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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 | //[area | |
11 | //` Calculate the area of a polygon | |
12 | ||
13 | #include <iostream> | |
14 | ||
15 | #include <boost/geometry.hpp> | |
16 | #include <boost/geometry/geometries/point_xy.hpp> | |
17 | #include <boost/geometry/geometries/polygon.hpp> | |
18 | ||
19 | namespace bg = boost::geometry; /*< Convenient namespace alias >*/ | |
20 | ||
21 | int main() | |
22 | { | |
23 | // Calculate the area of a cartesian polygon | |
24 | bg::model::polygon<bg::model::d2::point_xy<double> > poly; | |
25 | bg::read_wkt("POLYGON((0 0,0 7,4 2,2 0,0 0))", poly); | |
26 | double area = bg::area(poly); | |
27 | std::cout << "Area: " << area << std::endl; | |
28 | ||
29 | // Calculate the area of a spherical equatorial polygon | |
30 | bg::model::polygon<bg::model::point<float, 2, bg::cs::spherical_equatorial<bg::degree> > > sph_poly; | |
31 | bg::read_wkt("POLYGON((0 0,0 45,45 0,0 0))", sph_poly); | |
32 | area = bg::area(sph_poly); | |
33 | std::cout << "Area: " << area << std::endl; | |
34 | ||
35 | return 0; | |
36 | } | |
37 | ||
38 | //] | |
39 | ||
40 | ||
41 | //[area_output | |
42 | /*` | |
43 | Output: | |
44 | [pre | |
45 | Area: 16 | |
46 | Area: 0.339837 | |
47 | ] | |
48 | */ | |
49 | //] |