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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 | //[union | |
11 | //` Shows how to get a united geometry of two polygons | |
12 | ||
13 | #include <iostream> | |
14 | #include <vector> | |
15 | ||
16 | #include <boost/geometry.hpp> | |
17 | #include <boost/geometry/geometries/point_xy.hpp> | |
18 | #include <boost/geometry/geometries/polygon.hpp> | |
19 | ||
20 | #include <boost/foreach.hpp> | |
21 | /*<-*/ #include "create_svg_overlay.hpp" /*->*/ | |
22 | ||
23 | int main() | |
24 | { | |
25 | typedef boost::geometry::model::polygon<boost::geometry::model::d2::point_xy<double> > polygon; | |
26 | ||
27 | polygon green, blue; | |
28 | ||
29 | boost::geometry::read_wkt( | |
30 | "POLYGON((2 1.3,2.4 1.7,2.8 1.8,3.4 1.2,3.7 1.6,3.4 2,4.1 3,5.3 2.6,5.4 1.2,4.9 0.8,2.9 0.7,2 1.3)" | |
31 | "(4.0 2.0, 4.2 1.4, 4.8 1.9, 4.4 2.2, 4.0 2.0))", green); | |
32 | ||
33 | boost::geometry::read_wkt( | |
34 | "POLYGON((4.0 -0.5 , 3.5 1.0 , 2.0 1.5 , 3.5 2.0 , 4.0 3.5 , 4.5 2.0 , 6.0 1.5 , 4.5 1.0 , 4.0 -0.5))", blue); | |
35 | ||
36 | std::vector<polygon> output; | |
37 | boost::geometry::union_(green, blue, output); | |
38 | ||
39 | int i = 0; | |
40 | std::cout << "green || blue:" << std::endl; | |
41 | BOOST_FOREACH(polygon const& p, output) | |
42 | { | |
43 | std::cout << i++ << ": " << boost::geometry::area(p) << std::endl; | |
44 | } | |
45 | ||
46 | /*<-*/ create_svg("union.svg", green, blue, output); /*->*/ | |
47 | return 0; | |
48 | } | |
49 | ||
50 | //] | |
51 | ||
52 | ||
53 | //[union_output | |
54 | /*` | |
55 | Output: | |
56 | [pre | |
57 | green || blue: | |
58 | 0: 5.64795 | |
59 | ||
60 | [$img/algorithms/union.png] | |
61 | ||
62 | ] | |
63 | */ | |
64 | //] | |
65 |