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// Boost.Geometry (aka GGL, Generic Geometry Library)
// Unit Test
// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
// This file was modified by Oracle on 2021-2023.
// Modifications copyright (c) 2021-2023 Oracle and/or its affiliates.
// Contributed and/or modified by Vissarion Fysikopoulos, on behalf of Oracle
// 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)
#ifndef BOOST_GEOMETRY_TEST_SIMPLIFY_HPP
#define BOOST_GEOMETRY_TEST_SIMPLIFY_HPP
// Test-functionality, shared between single and multi tests
#include <iomanip>
#include <sstream>
#include <geometry_test_common.hpp>
#include <boost/geometry/algorithms/correct_closure.hpp>
#include <boost/geometry/algorithms/equals.hpp>
#include <boost/geometry/algorithms/simplify.hpp>
#include <boost/geometry/algorithms/distance.hpp>
#include <boost/geometry/geometries/geometry_collection.hpp>
#include <boost/geometry/strategies/concepts/simplify_concept.hpp>
#include <boost/geometry/strategies/strategies.hpp>
#include <boost/geometry/io/wkt/wkt.hpp>
#include <boost/variant/variant.hpp>
template <typename Geometry, typename Tag = typename bg::tag<Geometry>::type>
struct boost_variant_type
{
using type = boost::variant<Geometry, typename bg::point_type<Geometry>::type>;
};
template <typename Geometry>
struct boost_variant_type<Geometry, bg::point_tag>
{
using type = boost::variant<Geometry>;
};
template
<
typename GeometryForTag,
typename Tag = typename bg::tag<GeometryForTag>::type
>
struct test_equality
{
template <typename Geometry, typename Expected>
static void apply(Geometry const& geometry, Expected const& expected)
{
// Verify both spatially equal AND number of points, because several
// of the tests only check explicitly on collinear points being
// simplified away
bool const result
= bg::equals(geometry, expected)
&& bg::num_points(geometry) == bg::num_points(expected);
BOOST_CHECK_MESSAGE(result,
" result: " << bg::wkt(geometry) << " " << bg::area(geometry)
<< " expected: " << bg::wkt(expected) << " " << bg::area(expected));
}
};
// Linestring does NOT yet have "geometry::equals" implemented
// Until then, WKT's are compared (which is acceptable for linestrings, but not
// for polygons, because simplify might rotate them)
template <typename GeometryForTag>
struct test_equality<GeometryForTag, bg::linestring_tag>
{
template <typename Geometry, typename Expected>
static void apply(Geometry const& geometry, Expected const& expected)
{
std::ostringstream out1, out2;
out1 << bg::wkt(geometry);
out2 << bg::wkt(expected);
BOOST_CHECK_EQUAL(out1.str(), out2.str());
}
};
template <typename Tag>
struct test_inserter
{
template <typename Geometry, typename Expected>
static void apply(Geometry& , Expected const& , double )
{}
};
template <>
struct test_inserter<bg::linestring_tag>
{
template <typename Geometry, typename Expected, typename DistanceMeasure>
static void apply(Geometry& geometry,
Expected const& expected,
DistanceMeasure const& distance)
{
{
Geometry simplified;
bg::detail::simplify::simplify_insert(geometry,
std::back_inserter(simplified), distance);
test_equality<Geometry>::apply(simplified, expected);
}
}
};
template <typename Geometry, typename Expected, typename DistanceMeasure>
void check_geometry(Geometry const& geometry,
Expected const& expected,
DistanceMeasure const& distance)
{
Geometry simplified;
bg::simplify(geometry, simplified, distance);
test_equality<Expected>::apply(simplified, expected);
}
template <typename Geometry, typename Expected, typename Strategy, typename DistanceMeasure>
void check_geometry(Geometry const& geometry,
Expected const& expected,
DistanceMeasure const& distance,
Strategy const& strategy)
{
Geometry simplified;
bg::simplify(geometry, simplified, distance, strategy);
test_equality<Expected>::apply(simplified, expected);
}
template <typename Geometry, typename DistanceMeasure>
void check_geometry_with_area(Geometry const& geometry,
double expected_area,
DistanceMeasure const& distance)
{
Geometry simplified;
bg::simplify(geometry, simplified, distance);
BOOST_CHECK_CLOSE(bg::area(simplified), expected_area, 0.01);
}
template <typename Geometry, typename DistanceMeasure>
void test_geometry(std::string const& wkt,
std::string const& expected_wkt,
DistanceMeasure distance)
{
typedef typename bg::point_type<Geometry>::type point_type;
Geometry geometry, expected;
bg::read_wkt(wkt, geometry);
bg::read_wkt(expected_wkt, expected);
using variant_t = typename boost_variant_type<Geometry>::type;
variant_t v(geometry);
// Define default strategy for testing
typedef bg::strategy::simplify::douglas_peucker
<
typename bg::point_type<Geometry>::type,
bg::strategy::distance::projected_point<double>
> dp;
BOOST_CONCEPT_ASSERT((bg::concepts::SimplifyStrategy<dp, point_type>));
check_geometry(geometry, expected, distance);
check_geometry(v, expected, distance);
check_geometry(geometry, expected, distance, dp());
check_geometry(v, expected, distance, dp());
// For now check GC here because it's not supported by equals()
{
using gc_t = bg::model::geometry_collection<variant_t>;
gc_t gc{v};
gc_t gc_simplified;
bg::simplify(gc, gc_simplified, distance);
bg::detail::visit_breadth_first([&](auto const& g)
{
test_equality<Geometry>::apply(g, expected);
return false;
}, gc_simplified);
}
// Check inserter (if applicable)
test_inserter
<
typename bg::tag<Geometry>::type
>::apply(geometry, expected, distance);
}
template <typename Geometry, typename Strategy, typename DistanceMeasure>
void test_geometry(std::string const& wkt,
std::string const& expected_wkt,
DistanceMeasure const& distance,
Strategy const& strategy)
{
Geometry geometry, expected;
bg::read_wkt(wkt, geometry);
bg::read_wkt(expected_wkt, expected);
bg::correct_closure(geometry);
bg::correct_closure(expected);
typename boost_variant_type<Geometry>::type v(geometry);
BOOST_CONCEPT_ASSERT( (bg::concepts::SimplifyStrategy<Strategy,
typename bg::point_type<Geometry>::type>) );
check_geometry(geometry, expected, distance, strategy);
check_geometry(v, expected, distance, strategy);
}
template <typename Geometry, typename DistanceMeasure>
void test_geometry(std::string const& wkt,
double expected_area,
DistanceMeasure const& distance)
{
Geometry geometry;
bg::read_wkt(wkt, geometry);
bg::correct_closure(geometry);
check_geometry_with_area(geometry, expected_area, distance);
}
#endif
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