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- // Boost.Geometry (aka GGL, Generic Geometry Library)
- // (Unit) Test
- // Copyright (c) 2018 Barend Gehrels, Amsterdam, the Netherlands.
- // Use, modification and distribution is subject to 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)
- #include <boost/geometry.hpp>
- #include <geometry_test_common.hpp>
- #include <boost/foreach.hpp>
- #include <iomanip>
- #if defined(TEST_WITH_SVG)
- # include <boost/geometry/io/svg/svg_mapper.hpp>
- #endif
- template <typename MultiPolygon>
- std::string read_from_file(std::string const& filename)
- {
- MultiPolygon mp;
- std::ifstream in(filename.c_str());
- while (in.good())
- {
- std::string line;
- std::getline(in, line);
- if (! line.empty())
- {
- typename boost::range_value<MultiPolygon>::type pol;
- bg::read_wkt(line, pol);
- mp.push_back(pol);
- }
- }
- std::ostringstream out;
- if (! mp.empty())
- {
- out << std::fixed << std::setprecision(19) << bg::wkt(mp);
- }
- BOOST_CHECK(! out.str().empty());
- return out.str();
- }
- template <typename MultiPolygon>
- void test_one(std::string const& caseid, std::string const& wkt,
- double distance_in_meters,
- double expected_area_ratio, double expected_perimeter_ratio,
- std::size_t expected_polygon_count = 0,
- std::size_t expected_interior_count = 0,
- std::size_t expected_point_count = 0)
- {
- boost::ignore_unused(caseid);
- MultiPolygon geometry, simplified;
- bg::read_wkt(wkt, geometry);
- bg::correct(geometry);
- bg::simplify(geometry, simplified, distance_in_meters);
- double const area_ratio = bg::area(simplified) / bg::area(geometry);
- double const perimeter_ratio = bg::perimeter(simplified) / bg::perimeter(geometry);
- BOOST_CHECK_CLOSE(perimeter_ratio, expected_perimeter_ratio, 0.01);
- BOOST_CHECK_CLOSE(area_ratio, expected_area_ratio, 0.01);
- BOOST_CHECK_EQUAL(expected_polygon_count, boost::size(simplified));
- BOOST_CHECK_EQUAL(expected_interior_count, bg::num_interior_rings(simplified));
- BOOST_CHECK_EQUAL(expected_point_count, bg::num_points(simplified));
- // To add new tests, this is convenient and write the test itself:
- // std::cout << "test_one<mp>(\"" << caseid << "\", " << caseid
- // << ", " << distance_in_meters
- // << std::setprecision(6)
- // << ", " << area_ratio
- // << ", " << perimeter_ratio
- // << ", " << boost::size(simplified)
- // << ", " << bg::num_interior_rings(simplified)
- // << ", " << bg::num_points(simplified)
- // << ");"
- // << std::endl;
- #if defined(TEST_WITH_SVG)
- {
- typedef typename boost::range_value<MultiPolygon>::type polygon;
- std::ostringstream filename;
- filename << "simplify_" << caseid << "_" << distance_in_meters << ".svg";
- std::ofstream svg(filename.str().c_str());
- bg::svg_mapper
- <
- typename bg::point_type<MultiPolygon>::type
- > mapper(svg, 1200, 800);
- mapper.add(geometry);
- mapper.add(simplified);
- mapper.map(geometry, "fill-opacity:0.5;fill:rgb(153,204,0);"
- "stroke:rgb(153,204,0);stroke-width:1");
- BOOST_FOREACH(polygon const& pol, simplified)
- {
- mapper.map(pol,
- bg::area(pol) > 0 ? "fill:none;stroke:rgb(255,0,0);stroke-width:1"
- : "fill:none;stroke:rgb(255,0,255);stroke-width:1");
- }
- }
- #endif
- }
- template <bool Clockwise, typename P>
- void test_all()
- {
- typedef bg::model::polygon<P, Clockwise> polygon;
- typedef bg::model::multi_polygon<polygon> mp;
- // The unit test uses countries originally added for buffer unit test
- std::string base_folder = "buffer/data/";
- // Verify for Greece, Italy, Netherlands, Norway and UK
- std::string gr = read_from_file<mp>(base_folder + "gr.wkt");
- std::string it = read_from_file<mp>(base_folder + "it.wkt");
- std::string nl = read_from_file<mp>(base_folder + "nl.wkt");
- std::string no = read_from_file<mp>(base_folder + "no.wkt");
- std::string uk = read_from_file<mp>(base_folder + "uk.wkt");
- // Gradually simplify more aggresively.
