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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 | //[for_each_point_const | |
11 | //` Sample using for_each_point, using a function to list coordinates | |
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 | ||
20 | template <typename Point> | |
21 | void list_coordinates(Point const& p) | |
22 | { | |
23 | using boost::geometry::get; | |
24 | std::cout << "x = " << get<0>(p) << " y = " << get<1>(p) << std::endl; | |
25 | } | |
26 | ||
27 | int main() | |
28 | { | |
29 | typedef boost::geometry::model::d2::point_xy<double> point; | |
30 | boost::geometry::model::polygon<point> poly; | |
31 | boost::geometry::read_wkt("POLYGON((0 0,0 4,4 0,0 0))", poly); | |
32 | boost::geometry::for_each_point(poly, list_coordinates<point>); | |
33 | return 0; | |
34 | } | |
35 | ||
36 | //] | |
37 | ||
38 | ||
39 | //[for_each_point_const_output | |
40 | /*` | |
41 | Output: | |
42 | [pre | |
43 | x = 0 y = 0 | |
44 | x = 0 y = 4 | |
45 | x = 4 y = 0 | |
46 | x = 0 y = 0 | |
47 | ] | |
48 | */ | |
49 | //] |