Hi, I'm trying to run a test that will take the boolean difference of two polygons, but haven't been able to find an explicit difference function. So I've tried instead to get the difference by taking: A & !B (the intersection of A and the negation of B, where negation is done by reversing the winding.) Anyway, when I tried this I got a crash when the winding was reversed on B. I've attached a text with the test. Regards, Brandon // //! Copyright © 2008-2009 //! Brandon Kohn // // Distributed under the Boost Software License, Version 1.0. (See // accompanying file LICENSE_1_0.txt or copy at // http://www.boost.org/LICENSE_1_0.txt) // #ifndef GENERATIVE_GEOMETRY_GGL_REVIEW_TESTBOOLEANS_HPP #define GENERATIVE_GEOMETRY_GGL_REVIEW_TESTBOOLEANS_HPP #pragma once #include <boost/test/unit_test.hpp> #include <boost/test/floating_point_comparison.hpp> ////////////////////////////////////////////////////////////////////////// #include <sstream> #include <fstream> #include <ggl/util/write_dsv.hpp> #include <ggl/extensions/gis/io/wkt/read_wkt.hpp> #include <ggl/extensions/gis/io/wkt/write_wkt.hpp> #include <ggl/geometries/point_xy.hpp> #include <ggl/geometries/box.hpp> #include <ggl/geometries/linear_ring.hpp> #include <ggl/geometries/polygon.hpp> #include <ggl/geometries/geometries.hpp> #include <ggl/algorithms/correct.hpp> #include <ggl/algorithms/intersection.hpp> #include <ggl/algorithms/area.hpp> #include <ggl/algorithms/length.hpp> #include <ggl/algorithms/num_points.hpp> #include <ggl/algorithms/simplify.hpp> #include <ggl/strategies/strategies.hpp> #define TEST_WITH_SVG 1 #if(TEST_WITH_SVG) #include "svg_mapper.hpp" //might need to change this back to your <testutil...path> #endif namespace { template <typename OutputType, typename G1, typename G2> void test_intersection( int caseid, G1 const& g1, G2 const& g2, int expected_count = 0, int expected_point_count = 0, double expected_length_or_area = 0 ) { static const bool is_line = ggl::geometry_id<OutputType>::type::value == 2; std::vector<OutputType> clip; ggl::intersection_inserter<OutputType>(g1, g2, std::back_inserter(clip)); double length_or_area = 0; int n = 0; for (typename std::vector<OutputType>::const_iterator it = clip.begin(); it != clip.end(); ++it) { // instead of specialization we check it run-time here length_or_area += is_line ? ggl::length(*it) : ggl::area(*it); // Simplify to get a correct point-count without duplicate points // (note that overlay might be adapted to avoid duplicates) OutputType simplified; ggl::simplify(*it, simplified, 0.0001); n += ggl::num_points(simplified); //std::cout << std::endl << "case " << caseid << " "; //std::cout << ggl::dsv(*it) << std::endl; } BOOST_CHECK_EQUAL(clip.size(), expected_count); BOOST_CHECK_EQUAL(n, expected_point_count); BOOST_CHECK_CLOSE(length_or_area, expected_length_or_area, 0.001); #if defined(TEST_WITH_SVG) { std::ostringstream filename; filename << "intersection" << caseid << ".svg"; std::ofstream svg(filename.str().c_str()); svg_mapper<typename ggl::point_type<G2>::type> mapper(svg, 500, 500); mapper.add(g1); mapper.add(g2); mapper.map(g1, is_line ? "opacity:0.6;stroke:rgb(0,0,255);stroke-width:5" : "opacity:0.6;fill:rgb(0,0,255);stroke:rgb(0,0,0);stroke-width:1"); mapper.map(g2, "opacity:0.6;fill:rgb(0,255,0);stroke:rgb(0,0,0);stroke-width:1"); for (typename std::vector<OutputType>::const_iterator it = clip.begin(); it != clip.end(); ++it) { mapper.map(*it, "opacity:0.6;fill:none;stroke:rgb(255,0,0);stroke-width:5"); } } #endif } template <typename OutputType, typename G1, typename G2> void test_one( int caseid, std::string const& wkt1, std::string const& wkt2, int expected_count = 0, int expected_point_count = 0, double expected_length_or_area = 0 ) { G1 g1; ggl::read_wkt(wkt1, g1); G2 g2; ggl::read_wkt(wkt2, g2); test_intersection<OutputType>(caseid, g1, g2, expected_count, expected_point_count, expected_length_or_area); } } template <typename Point> void test_ops() { typedef ggl::linestring< Point > linestring; typedef ggl::polygon< Point> polygon; typedef ggl::box< Point > box; std::string p5 = "POLYGON((37.29449462890625 1.7902572154998779,37.000419616699219 1.664225697517395,37.140213012695313 1.3446992635726929,50.974888957147442 -30.277285722290763,57.297810222148939 -37.546793343968417,41.590042114257813 -7.2021245956420898,40.6978759765625 -5.4500408172607422,40.758884429931641 -5.418975830078125,42.577911376953125 -4.4901103973388672,42.577877044677734 -4.4900407791137695,42.699958801269531 -4.4278755187988281,46.523914387974358 -8.5152102535033496,47.585065917176543 -6.1314922196594779,45.389434814453125 -4.5143837928771973,46.296027072709599 -2.4984308554828116,37.43402099609375 1.470055103302002,37.29449462890625 1.7902572154998779))"; //! p7 is p6 in reverse. std::string p6 = "POLYGON((42.399410247802734 1.4956772327423096,42.721500396728516 2.2342472076416016,42.721500396728516 3.6584999561309814,51.20102152843122 7.1738039562841562,51.370888500897557 7.4163459734570729,37.43402099609375 