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<h1>BinaryOp.h</h1> </div>
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<div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/**********************************************************************</span>
<a name="l00002"></a>00002 <span class="comment"> * $Id: BinaryOp.h 2757 2009-12-01 15:39:41Z mloskot $</span>
<a name="l00003"></a>00003 <span class="comment"> *</span>
<a name="l00004"></a>00004 <span class="comment"> * GEOS - Geometry Engine Open Source</span>
<a name="l00005"></a>00005 <span class="comment"> * http://geos.refractions.net</span>
<a name="l00006"></a>00006 <span class="comment"> *</span>
<a name="l00007"></a>00007 <span class="comment"> * Copyright (C) 2006 Refractions Research Inc.</span>
<a name="l00008"></a>00008 <span class="comment"> *</span>
<a name="l00009"></a>00009 <span class="comment"> * This is free software; you can redistribute and/or modify it under</span>
<a name="l00010"></a>00010 <span class="comment"> * the terms of the GNU Lesser General Public Licence as published</span>
<a name="l00011"></a>00011 <span class="comment"> * by the Free Software Foundation. </span>
<a name="l00012"></a>00012 <span class="comment"> * See the COPYING file for more information.</span>
<a name="l00013"></a>00013 <span class="comment"> *</span>
<a name="l00014"></a>00014 <span class="comment"> **********************************************************************</span>
<a name="l00015"></a>00015 <span class="comment"> *</span>
<a name="l00016"></a>00016 <span class="comment"> * Last port: ORIGINAL WORK</span>
<a name="l00017"></a>00017 <span class="comment"> *</span>
<a name="l00018"></a>00018 <span class="comment"> **********************************************************************</span>
<a name="l00019"></a>00019 <span class="comment"> *</span>
<a name="l00020"></a>00020 <span class="comment"> * This file provides a single templated function, taking two</span>
<a name="l00021"></a>00021 <span class="comment"> * const Geometry pointers, applying a binary operator to them</span>
<a name="l00022"></a>00022 <span class="comment"> * and returning a result Geometry in an auto_ptr<>.</span>
<a name="l00023"></a>00023 <span class="comment"> *</span>
<a name="l00024"></a>00024 <span class="comment"> * The binary operator is expected to take two const Geometry pointers</span>
<a name="l00025"></a>00025 <span class="comment"> * and return a newly allocated Geometry pointer, possibly throwing</span>
<a name="l00026"></a>00026 <span class="comment"> * a TopologyException to signal it couldn't succeed due to robustness</span>
<a name="l00027"></a>00027 <span class="comment"> * issues.</span>
<a name="l00028"></a>00028 <span class="comment"> *</span>
<a name="l00029"></a>00029 <span class="comment"> * This function will catch TopologyExceptions and try again with</span>
<a name="l00030"></a>00030 <span class="comment"> * slightly modified versions of the input. The following heuristic</span>
<a name="l00031"></a>00031 <span class="comment"> * is used:</span>
<a name="l00032"></a>00032 <span class="comment"> *</span>
<a name="l00033"></a>00033 <span class="comment"> * - Try with original input.</span>
<a name="l00034"></a>00034 <span class="comment"> * - Try removing common bits from input coordinate values</span>
<a name="l00035"></a>00035 <span class="comment"> * - Try snaping input geometries to each other</span>
<a name="l00036"></a>00036 <span class="comment"> * - Try snaping input coordinates to a increasing grid (size from 1/25 to 1)</span>
<a name="l00037"></a>00037 <span class="comment"> * - Try simplifiying input with increasing tolerance (from 0.01 to 0.04)</span>
<a name="l00038"></a>00038 <span class="comment"> *</span>
<a name="l00039"></a>00039 <span class="comment"> * If none of the step succeeds the original exception is thrown.</span>
<a name="l00040"></a>00040 <span class="comment"> *</span>
<a name="l00041"></a>00041 <span class="comment"> * Note that you can skip Grid snapping, Geometry snapping and Simplify policies</span>
<a name="l00042"></a>00042 <span class="comment"> * by a compile-time define when building geos.</span>
<a name="l00043"></a>00043 <span class="comment"> * See USE_TP_SIMPLIFY_POLICY, USE_PRECISION_REDUCTION_POLICY and</span>
