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<h1>csChainHull2D Class Reference<br>
<small>
[<a class="el" href="group__geom__utils.html">Geometry utilities</a>]</small>
</h1><!-- doxytag: class="csChainHull2D" -->This is Andrew's monotone chain 2D convex hull algorithm.
<a href="#_details">More...</a>
<p>
<code>#include <<a class="el" href="chainhull2d_8h-source.html">csgeom/chainhull2d.h</a>></code>
<p>
<p>
<a href="classcsChainHull2D-members.html">List of all members.</a><table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Static Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">static size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="classcsChainHull2D.html#251664ca895909773a862bbe64b2a5ed">CalculatePresorted</a> (<a class="el" href="classcsVector2.html">csVector2</a> *points, size_t n, <a class="el" href="classcsVector2.html">csVector2</a> *hull)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">This routine will calculate the convex hull of the presorted input points (presorted by increasing x and y coordinates). <a href="#251664ca895909773a862bbe64b2a5ed"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">static void </td><td class="memItemRight" valign="bottom"><a class="el" href="classcsChainHull2D.html#b079e6090d340f9e9cf4eb6fddacec9a">SortXY</a> (<a class="el" href="classcsVector2.html">csVector2</a> *points, size_t n)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Sort the given array by increasing x and y coordinates so that it can be used by <a class="el" href="classcsChainHull2D.html#251664ca895909773a862bbe64b2a5ed" title="This routine will calculate the convex hull of the presorted input points (presorted...">CalculatePresorted()</a>. <a href="#b079e6090d340f9e9cf4eb6fddacec9a"></a><br></td></tr>
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<hr><a name="_details"></a><h2>Detailed Description</h2>
This is Andrew's monotone chain 2D convex hull algorithm.
<p>Definition at line <a class="el" href="chainhull2d_8h-source.html#l00046">46</a> of file <a class="el" href="chainhull2d_8h-source.html">chainhull2d.h</a>.</p>
<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="251664ca895909773a862bbe64b2a5ed"></a><!-- doxytag: member="csChainHull2D::CalculatePresorted" ref="251664ca895909773a862bbe64b2a5ed" args="(csVector2 *points, size_t n, csVector2 *hull)" -->
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<td class="memname">static size_t csChainHull2D::CalculatePresorted </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classcsVector2.html">csVector2</a> * </td>
<td class="paramname"> <em>points</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t </td>
<td class="paramname"> <em>n</em>, </td>
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<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classcsVector2.html">csVector2</a> * </td>
<td class="paramname"> <em>hull</em></td><td> </td>
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<td></td>
<td>)</td>
<td></td><td></td><td width="100%"><code> [static]</code></td>
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<p>
This routine will calculate the convex hull of the presorted input points (presorted by increasing x and y coordinates).
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>points</em> </td><td>is the presorted set of points. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>n</em> </td><td>is the number of points </td></tr>
<tr><td valign="top"></td><td valign="top"><em>hull</em> </td><td>is the convex hull output. This array must be at least as big as the 'points' array (i.e. n points) </td></tr>
</table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>the number of points in the convex hull </dd></dl>
</div>
</div><p>
<a class="anchor" name="b079e6090d340f9e9cf4eb6fddacec9a"></a><!-- doxytag: member="csChainHull2D::SortXY" ref="b079e6090d340f9e9cf4eb6fddacec9a" args="(csVector2 *points, size_t n)" -->
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<td class="memname">static void csChainHull2D::SortXY </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classcsVector2.html">csVector2</a> * </td>
<td class="paramname"> <em>points</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t </td>
<td class="paramname"> <em>n</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td width="100%"><code> [static]</code></td>
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<p>
Sort the given array by increasing x and y coordinates so that it can be used by <a class="el" href="classcsChainHull2D.html#251664ca895909773a862bbe64b2a5ed" title="This routine will calculate the convex hull of the presorted input points (presorted...">CalculatePresorted()</a>.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>points</em> </td><td>is the set of points </td></tr>
<tr><td valign="top"></td><td valign="top"><em>n</em> </td><td>is the number of points </td></tr>
</table>
</dl>
</div>
</div><p>
<hr>The documentation for this class was generated from the following file:<ul>
<li>csgeom/<a class="el" href="chainhull2d_8h-source.html">chainhull2d.h</a></ul>
<hr size="1"><address><small>Generated for Crystal Space 1.2.1 by
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