ceph/src/boost/libs/geometry/doc/src/examples/algorithms/envelope.cpp

   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 //[envelope
  11 //` Shows how to calculate the bounding box of a polygon
  12
  13 #include <iostream>
  14
  15 #include <boost/geometry.hpp>
  16 #include <boost/geometry/geometries/box.hpp>
  17 #include <boost/geometry/geometries/point_xy.hpp>
  18 #include <boost/geometry/geometries/polygon.hpp>
  19 /*<-*/ #include "create_svg_two.hpp" /*->*/
  20
  21 int main()
  22 {
  23     typedef boost::geometry::model::d2::point_xy<double> point;
  24
  25     boost::geometry::model::polygon<point> polygon;
  26
  27     boost::geometry::read_wkt(
  28         "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)"
  29             "(4.0 2.0, 4.2 1.4, 4.8 1.9, 4.4 2.2, 4.0 2.0))", polygon);
  30
  31     boost::geometry::model::box<point> box;
  32     boost::geometry::envelope(polygon, box);
  33
  34     std::cout << "envelope:" << boost::geometry::dsv(box) << std::endl;
  35
  36     /*<-*/ create_svg("envelope.svg", polygon, box); /*->*/
  37     return 0;
  38 }
  39
  40 //]
  41
  42
  43 //[envelope_output
  44 /*`
  45 Output:
  46 [pre
  47 envelope:((2, 0.7), (5.4, 3))
  48
  49 [$img/algorithms/envelope.png]
  50 ]
  51 */
  52 //]
  53