ceph/src/boost/libs/geometry/doc/src/examples/io/svg.cpp

   1 // Boost.Geometry (aka GGL, Generic Geometry Library)
   2 // QuickBook Example
   3
   4 // Copyright (c) 2013 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 //[svg_mapper
  11 //` Shows the usage of svg_mapper
  12
  13 #include <iostream>
  14 #include <fstream>
  15
  16 #include <boost/geometry.hpp>
  17 #include <boost/geometry/geometries/point_xy.hpp>
  18 #include <boost/geometry/geometries/polygon.hpp>
  19
  20 int main()
  21 {
  22     // Specify the basic type
  23     typedef boost::geometry::model::d2::point_xy<double> point_type;
  24
  25     // Declare some geometries and set their values
  26     point_type a;
  27     boost::geometry::assign_values(a, 3, 6);
  28
  29     boost::geometry::model::polygon<point_type> b;
  30     boost::geometry::read_wkt("POLYGON((0 0,0 7,4 2,2 0,0 0))", b);
  31
  32     boost::geometry::model::linestring<point_type> c;
  33     c.push_back(point_type(3, 4));
  34     c.push_back(point_type(4, 5));
  35
  36     // Declare a stream and an SVG mapper
  37     std::ofstream svg("my_map.svg");
  38     boost::geometry::svg_mapper<point_type> mapper(svg, 400, 400);
  39
  40     // Add geometries such that all these geometries fit on the map
  41     mapper.add(a);
  42     mapper.add(b);
  43     mapper.add(c);
  44
  45     // Draw the geometries on the SVG map, using a specific SVG style
  46     mapper.map(a, "fill-opacity:0.5;fill:rgb(153,204,0);stroke:rgb(153,204,0);stroke-width:2", 5);
  47     mapper.map(b, "fill-opacity:0.3;fill:rgb(51,51,153);stroke:rgb(51,51,153);stroke-width:2");
  48     mapper.map(c, "opacity:0.4;fill:none;stroke:rgb(212,0,0);stroke-width:5");
  49
  50     // Destructor of map will be called - adding </svg>
  51     // Destructor of stream will be called, closing the file
  52
  53     return 0;
  54 }
  55
  56 //]
  57
  58
  59 //[svg_mapper_output
  60 /*`
  61 Output:
  62
  63 [$img/io/svg_mapper.png]
  64 */
  65 //]