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
main()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 //]
66