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<h1>boost/geometry/algorithms/centroid.hpp</h1><a href="algorithms_2centroid_8hpp.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// Boost.Geometry (aka GGL, Generic Geometry Library)</span>
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<a name="l00002"></a>00002 <span class="comment">//</span>
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<a name="l00003"></a>00003 <span class="comment">// Copyright Barend Gehrels 2007-2009, Geodan, Amsterdam, the Netherlands.</span>
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||
<a name="l00004"></a>00004 <span class="comment">// Copyright Bruno Lalande 2008, 2009</span>
|
||
<a name="l00005"></a>00005 <span class="comment">// Copyright (c) 2009 Mateusz Loskot <mateusz@loskot.net></span>
|
||
<a name="l00006"></a>00006 <span class="comment">// Use, modification and distribution is subject to the Boost Software License,</span>
|
||
<a name="l00007"></a>00007 <span class="comment">// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at</span>
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||
<a name="l00008"></a>00008 <span class="comment">// http://www.boost.org/LICENSE_1_0.txt)</span>
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<a name="l00009"></a>00009
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||
<a name="l00010"></a>00010 <span class="preprocessor">#ifndef BOOST_GEOMETRY_ALGORITHMS_CENTROID_HPP</span>
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<a name="l00011"></a>00011 <span class="preprocessor"></span><span class="preprocessor">#define BOOST_GEOMETRY_ALGORITHMS_CENTROID_HPP</span>
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<a name="l00012"></a>00012 <span class="preprocessor"></span>
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<a name="l00013"></a>00013 <span class="preprocessor">#include <cstddef></span>
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<a name="l00014"></a>00014
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<a name="l00015"></a>00015 <span class="preprocessor">#include <boost/range/functions.hpp></span>
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||
<a name="l00016"></a>00016 <span class="preprocessor">#include <boost/range/metafunctions.hpp></span>
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||
<a name="l00017"></a>00017
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||
<a name="l00018"></a>00018 <span class="preprocessor">#include <<a class="code" href="algorithms_2distance_8hpp.html">boost/geometry/algorithms/distance.hpp</a>></span>
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||
<a name="l00019"></a>00019 <span class="preprocessor">#include <<a class="code" href="cs_8hpp.html">boost/geometry/core/cs.hpp</a>></span>
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||
<a name="l00020"></a>00020 <span class="preprocessor">#include <<a class="code" href="coordinate__dimension_8hpp.html">boost/geometry/core/coordinate_dimension.hpp</a>></span>
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||
<a name="l00021"></a>00021 <span class="preprocessor">#include <<a class="code" href="exception_8hpp.html">boost/geometry/core/exception.hpp</a>></span>
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||
<a name="l00022"></a>00022 <span class="preprocessor">#include <<a class="code" href="exterior__ring_8hpp.html">boost/geometry/core/exterior_ring.hpp</a>></span>
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<a name="l00023"></a>00023 <span class="preprocessor">#include <<a class="code" href="interior__rings_8hpp.html">boost/geometry/core/interior_rings.hpp</a>></span>
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<a name="l00024"></a>00024 <span class="preprocessor">#include <<a class="code" href="geometries_2concepts_2check_8hpp.html">boost/geometry/geometries/concepts/check.hpp</a>></span>
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<a name="l00025"></a>00025 <span class="preprocessor">#include <<a class="code" href="segment__iterator_8hpp.html">boost/geometry/iterators/segment_iterator.hpp</a>></span>
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<a name="l00026"></a>00026 <span class="preprocessor">#include <<a class="code" href="strategies_2centroid_8hpp.html">boost/geometry/strategies/centroid.hpp</a>></span>
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||
<a name="l00027"></a>00027 <span class="preprocessor">#include <<a class="code" href="centroid__concept_8hpp.html">boost/geometry/strategies/concepts/centroid_concept.hpp</a>></span>
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<a name="l00028"></a>00028 <span class="preprocessor">#include <<a class="code" href="copy_8hpp.html">boost/geometry/util/copy.hpp</a>></span>
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<a name="l00029"></a>00029 <span class="preprocessor">#include <<a class="code" href="for__each__coordinate_8hpp.html">boost/geometry/util/for_each_coordinate.hpp</a>></span>