<a name="l00044"></a>00044 <span class="comment"> * USE_SNAPPING_POLICY macros below.</span>
<a name="l00045"></a>00045 <span class="comment"> *</span>
<a name="l00046"></a>00046 <span class="comment"> *</span>
<a name="l00047"></a>00047 <span class="comment"> **********************************************************************/</span>
<a name="l00048"></a>00048
<a name="l00049"></a>00049 <span class="preprocessor">#ifndef GEOS_GEOM_BINARYOP_H</span>
<a name="l00050"></a>00050 <span class="preprocessor"></span><span class="preprocessor">#define GEOS_GEOM_BINARYOP_H</span>
<a name="l00051"></a>00051 <span class="preprocessor"></span>
<a name="l00052"></a>00052 <span class="preprocessor">#include <geos/geom/Geometry.h></span>
<a name="l00053"></a>00053 <span class="preprocessor">#include <geos/geom/PrecisionModel.h></span>
<a name="l00054"></a>00054 <span class="preprocessor">#include <geos/precision/CommonBitsRemover.h></span>
<a name="l00055"></a>00055 <span class="preprocessor">#include <geos/precision/SimpleGeometryPrecisionReducer.h></span>
<a name="l00056"></a>00056
<a name="l00057"></a>00057 <span class="preprocessor">#include <geos/operation/overlay/snap/GeometrySnapper.h></span>
<a name="l00058"></a>00058
<a name="l00059"></a>00059 <span class="preprocessor">#include <geos/simplify/TopologyPreservingSimplifier.h></span>
<a name="l00060"></a>00060 <span class="preprocessor">#include <geos/operation/valid/IsValidOp.h></span>
<a name="l00061"></a>00061 <span class="preprocessor">#include <geos/util/TopologyException.h></span>
<a name="l00062"></a>00062 <span class="preprocessor">#include <geos/util.h></span>
<a name="l00063"></a>00063
<a name="l00064"></a>00064 <span class="preprocessor">#include <memory></span> <span class="comment">// for auto_ptr</span>
<a name="l00065"></a>00065
<a name="l00066"></a>00066 <span class="comment">//#define GEOS_DEBUG_BINARYOP 1</span>
<a name="l00067"></a>00067
<a name="l00068"></a>00068
<a name="l00069"></a>00069 <span class="comment">/*</span>
<a name="l00070"></a>00070 <span class="comment"> * Always try original input first</span>
<a name="l00071"></a>00071 <span class="comment"> */</span>
<a name="l00072"></a>00072 <span class="preprocessor">#ifndef USE_ORIGINAL_INPUT</span>
<a name="l00073"></a>00073 <span class="preprocessor"></span><span class="preprocessor"># define USE_ORIGINAL_INPUT 1</span>
<a name="l00074"></a>00074 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00075"></a>00075 <span class="preprocessor"></span>
<a name="l00076"></a>00076 <span class="comment">/*</span>
<a name="l00077"></a>00077 <span class="comment"> * Define this to use PrecisionReduction policy</span>
<a name="l00078"></a>00078 <span class="comment"> * in an attempt at by-passing binary operation</span>
<a name="l00079"></a>00079 <span class="comment"> * robustness problems (handles TopologyExceptions)</span>
<a name="l00080"></a>00080 <span class="comment"> */</span>
<a name="l00081"></a>00081 <span class="preprocessor">#ifndef USE_PRECISION_REDUCTION_POLICY</span>
<a name="l00082"></a>00082 <span class="preprocessor"></span><span class="comment">//# define USE_PRECISION_REDUCTION_POLICY 1</span>
<a name="l00083"></a>00083 <span class="preprocessor">#endif</span>
<a name="l00084"></a>00084 <span class="preprocessor"></span>
<a name="l00085"></a>00085 <span class="comment">/*</span>
<a name="l00086"></a>00086 <span class="comment"> * Define this to use TopologyPreserving simplification policy</span>
<a name="l00087"></a>00087 <span class="comment"> * in an attempt at by-passing binary operation</span>
<a name="l00088"></a>00088 <span class="comment"> * robustness problems (handles TopologyExceptions)</span>
<a name="l00089"></a>00089 <span class="comment"> */</span>
<a name="l00090"></a>00090 <span class="preprocessor">#ifndef USE_TP_SIMPLIFY_POLICY </span>
<a name="l00091"></a>00091 <span class="preprocessor"></span><span class="comment">//# define USE_TP_SIMPLIFY_POLICY 1</span>
<a name="l00092"></a>00092 <span class="preprocessor">#endif</span>
<a name="l00093"></a>00093 <span class="preprocessor"></span>
<a name="l00094"></a>00094 <span class="comment">/*</span>
