57 lines
1.9 KiB
C++
57 lines
1.9 KiB
C++
// Boost.Geometry (aka GGL, Generic Geometry Library)
|
|
|
|
// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
|
|
// Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
|
|
// Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
|
|
|
|
// 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)
|
|
//
|
|
// Transformation Example
|
|
|
|
#include <iostream>
|
|
|
|
#include <boost/geometry/geometry.hpp>
|
|
#include <boost/geometry/geometries/point_xy.hpp>
|
|
#include <boost/geometry/geometries/polygon.hpp>
|
|
#include <boost/geometry/geometries/adapted/c_array.hpp>
|
|
|
|
BOOST_GEOMETRY_REGISTER_C_ARRAY_CS(cs::cartesian)
|
|
|
|
|
|
int main()
|
|
{
|
|
using namespace boost::geometry;
|
|
|
|
typedef model::d2::point_xy<double> point_2d;
|
|
point_2d p(1, 1);
|
|
point_2d p2;
|
|
|
|
// Example: translate a point over (5,5)
|
|
strategy::transform::translate_transformer<double, 2, 2> translate(5, 5);
|
|
|
|
transform(p, p2, translate);
|
|
std::cout << "transformed point " << boost::geometry::dsv(p2) << std::endl;
|
|
|
|
// Transform a polygon
|
|
model::polygon<point_2d> poly, poly2;
|
|
const double coor[][2] = { {0, 0}, {0, 7}, {2, 2}, {2, 0}, {0, 0} };
|
|
// note that for this syntax you have to include the two
|
|
// include files above (c_array.hpp)
|
|
assign_points(poly, coor);
|
|
//read_wkt("POLYGON((0 0,0 7,4 2,2 0,0 0))", poly);
|
|
transform(poly, poly2, translate);
|
|
|
|
std::cout << "source polygon " << boost::geometry::dsv(poly) << std::endl;
|
|
std::cout << "transformed polygon " << boost::geometry::dsv(poly2) << std::endl;
|
|
|
|
// Many more transformations are possible:
|
|
// - from Cartesian to Spherical coordinate systems and back
|
|
// - from Cartesian to Cartesian (mapping, affine transformations) and back (inverse)
|
|
// - Map Projections
|
|
// - from Degree to Radian and back in spherical_equatorial or geographic coordinate systems
|
|
|
|
return 0;
|
|
}
|