darkblueb
/
geos_390_docs
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
geos_390_docs/classgeos_1_1algorithm_1_1I...

145 lines
7.3 KiB
HTML
Raw Permalink Blame History

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=9"/>
<meta name="generator" content="Doxygen 1.8.11"/>
<title>GEOS: geos::algorithm::Intersection Class Reference</title>
<link href="tabs.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="dynsections.js"></script>
<link href="doxygen.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div id="top"><!-- do not remove this div, it is closed by doxygen! -->
<div id="titlearea">
<table cellspacing="0" cellpadding="0">
<tbody>
<tr style="height: 56px;">
<td id="projectalign" style="padding-left: 0.5em;">
<div id="projectname">GEOS
&#160;<span id="projectnumber">3.9.1dev</span>
</div>
</td>
</tr>
</tbody>
</table>
</div>
<!-- end header part -->
<!-- Generated by Doxygen 1.8.11 -->
<div id="navrow1" class="tabs">
<ul class="tablist">
<li><a href="index.html"><span>Main&#160;Page</span></a></li>
<li><a href="pages.html"><span>Related&#160;Pages</span></a></li>
<li><a href="namespaces.html"><span>Namespaces</span></a></li>
<li class="current"><a href="annotated.html"><span>Classes</span></a></li>
<li><a href="files.html"><span>Files</span></a></li>
</ul>
</div>
<div id="navrow2" class="tabs2">
<ul class="tablist">
<li><a href="annotated.html"><span>Class&#160;List</span></a></li>
<li><a href="inherits.html"><span>Class&#160;Hierarchy</span></a></li>
<li><a href="functions.html"><span>Class&#160;Members</span></a></li>
</ul>
</div>
<div id="nav-path" class="navpath">
<ul>
<li class="navelem"><a class="el" href="namespacegeos.html">geos</a></li><li class="navelem"><a class="el" href="namespacegeos_1_1algorithm.html">algorithm</a></li><li class="navelem"><a class="el" href="classgeos_1_1algorithm_1_1Intersection.html">Intersection</a></li> </ul>
</div>
</div><!-- top -->
<div class="header">
<div class="summary">
<a href="#pub-static-methods">Static Public Member Functions</a> &#124;
<a href="classgeos_1_1algorithm_1_1Intersection-members.html">List of all members</a> </div>
<div class="headertitle">
<div class="title">geos::algorithm::Intersection Class Reference</div> </div>
</div><!--header-->
<div class="contents">
<p>Computes the intersection point of two lines. If the lines are parallel or collinear this case is detected and <code>null</code> is returned.
<a href="classgeos_1_1algorithm_1_1Intersection.html#details">More...</a></p>
<p><code>#include &lt;<a class="el" href="Intersection_8h_source.html">Intersection.h</a>&gt;</code></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-static-methods"></a>
Static Public Member Functions</h2></td></tr>
<tr class="memitem:af0dd9c91ae3447dc0cffabb484fd782f"><td class="memItemLeft" align="right" valign="top">static <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1Intersection.html#af0dd9c91ae3447dc0cffabb484fd782f">intersection</a> (const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &amp;p1, const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &amp;p2, const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &amp;q1, const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &amp;q2)</td></tr>
<tr class="separator:af0dd9c91ae3447dc0cffabb484fd782f"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Computes the intersection point of two lines. If the lines are parallel or collinear this case is detected and <code>null</code> is returned. </p>
<p>In general it is not possible to accurately compute the intersection point of two lines, due to numerical roundoff. This is particularly true when the input lines are nearly parallel. This routine uses numerical conditioning on the input values to ensure that the computed value should be very close to the correct value.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">p1</td><td>an endpoint of line 1 </td></tr>
<tr><td class="paramname">p2</td><td>an endpoint of line 1 </td></tr>
<tr><td class="paramname">q1</td><td>an endpoint of line 2 </td></tr>
<tr><td class="paramname">q2</td><td>an endpoint of line 2 </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>the intersection point between the lines, if there is one, or null if the lines are parallel or collinear</dd></dl>
<dl class="section see"><dt>See also</dt><dd>CGAlgorithmsDD::intersection(Coordinate, Coordinate, Coordinate, Coordinate) </dd></dl>
<p>Definition at line <a class="el" href="Intersection_8h_source.html#l00046">46</a> of file <a class="el" href="Intersection_8h_source.html">Intersection.h</a>.</p>
</div><h2 class="groupheader">Member Function Documentation</h2>
<a class="anchor" id="af0dd9c91ae3447dc0cffabb484fd782f"></a>
<div class="memitem">
<div class="memproto">
<table class="mlabels">
<tr>
<td class="mlabels-left">
<table class="memname">
<tr>
<td class="memname">static <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> geos::algorithm::Intersection::intersection </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &amp;&#160;</td>
<td class="paramname"><em>p1</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &amp;&#160;</td>
<td class="paramname"><em>p2</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &amp;&#160;</td>
<td class="paramname"><em>q1</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &amp;&#160;</td>
<td class="paramname"><em>q2</em>&#160;</td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</td>
<td class="mlabels-right">
<span class="mlabels"><span class="mlabel">static</span></span> </td>
</tr>
</table>
</div><div class="memdoc">
</div>
</div>
<hr/>The documentation for this class was generated from the following file:<ul>
<li><a class="el" href="Intersection_8h_source.html">Intersection.h</a></li>
</ul>
</div><!-- contents -->
<!-- start footer part -->
<hr class="footer"/><address class="footer"><small>
Generated by &#160;<a href="http://www.doxygen.org/index.html">
<img class="footer" src="doxygen.png" alt="doxygen"/>
</a> 1.8.11
</small></address>
</body>
</html>
Reference in New Issue View Git Blame Copy Permalink