<a name="l00095"></a>00095 <span class="comment"> * Use common bits removal policy.</span>
<a name="l00096"></a>00096 <span class="comment"> * If enabled, this would be tried /before/</span>
<a name="l00097"></a>00097 <span class="comment"> * Geometry snapping.</span>
<a name="l00098"></a>00098 <span class="comment"> */</span>
<a name="l00099"></a>00099 <span class="preprocessor">#ifndef USE_COMMONBITS_POLICY</span>
<a name="l00100"></a>00100 <span class="preprocessor"></span><span class="preprocessor"># define USE_COMMONBITS_POLICY 1</span>
<a name="l00101"></a>00101 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00102"></a>00102 <span class="preprocessor"></span>
<a name="l00103"></a>00103 <span class="comment">/*</span>
<a name="l00104"></a>00104 <span class="comment"> * Use snapping policy</span>
<a name="l00105"></a>00105 <span class="comment"> */</span>
<a name="l00106"></a>00106 <span class="preprocessor">#ifndef USE_SNAPPING_POLICY</span>
<a name="l00107"></a>00107 <span class="preprocessor"></span><span class="preprocessor"># define USE_SNAPPING_POLICY 1</span>
<a name="l00108"></a>00108 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00109"></a>00109 <span class="preprocessor"></span>
<a name="l00110"></a>00110 <span class="keyword">namespace </span>geos {
<a name="l00111"></a>00111 <span class="keyword">namespace </span>geom { <span class="comment">// geos::geom</span>
<a name="l00112"></a>00112
<a name="l00113"></a>00113 <span class="keyword">inline</span> <span class="keywordtype">bool</span>
<a name="l00114"></a>00114 check_valid(<span class="keyword">const</span> Geometry& g, <span class="keyword">const</span> std::string& label)
<a name="l00115"></a>00115 {
<a name="l00116"></a>00116 operation::valid::IsValidOp ivo(&g);
<a name="l00117"></a>00117 <span class="keywordflow">if</span> ( ! ivo.isValid() )
<a name="l00118"></a>00118 {
<a name="l00119"></a>00119 std::cerr << label << <span class="stringliteral">": is invalid!"</span>
<a name="l00120"></a>00120 << ivo.getValidationError()->toString() << std::endl;
<a name="l00121"></a>00121 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00122"></a>00122 }
<a name="l00123"></a>00123 <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00124"></a>00124 }
<a name="l00125"></a>00125
<a name="l00131"></a>00131 <span class="keyword">template</span> <<span class="keyword">class</span> BinOp>
<a name="l00132"></a>00132 std::auto_ptr<Geometry>
<a name="l00133"></a><a class="code" href="namespacegeos_1_1geom.html#aac47cb336ecaac60f80faf87991b85ab">00133</a> <a class="code" href="namespacegeos_1_1geom.html#aac47cb336ecaac60f80faf87991b85ab" title="Apply a binary operation to the given geometries after snapping them to each other after common-bits ...">SnapOp</a>(<span class="keyword">const</span> <a class="code" href="classgeos_1_1geom_1_1Geometry.html" title="Basic implementation of Geometry, constructed and destructed by GeometryFactory.">Geometry</a>* g0, <span class="keyword">const</span> <a class="code" href="classgeos_1_1geom_1_1Geometry.html" title="Basic implementation of Geometry, constructed and destructed by GeometryFactory.">Geometry</a> *g1, BinOp _Op)
<a name="l00134"></a>00134 {
<a name="l00135"></a>00135 <span class="keyword">typedef</span> std::auto_ptr<Geometry> GeomPtr;
<a name="l00136"></a>00136
<a name="l00137"></a>00137 <span class="preprocessor">#define CBR_BEFORE_SNAPPING 1</span>
<a name="l00138"></a>00138 <span class="preprocessor"></span>
<a name="l00139"></a>00139 <span class="comment">//using geos::precision::GeometrySnapper;</span>
<a name="l00140"></a>00140 <span class="keyword">using</span> <a class="code" href="classgeos_1_1operation_1_1overlay_1_1snap_1_1GeometrySnapper.html" title="Snaps the vertices and segments of a geometry to another&#39;s vertices. Should improve robustness fo...">geos::operation::overlay::snap::GeometrySnapper</a>;
<a name="l00141"></a>00141
<a name="l00142"></a>00142 <span class="comment">// Snap tolerance must be computed on the original</span>
<a name="l00143"></a>00143 <span class="comment">// (not commonbits-removed) geoms</span>
<a name="l00144"></a>00144 <span class="keywordtype">double</span> snapTolerance = GeometrySnapper::computeOverlaySnapTolerance(*g0, *g1);