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<a name="l00030"></a>00030
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<a name="l00031"></a>00031
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||
<a name="l00068"></a>00068 <span class="keyword">namespace </span>boost { <span class="keyword">namespace </span>geometry
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||
<a name="l00069"></a>00069 {
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||
<a name="l00070"></a>00070
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||
<a name="l00071"></a><a class="code" href="classboost_1_1geometry_1_1centroid__exception.html">00071</a> <span class="keyword">class </span><a class="code" href="classboost_1_1geometry_1_1centroid__exception.html">centroid_exception</a> : <span class="keyword">public</span> geometry::<a class="code" href="structboost_1_1geometry_1_1exception.html" title="Base exception class for GGL.">exception</a>
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||
<a name="l00072"></a>00072 {
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||
<a name="l00073"></a>00073 <span class="keyword">public</span>:
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||
<a name="l00074"></a>00074
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||
<a name="l00075"></a><a class="code" href="classboost_1_1geometry_1_1centroid__exception.html#a7f89d82571adc93bd774789cb3bfacf">00075</a> <span class="keyword">inline</span> <a class="code" href="classboost_1_1geometry_1_1centroid__exception.html#a7f89d82571adc93bd774789cb3bfacf">centroid_exception</a>() {}
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||
<a name="l00076"></a>00076
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||
<a name="l00077"></a><a class="code" href="classboost_1_1geometry_1_1centroid__exception.html#53fc09976554829bab5269f436d60d10">00077</a> <span class="keyword">virtual</span> <span class="keywordtype">char</span> <span class="keyword">const</span>* <a class="code" href="classboost_1_1geometry_1_1centroid__exception.html#53fc09976554829bab5269f436d60d10">what</a>() <span class="keyword">const</span> throw()
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||
<a name="l00078"></a>00078 {
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||
<a name="l00079"></a>00079 <span class="keywordflow">return</span> <span class="stringliteral">"GGL Centroid calculation exception"</span>;
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||
<a name="l00080"></a>00080 }
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||
<a name="l00081"></a>00081 };
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||
<a name="l00082"></a>00082
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||
<a name="l00083"></a>00083 <span class="preprocessor">#ifndef DOXYGEN_NO_DETAIL</span>
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||
<a name="l00084"></a>00084 <span class="preprocessor"></span><span class="keyword">namespace </span>detail { <span class="keyword">namespace </span><a class="code" href="group__centroid.html#g7f67098dd56aba656f32b3635b66d105" title="Calculate centroid using a specified strategy.">centroid</a> {
|
||
<a name="l00085"></a>00085
|
||
<a name="l00086"></a>00086 <span class="keyword">template</span><<span class="keyword">typename</span> Po<span class="keywordtype">int</span>, <span class="keyword">typename</span> Po<span class="keywordtype">int</span>Centro<span class="keywordtype">id</span>, <span class="keyword">typename</span> Strategy>
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||
<a name="l00087"></a>00087 <span class="keyword">struct </span>centroid_point
|
||
<a name="l00088"></a>00088 {
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||
<a name="l00089"></a>00089 <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> apply(Point <span class="keyword">const</span>& point, PointCentroid& <a class="code" href="group__centroid.html#g7f67098dd56aba656f32b3635b66d105" title="Calculate centroid using a specified strategy.">centroid</a>,
|
||
<a name="l00090"></a>00090 Strategy <span class="keyword">const</span>&)
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||
<a name="l00091"></a>00091 {
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||
<a name="l00092"></a>00092 <a class="code" href="namespaceboost_1_1geometry.html#ff15abe2a4412c1913d5c4d5875f45f7" title="Copies coordinates from source to destination point.">copy_coordinates</a>(point, centroid);
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||
<a name="l00093"></a>00093 }
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||
<a name="l00094"></a>00094 };
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||
<a name="l00095"></a>00095
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||
<a name="l00096"></a>00096 <span class="keyword">template</span>
|
||
