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https://github.com/boostorg/geometry.git
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38adce676e
- replace BOOST_FOREACH - replace Boost.Assign - replace typedef with using - other minor changes
59 lines
1.5 KiB
C++
59 lines
1.5 KiB
C++
// Boost.Geometry (aka GGL, Generic Geometry Library)
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// QuickBook Example
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// Copyright (c) 2011-2024 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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//[clear
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//` Shows how to clear a ring or polygon
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#include <iostream>
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#include <boost/geometry.hpp>
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#include <boost/geometry/geometries/polygon.hpp>
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#include <boost/geometry/geometries/ring.hpp>
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#include <boost/geometry/geometries/adapted/boost_tuple.hpp>
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BOOST_GEOMETRY_REGISTER_BOOST_TUPLE_CS(cs::cartesian)
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int main()
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{
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using point = boost::tuple<float, float>;
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using polygon = boost::geometry::model::polygon<point>;
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using ring = boost::geometry::model::ring<point>;
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// Create a square as exterior ring, with a triangle as interior ring
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polygon poly{{{0, 0}, {0, 10}, {10, 10}, {10, 0}, {0, 0}}, {{{1, 2}, {8, 2}, {4, 6}, {1, 2}}}};
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std::cout << boost::geometry::dsv(poly) << std::endl;
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boost::geometry::clear(poly);
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std::cout << boost::geometry::dsv(poly) << std::endl;
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// Create a triangle
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ring r{{0, 0}, {0, 9}, {8, 8}, {0, 0}};
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std::cout << boost::geometry::dsv(r) << std::endl;
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boost::geometry::clear(r);
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std::cout << boost::geometry::dsv(r) << std::endl;
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return 0;
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}
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//]
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//[clear_output
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/*`
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Output:
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[pre
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(((0, 0), (0, 10), (10, 10), (10, 0), (0, 0)), ((1, 2), (8, 2), (4, 6), (1, 2)))
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(())
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((0, 0), (0, 9), (8, 8), (0, 0))
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()
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]
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*/
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//]
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