<a name="l00145"></a>00145 <span class="preprocessor">#if GEOS_DEBUG_BINARYOP</span>
<a name="l00146"></a>00146 <span class="preprocessor"></span> std::cerr<<<span class="stringliteral">"Computed snap tolerance: "</span><<snapTolerance<<std::endl;
<a name="l00147"></a>00147 <span class="preprocessor">#endif</span>
<a name="l00148"></a>00148 <span class="preprocessor"></span>
<a name="l00149"></a>00149 <a class="code" href="classgeos_1_1precision_1_1CommonBitsRemover.html" title="Allow computing and removing common mantissa bits from one or more Geometries.">geos::precision::CommonBitsRemover</a> cbr;
<a name="l00150"></a>00150
<a name="l00151"></a>00151 <span class="preprocessor">#if CBR_BEFORE_SNAPPING</span>
<a name="l00152"></a>00152 <span class="preprocessor"></span> <span class="comment">// Now remove common bits</span>
<a name="l00153"></a>00153 GeomPtr rG0( cbr.<a class="code" href="classgeos_1_1precision_1_1CommonBitsRemover.html#a20cd039d70a230af7bff843593bb8d6e" title="Removes the common coordinate bits from a Geometry. The coordinates of the Geometry are changed...">removeCommonBits</a>(g0-><a class="code" href="classgeos_1_1geom_1_1Geometry.html#a25b5ab073477cee2d5b756a0d163c006" title="Make a deep-copy of this Geometry.">clone</a>()) );
<a name="l00154"></a>00154 GeomPtr rG1( cbr.<a class="code" href="classgeos_1_1precision_1_1CommonBitsRemover.html#a20cd039d70a230af7bff843593bb8d6e" title="Removes the common coordinate bits from a Geometry. The coordinates of the Geometry are changed...">removeCommonBits</a>(g1-><a class="code" href="classgeos_1_1geom_1_1Geometry.html#a25b5ab073477cee2d5b756a0d163c006" title="Make a deep-copy of this Geometry.">clone</a>()) );
<a name="l00155"></a>00155
<a name="l00156"></a>00156 <span class="preprocessor">#if GEOS_DEBUG_BINARYOP</span>
<a name="l00157"></a>00157 <span class="preprocessor"></span> check_valid(*rG0, <span class="stringliteral">"CBR: removed-bits geom 0"</span>);
<a name="l00158"></a>00158 check_valid(*rG1, <span class="stringliteral">"CBR: removed-bits geom 1"</span>);
<a name="l00159"></a>00159 <span class="preprocessor">#endif</span>
<a name="l00160"></a>00160 <span class="preprocessor"></span>
<a name="l00161"></a>00161 <span class="keyword">const</span> <a class="code" href="classgeos_1_1geom_1_1Geometry.html" title="Basic implementation of Geometry, constructed and destructed by GeometryFactory.">Geometry</a>& operand0 = *rG0;
<a name="l00162"></a>00162 <span class="keyword">const</span> <a class="code" href="classgeos_1_1geom_1_1Geometry.html" title="Basic implementation of Geometry, constructed and destructed by GeometryFactory.">Geometry</a>& operand1 = *rG1;
<a name="l00163"></a>00163 <span class="preprocessor">#else // don't CBR before snapping</span>
<a name="l00164"></a>00164 <span class="preprocessor"></span> <span class="keyword">const</span> <a class="code" href="classgeos_1_1geom_1_1Geometry.html" title="Basic implementation of Geometry, constructed and destructed by GeometryFactory.">Geometry</a>& operand0 = *g0
<a name="l00165"></a>00165 <span class="keyword">const</span> <a class="code" href="classgeos_1_1geom_1_1Geometry.html" title="Basic implementation of Geometry, constructed and destructed by GeometryFactory.">Geometry</a>& operand1 = *g1
<a name="l00166"></a>00166 <span class="preprocessor">#endif</span>
<a name="l00167"></a>00167 <span class="preprocessor"></span>
<a name="l00168"></a>00168 GeometrySnapper snapper0( operand0 );
<a name="l00169"></a>00169 GeomPtr snapG0( snapper0.snapTo(operand1, snapTolerance) );
<a name="l00170"></a>00170
<a name="l00171"></a>00171 <span class="comment">// NOTE: second geom is snapped on the snapped first one</span>
<a name="l00172"></a>00172 GeometrySnapper snapper1( operand1 );
<a name="l00173"></a>00173 GeomPtr snapG1( snapper1.snapTo(*snapG0, snapTolerance) );
<a name="l00174"></a>00174
<a name="l00175"></a>00175 <span class="preprocessor">#if GEOS_DEBUG_BINARYOP</span>
<a name="l00176"></a>00176 <span class="preprocessor"></span> check_valid(*snapG0, <span class="stringliteral">"SNAP: snapped geom 0"</span>);
<a name="l00177"></a>00177 check_valid(*snapG1, <span class="stringliteral">"SNAP: snapped geom 1"</span>);
<a name="l00178"></a>00178 <span class="preprocessor">#endif</span>