1.470055103302002,37.29449462890625 1.7902572154998779,37.000419616699219 1.664225697517395,37.140213012695313 1.3446992635726929,36.954700469970703 1.2597870826721191,26.472516656201325 -3.5380830513658776,27.069889344709196 -4.2926591211028242,30.501169204711914 -2.3718316555023193,32.708126068115234 -2.3611266613006592,32.708126068115234 -2.3611700534820557,32.708168029785156 -2.3611698150634766,32.718830108642578 -4.3281683921813965,29.135100397190627 -8.9262827849488211,29.619997024536133 -9.5368013381958008,30.339155197143555 -8.9838371276855469,30.670633316040039 -8.8180980682373047,30.896280288696289 -9.1206979751586914,30.207040612748258 -10.275926149505661,30.947774887084961 -11.208560943603516,31.669155120849609 -10.653837203979492,32.000633239746094 -10.488097190856934,32.226280212402344 -10.790698051452637,31.682494778186321 -12.133624901803865,32.274600982666016 -12.879127502441406,32.998821258544922 -12.323249816894531,33.339523315429688 -12.147735595703125,33.566280364990234 -12.450697898864746,33.164891643669634 -14.000060288415174,33.598796844482422 -14.546377182006836,34.328716278076172 -13.992490768432617,34.658355712890625 -13.81736946105957,34.886280059814453 -14.120697975158691,34.634240447128811 -15.85007183479255,34.931102752685547 -16.223842620849609,35.656356811523438 -15.66030216217041,35.963497161865234 -15.476018905639648,37.326129913330078 -17.190576553344727,38.823680877685547 -16.296066284179688,39.966808319091797 -17.625011444091797,40.800632476806641 -17.208097457885742,41.821544647216797 -19.211688995361328,41.988733475572282 -19.945838749437218,57.524304765518266 -37.807195733984784,41.590042114257813 -7.2021245956420898,40.6978759765625 -5.4500408172607422,40.758884429931641 -5.418975830078125,42.577911376953125 -4.4901103973388672,42.577877044677734 -4.4900407791137695,42.699958801269531 -4.4278755187988281,46.559533858616469 -8.435196445683264,47.604561877161387 -6.087697464505224,45.389434814453125 -4.5143837928771973,46.695858001708984 -1.6093428134918213,47.263670054709685 -1.784876824891044,47.830955505371094 -0.69758313894271851,48.43512638981781 -0.81299959072453376,49.071769542946825 0.61489892713413252,43.764598846435547 0.93951499462127686,43.644271850585938 0.96149998903274536,42.399410247802734 1.4956772327423096))"; std::string p7 = "POLYGON((43.644271850585938 0.96149998903274536,43.764598846435547 0.93951499462127686,49.071769542946825 0.61489892713413252,48.43512638981781 -0.81299959072453376,47.830955505371094 -0.69758313894271851,47.263670054709685 -1.784876824891044,46.695858001708984 -1.6093428134918213,45.389434814453125 -4.5143837928771973,47.604561877161387 -6.087697464505224,46.559533858616469 -8.435196445683264,42.699958801269531 -4.4278755187988281,42.577877044677734 -4.4900407791137695,42.577911376953125 -4.4901103973388672,40.758884429931641 -5.418975830078125,40.6978759765625 -5.4500408172607422,41.590042114257813 -7.2021245956420898,57.524304765518266 -37.807195733984784,41.988733475572282 -19.945838749437218,41.821544647216797 -19.211688995361328,40.800632476806641 -17.208097457885742,39.966808319091797 -17.625011444091797,38.823680877685547 -16.296066284179688,37.326129913330078 -17.190576553344727,35.963497161865234 -15.476018905639648,35.656356811523438 -15.66030216217041,34.931102752685547 -16.223842620849609,34.634240447128811 -15.85007183479255,34.886280059814453 -14.120697975158691,34.658355712890625 -13.81736946105957,34.328716278076172 -13.992490768432617,33.598796844482422 -14.546377182006836,33.164891643669634 -14.000060288415174,33.566280364990234 -12.450697898864746,33.339523315429688 -12.147735595703125,32.998821258544922 -12.323249816894531,32.274600982666016 -12.879127502441406,31.682494778186321 -12.133624901803865,32.226280212402344 -10.790698051452637,32.000633239746094 -10.488097190856934,31.669155120849609 -10.653837203979492,30.947774887084961 -11.208560943603516,30.207040612748258 -10.275926149505661,30.896280288696289 -9.1206979751586914,30.670633316040039 -8.8180980682373047,30.339155197143555 -8.9838371276855469,29.619997024536133 -9.5368013381958008,29.135100397190627 -8.9262827849488211,32.718830108642578 -4.3281683921813965,32.708168029785156 -2.3611698150634766,32.708126068115234 -2.3611700534820557,32.708126068115234 -2.3611266613006592,30.501169204711914 -2.3718316555023193,27.069889344709196 -4.2926591211028242,26.472516656201325 -3.5380830513658776,36.954700469970703 1.2597870826721191,37.140213012695313 1.3446992635726929,37.000419616699219 1.664225697517395,37.29449462890625 1.7902572154998779,37.43402099609375 1.470055103302002,51.370888500897557 7.4163459734570729,51.20102152843122 7.1738039562841562,42.721500396728516 3.6584999561309814,42.721500396728516 2.2342472076416016,42.399410247802734 1.4956772327423096,43.644271850585938 0.96149998903274536))"; test_one<polygon, polygon, polygon>(2, p5, p7, 0, 0, 0); } BOOST_AUTO_TEST_CASE( TestBooleanOperations ) { test_ops< ggl::point_xy<double> >(); } #endif