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188 lines
7.2 KiB
C++
188 lines
7.2 KiB
C++
// Boost.Geometry (aka GGL, Generic Geometry Library)
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// (Unit) Test
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// Copyright (c) 2018 Barend Gehrels, Amsterdam, the Netherlands.
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// Use, modification and distribution is subject to the Boost Software License,
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// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#include <boost/geometry.hpp>
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#include <geometry_test_common.hpp>
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#include <boost/foreach.hpp>
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#include <iomanip>
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#if defined(TEST_WITH_SVG)
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# include <boost/geometry/io/svg/svg_mapper.hpp>
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#endif
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template <typename MultiPolygon>
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std::string read_from_file(std::string const& filename)
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{
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MultiPolygon mp;
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std::ifstream in(filename.c_str());
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while (in.good())
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{
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std::string line;
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std::getline(in, line);
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if (! line.empty())
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{
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typename boost::range_value<MultiPolygon>::type pol;
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bg::read_wkt(line, pol);
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mp.push_back(pol);
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}
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}
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std::ostringstream out;
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if (! mp.empty())
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{
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out << std::fixed << std::setprecision(19) << bg::wkt(mp);
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}
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BOOST_CHECK(! out.str().empty());
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return out.str();
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}
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template <typename MultiPolygon>
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void test_one(std::string const& caseid, std::string const& wkt,
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double distance_in_meters,
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double expected_area_ratio, double expected_perimeter_ratio,
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std::size_t expected_polygon_count = 0,
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std::size_t expected_interior_count = 0,
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std::size_t expected_point_count = 0)
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{
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boost::ignore_unused(caseid);
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MultiPolygon geometry, simplified;
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bg::read_wkt(wkt, geometry);
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bg::correct(geometry);
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bg::simplify(geometry, simplified, distance_in_meters);
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double const area_ratio = bg::area(simplified) / bg::area(geometry);
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double const perimeter_ratio = bg::perimeter(simplified) / bg::perimeter(geometry);
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BOOST_CHECK_CLOSE(perimeter_ratio, expected_perimeter_ratio, 0.01);
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BOOST_CHECK_CLOSE(area_ratio, expected_area_ratio, 0.01);
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BOOST_CHECK_EQUAL(expected_polygon_count, boost::size(simplified));
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BOOST_CHECK_EQUAL(expected_interior_count, bg::num_interior_rings(simplified));
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BOOST_CHECK_EQUAL(expected_point_count, bg::num_points(simplified));
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// To add new tests, this is convenient and write the test itself:
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// std::cout << "test_one<mp>(\"" << caseid << "\", " << caseid
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// << ", " << distance_in_meters
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// << std::setprecision(6)
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// << ", " << area_ratio
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// << ", " << perimeter_ratio
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// << ", " << boost::size(simplified)
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// << ", " << bg::num_interior_rings(simplified)
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// << ", " << bg::num_points(simplified)
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// << ");"
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// << std::endl;
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#if defined(TEST_WITH_SVG)
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{
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typedef typename boost::range_value<MultiPolygon>::type polygon;
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std::ostringstream filename;
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filename << "simplify_" << caseid << "_" << distance_in_meters << ".svg";
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std::ofstream svg(filename.str().c_str());
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bg::svg_mapper
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<
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typename bg::point_type<MultiPolygon>::type
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> mapper(svg, 1200, 800);
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mapper.add(geometry);
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mapper.add(simplified);
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mapper.map(geometry, "fill-opacity:0.5;fill:rgb(153,204,0);"
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"stroke:rgb(153,204,0);stroke-width:1");
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BOOST_FOREACH(polygon const& pol, simplified)
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{
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mapper.map(pol,
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bg::area(pol) > 0 ? "fill:none;stroke:rgb(255,0,0);stroke-width:1"
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: "fill:none;stroke:rgb(255,0,255);stroke-width:1");
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}
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}
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#endif
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}
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template <bool Clockwise, typename P>
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void test_all()
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{
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typedef bg::model::polygon<P, Clockwise> polygon;
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typedef bg::model::multi_polygon<polygon> mp;
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// The unit test uses countries originally added for buffer unit test
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std::string base_folder = "buffer/data/";
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// Verify for Greece, Italy, Netherlands, Norway and UK
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std::string gr = read_from_file<mp>(base_folder + "gr.wkt");
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std::string it = read_from_file<mp>(base_folder + "it.wkt");
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std::string nl = read_from_file<mp>(base_folder + "nl.wkt");
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std::string no = read_from_file<mp>(base_folder + "no.wkt");
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std::string uk = read_from_file<mp>(base_folder + "uk.wkt");
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// Gradually simplify more aggresively.
