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 //[return_envelope
11 //` Shows how to return the envelope of a ring
12
13 #include <iostream>
14
15
16 #include <boost/geometry.hpp>
17 #include <boost/geometry/geometries/box.hpp>
18 #include <boost/geometry/geometries/point_xy.hpp>
19 #include <boost/geometry/geometries/ring.hpp>
20
21 #include <boost/assign.hpp>
22
23 /*<-*/ #include "create_svg_two.hpp" /*->*/
24
main()25 int main()
26 {
27 using namespace boost::assign;
28
29 typedef boost::geometry::model::d2::point_xy<double> point;
30
31 boost::geometry::model::ring<point> ring;
32 ring +=
33 point(4.0, -0.5), point(3.5, 1.0),
34 point(2.0, 1.5), point(3.5, 2.0),
35 point(4.0, 3.5), point(4.5, 2.0),
36 point(6.0, 1.5), point(4.5, 1.0),
37 point(4.0, -0.5);
38
39 typedef boost::geometry::model::box<point> box;
40
41 std::cout
42 << "return_envelope:"
43 << boost::geometry::dsv(boost::geometry::return_envelope<box>(ring))
44 << std::endl;
45
46 /*<-*/ create_svg("return_envelope.svg", ring, boost::geometry::return_envelope<box>(ring)); /*->*/
47 return 0;
48 }
49
50 //]
51
52
53 //[return_envelope_output
54 /*`
55 Output:
56 [pre
57 return_envelope:((2, -0.5), (6, 3.5))
58
59 [$img/algorithms/return_envelope.png]
60 ]
61 */
62 //]
63
64
