]</code></em>);</pre>
<p>Initializes a <a class="link" href="graphene-Quad.html#graphene-quad-t" title="graphene_quad_t"><span class="type">graphene_quad_t</span></a> using an array of points.</p>
<div class="refsect3">
<a name="graphene-quad-init-from-points.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>q</p></td>
<td class="parameter_description"><p>the <a class="link" href="graphene-Quad.html#graphene-quad-t" title="graphene_quad_t"><span class="type">graphene_quad_t</span></a> to initialize</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>points</p></td>
<td class="parameter_description"><p>an array of 4 <a class="link" href="graphene-Point.html#graphene-point-t" title="graphene_point_t"><span class="type">graphene_point_t</span></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> fixed-size=4]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="graphene-quad-init-from-points.returns"></a><h4>Returns</h4>
<p>the initialized <a class="link" href="graphene-Quad.html#graphene-quad-t" title="graphene_quad_t"><span class="type">graphene_quad_t</span></a>. </p>
<p><span class="annotation">[<acronym title="The data is owned by the callee, which is responsible of freeing it."><span class="acronym">transfer none</span></acronym>]</span></p>
</div>
<p class="since">Since: <a class="link" href="ix04.html#api-index-1.2">1.2</a></p>
</div>
<hr>
<div class="refsect2">
<a name="graphene-quad-contains"></a><h3>graphene_quad_contains ()</h3>
<pre class="programlisting"><span class="returnvalue">bool</span>
graphene_quad_contains (<em class="parameter"><code>const <a class="link" href="graphene-Quad.html#graphene-quad-t" title="graphene_quad_t"><span class="type">graphene_quad_t</span></a> *q</code></em>,
<em class="parameter"><code>const <a class="link" href="graphene-Point.html#graphene-point-t" title="graphene_point_t"><span class="type">graphene_point_t</span></a> *p</code></em>);</pre>
<p>Checks if the given <a class="link" href="graphene-Quad.html#graphene-quad-t" title="graphene_quad_t"><span class="type">graphene_quad_t</span></a> contains the given <a class="link" href="graphene-Point.html#graphene-point-t" title="graphene_point_t"><span class="type">graphene_point_t</span></a>.</p>
<div class="refsect3">
<a name="graphene-quad-contains.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>q</p></td>
<td class="parameter_description"><p>a <a class="link" href="graphene-Quad.html#graphene-quad-t" title="graphene_quad_t"><span class="type">graphene_quad_t</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>p</p></td>
<td class="parameter_description"><p>a <a class="link" href="graphene-Point.html#graphene-point-t" title="graphene_point_t"><span class="type">graphene_point_t</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="graphene-quad-contains.returns"></a><h4>Returns</h4>
<p> <code class="literal">true</code> if the point is inside the <a class="link" href="graphene-Quad.html#graphene-quad-t" title="graphene_quad_t"><span class="type">graphene_quad_t</span></a></p>
</div>
<p class="since">Since: <a class="link" href="ix03.html#api-index-1.0">1.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="graphene-quad-bounds"></a><h3>graphene_quad_bounds ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
graphene_quad_bounds (<em class="parameter"><code>const <a class="link" href="graphene-Quad.html#graphene-quad-t" title="graphene_quad_t"><span class="type">graphene_quad_t</span></a> *q</code></em>,
<em class="parameter"><code><a class="link" href="graphene-Rectangle.html#graphene-rect-t" title="graphene_rect_t"><span class="type">graphene_rect_t</span></a> *r</code></em>);</pre>
<p>Computes the bounding rectangle of <em class="parameter"><code>q</code></em>
and places it into <em class="parameter"><code>r</code></em>
.</p>
<div class="refsect3">
<a name="graphene-quad-bounds.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>q</p></td>
<td class="parameter_description"><p>a <a class="link" href="graphene-Quad.html#graphene-quad-t" title="graphene_quad_t"><span class="type">graphene_quad_t</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>r</p></td>
<td class="parameter_description"><p>return location for a <a class="link" href="graphene-Rectangle.html#graphene-rect-t" title="graphene_rect_t"><span class="type">graphene_rect_t</span></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Out parameter, where caller must allocate storage."><span class="acronym">out caller-allocates</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="ix03.html#api-index-1.0">1.0</a></p>
</div>
<hr>
<div class="refsect2">
<a name="graphene-quad-get-point"></a><h3>graphene_quad_get_point ()</h3>
<pre class="programlisting">const <a class="link" href="graphene-Point.html#graphene-point-t" title="graphene_point_t"><span class="returnvalue">graphene_point_t</span></a> *
graphene_quad_get_point (<em class="parameter"><code>const <a class="link" href="graphene-Quad.html#graphene-quad-t" title="graphene_quad_t"><span class="type">graphene_quad_t</span></a> *q</code></em>,
<em class="parameter"><code>unsigned <span class="type">int</span> index_</code></em>);</pre>
<p>Retrieves the point of a <a class="link" href="graphene-Quad.html#graphene-quad-t" title="graphene_quad_t"><span class="type">graphene_quad_t</span></a> at the given index.</p>
<div class="refsect3">
<a name="graphene-quad-get-point.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>q</p></td>
<td class="parameter_description"><p>a <a class="link" href="graphene-Quad.html#graphene-quad-t" title="graphene_quad_t"><span class="type">graphene_quad_t</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>index_</p></td>
<td class="parameter_description"><p>the index of the point to retrieve</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="graphene-quad-get-point.returns"></a><h4>Returns</h4>
<p>a <a class="link" href="graphene-Point.html#graphene-point-t" title="graphene_point_t"><span class="type">graphene_point_t</span></a>. </p>
<p><span class="annotation">[<acronym title="The data is owned by the callee, which is responsible of freeing it."><span class="acronym">transfer none</span></acronym>]</span></p>
</div>
<p class="since">Since: <a class="link" href="ix03.html#api-index-1.0">1.0</a></p>
</div>
</div>
<div class="refsect1">
<a name="graphene-Quad.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="graphene-quad-t"></a><h3>graphene_quad_t</h3>
<pre class="programlisting">typedef struct {
} graphene_quad_t;
</pre>
<p>A 4 vertex quadrilateral, as represented by four <a class="link" href="graphene-Point.html#graphene-point-t" title="graphene_point_t"><span class="type">graphene_point_t</span></a>.</p>
<p>The contents of a <a class="link" href="graphene-Quad.html#graphene-quad-t" title="graphene_quad_t"><span class="type">graphene_quad_t</span></a> are private and should never be
accessed directly.</p>
<p class="since">Since: <a class="link" href="ix03.html#api-index-1.0">1.0</a></p>
</div>
</div>
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