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66 lines
1.6 KiB
C++
66 lines
1.6 KiB
C++
// Boost.Geometry (aka GGL, Generic Geometry Library)
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// QuickBook Example
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// Copyright (c) 2011 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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//[union
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//` Shows how to get a united geometry of two polygons
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#include <iostream>
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#include <vector>
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#include <boost/geometry.hpp>
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#include <boost/geometry/geometries/geometries.hpp>
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#include <boost/geometry/domains/gis/io/wkt/wkt.hpp>
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#include <boost/foreach.hpp>
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/*<-*/ #include "create_svg_overlay.hpp" /*->*/
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int main()
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{
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typedef boost::geometry::model::polygon<boost::geometry::model::d2::point_xy<double> > polygon;
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polygon green, blue;
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boost::geometry::read_wkt(
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"POLYGON((2 1.3,2.4 1.7,2.8 1.8,3.4 1.2,3.7 1.6,3.4 2,4.1 3,5.3 2.6,5.4 1.2,4.9 0.8,2.9 0.7,2 1.3)"
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"(4.0 2.0, 4.2 1.4, 4.8 1.9, 4.4 2.2, 4.0 2.0))", green);
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boost::geometry::read_wkt(
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"POLYGON((4.0 -0.5 , 3.5 1.0 , 2.0 1.5 , 3.5 2.0 , 4.0 3.5 , 4.5 2.0 , 6.0 1.5 , 4.5 1.0 , 4.0 -0.5))", blue);
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std::vector<polygon> output;
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boost::geometry::union_(green, blue, output);
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int i = 0;
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std::cout << "green || blue:" << std::endl;
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BOOST_FOREACH(polygon const& p, output)
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{
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std::cout << i++ << ": " << boost::geometry::area(p) << std::endl;
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}
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/*<-*/ create_svg("union.svg", green, blue, output); /*->*/
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return 0;
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}
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//]
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//[union_output
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/*`
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Output:
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[pre
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green || blue:
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0: 5.64795
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[$img/algorithms/union.png]
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]
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*/
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//]
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