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1 | // Boost.Geometry (aka GGL, Generic Geometry Library) |
2 | // QuickBook Example | |
3 | ||
4 | // Copyright (c) 2011-2012 Barend Gehrels, Amsterdam, the Netherlands. | |
5 | ||
6 | // Use, modification and distribution is subject to the Boost Software License, | |
7 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
8 | // http://www.boost.org/LICENSE_1_0.txt) | |
9 | ||
10 | //[register_ring | |
11 | //` Show the use of the macro BOOST_GEOMETRY_REGISTER_RING | |
12 | ||
13 | #include <iostream> | |
14 | ||
15 | #include <boost/geometry.hpp> | |
16 | #include <boost/geometry/geometries/point_xy.hpp> | |
17 | #include <boost/geometry/geometries/register/ring.hpp> | |
18 | ||
19 | typedef boost::geometry::model::d2::point_xy<double> point_2d; | |
20 | ||
21 | BOOST_GEOMETRY_REGISTER_RING(std::vector<point_2d>) /*< The magic: adapt vector to Boost.Geometry Ring Concept >*/ | |
22 | ||
23 | int main() | |
24 | { | |
25 | // Normal usage of std:: | |
26 | std::vector<point_2d> ring; | |
27 | ring.push_back(point_2d(1, 1)); | |
28 | ring.push_back(point_2d(2, 2)); | |
29 | ring.push_back(point_2d(2, 1)); | |
30 | ||
31 | ||
32 | // Usage of Boost.Geometry | |
33 | boost::geometry::correct(ring); | |
34 | std::cout << "Area: " << boost::geometry::area(ring) << std::endl; | |
35 | std::cout << "WKT: " << boost::geometry::wkt(ring) << std::endl; | |
36 | ||
37 | return 0; | |
38 | } | |
39 | ||
40 | //] | |
41 | ||
42 | ||
43 | //[register_ring_output | |
44 | /*` | |
45 | Output: | |
46 | [pre | |
47 | Area: 0.5 | |
48 | WKT: POLYGON((1 1,2 2,2 1,1 1)) | |
49 | ] | |
50 | */ | |
51 | //] |