<a name="l00179"></a>00179 <span class="preprocessor"></span>
<a name="l00180"></a>00180 <span class="comment">// Run the binary op</span>
<a name="l00181"></a>00181 GeomPtr result( _Op(snapG0.get(), snapG1.get()) );
<a name="l00182"></a>00182
<a name="l00183"></a>00183 <span class="preprocessor">#if GEOS_DEBUG_BINARYOP</span>
<a name="l00184"></a>00184 <span class="preprocessor"></span> check_valid(*result, <span class="stringliteral">"Op result (before common-bits addition"</span>);
<a name="l00185"></a>00185 <span class="preprocessor">#endif</span>
<a name="l00186"></a>00186 <span class="preprocessor"></span>
<a name="l00187"></a>00187 <span class="preprocessor">#if CBR_BEFORE_SNAPPING</span>
<a name="l00188"></a>00188 <span class="preprocessor"></span> <span class="comment">// Add common bits back in</span>
<a name="l00189"></a>00189 cbr.<a class="code" href="classgeos_1_1precision_1_1CommonBitsRemover.html#a286e6fd6378012f2c3feef6f131e46e6" title="Adds the common coordinate bits back into a Geometry. The coordinates of the Geometry are changed...">addCommonBits</a>( result.get() );
<a name="l00190"></a>00190 <span class="preprocessor">#endif</span>
<a name="l00191"></a>00191 <span class="preprocessor"></span>
<a name="l00192"></a>00192 <span class="preprocessor">#if GEOS_DEBUG_BINARYOP</span>
<a name="l00193"></a>00193 <span class="preprocessor"></span> check_valid(*result, <span class="stringliteral">"Op result (after common-bits addition"</span>);
<a name="l00194"></a>00194 <span class="preprocessor">#endif</span>
<a name="l00195"></a>00195 <span class="preprocessor"></span>
<a name="l00196"></a>00196 <span class="keywordflow">return</span> result;
<a name="l00197"></a>00197 }
<a name="l00198"></a>00198
<a name="l00199"></a>00199 <span class="keyword">template</span> <<span class="keyword">class</span> BinOp>
<a name="l00200"></a>00200 std::auto_ptr<Geometry>
<a name="l00201"></a>00201 BinaryOp(<span class="keyword">const</span> Geometry* g0, <span class="keyword">const</span> Geometry *g1, BinOp _Op)
<a name="l00202"></a>00202 {
<a name="l00203"></a>00203 <span class="keyword">typedef</span> std::auto_ptr<Geometry> GeomPtr;
<a name="l00204"></a>00204
<a name="l00205"></a>00205 GeomPtr ret;
<a name="l00206"></a>00206 <a class="code" href="classgeos_1_1util_1_1TopologyException.html" title="Indicates an invalid or inconsistent topological situation encountered during processing.">util::TopologyException</a> origException;
<a name="l00207"></a>00207
<a name="l00208"></a>00208 <span class="preprocessor">#ifdef USE_ORIGINAL_INPUT</span>
<a name="l00209"></a>00209 <span class="preprocessor"></span> <span class="comment">// Try with original input</span>
<a name="l00210"></a>00210 <span class="keywordflow">try</span>
<a name="l00211"></a>00211 {
<a name="l00212"></a>00212 <span class="preprocessor">#if GEOS_DEBUG_BINARYOP</span>
<a name="l00213"></a>00213 <span class="preprocessor"></span> std::cerr << <span class="stringliteral">"Trying with original input."</span> << std::endl;
<a name="l00214"></a>00214 <span class="preprocessor">#endif</span>
<a name="l00215"></a>00215 <span class="preprocessor"></span> ret.reset(_Op(g0, g1));
<a name="l00216"></a>00216 <span class="keywordflow">return</span> ret;
<a name="l00217"></a>00217 }
<a name="l00218"></a>00218 <span class="keywordflow">catch</span> (<span class="keyword">const</span> util::TopologyException& ex)
<a name="l00219"></a>00219 {
<a name="l00220"></a>00220 origException=ex;
<a name="l00221"></a>00221 <span class="preprocessor">#if GEOS_DEBUG_BINARYOP</span>
<a name="l00222"></a>00222 <span class="preprocessor"></span> std::cerr << <span class="stringliteral">"Original exception: "</span> << ex.what() << std::endl;
<a name="l00223"></a>00223 <span class="preprocessor">#endif</span>
<a name="l00224"></a>00224 <span class="preprocessor"></span> }
<a name="l00225"></a>00225 <span class="preprocessor">#endif // USE_ORIGINAL_INPUT</span>
<a name="l00226"></a>00226 <span class="preprocessor"></span>
<a name="l00227"></a>00227
<a name="l00228"></a>00228 <span class="preprocessor">#ifdef USE_COMMONBITS_POLICY</span>
<a name="l00229"></a>00229 <span class="preprocessor"></span> <span class="comment">// Try removing common bits (possibly obsoleted by snapping below)</span>