<a name="l00097"></a>00097 <
|
||
<a name="l00098"></a>00098 <span class="keyword">typename</span> Box,
|
||
<a name="l00099"></a>00099 <span class="keyword">typename</span> Point,
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||
<a name="l00100"></a>00100 std::size_t Dimension,
|
||
<a name="l00101"></a>00101 std::size_t DimensionCount
|
||
<a name="l00102"></a>00102 >
|
||
<a name="l00103"></a>00103 <span class="keyword">struct </span>centroid_box_calculator
|
||
<a name="l00104"></a>00104 {
|
||
<a name="l00105"></a>00105 <span class="keyword">typedef</span> <span class="keyword">typename</span> select_coordinate_type
|
||
<a name="l00106"></a>00106 <
|
||
<a name="l00107"></a>00107 Box, Point
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||
<a name="l00108"></a>00108 >::type coordinate_type;
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||
<a name="l00109"></a>00109 <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> apply(Box <span class="keyword">const</span>& box, Point& <a class="code" href="group__centroid.html#g7f67098dd56aba656f32b3635b66d105" title="Calculate centroid using a specified strategy.">centroid</a>)
|
||
<a name="l00110"></a>00110 {
|
||
<a name="l00111"></a>00111 coordinate_type <span class="keyword">const</span> c1 = get<min_corner, Dimension>(box);
|
||
<a name="l00112"></a>00112 coordinate_type <span class="keyword">const</span> c2 = get<max_corner, Dimension>(box);
|
||
<a name="l00113"></a>00113 coordinate_type m = c1 + c2;
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||
<a name="l00114"></a>00114 m /= 2.0;
|
||
<a name="l00115"></a>00115
|
||
<a name="l00116"></a>00116 set<Dimension>(centroid, m);
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||
<a name="l00117"></a>00117
|
||
<a name="l00118"></a>00118 centroid_box_calculator
|
||
<a name="l00119"></a>00119 <
|
||
<a name="l00120"></a>00120 Box, Point,
|
||
<a name="l00121"></a>00121 Dimension + 1, DimensionCount
|
||
<a name="l00122"></a>00122 >::apply(box, centroid);
|
||
<a name="l00123"></a>00123 }
|
||
<a name="l00124"></a>00124 };
|
||
<a name="l00125"></a>00125
|
||
<a name="l00126"></a>00126 <span class="keyword">template</span><<span class="keyword">typename</span> Box, <span class="keyword">typename</span> Po<span class="keywordtype">int</span>, std::<span class="keywordtype">size_t</span> DimensionCount>
|
||
<a name="l00127"></a>00127 <span class="keyword">struct </span>centroid_box_calculator<Box, Point, DimensionCount, DimensionCount>
|
||
<a name="l00128"></a>00128 {
|
||
<a name="l00129"></a>00129 <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> apply(Box <span class="keyword">const</span>& , Point& )
|
||
<a name="l00130"></a>00130 {
|
||
<a name="l00131"></a>00131 }
|
||
<a name="l00132"></a>00132 };
|
||
<a name="l00133"></a>00133
|
||
<a name="l00134"></a>00134 <span class="keyword">template</span><<span class="keyword">typename</span> Box, <span class="keyword">typename</span> Po<span class="keywordtype">int</span>, <span class="keyword">typename</span> Strategy>
|
||
<a name="l00135"></a>00135 <span class="keyword">struct </span>centroid_box
|
||
<a name="l00136"></a>00136 {
|
||
<a name="l00137"></a>00137 <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> apply(Box <span class="keyword">const</span>& box, Point& <a class="code" href="group__centroid.html#g7f67098dd56aba656f32b3635b66d105" title="Calculate centroid using a specified strategy.">centroid</a>,
|
||
<a name="l00138"></a>00138 Strategy <span class="keyword">const</span>&)
|
||
<a name="l00139"></a>00139 {
|
||
<a name="l00140"></a>00140 centroid_box_calculator
|
||
<a name="l00141"></a>00141 <
|
||
<a name="l00142"></a>00142 Box, Point,
|
||
<a name="l00143"></a>00143 0, <a class="code" href="classcore__dispatch_1_1dimension.html">dimension<Box>::type::value</a>
|
||
<a name="l00144"></a>00144 >::apply(box, centroid);
|
||
<a name="l00145"></a>00145 }
|
||
<a name="l00146"></a>00146 };
|
||
<a name="l00147"></a>00147
|
||
<a name="l00148"></a>00148 <span class="comment">// There is one thing where centroid is different from e.g. within.</span>
|
||
<a name="l00149"></a>00149 <span class="comment">// If the ring has only one point, it might make sense that</span>
|
||
<a name="l00150"></a>00150 <span class="comment">// that point is the centroid.</span>
|
||
<a name="l00151"></a>00151 <span class="keyword">template</span><<span class="keyword">typename</span> Po<span class="keywordtype">int</span>, <span class="keyword">typename</span> Range>
|
||
<a name="l00152"></a>00152 <span class="keyword">inline</span> <span class="keywordtype">bool</span> range_ok(Range <span class="keyword">const</span>& range, Point& <a class="code" href="group__centroid.html#g7f67098dd56aba656f32b3635b66d105" title="Calculate centroid using a specified strategy.">centroid</a>)
|
||
<a name="l00153"></a>00153 {
|
||
<a name="l00154"></a>00154 std::size_t <span class="keyword">const</span> n = boost::size(range);
