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// Boost.Geometry
// Unit Test
// Copyright (c) 2023 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)
// This unit test is verifying some issues which do not use WKT,
// or are not expressable as WKT (for example by the use of an epsilon)
#include <geometry_test_common.hpp>
#include <boost/geometry/algorithms/area.hpp>
#include <boost/geometry/algorithms/union.hpp>
#include <boost/geometry/geometries/geometries.hpp>
#include <limits>
template <typename T>
void issue_1103()
{
using point_t = bg::model::d2::point_xy<T>;
using polygon_t = bg::model::polygon<point_t, true, true>;
polygon_t poly1;
bg::append(poly1, point_t(1, 1));
bg::append(poly1, point_t(1, std::numeric_limits<T>::epsilon()));
bg::append(poly1, point_t(0, std::numeric_limits<T>::epsilon()));
bg::append(poly1, point_t(0, 1));
bg::append(poly1, point_t(1, 1));
polygon_t poly2;
bg::append(poly2, point_t(1, 0));
bg::append(poly2, point_t(1, -1));
bg::append(poly2, point_t(0, -1));
bg::append(poly2, point_t(0, 0));
bg::append(poly2, point_t(1, 0));
bg::model::multi_polygon<polygon_t> result;
bg::union_(poly1, poly2, result);
// Verify result. Before commit b1bebca the result was empty.
BOOST_CHECK_EQUAL(1, static_cast<int>(boost::size(result)));
BOOST_CHECK_CLOSE(2.0, bg::area(result), 0.0001);
}
int test_main(int, char* [])
{
issue_1103<double>();
issue_1103<long double>();
return 0;
}
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