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96 lines
3.0 KiB
C++
96 lines
3.0 KiB
C++
// Boost.Geometry (aka GGL, Generic Geometry Library) test file
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//
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// Copyright Barend Gehrels 2007-2009, Geodan, 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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#ifndef BOOST_GEOMETRY_TEST_SIMPLIFY_HPP
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#define BOOST_GEOMETRY_TEST_SIMPLIFY_HPP
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// Test-functionality, shared between single and multi tests
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#include <ggl_test_common.hpp>
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#include <boost/geometry/algorithms/simplify.hpp>
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#include <boost/geometry/algorithms/distance.hpp>
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#include <boost/geometry/strategies/strategies.hpp>
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#include <boost/geometry/extensions/gis/io/wkt/wkt.hpp>
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template <typename Tag, typename Geometry>
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struct test_inserter
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{
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static void apply(Geometry& , std::string const& , double )
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{}
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};
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template <typename Geometry>
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struct test_inserter<boost::geometry::linestring_tag, Geometry>
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{
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static void apply(Geometry& geometry, std::string const& expected, double distance)
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{
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Geometry simplified;
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boost::geometry::simplify_inserter(geometry,
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std::back_inserter(simplified), distance);
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std::ostringstream out;
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out << boost::geometry::wkt(simplified);
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BOOST_CHECK_EQUAL(out.str(), expected);
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}
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};
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template <typename Geometry>
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void test_geometry(std::string const& wkt, std::string const& expected, double distance)
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{
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Geometry geometry, simplified;
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// Generate polygon using only integer coordinates and obvious results
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// Polygon is a hexagon, having one extra point (2,1) on a line which should be filtered out.
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boost::geometry::read_wkt(wkt, geometry);
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boost::geometry::simplify(geometry, simplified, distance);
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{
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std::ostringstream out;
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out << boost::geometry::wkt(simplified);
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BOOST_CHECK_MESSAGE(out.str() == expected,
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"simplify: " << boost::geometry::wkt(geometry)
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<< " expected " << expected
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<< " got " << boost::geometry::wkt(simplified));
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}
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// Check using user-specified strategy
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typedef typename boost::geometry::point_type<Geometry>::type point_type;
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typedef typename boost::geometry::cs_tag<point_type>::type tag;
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typedef boost::geometry::strategy::distance::projected_point
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<
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point_type,
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point_type
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> strategy;
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typedef boost::geometry::strategy::simplify::douglas_peucker
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<
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point_type,
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strategy
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> simplify_strategy_type;
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BOOST_CONCEPT_ASSERT( (boost::geometry::concept::SimplifyStrategy<simplify_strategy_type>) );
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boost::geometry::simplify(geometry, simplified, distance, simplify_strategy_type());
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{
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std::ostringstream out;
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out << boost::geometry::wkt(simplified);
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BOOST_CHECK_EQUAL(out.str(), expected);
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}
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// Check inserter (if applicable)
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test_inserter
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<
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typename boost::geometry::tag<Geometry>::type,
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Geometry
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>::apply(geometry, expected, distance);
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}
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#endif
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