|
||
<a name="l00155"></a>00155 <span class="keywordflow">if</span> (n > 1)
|
||
<a name="l00156"></a>00156 {
|
||
<a name="l00157"></a>00157 <span class="keywordflow">return</span> <span class="keyword">true</span>;
|
||
<a name="l00158"></a>00158 }
|
||
<a name="l00159"></a>00159 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (n <= 0)
|
||
<a name="l00160"></a>00160 {
|
||
<a name="l00161"></a>00161 <span class="preprocessor">#if defined(CENTROID_WITH_CATCH)</span>
|
||
<a name="l00162"></a>00162 <span class="preprocessor"></span> <span class="keywordflow">throw</span> centroid_exception();
|
||
<a name="l00163"></a>00163 <span class="preprocessor">#endif</span>
|
||
<a name="l00164"></a>00164 <span class="preprocessor"></span> <span class="keywordflow">return</span> <span class="keyword">false</span>;
|
||
<a name="l00165"></a>00165 }
|
||
<a name="l00166"></a>00166 <span class="keywordflow">else</span> <span class="comment">// if (n == 1)</span>
|
||
<a name="l00167"></a>00167 {
|
||
<a name="l00168"></a>00168 <span class="comment">// Take over the first point in a "coordinate neutral way"</span>
|
||
<a name="l00169"></a>00169 <a class="code" href="namespaceboost_1_1geometry.html#ff15abe2a4412c1913d5c4d5875f45f7" title="Copies coordinates from source to destination point.">copy_coordinates</a>(range.front(), centroid);
|
||
<a name="l00170"></a>00170 <span class="keywordflow">return</span> <span class="keyword">false</span>;
|
||
<a name="l00171"></a>00171 }
|
||
<a name="l00172"></a>00172 <span class="keywordflow">return</span> <span class="keyword">true</span>;
|
||
<a name="l00173"></a>00173 }
|
||
<a name="l00174"></a>00174
|
||
<a name="l00175"></a>00175
|
||
<a name="l00179"></a>00179 <span class="keyword">template</span><<span class="keyword">typename</span> Ring, <span class="keyword">typename</span> Strategy>
|
||
<a name="l00180"></a>00180 <span class="keyword">struct </span>centroid_ring_state
|
||
<a name="l00181"></a>00181 {
|
||
<a name="l00182"></a>00182 <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> apply(Ring <span class="keyword">const</span>& ring,
|
||
<a name="l00183"></a>00183 Strategy <span class="keyword">const</span>& strategy, <span class="keyword">typename</span> Strategy::state_type& state)
|
||
<a name="l00184"></a>00184 {
|
||
<a name="l00185"></a>00185 <span class="keyword">typedef</span> <span class="keyword">typename</span> boost::range_const_iterator<Ring>::type iterator_type;
|
||
<a name="l00186"></a>00186 iterator_type it = boost::begin(ring);
|
||
<a name="l00187"></a>00187 <span class="keywordflow">for</span> (iterator_type previous = it++;
|
||
<a name="l00188"></a>00188 it != boost::end(ring);
|
||
<a name="l00189"></a>00189 previous = it++)
|
||
<a name="l00190"></a>00190 {
|
||
<a name="l00191"></a>00191 Strategy::apply(*previous, *it, state);
|
||
<a name="l00192"></a>00192 }
|
||
<a name="l00193"></a>00193
|
||
<a name="l00194"></a>00194 <span class="comment">/* using segment_iterator: nice, well looking, but much slower...</span>
|
||
<a name="l00195"></a>00195 <span class="comment"> normal iterator: 0.156 s</span>
|
||
<a name="l00196"></a>00196 <span class="comment"> segment iterator: 1.985 s...</span>
|
||
<a name="l00197"></a>00197 <span class="comment"> typedef segment_iterator</span>
|
||
<a name="l00198"></a>00198 <span class="comment"> <</span>
|
||
<a name="l00199"></a>00199 <span class="comment"> typename boost::range_const_iterator<Ring>::type,</span>
|
||
<a name="l00200"></a>00200 <span class="comment"> typename point_type<Ring>::type</span>
|
||
<a name="l00201"></a>00201 <span class="comment"> > iterator_type;</span>
|
||
<a name="l00202"></a>00202 <span class="comment"></span>
|
||
<a name="l00203"></a>00203 <span class="comment"> iterator_type it(boost::begin(ring), boost::end(ring));</span>
|
||
<a name="l00204"></a>00204 <span class="comment"> iterator_type end(boost::end(ring));</span>
|
||
<a name="l00205"></a>00205 <span class="comment"> for(; it != end; ++it)</span>
|
||
<a name="l00206"></a>00206 <span class="comment"> {</span>
|
||
<a name="l00207"></a>00207 <span class="comment"> Strategy::apply(it->first, it->second, state);</span>
|
||
<a name="l00208"></a>00208 <span class="comment"> }</span>
|
||
<a name="l00209"></a>00209 <span class="comment"> */</span>
|
||
<a name="l00210"></a>00210 }
|
||
<a name="l00211"></a>00211 };
|
||
<a name="l00212"></a>00212
|
||
<a name="l00213"></a>00213 <span class="keyword">template</span><<span class="keyword">typename</span> Ring, <span class="keyword">typename</span> Po<span class="keywordtype">int</span>, <span class="keyword">typename</span> Strategy>
|
||
<a name="l00214"></a>00214 <span class="keyword">struct </span>centroid_ring
|
||
<a name="l00215"></a>00215 {
|
||
<a name="l00216"></a>00216 <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> apply(Ring <span class="keyword">const</span>& ring, Point& centroid,
