geometry/example/06_a_transformation_example.cpp at develop · boostorg/geometry · GitHub

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// Boost.Geometry (aka GGL, Generic Geometry Library)

// 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;

}

geometry/example/06_a_transformation_example.cpp at develop · boostorg/geometry · GitHub

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