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63 lines
1.6 KiB
C++
63 lines
1.6 KiB
C++
// Boost.Geometry (aka GGL, Generic Geometry Library)
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//
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// Copyright Barend Gehrels 2011, 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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//
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// Quickbook Example
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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/geometry.hpp>
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#include <boost/geometry/geometries/geometries.hpp>
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#include <boost/geometry/geometries/adapted/tuple_cartesian.hpp>
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#include <boost/assign.hpp>
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int main()
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{
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using boost::assign::tuple_list_of;
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typedef boost::tuple<float, float> point;
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typedef boost::geometry::model::polygon<point> polygon;
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typedef boost::geometry::model::ring<point> ring;
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polygon poly;
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// Fill the polygon (using its own methods + Boost.Assign)
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poly.outer() = tuple_list_of(0, 0)(0, 10)(11, 11)(0, 0);
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poly.inners().push_back(tuple_list_of(0, 0)(0, 10)(11, 11)(0, 0));
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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 ring using Boost.Assign
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ring r = tuple_list_of(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), (11, 11), (0, 0)), ((0, 0), (0, 10), (11, 11), (0, 0)))
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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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