|
||
<a name="l00217"></a>00217 Strategy <span class="keyword">const</span>& strategy)
|
||
<a name="l00218"></a>00218 {
|
||
<a name="l00219"></a>00219 <span class="keywordflow">if</span> (range_ok(ring, centroid))
|
||
<a name="l00220"></a>00220 {
|
||
<a name="l00221"></a>00221 <span class="keyword">typename</span> Strategy::state_type state;
|
||
<a name="l00222"></a>00222 centroid_ring_state
|
||
<a name="l00223"></a>00223 <
|
||
<a name="l00224"></a>00224 Ring,
|
||
<a name="l00225"></a>00225 Strategy
|
||
<a name="l00226"></a>00226 >::apply(ring, strategy, state);
|
||
<a name="l00227"></a>00227 Strategy::result(state, centroid);
|
||
<a name="l00228"></a>00228 }
|
||
<a name="l00229"></a>00229 }
|
||
<a name="l00230"></a>00230 };
|
||
<a name="l00231"></a>00231
|
||
<a name="l00235"></a>00235 <span class="keyword">template</span><<span class="keyword">typename</span> Line<span class="keywordtype">string</span>, <span class="keyword">typename</span> Po<span class="keywordtype">int</span>, <span class="keyword">typename</span> Strategy>
|
||
<a name="l00236"></a>00236 <span class="keyword">struct </span>centroid_linestring
|
||
<a name="l00237"></a>00237 {
|
||
<a name="l00238"></a>00238 <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> apply(Linestring <span class="keyword">const</span>& line, Point& centroid,
|
||
<a name="l00239"></a>00239 Strategy <span class="keyword">const</span>& strategy)
|
||
<a name="l00240"></a>00240 {
|
||
<a name="l00241"></a>00241 <span class="comment">// First version, should</span>
|
||
<a name="l00242"></a>00242 <span class="comment">// - be moved to a strategy</span>
|
||
<a name="l00243"></a>00243 <span class="comment">// - be made dim-agnostic</span>
|
||
<a name="l00244"></a>00244
|
||
<a name="l00245"></a>00245 <span class="keyword">typedef</span> <span class="keyword">typename</span> point_type<Linestring>::type point_type;
|
||
<a name="l00246"></a>00246 <span class="keyword">typedef</span> <span class="keyword">typename</span> boost::range_const_iterator<Linestring>::type point_iterator_type;
|
||
<a name="l00247"></a>00247 <span class="keyword">typedef</span> segment_iterator<point_iterator_type, point_type> segment_iterator;
|
||
<a name="l00248"></a>00248
|
||
<a name="l00249"></a>00249 <span class="keywordtype">double</span> <a class="code" href="group__length.html#g1537537131cd91037cf3ad9fd80d50f1" title="Calculate length of a geometry.">length</a> = double();
|
||
<a name="l00250"></a>00250 std::pair<double, double> average_sum;
|
||
<a name="l00251"></a>00251
|
||
<a name="l00252"></a>00252 segment_iterator it(boost::begin(line), boost::end(line));
|
||
<a name="l00253"></a>00253 segment_iterator end(boost::end(line));
|
||
<a name="l00254"></a>00254 <span class="keywordflow">while</span> (it != end)
|
||
<a name="l00255"></a>00255 {
|
||
<a name="l00256"></a>00256 <span class="keywordtype">double</span> <span class="keyword">const</span> d = <a class="code" href="group__distance.html#g8fb8022d64a75b24c80a64ba46ec4738" title="Calculate distance between two geometries with a specified strategy.">geometry::distance</a>(it->first, it->second);
|
||
<a name="l00257"></a>00257 length += d;
|
||
<a name="l00258"></a>00258
|
||
<a name="l00259"></a>00259 <span class="keywordtype">double</span> <span class="keyword">const</span> mx = (get<0>(it->first) + get<0>(it->second)) / 2;
|
||
<a name="l00260"></a>00260 <span class="keywordtype">double</span> <span class="keyword">const</span> my = (get<1>(it->first) + get<1>(it->second)) / 2;
|
||
<a name="l00261"></a>00261 average_sum.first += d * mx;
|
||
<a name="l00262"></a>00262 average_sum.second += d * my;
|
||
<a name="l00263"></a>00263 ++it;
|
||
<a name="l00264"></a>00264 }
|
||
<a name="l00265"></a>00265
|
||
<a name="l00266"></a>00266 set<0>(centroid, average_sum.first / length );
|
||
<a name="l00267"></a>00267 set<1>(centroid, average_sum.second / length );
|
||
<a name="l00268"></a>00268 }
|
||
<a name="l00269"></a>00269 };
|
||
<a name="l00270"></a>00270
|
||
<a name="l00276"></a>00276 <span class="keyword">template</span><<span class="keyword">typename</span> Polygon, <span class="keyword">typename</span> Strategy>
|
||
<a name="l00277"></a>00277 <span class="keyword">struct </span>centroid_polygon_state
|
||
<a name="l00278"></a>00278 {
|
||
<a name="l00279"></a>00279 <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> apply(Polygon <span class="keyword">const</span>& poly,
|
||
<a name="l00280"></a>00280 Strategy <span class="keyword">const</span>& strategy, <span class="keyword">typename</span> Strategy::state_type& state)
|
||
<a name="l00281"></a>00281 {
|
||
<a name="l00282"></a>00282 <span class="keyword">typedef</span> centroid_ring_state
|
||
<a name="l00283"></a>00283 <
|
||
<a name="l00284"></a>00284 <span class="keyword">typename</span> ring_type<Polygon>::type,
|
||
<a name="l00285"></a>00285 Strategy
|
||