<a name="l00230"></a>00230 <span class="keywordflow">try</span>
<a name="l00231"></a>00231 {
<a name="l00232"></a>00232 GeomPtr rG0;
<a name="l00233"></a>00233 GeomPtr rG1;
<a name="l00234"></a>00234 precision::CommonBitsRemover cbr;
<a name="l00235"></a>00235
<a name="l00236"></a>00236 <span class="preprocessor">#if GEOS_DEBUG_BINARYOP</span>
<a name="l00237"></a>00237 <span class="preprocessor"></span> std::cerr << <span class="stringliteral">"Trying with Common bits remover."</span> << std::endl;
<a name="l00238"></a>00238 <span class="preprocessor">#endif</span>
<a name="l00239"></a>00239 <span class="preprocessor"></span>
<a name="l00240"></a>00240 cbr.add(g0);
<a name="l00241"></a>00241 cbr.add(g1);
<a name="l00242"></a>00242
<a name="l00243"></a>00243 rG0.reset( cbr.removeCommonBits(g0->clone()) );
<a name="l00244"></a>00244 rG1.reset( cbr.removeCommonBits(g1->clone()) );
<a name="l00245"></a>00245
<a name="l00246"></a>00246 <span class="preprocessor">#if GEOS_DEBUG_BINARYOP</span>
<a name="l00247"></a>00247 <span class="preprocessor"></span> <span class="keywordflow">if</span> ( ! rG0->isValid() )
<a name="l00248"></a>00248 {
<a name="l00249"></a>00249 std::cerr << <span class="stringliteral">" CBR: geom 0 is invalid!"</span> << std::endl;
<a name="l00250"></a>00250 }
<a name="l00251"></a>00251
<a name="l00252"></a>00252 <span class="keywordflow">if</span> ( ! rG1->isValid() )
<a name="l00253"></a>00253 {
<a name="l00254"></a>00254 std::cerr << <span class="stringliteral">" CBR: geom 1 is invalid!"</span> << std::endl;
<a name="l00255"></a>00255 }
<a name="l00256"></a>00256 <span class="preprocessor">#endif</span>
<a name="l00257"></a>00257 <span class="preprocessor"></span>
<a name="l00258"></a>00258 ret.reset( _Op(rG0.get(), rG1.get()) );
<a name="l00259"></a>00259
<a name="l00260"></a>00260 cbr.addCommonBits( ret.get() );
<a name="l00261"></a>00261
<a name="l00262"></a>00262 <span class="keywordflow">return</span> ret;
<a name="l00263"></a>00263 }
<a name="l00264"></a>00264 <span class="keywordflow">catch</span> (<span class="keyword">const</span> util::TopologyException& ex)
<a name="l00265"></a>00265 {
<a name="l00266"></a>00266 ::geos::ignore_unused_variable_warning(ex);
<a name="l00267"></a>00267 <span class="preprocessor">#if GEOS_DEBUG_BINARYOP</span>
<a name="l00268"></a>00268 <span class="preprocessor"></span> std::cerr << <span class="stringliteral">"CBR: "</span> << ex.what() << std::endl;
<a name="l00269"></a>00269 <span class="preprocessor">#endif</span>
<a name="l00270"></a>00270 <span class="preprocessor"></span> }
<a name="l00271"></a>00271 <span class="preprocessor">#endif</span>
<a name="l00272"></a>00272 <span class="preprocessor"></span>
<a name="l00273"></a>00273 <span class="comment">// Try with snapping</span>
<a name="l00274"></a>00274 <span class="comment">//</span>
<a name="l00275"></a>00275 <span class="comment">// TODO: possible optimization would be reusing the</span>
<a name="l00276"></a>00276 <span class="comment">// already common-bit-removed inputs and just</span>
<a name="l00277"></a>00277 <span class="comment">// apply geometry snapping, whereas the current</span>
<a name="l00278"></a>00278 <span class="comment">// SnapOp function does both.</span>
<a name="l00279"></a>00279 <span class="comment">// {</span>
<a name="l00280"></a>00280 <span class="preprocessor">#if USE_SNAPPING_POLICY</span>
<a name="l00281"></a>00281 <span class="preprocessor"></span>
<a name="l00282"></a>00282 <span class="preprocessor">#if GEOS_DEBUG_BINARYOP</span>
<a name="l00283"></a>00283 <span class="preprocessor"></span> std::cerr << <span class="stringliteral">"Trying with snapping "</span> << std::endl;
<a name="l00284"></a>00284 <span class="preprocessor">#endif</span>
<a name="l00285"></a>00285 <span class="preprocessor"></span>
<a name="l00286"></a>00286 <span class="keywordflow">try</span> {
<a name="l00287"></a>00287 ret = <a class="code" href="namespacegeos_1_1geom.html#aac47cb336ecaac60f80faf87991b85ab" title="Apply a binary operation to the given geometries after snapping them to each other after common-bits ...">SnapOp</a>(g0, g1, _Op);
<a name="l00288"></a>00288 <span class="preprocessor">#if GEOS_DEBUG_BINARYOP</span>
