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1 | // Boost.Geometry |
2 | // QuickBook Example | |
3 | ||
4 | // Copyright (c) 2011-2012 Barend Gehrels, Amsterdam, the Netherlands. | |
5 | // Copyright (c) 2015 Adam Wulkiewicz, Lodz, Poland. | |
6 | ||
7 | // Use, modification and distribution is subject to the Boost Software License, | |
8 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
9 | // http://www.boost.org/LICENSE_1_0.txt) | |
10 | ||
11 | //[multi_polygon | |
12 | //` Declaration and use of the Boost.Geometry model::multi_polygon, modelling the MultiPolygon Concept | |
13 | ||
14 | #include <iostream> | |
15 | #include <boost/geometry.hpp> | |
16 | #include <boost/geometry/geometries/geometries.hpp> | |
17 | ||
18 | namespace bg = boost::geometry; | |
19 | ||
20 | int main() | |
21 | { | |
22 | typedef bg::model::point<double, 2, bg::cs::cartesian> point_t; | |
23 | typedef bg::model::polygon<point_t> polygon_t; /*< Default parameters, clockwise, closed polygon. >*/ | |
24 | typedef bg::model::multi_polygon<polygon_t> mpolygon_t; /*< Clockwise, closed multi_polygon. >*/ | |
25 | ||
26 | mpolygon_t mpoly1; /*< Default-construct a multi_polygon. >*/ | |
27 | ||
28 | #if !defined(BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX) \ | |
29 | && !defined(BOOST_NO_CXX11_HDR_INITIALIZER_LIST) | |
30 | ||
31 | mpolygon_t mpoly2{{{{0.0, 0.0}, {0.0, 5.0}, {5.0, 5.0}, {5.0, 0.0}, {0.0, 0.0}}, | |
32 | {{1.0, 1.0}, {4.0, 1.0}, {4.0, 4.0}, {1.0, 4.0}, {1.0, 1.0}}}, | |
33 | {{{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. >*/ | |
34 | ||
35 | #endif | |
36 | ||
37 | mpoly1.resize(2); /*< Resize a multi_polygon, store two polygons. >*/ | |
38 | ||
39 | bg::append(mpoly1[0].outer(), point_t(0.0, 0.0)); /*< Append point to the exterior ring of the first polygon. >*/ | |
40 | bg::append(mpoly1[0].outer(), point_t(0.0, 5.0)); | |
41 | bg::append(mpoly1[0].outer(), point_t(5.0, 5.0)); | |
42 | bg::append(mpoly1[0].outer(), point_t(5.0, 0.0)); | |
43 | bg::append(mpoly1[0].outer(), point_t(0.0, 0.0)); | |
44 | ||
45 | mpoly1[0].inners().resize(1); /*< Resize a container of interior rings of the first polygon. >*/ | |
46 | bg::append(mpoly1[0].inners()[0], point_t(1.0, 1.0)); /*< Append point to the interior ring of the first polygon. >*/ | |
47 | bg::append(mpoly1[0].inners()[0], point_t(4.0, 1.0)); | |
48 | bg::append(mpoly1[0].inners()[0], point_t(4.0, 4.0)); | |
49 | bg::append(mpoly1[0].inners()[0], point_t(1.0, 4.0)); | |
50 | bg::append(mpoly1[0].inners()[0], point_t(1.0, 1.0)); | |
51 | ||
52 | bg::append(mpoly1[1].outer(), point_t(5.0, 5.0)); /*< Append point to the exterior ring of the second polygon. >*/ | |
53 | bg::append(mpoly1[1].outer(), point_t(5.0, 6.0)); | |
54 | bg::append(mpoly1[1].outer(), point_t(6.0, 6.0)); | |
55 | bg::append(mpoly1[1].outer(), point_t(6.0, 5.0)); | |
56 | bg::append(mpoly1[1].outer(), point_t(5.0, 5.0)); | |
57 | ||
58 | double a = bg::area(mpoly1); | |
59 | ||
60 | std::cout << a << std::endl; | |
61 | ||
62 | return 0; | |
63 | } | |
64 | ||
65 | //] | |
66 | ||
67 | ||
68 | //[multi_polygon_output | |
69 | /*` | |
70 | Output: | |
71 | [pre | |
72 | 17 | |
73 | ] | |
74 | */ | |
75 | //] |