<a name="l00286"></a>00286 > per_ring;
|
||
<a name="l00287"></a>00287
|
||
<a name="l00288"></a>00288 per_ring::apply(<a class="code" href="group__access.html#gd96ba07cd3c6c3216bd5ab69adc9ccb5" title="Function to get the exterior_ring ring of a polygon.">exterior_ring</a>(poly), strategy, state);
|
||
<a name="l00289"></a>00289
|
||
<a name="l00290"></a>00290 <span class="keywordflow">for</span> (<span class="keyword">typename</span> boost::range_const_iterator
|
||
<a name="l00291"></a>00291 <
|
||
<a name="l00292"></a>00292 <span class="keyword">typename</span> interior_type<Polygon>::type
|
||
<a name="l00293"></a>00293 >::type it = boost::begin(<a class="code" href="group__access.html#g5af585b056bb80bf3dfe7c07ad30d84a" title="Function to get the interior rings of a polygon (non const version).">interior_rings</a>(poly));
|
||
<a name="l00294"></a>00294 it != boost::end(<a class="code" href="group__access.html#g5af585b056bb80bf3dfe7c07ad30d84a" title="Function to get the interior rings of a polygon (non const version).">interior_rings</a>(poly));
|
||
<a name="l00295"></a>00295 ++it)
|
||
<a name="l00296"></a>00296 {
|
||
<a name="l00297"></a>00297 per_ring::apply(*it, strategy, state);
|
||
<a name="l00298"></a>00298 }
|
||
<a name="l00299"></a>00299 }
|
||
<a name="l00300"></a>00300 };
|
||
<a name="l00301"></a>00301
|
||
<a name="l00302"></a>00302 <span class="keyword">template</span><<span class="keyword">typename</span> Polygon, <span class="keyword">typename</span> Po<span class="keywordtype">int</span>, <span class="keyword">typename</span> Strategy>
|
||
<a name="l00303"></a>00303 <span class="keyword">struct </span>centroid_polygon
|
||
<a name="l00304"></a>00304 {
|
||
<a name="l00305"></a>00305 <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> apply(Polygon <span class="keyword">const</span>& poly, Point& centroid,
|
||
<a name="l00306"></a>00306 Strategy <span class="keyword">const</span>& strategy)
|
||
<a name="l00307"></a>00307 {
|
||
<a name="l00308"></a>00308 <span class="keywordflow">if</span> (range_ok(<a class="code" href="group__access.html#gd96ba07cd3c6c3216bd5ab69adc9ccb5" title="Function to get the exterior_ring ring of a polygon.">exterior_ring</a>(poly), centroid))
|
||
<a name="l00309"></a>00309 {
|
||
<a name="l00310"></a>00310 <span class="keyword">typename</span> Strategy::state_type state;
|
||
<a name="l00311"></a>00311 centroid_polygon_state
|
||
<a name="l00312"></a>00312 <
|
||
<a name="l00313"></a>00313 Polygon,
|
||
<a name="l00314"></a>00314 Strategy
|
||
<a name="l00315"></a>00315 >::apply(poly, strategy, state);
|
||
<a name="l00316"></a>00316 Strategy::result(state, centroid);
|
||
<a name="l00317"></a>00317 }
|
||
<a name="l00318"></a>00318 }
|
||
<a name="l00319"></a>00319 };
|
||
<a name="l00320"></a>00320
|
||
<a name="l00321"></a>00321
|
||
<a name="l00322"></a>00322 }} <span class="comment">// namespace detail::centroid</span>
|
||
<a name="l00323"></a>00323 <span class="preprocessor">#endif // DOXYGEN_NO_DETAIL</span>
|
||
<a name="l00324"></a>00324 <span class="preprocessor"></span>
|
||
<a name="l00325"></a>00325
|
||
<a name="l00326"></a>00326 <span class="preprocessor">#ifndef DOXYGEN_NO_DISPATCH</span>
|
||
<a name="l00327"></a>00327 <span class="preprocessor"></span><span class="keyword">namespace </span>dispatch
|
||
<a name="l00328"></a>00328 {
|
||
<a name="l00329"></a>00329
|
||
<a name="l00330"></a>00330 <span class="keyword">template</span>
|
||
<a name="l00331"></a>00331 <
|
||
<a name="l00332"></a>00332 <span class="keyword">typename</span> Tag,
|
||
<a name="l00333"></a>00333 <span class="keyword">typename</span> Geometry,
|
||
<a name="l00334"></a>00334 <span class="keyword">typename</span> Point,
|
||
<a name="l00335"></a>00335 <span class="keyword">typename</span> Strategy
|
||
<a name="l00336"></a>00336 >
|
||
<a name="l00337"></a>00337 <span class="keyword">struct </span>centroid {};
|
||
<a name="l00338"></a>00338
|
||
<a name="l00339"></a>00339 <span class="keyword">template</span>
|
||
<a name="l00340"></a>00340 <
|
||
<a name="l00341"></a>00341 <span class="keyword">typename</span> Geometry,
|
||
<a name="l00342"></a>00342 <span class="keyword">typename</span> Point,
|
||
<a name="l00343"></a>00343 <span class="keyword">typename</span> Strategy
|
||
<a name="l00344"></a>00344 >
|
||
<a name="l00345"></a>00345 <span class="keyword">struct </span>centroid<point_tag, Geometry, Point, Strategy>
|
||
<a name="l00346"></a>00346 : detail::centroid::centroid_point<Geometry, Point, Strategy>
|
||
<a name="l00347"></a>00347 {};
|
||
<a name="l00348"></a>00348
|
||
<a name="l00349"></a>00349 <span class="keyword">template</span>
|
||
<a name="l00350"></a>00350 <
|
||
<a name="l00351"></a>00351 <span class="keyword">typename</span> Box,
|
||
<a name="l00352"></a>00352 <span class="keyword">typename</span> Point,
|
||
<a name="l00353"></a>00353 <span class="keyword">typename</span> Strategy
|
||
