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 //[transform_with_strategy
11 //` Shows how points can be scaled, translated or rotated
12
13 #include <iostream>
14 #include <boost/geometry.hpp>
15
16
main()17 int main()
18 {
19 namespace trans = boost::geometry::strategy::transform;
20 using boost::geometry::dsv;
21
22 typedef boost::geometry::model::point<double, 2, boost::geometry::cs::cartesian> point_type;
23
24 point_type p1(1.0, 1.0);
25
26 // Translate over (1.5, 1.5)
27 point_type p2;
28 trans::translate_transformer<double, 2, 2> translate(1.5, 1.5);
29 boost::geometry::transform(p1, p2, translate);
30
31 // Scale with factor 3.0
32 point_type p3;
33 trans::scale_transformer<double, 2, 2> scale(3.0);
34 boost::geometry::transform(p1, p3, scale);
35
36 // Rotate with respect to the origin (0,0) over 90 degrees (clockwise)
37 point_type p4;
38 trans::rotate_transformer<boost::geometry::degree, double, 2, 2> rotate(90.0);
39 boost::geometry::transform(p1, p4, rotate);
40
41 std::cout
42 << "p1: " << dsv(p1) << std::endl
43 << "p2: " << dsv(p2) << std::endl
44 << "p3: " << dsv(p3) << std::endl
45 << "p4: " << dsv(p4) << std::endl;
46
47 return 0;
48 }
49
50 //]
51
52
53 //[transform_with_strategy_output
54 /*`
55 Output:
56 [pre
57 p1: (1, 1)
58 p2: (2.5, 2.5)
59 p3: (3, 3)
60 p4: (1, -1)
61 ]
62 */
63 //]
64