<a name="l00289"></a>00289 <span class="preprocessor"></span> std::cerr << <span class="stringliteral">"SnapOp succeeded"</span> << std::endl;
<a name="l00290"></a>00290 <span class="preprocessor">#endif</span>
<a name="l00291"></a>00291 <span class="preprocessor"></span> <span class="keywordflow">return</span> ret;
<a name="l00292"></a>00292
<a name="l00293"></a>00293 }
<a name="l00294"></a>00294 <span class="keywordflow">catch</span> (<span class="keyword">const</span> util::TopologyException& ex)
<a name="l00295"></a>00295 {
<a name="l00296"></a>00296 ::geos::ignore_unused_variable_warning(ex);
<a name="l00297"></a>00297 <span class="preprocessor">#if GEOS_DEBUG_BINARYOP</span>
<a name="l00298"></a>00298 <span class="preprocessor"></span> std::cerr << <span class="stringliteral">"SNAP: "</span> << ex.what() << std::endl;
<a name="l00299"></a>00299 <span class="preprocessor">#endif</span>
<a name="l00300"></a>00300 <span class="preprocessor"></span> }
<a name="l00301"></a>00301
<a name="l00302"></a>00302 <span class="preprocessor">#endif // USE_SNAPPING_POLICY }</span>
<a name="l00303"></a>00303 <span class="preprocessor"></span>
<a name="l00304"></a>00304
<a name="l00305"></a>00305
<a name="l00306"></a>00306 <span class="comment">// {</span>
<a name="l00307"></a>00307 <span class="preprocessor">#if USE_PRECISION_REDUCTION_POLICY</span>
<a name="l00308"></a>00308 <span class="preprocessor"></span>
<a name="l00309"></a>00309
<a name="l00310"></a>00310 <span class="comment">// Try reducing precision</span>
<a name="l00311"></a>00311 <span class="keywordflow">try</span>
<a name="l00312"></a>00312 {
<a name="l00313"></a>00313 <span class="keywordtype">int</span> maxPrecision=25;
<a name="l00314"></a>00314
<a name="l00315"></a>00315 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> precision=maxPrecision; precision; --precision)
<a name="l00316"></a>00316 {
<a name="l00317"></a>00317 std::auto_ptr<PrecisionModel> pm(<span class="keyword">new</span> PrecisionModel(precision));
<a name="l00318"></a>00318 <span class="preprocessor">#if GEOS_DEBUG_BINARYOP</span>
<a name="l00319"></a>00319 <span class="preprocessor"></span> std::cerr << <span class="stringliteral">"Trying with precision "</span> << precision << std::endl;
<a name="l00320"></a>00320 <span class="preprocessor">#endif</span>
<a name="l00321"></a>00321 <span class="preprocessor"></span>
<a name="l00322"></a>00322 precision::SimpleGeometryPrecisionReducer reducer( pm.get() );
<a name="l00323"></a>00323 GeomPtr rG0( reducer.reduce(g0) );
<a name="l00324"></a>00324 GeomPtr rG1( reducer.reduce(g1) );
<a name="l00325"></a>00325
<a name="l00326"></a>00326 <span class="keywordflow">try</span>
<a name="l00327"></a>00327 {
<a name="l00328"></a>00328 ret.reset( _Op(rG0.get(), rG1.get()) );
<a name="l00329"></a>00329 <span class="keywordflow">return</span> ret;
<a name="l00330"></a>00330 }
<a name="l00331"></a>00331 <span class="keywordflow">catch</span> (<span class="keyword">const</span> util::TopologyException& ex)
<a name="l00332"></a>00332 {
<a name="l00333"></a>00333 <span class="keywordflow">if</span> ( precision == 1 ) <span class="keywordflow">throw</span> ex;
<a name="l00334"></a>00334 <span class="preprocessor">#if GEOS_DEBUG_BINARYOP</span>
<a name="l00335"></a>00335 <span class="preprocessor"></span> std::cerr << <span class="stringliteral">"Reduced with precision ("</span> << precision << <span class="stringliteral">"): "</span>
<a name="l00336"></a>00336 << ex.what() << std::endl;
<a name="l00337"></a>00337 <span class="preprocessor">#endif</span>
<a name="l00338"></a>00338 <span class="preprocessor"></span> }
<a name="l00339"></a>00339
<a name="l00340"></a>00340 }
<a name="l00341"></a>00341
<a name="l00342"></a>00342 }
<a name="l00343"></a>00343 <span class="keywordflow">catch</span> (<span class="keyword">const</span> util::TopologyException& ex)
<a name="l00344"></a>00344 {
<a name="l00345"></a>00345 <span class="preprocessor">#if GEOS_DEBUG_BINARYOP</span>
<a name="l00346"></a>00346 <span class="preprocessor"></span> std::cerr << <span class="stringliteral">"Reduced: "</span> << ex.what() << std::endl;
<a name="l00347"></a>00347 <span class="preprocessor">#endif</span>
<a name="l00348"></a>00348 <span class="preprocessor"></span> }