<a name="l00354"></a>00354 >
|
||
<a name="l00355"></a>00355 <span class="keyword">struct </span>centroid<box_tag, Box, Point, Strategy>
|
||
<a name="l00356"></a>00356 : detail::centroid::centroid_box<Box, Point, Strategy>
|
||
<a name="l00357"></a>00357 {};
|
||
<a name="l00358"></a>00358
|
||
<a name="l00359"></a>00359 <span class="keyword">template</span> <<span class="keyword">typename</span> Ring, <span class="keyword">typename</span> Po<span class="keywordtype">int</span>, <span class="keyword">typename</span> Strategy>
|
||
<a name="l00360"></a>00360 <span class="keyword">struct </span>centroid<ring_tag, Ring, Point, Strategy>
|
||
<a name="l00361"></a>00361 : detail::centroid::centroid_ring<Ring, Point, Strategy>
|
||
<a name="l00362"></a>00362 {};
|
||
<a name="l00363"></a>00363
|
||
<a name="l00364"></a>00364 <span class="keyword">template</span> <<span class="keyword">typename</span> Line<span class="keywordtype">string</span>, <span class="keyword">typename</span> Po<span class="keywordtype">int</span>, <span class="keyword">typename</span> Strategy>
|
||
<a name="l00365"></a>00365 <span class="keyword">struct </span>centroid<linestring_tag, Linestring, Point, Strategy>
|
||
<a name="l00366"></a>00366 : detail::centroid::centroid_linestring<Linestring, Point, Strategy>
|
||
<a name="l00367"></a>00367 {};
|
||
<a name="l00368"></a>00368
|
||
<a name="l00369"></a>00369 <span class="keyword">template</span> <<span class="keyword">typename</span> Polygon, <span class="keyword">typename</span> Po<span class="keywordtype">int</span>, <span class="keyword">typename</span> Strategy>
|
||
<a name="l00370"></a>00370 <span class="keyword">struct </span>centroid<polygon_tag, Polygon, Point, Strategy>
|
||
<a name="l00371"></a>00371 : detail::centroid::centroid_polygon<Polygon, Point, Strategy>
|
||
<a name="l00372"></a>00372 {};
|
||
<a name="l00373"></a>00373
|
||
<a name="l00374"></a>00374 } <span class="comment">// namespace dispatch</span>
|
||
<a name="l00375"></a>00375 <span class="preprocessor">#endif // DOXYGEN_NO_DISPATCH</span>
|
||
<a name="l00376"></a>00376 <span class="preprocessor"></span>
|
||
<a name="l00377"></a>00377
|
||
<a name="l00385"></a>00385 <span class="keyword">template</span><<span class="keyword">typename</span> Geometry, <span class="keyword">typename</span> Po<span class="keywordtype">int</span>, <span class="keyword">typename</span> Strategy>
|
||
<a name="l00386"></a><a class="code" href="group__centroid.html#g7f67098dd56aba656f32b3635b66d105">00386</a> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="group__centroid.html#g7f67098dd56aba656f32b3635b66d105" title="Calculate centroid using a specified strategy.">centroid</a>(Geometry <span class="keyword">const</span>& geometry, Point& c,
|
||
<a name="l00387"></a>00387 Strategy <span class="keyword">const</span>& strategy)
|
||
<a name="l00388"></a>00388 {
|
||
<a name="l00389"></a>00389 <span class="comment">//BOOST_CONCEPT_ASSERT( (geometry::concept::CentroidStrategy<Strategy>) );</span>
|
||
<a name="l00390"></a>00390
|
||
<a name="l00391"></a>00391 concept::check_concepts_and_equal_dimensions<Point, const Geometry>();
|
||
<a name="l00392"></a>00392
|
||
<a name="l00393"></a>00393 <span class="keyword">typedef</span> <span class="keyword">typename</span> <a class="code" href="structboost_1_1geometry_1_1point__type.html" title="Meta-function which defines point type of any geometry.">point_type<Geometry>::type</a> point_type;
|
||
<a name="l00394"></a>00394
|
||
<a name="l00395"></a>00395 <span class="comment">// Call dispatch apply method. That one returns true if centroid</span>
|
||
<a name="l00396"></a>00396 <span class="comment">// should be taken from state.</span>
|
||
<a name="l00397"></a>00397 <a class="code" href="group__centroid.html#g7f67098dd56aba656f32b3635b66d105" title="Calculate centroid using a specified strategy.">dispatch::centroid</a>
|
||
<a name="l00398"></a>00398 <
|
||
<a name="l00399"></a>00399 <span class="keyword">typename</span> <a class="code" href="structboost_1_1geometry_1_1geometry__not__recognized__tag.html" title="&quot;default&quot; tag">tag<Geometry>::type</a>,
|
||
<a name="l00400"></a>00400 Geometry,
|
||
<a name="l00401"></a>00401 Point,
|
||
<a name="l00402"></a>00402 Strategy
|
||
<a name="l00403"></a>00403 >::apply(geometry, c, strategy);
|
||
<a name="l00404"></a>00404 }
|
||
<a name="l00405"></a>00405
|
||
<a name="l00406"></a>00406
|
||
<a name="l00413"></a>00413 <span class="keyword">template</span><<span class="keyword">typename</span> Geometry, <span class="keyword">typename</span> Po<span class="keywordtype">int</span>>
|
||
<a name="l00414"></a><a class="code" href="group__centroid.html#g6ba67d019f82f28401213b6096224892">00414</a> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="group__centroid.html#g7f67098dd56aba656f32b3635b66d105" title="Calculate centroid using a specified strategy.">centroid</a>(Geometry <span class="keyword">const</span>& geometry, Point& c)
