/Src/Dependencies/Boost/libs/geometry/doc/src/examples/algorithms/area.cpp
http://hadesmem.googlecode.com/ · C++ · 50 lines · 18 code · 12 blank · 20 comment · 0 complexity · abf77a01de72df3ad91c8ce9a7776571 MD5 · raw file
- // Boost.Geometry (aka GGL, Generic Geometry Library)
- // QuickBook Example
- // Copyright (c) 2011 Barend Gehrels, Amsterdam, the Netherlands.
- // Use, modification and distribution is subject to the Boost Software License,
- // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
- // http://www.boost.org/LICENSE_1_0.txt)
- //[area
- //` Calculate the area of a polygon
- #include <iostream>
- #include <boost/geometry.hpp>
- #include <boost/geometry/geometries/point_xy.hpp>
- #include <boost/geometry/geometries/polygon.hpp>
- #include <boost/geometry/domains/gis/io/wkt/wkt.hpp>
- namespace bg = boost::geometry; /*< Convenient namespace alias >*/
- int main()
- {
- // Calculate the area of a cartesian polygon
- bg::model::polygon<bg::model::d2::point_xy<double> > poly;
- bg::read_wkt("POLYGON((0 0,0 7,4 2,2 0,0 0))", poly);
- double area = bg::area(poly);
- std::cout << "Area: " << area << std::endl;
- // Calculate the area of a spherical equatorial polygon
- bg::model::polygon<bg::model::point<float, 2, bg::cs::spherical_equatorial<bg::degree> > > sph_poly;
- bg::read_wkt("POLYGON((0 0,0 45,45 0,0 0))", sph_poly);
- area = bg::area(sph_poly);
- std::cout << "Area: " << area << std::endl;
- return 0;
- }
- //]
- //[area_output
- /*`
- Output:
- [pre
- Area: 16
- Area: 0.339837
- ]
- */
- //]