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ff67f4a6d0
Add mising #ifdef conditions enabling the example of std::initializer_list support. Remove unneeded semicolons from comments. Add missing QBK import (point_xy).
76 lines
2.7 KiB
C++
76 lines
2.7 KiB
C++
// Boost.Geometry
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// QuickBook Example
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// Copyright (c) 2011-2012 Barend Gehrels, Amsterdam, the Netherlands.
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// Copyright (c) 2015 Adam Wulkiewicz, Lodz, Poland.
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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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//[multi_polygon
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//` Declaration and use of the Boost.Geometry model::multi_polygon, modelling the MultiPolygon Concept
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#include <iostream>
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#include <boost/geometry.hpp>
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#include <boost/geometry/geometries/geometries.hpp>
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namespace bg = boost::geometry;
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int main()
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{
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typedef bg::model::point<double, 2, bg::cs::cartesian> point_t;
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typedef bg::model::polygon<point_t> polygon_t; /*< Default parameters, clockwise, closed polygon. >*/
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typedef bg::model::multi_polygon<polygon_t> mpolygon_t; /*< Clockwise, closed multi_polygon. >*/
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mpolygon_t mpoly1; /*< Default-construct a multi_polygon. >*/
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#if !defined(BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX) \
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&& !defined(BOOST_NO_CXX11_HDR_INITIALIZER_LIST)
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mpolygon_t mpoly2{{{{0.0, 0.0}, {0.0, 5.0}, {5.0, 5.0}, {5.0, 0.0}, {0.0, 0.0}},
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{{1.0, 1.0}, {4.0, 1.0}, {4.0, 4.0}, {1.0, 4.0}, {1.0, 1.0}}},
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{{{5.0, 5.0}, {5.0, 6.0}, {6.0, 6.0}, {6.0, 5.0}, {5.0, 5.0}}}}; /*< Construct a multi_polygon containing two polygons, using C++11 unified initialization syntax. >*/
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#endif
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mpoly1.resize(2); /*< Resize a multi_polygon, store two polygons. >*/
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bg::append(mpoly1[0].outer(), point_t(0.0, 0.0)); /*< Append point to the exterior ring of the first polygon. >*/
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bg::append(mpoly1[0].outer(), point_t(0.0, 5.0));
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bg::append(mpoly1[0].outer(), point_t(5.0, 5.0));
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bg::append(mpoly1[0].outer(), point_t(5.0, 0.0));
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bg::append(mpoly1[0].outer(), point_t(0.0, 0.0));
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mpoly1[0].inners().resize(1); /*< Resize a container of interior rings of the first polygon. >*/
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bg::append(mpoly1[0].inners()[0], point_t(1.0, 1.0)); /*< Append point to the interior ring of the first polygon. >*/
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bg::append(mpoly1[0].inners()[0], point_t(4.0, 1.0));
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bg::append(mpoly1[0].inners()[0], point_t(4.0, 4.0));
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bg::append(mpoly1[0].inners()[0], point_t(1.0, 4.0));
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bg::append(mpoly1[0].inners()[0], point_t(1.0, 1.0));
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bg::append(mpoly1[1].outer(), point_t(5.0, 5.0)); /*< Append point to the exterior ring of the second polygon. >*/
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bg::append(mpoly1[1].outer(), point_t(5.0, 6.0));
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bg::append(mpoly1[1].outer(), point_t(6.0, 6.0));
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bg::append(mpoly1[1].outer(), point_t(6.0, 5.0));
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bg::append(mpoly1[1].outer(), point_t(5.0, 5.0));
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double a = bg::area(mpoly1);
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std::cout << a << std::endl;
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return 0;
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}
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//]
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//[multi_polygon_output
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/*`
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Output:
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[pre
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17
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]
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*/
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//]
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