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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 | //[polygon | |
12 | //` Declaration and use of the Boost.Geometry model::polygon, modelling the Polygon 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 | ||
25 | polygon_t poly1; /*< Default-construct a polygon. >*/ | |
26 | ||
27 | #if !defined(BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX) \ | |
28 | && !defined(BOOST_NO_CXX11_HDR_INITIALIZER_LIST) | |
29 | ||
30 | polygon_t polygon2{{{0.0, 0.0}, {0.0, 5.0}, {5.0, 5.0}, {5.0, 0.0}, {0.0, 0.0}}, | |
31 | {{1.0, 1.0}, {4.0, 1.0}, {4.0, 4.0}, {1.0, 4.0}, {1.0, 1.0}}}; /*< Construct a polygon containing an exterior and interior ring, using C++11 unified initialization syntax. >*/ | |
32 | ||
33 | #endif | |
34 | ||
35 | bg::append(poly1.outer(), point_t(0.0, 0.0)); /*< Append point to the exterior ring. >*/ | |
36 | bg::append(poly1.outer(), point_t(0.0, 5.0)); | |
37 | bg::append(poly1.outer(), point_t(5.0, 5.0)); | |
38 | bg::append(poly1.outer(), point_t(5.0, 0.0)); | |
39 | bg::append(poly1.outer(), point_t(0.0, 0.0)); | |
40 | ||
41 | poly1.inners().resize(1); /*< Resize a container of interior rings. >*/ | |
42 | bg::append(poly1.inners()[0], point_t(1.0, 1.0)); /*< Append point to the interior ring. >*/ | |
43 | bg::append(poly1.inners()[0], point_t(4.0, 1.0)); | |
44 | bg::append(poly1.inners()[0], point_t(4.0, 4.0)); | |
45 | bg::append(poly1.inners()[0], point_t(1.0, 4.0)); | |
46 | bg::append(poly1.inners()[0], point_t(1.0, 1.0)); | |
47 | ||
48 | double a = bg::area(poly1); | |
49 | ||
50 | std::cout << a << std::endl; | |
51 | ||
52 | return 0; | |
53 | } | |
54 | ||
55 | //] | |
56 | ||
57 | ||
58 | //[polygon_output | |
59 | /*` | |
60 | Output: | |
61 | [pre | |
62 | 16 | |
63 | ] | |
64 | */ | |
65 | //] |