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48 lines
1.2 KiB
C++
48 lines
1.2 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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//[num_geometries
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//` Get the number of geometries making up a multi-geometry
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#include <iostream>
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#include <boost/geometry/geometry.hpp>
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#include <boost/geometry/multi/multi.hpp>
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#include <boost/geometry/geometries/geometries.hpp>
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#include <boost/geometry/multi/geometries/multi_polygon.hpp>
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#include <boost/geometry/domains/gis/io/wkt/wkt.hpp>
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int main()
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{
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boost::geometry::model::multi_polygon
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<
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boost::geometry::model::polygon
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<
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boost::geometry::model::d2::point_xy<double>
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>
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> mp;
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boost::geometry::read_wkt("MULTIPOLYGON(((0 0,0 10,10 0,0 0),(1 1,1 9,9 1,1 1)),((10 10,10 7,7 10,10 10)))", mp);
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std::cout << "Number of geometries: " << boost::geometry::num_geometries(mp) << std::endl;
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return 0;
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}
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//]
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//[num_geometries_output
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/*`
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Output:
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[pre
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Number of geometries: 2
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]
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*/
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//]
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