<a name="l00349"></a>00349
<a name="l00350"></a>00350 <span class="preprocessor">#endif</span>
<a name="l00351"></a>00351 <span class="preprocessor"></span><span class="comment">// USE_PRECISION_REDUCTION_POLICY }</span>
<a name="l00352"></a>00352
<a name="l00353"></a>00353 <span class="comment">// {</span>
<a name="l00354"></a>00354 <span class="preprocessor">#if USE_TP_SIMPLIFY_POLICY </span>
<a name="l00355"></a>00355 <span class="preprocessor"></span>
<a name="l00356"></a>00356 <span class="comment">// Try simplifying</span>
<a name="l00357"></a>00357 <span class="keywordflow">try</span>
<a name="l00358"></a>00358 {
<a name="l00359"></a>00359
<a name="l00360"></a>00360 <span class="keywordtype">double</span> maxTolerance = 0.04;
<a name="l00361"></a>00361 <span class="keywordtype">double</span> minTolerance = 0.01;
<a name="l00362"></a>00362 <span class="keywordtype">double</span> tolStep = 0.01;
<a name="l00363"></a>00363
<a name="l00364"></a>00364 <span class="keywordflow">for</span> (<span class="keywordtype">double</span> tol = minTolerance; tol <= maxTolerance; tol += tolStep)
<a name="l00365"></a>00365 {
<a name="l00366"></a>00366 <span class="preprocessor">#if GEOS_DEBUG_BINARYOP</span>
<a name="l00367"></a>00367 <span class="preprocessor"></span> std::cerr << <span class="stringliteral">"Trying simplifying with tolerance "</span> << tol << std::endl;
<a name="l00368"></a>00368 <span class="preprocessor">#endif</span>
<a name="l00369"></a>00369 <span class="preprocessor"></span>
<a name="l00370"></a>00370 GeomPtr rG0( simplify::TopologyPreservingSimplifier::simplify(g0, tol) );
<a name="l00371"></a>00371 GeomPtr rG1( simplify::TopologyPreservingSimplifier::simplify(g1, tol) );
<a name="l00372"></a>00372
<a name="l00373"></a>00373 <span class="keywordflow">try</span>
<a name="l00374"></a>00374 {
<a name="l00375"></a>00375 ret.reset( _Op(rG0.get(), rG1.get()) );
<a name="l00376"></a>00376 <span class="keywordflow">return</span> ret;
<a name="l00377"></a>00377 }
<a name="l00378"></a>00378 <span class="keywordflow">catch</span> (<span class="keyword">const</span> util::TopologyException& ex)
<a name="l00379"></a>00379 {
<a name="l00380"></a>00380 <span class="keywordflow">if</span> ( tol >= maxTolerance ) <span class="keywordflow">throw</span> ex;
<a name="l00381"></a>00381 <span class="preprocessor">#if GEOS_DEBUG_BINARYOP</span>
<a name="l00382"></a>00382 <span class="preprocessor"></span> std::cerr << <span class="stringliteral">"Simplified with tolerance ("</span> << tol << <span class="stringliteral">"): "</span>
<a name="l00383"></a>00383 << ex.what() << std::endl;
<a name="l00384"></a>00384 <span class="preprocessor">#endif</span>
<a name="l00385"></a>00385 <span class="preprocessor"></span> }
<a name="l00386"></a>00386
<a name="l00387"></a>00387 }
<a name="l00388"></a>00388
<a name="l00389"></a>00389 <span class="keywordflow">return</span> ret;
<a name="l00390"></a>00390
<a name="l00391"></a>00391 }
<a name="l00392"></a>00392 <span class="keywordflow">catch</span> (<span class="keyword">const</span> util::TopologyException& ex)
<a name="l00393"></a>00393 {
<a name="l00394"></a>00394 <span class="preprocessor">#if GEOS_DEBUG_BINARYOP</span>
<a name="l00395"></a>00395 <span class="preprocessor"></span> std::cerr << <span class="stringliteral">"Simplified: "</span> << ex.what() << std::endl;
<a name="l00396"></a>00396 <span class="preprocessor">#endif</span>
<a name="l00397"></a>00397 <span class="preprocessor"></span> }
<a name="l00398"></a>00398
<a name="l00399"></a>00399 <span class="preprocessor">#endif</span>
<a name="l00400"></a>00400 <span class="preprocessor"></span><span class="comment">// USE_TP_SIMPLIFY_POLICY }</span>
<a name="l00401"></a>00401
<a name="l00402"></a>00402 <span class="keywordflow">throw</span> origException;
<a name="l00403"></a>00403 }
<a name="l00404"></a>00404
<a name="l00405"></a>00405
<a name="l00406"></a>00406 } <span class="comment">// namespace geos::geom</span>
<a name="l00407"></a>00407 } <span class="comment">// namespace geos</span>
<a name="l00408"></a>00408
<a name="l00409"></a>00409 <span class="preprocessor">#endif // GEOS_GEOM_BINARYOP_H</span>
</pre></div></div>
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