- // Area ratio (first) can increase or decrease
- // Perimeter ratio (second) should decrease.
- // Polygons, interior rings, points should decrease
- test_one<mp>("gr", gr, 100, 0.999905, 0.999758, 68, 0, 2520);
- test_one<mp>("gr", gr, 200, 0.999773, 0.998865, 68, 0, 2019);
- test_one<mp>("gr", gr, 500, 0.999026, 0.995931, 68, 0, 1468);
- test_one<mp>("gr", gr, 1000, 0.997782, 0.991475, 68, 0, 1132);
- test_one<mp>("gr", gr, 2000, 0.994448, 0.9793, 65, 0, 854);
- test_one<mp>("gr", gr, 5000, 0.979743, 0.910266, 50, 0, 471);
- test_one<mp>("gr", gr, 10000, 0.968349, 0.778863, 28, 0, 245);
- test_one<mp>("gr", gr, 20000, 0.961943, 0.607009, 10, 0, 97); // Many islands disappear
- test_one<mp>("it", it, 100, 1.00001, 0.999813, 22, 1, 1783);
- test_one<mp>("it", it, 200, 1.00009, 0.9991, 22, 1, 1406);
- test_one<mp>("it", it, 500, 1.00019, 0.996848, 22, 1, 1011);
- test_one<mp>("it", it, 1000, 1.00041, 0.99294, 22, 1, 749);
- test_one<mp>("it", it, 2000, 1.00086, 0.985144, 22, 1, 546);
- test_one<mp>("it", it, 5000, 1.00147, 0.93927, 11, 1, 283);
- test_one<mp>("it", it, 10000, 1.01089, 0.882198, 4, 1, 153);
- test_one<mp>("it", it, 20000, 1.00893, 0.828774, 4, 0, 86); // San Marino disappears
- test_one<mp>("nl", nl, 100, 0.999896, 0.999804, 8, 0, 789);
- test_one<mp>("nl", nl, 200, 0.999733, 0.999095, 8, 0, 633);
- test_one<mp>("nl", nl, 500, 0.999423, 0.996313, 8, 0, 436);
- test_one<mp>("nl", nl, 1000, 0.997893, 0.991951, 8, 0, 331);
- test_one<mp>("nl", nl, 2000, 0.996129, 0.981998, 8, 0, 234);
- test_one<mp>("nl", nl, 5000, 0.986128, 0.896, 5, 0, 132);
- test_one<mp>("nl", nl, 10000, 0.973917, 0.832522, 4, 0, 75);
- test_one<mp>("nl", nl, 20000, 0.970675, 0.739275, 3, 0, 40);
- test_one<mp>("no", no, 100, 0.999966, 0.999975, 95, 0, 7650);
- test_one<mp>("no", no, 200, 0.999812, 0.999731, 95, 0, 6518);
- test_one<mp>("no", no, 500, 0.99929, 0.998092, 95, 0, 4728);
- test_one<mp>("no", no, 1000, 0.998473, 0.994075, 95, 0, 3524);
- test_one<mp>("no", no, 2000, 0.996674, 0.985863, 92, 0, 2576);
- test_one<mp>("no", no, 5000, 0.99098, 0.965689, 87, 0, 1667);
- test_one<mp>("no", no, 10000, 0.978207, 0.906525, 69, 0, 1059);
- test_one<mp>("no", no, 20000, 0.955223, 0.786546, 38, 0, 593);
- test_one<mp>("uk", uk, 100, 0.999942, 0.999878, 48, 0, 3208);
- test_one<mp>("uk", uk, 200, 0.999843, 0.999291, 48, 0, 2615);
- test_one<mp>("uk", uk, 500, 0.999522, 0.996888, 48, 0, 1885);
- test_one<mp>("uk", uk, 1000, 0.999027, 0.992306, 48, 0, 1396);
- test_one<mp>("uk", uk, 2000, 0.998074, 0.983839, 47, 0, 1032);
- test_one<mp>("uk", uk, 5000, 0.991901, 0.943496, 35, 0, 611);
- test_one<mp>("uk", uk, 10000, 0.990039, 0.871969, 23, 0, 359);
- test_one<mp>("uk", uk, 20000, 0.979171, 0.737577, 11, 0, 193);
- }
- int test_main(int, char* [])
- {
- test_all<true, bg::model::point<double, 2, bg::cs::cartesian> >();
- return 0;
- }
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