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<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_1RobustDeterminant.html">RobustDeterminant</a></li> </ul>
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<a href="#pub-static-methods">Static Public Member Functions</a> |
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<div class="title">geos::algorithm::RobustDeterminant Class Reference</div> </div>
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<p>Implements an algorithm to compute the sign of a 2x2 determinant for double precision values robustly.
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<a href="classgeos_1_1algorithm_1_1RobustDeterminant.html#details">More...</a></p>
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<p><code>#include <<a class="el" href="RobustDeterminant_8h_source.html">RobustDeterminant.h</a>></code></p>
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<table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-static-methods"></a>
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Static Public Member Functions</h2></td></tr>
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<tr class="memitem:aa4281973e2c4ae3940eeb1ad3aaa0dd2"><td class="memItemLeft" align="right" valign="top">static int </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1algorithm_1_1RobustDeterminant.html#aa4281973e2c4ae3940eeb1ad3aaa0dd2">signOfDet2x2</a> (double x1, double y1, double x2, double y2)</td></tr>
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<tr class="memdesc:aa4281973e2c4ae3940eeb1ad3aaa0dd2"><td class="mdescLeft"> </td><td class="mdescRight">Computes the sign of the determinant of the 2x2 matrix with the given entries, in a robust way. <a href="#aa4281973e2c4ae3940eeb1ad3aaa0dd2">More...</a><br /></td></tr>
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<tr class="separator:aa4281973e2c4ae3940eeb1ad3aaa0dd2"><td class="memSeparator" colspan="2"> </td></tr>
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</table>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
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<div class="textblock"><p>Implements an algorithm to compute the sign of a 2x2 determinant for double precision values robustly. </p>
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<p>It is a direct translation of code developed by Olivier Devillers.</p>
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<p>The original code carries the following copyright notice:</p>
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<pre></pre><pre>The original code carries the following copyright notice:
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Author : Olivier Devillers
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<a href="#" onclick="location.href='mai'+'lto:'+'Oli'+'vi'+'er.'+'De'+'vil'+'le'+'rs@'+'so'+'phi'+'a.'+'inr'+'ia'+'.fr'; return false;">Olivi<span style="display: none;">.nosp@m.</span>er.D<span style="display: none;">.nosp@m.</span>evill<span style="display: none;">.nosp@m.</span>ers@<span style="display: none;">.nosp@m.</span>sophi<span style="display: none;">.nosp@m.</span>a.in<span style="display: none;">.nosp@m.</span>ria.f<span style="display: none;">.nosp@m.</span>r</a>
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<a href="http:/www.inria.fr:/prisme/personnel/devillers/anglais/determinant.html">http:/www.inria.fr:/prisme/personnel/devillers/anglais/determinant.html</a></pre><pre><pre class="fragment"> Copyright (c) 1995 by INRIA Prisme Project
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BP 93 06902 Sophia Antipolis Cedex, France.
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All rights reserved
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</pre></pre><pre></pre>
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<p>Definition at line <a class="el" href="RobustDeterminant_8h_source.html#l00051">51</a> of file <a class="el" href="RobustDeterminant_8h_source.html">RobustDeterminant.h</a>.</p>
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</div><h2 class="groupheader">Member Function Documentation</h2>
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<a class="anchor" id="aa4281973e2c4ae3940eeb1ad3aaa0dd2"></a>
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<td class="memname">static int geos::algorithm::RobustDeterminant::signOfDet2x2 </td>
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<td>(</td>
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<td class="paramtype">double </td>
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<td class="paramname"><em>x1</em>, </td>
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<td class="paramtype">double </td>
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<td class="paramname"><em>y1</em>, </td>
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<td class="paramkey"></td>
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<td class="paramname"><em>x2</em>, </td>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">double </td>
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<td class="paramname"><em>y2</em> </td>
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<td></td>
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<td>)</td>
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<span class="mlabels"><span class="mlabel">static</span></span> </td>
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<p>Computes the sign of the determinant of the 2x2 matrix with the given entries, in a robust way. </p>
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<dl class="section return"><dt>Returns</dt><dd>-1 if the determinant is negative, </dd>
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<dd>
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1 if the determinant is positive, </dd>
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<dd>
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0 if the determinant is 0. </dd></dl>
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</div>
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</div>
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<hr/>The documentation for this class was generated from the following file:<ul>
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<li><a class="el" href="RobustDeterminant_8h_source.html">RobustDeterminant.h</a></li>
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