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<title>Boost Polygon Library: Connectivity Extraction 45</title>
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<div style="padding: 5px;" align="center"> <img
src="images/boost.png" border="0" height="86" width="277" /><a
title="www.boost.org home page" href="http://www.boost.org/"
tabindex="2" style="border: medium none ;"> </a> </div>
<div style="margin: 5px;">
<h3 class="navbar">Contents</h3>
<ul>
<li><a href="index.htm">Boost.Polygon Main Page</a></li>
<li><a href="gtl_design_overview.htm">Design Overview</a></li>
<li><a href="gtl_isotropy.htm">Isotropy</a></li>
<li><a href="gtl_coordinate_concept.htm">Coordinate Concept</a></li>
<li><a href="gtl_interval_concept.htm">Interval Concept</a></li>
<li><a href="gtl_point_concept.htm">Point Concept</a></li>
<li><a href="gtl_segment_concept.htm">Segment Concept</a></li>
<li><a href="gtl_rectangle_concept.htm">Rectangle Concept</a></li>
<li><a href="gtl_polygon_90_concept.htm">Polygon 90 Concept</a></li>
<li><a href="gtl_polygon_90_with_holes_concept.htm">Polygon 90
With Holes Concept</a></li>
<li><a href="gtl_polygon_45_concept.htm">Polygon 45 Concept</a></li>
<li><a href="gtl_polygon_45_with_holes_concept.htm">Polygon 45
With Holes Concept</a></li>
<li><a href="gtl_polygon_concept.htm">Polygon Concept</a></li>
<li><a href="gtl_polygon_with_holes_concept.htm">Polygon With
Holes Concept</a></li>
<li><a href="gtl_polygon_90_set_concept.htm">Polygon 90 Set
Concept</a></li>
<li><a href="gtl_polygon_45_set_concept.htm">Polygon 45 Set
Concept</a></li>
<li><a href="gtl_polygon_set_concept.htm">Polygon Set Concept</a></li>
<li><a href="gtl_connectivity_extraction_90.htm">Connectivity
Extraction 90</a></li>
<li><a href="gtl_connectivity_extraction_45.htm">Connectivity
Extraction 45</a></li>
<li>Connectivity Extraction</li>
<li><a href="gtl_property_merge_90.htm">Property Merge 90</a></li>
<li><a href="gtl_property_merge_45.htm">Property Merge 45</a></li>
<li><a href="gtl_property_merge.htm">Property Merge</a></li>
<li><a href="voronoi_main.htm">Voronoi Main Page<br />
</a></li>
<li><a href="voronoi_benchmark.htm">Voronoi Benchmark</a><br />
</li>
<li><a href="voronoi_builder.htm">Voronoi Builder</a></li>
<li><a href="voronoi_diagram.htm">Voronoi Diagram</a></li>
</ul>
<h3 class="navbar">Other Resources</h3>
<ul>
<li><a href="GTL_boostcon2009.pdf">GTL Boostcon 2009 Paper</a></li>
<li><a href="GTL_boostcon_draft03.pdf">GTL Boostcon 2009
Presentation</a></li>
<li><a href="analysis.htm">Performance Analysis</a></li>
<li><a href="gtl_tutorial.htm">Layout Versus Schematic Tutorial</a></li>
<li><a href="gtl_minkowski_tutorial.htm">Minkowski Sum Tutorial</a></li>
<li><a href="voronoi_basic_tutorial.htm">Voronoi Basic Tutorial</a></li>
<li><a href="voronoi_advanced_tutorial.htm">Voronoi Advanced
Tutorial</a></li>
</ul>
</div>
<h3 class="navbar">Polygon Sponsor</h3>
<div style="padding: 5px;" align="center"> <img
src="images/intlogo.gif" border="0" height="51" width="127" /><a
title="www.adobe.com home page" href="http://www.adobe.com/"
tabindex="2" style="border: medium none ;"> </a> </div>
</td>
<td
style="padding-left: 10px; padding-right: 10px; padding-bottom: 10px;"
valign="top" width="100%">
<!-- End Header --><br />
<p>
</p>
<h1>Connectivity Extraction</h1>
<p> </p>
<p>The connectivity extraction algorithm constructs the
connectivity graph where input polygon sets are modeled as graph nodes
and assigned node ids and overlap/touching between input polygon sets
is modeled as graph edges.&nbsp; One supported graph formats is
std::vector&lt;std::set&lt;int&gt; &gt; where node ids index into the
vector and the sets of integers at each index are the ids of nodes for
which an edge exists in the graph.&nbsp; It is required that such
vector pre-allocate sufficient elements to store the graph generated by
the algorithm, because only the operator[] is used internally to access
the graph&nbsp;&nbsp; The other supported graph format is
std::map&lt;int, std::set&lt;int&gt; &gt; which is slightly easier to
work with, but potentially more expensive.&nbsp; Improving the
interface to support more generic graph concepts is deferred to future
work.</p>
<p>The following is the declaration of the connectivity
extraction algorithm.</p>
<p><font face="Courier New">template &lt;typename
coordinate_type&gt;<br />
class connectivity_extraction;</font></p>
<p>Example code <a href="gtl_connectivity_extraction_usage.htm">connectivity_extraction_usage.cpp</a>
demonstrates using the connectivity extraction algorithm to build a
connectivity graph on geometry.</p>
<h2>Member Functions</h2>
<table id="table1" border="1" width="100%">
<tbody>
<tr>
<td width="586"><b><font face="Courier New">connectivity_extraction</font></b><font
face="Courier New">()</font></td>
<td>Default constructor. </td>
</tr>
<tr>
<td width="586"><b><font face="Courier New">connectivity_extraction</font></b><font
face="Courier New">(<br />
&nbsp;&nbsp;&nbsp;&nbsp; const connectivity_extraction&amp; that)</font></td>
<td>Copy construct.</td>
</tr>
<tr>
<td width="586"><font face="Courier New">unsigned int <br />
<b>insert</b>(const
polygon_set_data&lt;coordinate_type&gt;&amp; ps)</font></td>
<td>I<font face="Times New Roman">nsert a polygon set graph
node, the value returned is the id of the graph node.</font></td>
</tr>
<tr>
<td width="586"><font face="Courier New">
template &lt;class GeoObjT&gt;<br />
unsigned int <b>insert</b>(const GeoObjT&amp; geoObj)</font></td>
<td>Insert a geometry object that is a refinement of
polygon set as a graph node, the return value is the id of the graph
node.</td>
</tr>
<tr>
<td width="586"><font face="Courier New">
template &lt;class GraphT&gt;<br />
void <b>extract</b>(GraphT&amp; graph)</font></td>
<td>Accepts a graph object that conforms to the
expectations defined above.&nbsp; Performs connectivity extraction and
populates the graph object.</td>
</tr>
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<td style="background-color: rgb(238, 238, 238);" nowrap="1"
valign="top"> &nbsp;</td>
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<colgroup> <col class="docinfo-name" /><col
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<th class="docinfo-name">Copyright:</th>
<td>Copyright <20> Intel Corporation 2008-2010.</td>
</tr>
<tr class="field">
<th class="docinfo-name">License:</th>
<td class="field-body">Distributed under the Boost Software
License, Version 1.0. (See accompanying file <tt class="literal"> <span
class="pre">LICENSE_1_0.txt</span></tt> or copy at <a
class="reference" target="_top"
href="http://www.boost.org/LICENSE_1_0.txt">
http://www.boost.org/LICENSE_1_0.txt</a>)</td>
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