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// Area ratio (first) can increase or decrease
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// Perimeter ratio (second) should decrease.
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// Polygons, interior rings, points should decrease
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test_one<mp>("gr", gr, 100, 0.999893, 0.999761, 68, 0, 2523);
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test_one<mp>("gr", gr, 200, 0.999731, 0.998894, 68, 0, 2025);
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test_one<mp>("gr", gr, 500, 0.998969, 0.995778, 68, 0, 1472);
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test_one<mp>("gr", gr, 1000, 0.99721, 0.990555, 68, 0, 1130);
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test_one<mp>("gr", gr, 2000, 0.993177, 0.975566, 65, 0, 839);
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test_one<mp>("gr", gr, 5000, 0.976362, 0.903488, 51, 0, 479);
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test_one<mp>("gr", gr, 10000, 0.954145, 0.770951, 30, 0, 246);
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test_one<mp>("gr", gr, 20000, 0.94543, 0.611661, 11, 0, 101); // Many islands disappear
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test_one<mp>("it", it, 100, 1.00001, 0.999815, 22, 1, 1783);
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test_one<mp>("it", it, 200, 1.00009, 0.999099, 22, 1, 1402);
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test_one<mp>("it", it, 500, 1.00021, 0.996854, 22, 1, 1006);
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test_one<mp>("it", it, 1000, 1.00049, 0.992692, 22, 1, 750);
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test_one<mp>("it", it, 2000, 1.0009, 0.983258, 22, 1, 543);
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test_one<mp>("it", it, 5000, 1.00185, 0.932119, 9, 1, 280);
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test_one<mp>("it", it, 10000, 1.01091, 0.869922, 4, 0, 139); // San Marino disappears
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test_one<mp>("it", it, 20000, 1.00959, 0.8281, 4, 0, 85);
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test_one<mp>("nl", nl, 100, 0.999894, 0.999817, 8, 0, 798);
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test_one<mp>("nl", nl, 200, 0.999641, 0.999096, 8, 0, 633);
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test_one<mp>("nl", nl, 500, 0.999115, 0.996286, 8, 0, 432);
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test_one<mp>("nl", nl, 1000, 0.997689, 0.991921, 8, 0, 328);
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test_one<mp>("nl", nl, 2000, 0.995369, 0.982222, 8, 0, 237);
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test_one<mp>("nl", nl, 5000, 0.991539, 0.9332, 7, 0, 138);
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test_one<mp>("nl", nl, 10000, 0.974408, 0.806818, 4, 0, 71);
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test_one<mp>("nl", nl, 20000, 0.979702, 0.752186, 3, 0, 45);
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test_one<mp>("no", no, 100, 0.999967, 0.999976, 95, 0, 7655);
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test_one<mp>("no", no, 200, 0.999821, 0.999732, 95, 0, 6529);
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test_one<mp>("no", no, 500, 0.999319, 0.998098, 95, 0, 4740);
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test_one<mp>("no", no, 1000, 0.998455, 0.99401, 95, 0, 3525);
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test_one<mp>("no", no, 2000, 0.9963, 0.984416, 91, 0, 2568);
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test_one<mp>("no", no, 5000, 0.988401, 0.957444, 88, 0, 1656);
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test_one<mp>("no", no, 10000, 0.974084, 0.90103, 72, 0, 1070);
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test_one<mp>("no", no, 20000, 0.953065, 0.784675, 41, 0, 603);
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test_one<mp>("uk", uk, 100, 0.999949, 0.99988, 48, 0, 3219);
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test_one<mp>("uk", uk, 200, 0.999854, 0.999289, 48, 0, 2615);
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test_one<mp>("uk", uk, 500, 0.999557, 0.996874, 48, 0, 1880);
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test_one<mp>("uk", uk, 1000, 0.998942, 0.992074, 48, 0, 1384);
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test_one<mp>("uk", uk, 2000, 0.997703, 0.983059, 48, 0, 1028);
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test_one<mp>("uk", uk, 5000, 0.990991, 0.942994, 37, 0, 611);
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test_one<mp>("uk", uk, 10000, 0.988484, 0.871371, 24, 0, 365);
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test_one<mp>("uk", uk, 20000, 0.972889, 0.736474, 12, 0, 191);
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}
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int test_main(int, char* [])
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{
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test_all<true, bg::model::point<double, 2, bg::cs::cartesian> >();
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return 0;
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}
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