|
||
<a name="l00415"></a>00415 {
|
||
<a name="l00416"></a>00416 concept::check_concepts_and_equal_dimensions<Point, const Geometry>();
|
||
<a name="l00417"></a>00417
|
||
<a name="l00418"></a>00418 <span class="keyword">typedef</span> <span class="keyword">typename</span> <a class="code" href="structboost_1_1geometry_1_1strategy__centroid.html" title="Traits class binding a centroid calculation strategy to a coordinate system.">strategy_centroid</a>
|
||
<a name="l00419"></a>00419 <
|
||
<a name="l00420"></a>00420 <span class="keyword">typename</span> <a class="code" href="structboost_1_1geometry_1_1cs__tag.html" title="Meta-function returning coordinate system tag (cs family) of any geometry.">cs_tag<Geometry>::type</a>,
|
||
<a name="l00421"></a>00421 <span class="keyword">typename</span> <a class="code" href="structboost_1_1geometry_1_1geometry__not__recognized__tag.html" title="&quot;default&quot; tag">tag<Geometry>::type</a>,
|
||
<a name="l00422"></a>00422 <a class="code" href="structboost_1_1geometry_1_1dimension.html" title="Meta-function which defines coordinate dimensions, i.e. the number of axes of any...">dimension<Geometry>::type::value</a>,
|
||
<a name="l00423"></a>00423 Point,
|
||
<a name="l00424"></a>00424 Geometry
|
||
<a name="l00425"></a>00425 >::type strategy_type;
|
||
<a name="l00426"></a>00426
|
||
<a name="l00427"></a>00427 <a class="code" href="group__centroid.html#g7f67098dd56aba656f32b3635b66d105" title="Calculate centroid using a specified strategy.">centroid</a>(geometry, c, strategy_type());
|
||
<a name="l00428"></a>00428 }
|
||
<a name="l00429"></a>00429
|
||
<a name="l00430"></a>00430
|
||
<a name="l00437"></a>00437 <span class="keyword">template</span><<span class="keyword">typename</span> Po<span class="keywordtype">int</span>, <span class="keyword">typename</span> Geometry>
|
||
<a name="l00438"></a><a class="code" href="group__centroid.html#gc7afddb71d27110bc3d8366bb752e2c6">00438</a> <span class="keyword">inline</span> Point <a class="code" href="group__centroid.html#gc7afddb71d27110bc3d8366bb752e2c6" title="Calculate and return centroid.">make_centroid</a>(Geometry <span class="keyword">const</span>& geometry)
|
||
<a name="l00439"></a>00439 {
|
||
<a name="l00440"></a>00440 concept::check_concepts_and_equal_dimensions<Point, const Geometry>();
|
||
<a name="l00441"></a>00441
|
||
<a name="l00442"></a>00442 Point c;
|
||
<a name="l00443"></a>00443 <a class="code" href="group__centroid.html#g7f67098dd56aba656f32b3635b66d105" title="Calculate centroid using a specified strategy.">centroid</a>(geometry, c);
|
||
<a name="l00444"></a>00444 <span class="keywordflow">return</span> c;
|
||
<a name="l00445"></a>00445 }
|
||
<a name="l00446"></a>00446
|
||
<a name="l00454"></a>00454 <span class="keyword">template</span><<span class="keyword">typename</span> Po<span class="keywordtype">int</span>, <span class="keyword">typename</span> Geometry, <span class="keyword">typename</span> Strategy>
|
||
<a name="l00455"></a><a class="code" href="group__centroid.html#g02af164c207ab95f31c62d3fcfab7cff">00455</a> <span class="keyword">inline</span> Point <a class="code" href="group__centroid.html#gc7afddb71d27110bc3d8366bb752e2c6" title="Calculate and return centroid.">make_centroid</a>(Geometry <span class="keyword">const</span>& geometry, Strategy <span class="keyword">const</span>& strategy)
|
||
<a name="l00456"></a>00456 {
|
||
<a name="l00457"></a>00457 <span class="comment">//BOOST_CONCEPT_ASSERT( (geometry::concept::CentroidStrategy<Strategy>) );</span>
|
||
<a name="l00458"></a>00458
|
||
<a name="l00459"></a>00459 concept::check_concepts_and_equal_dimensions<Point, const Geometry>();
|
||
<a name="l00460"></a>00460
|
||
<a name="l00461"></a>00461 Point c;
|
||
<a name="l00462"></a>00462 <a class="code" href="group__centroid.html#g7f67098dd56aba656f32b3635b66d105" title="Calculate centroid using a specified strategy.">centroid</a>(geometry, c, strategy);
|
||
<a name="l00463"></a>00463 <span class="keywordflow">return</span> c;
|
||
<a name="l00464"></a>00464 }
|
||
<a name="l00465"></a>00465
|
||
<a name="l00466"></a>00466 }} <span class="comment">// namespace boost::geometry</span>
|
||
<a name="l00467"></a>00467
|
||
<a name="l00468"></a>00468 <span class="preprocessor">#endif // BOOST_GEOMETRY_ALGORITHMS_CENTROID_HPP</span>
|
||
</pre></div></div>
|
||
<hr size="1">
|
||
<table width="100%">
|
||
<tbody>
|
||
<tr>
|
||
<td align="left"><small>
|
||
<p>December 1, 2009</p>
|
||
</small></td>
|
||
<td align="right">
|
||
<small>Copyright <20> 1995-2009 Barend Gehrels, Geodan, Amsterdam<br>
|
||
Copyright <20> 2008-2009 Bruno Lalande, Paris<br>
|
||
Copyright <20> 2009 Mateusz Loskot, Cadcorp, London<br>
|
||
</small>
|
||
</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
|
||
<address style="text-align: right;"><small>
|
||
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