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// Boost.Geometry (aka GGL, Generic Geometry Library)
// (Unit) Test
// Copyright (c) 2018 Barend Gehrels, Amsterdam, the Netherlands.
// This file was modified by Oracle on 2021.
// Modifications copyright (c) 2021, Oracle and/or its affiliates.
// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
// 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 <iomanip>
#include <geometry_test_common.hpp>
#include <boost/geometry/algorithms/correct.hpp>
#include <boost/geometry/algorithms/simplify.hpp>
#include <boost/geometry/geometries/geometries.hpp>
#include <boost/geometry/io/wkt/read.hpp>
#include <boost/geometry/io/wkt/write.hpp>
#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");
for (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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