#include <cassert>
#include <iostream>
#include <vector>
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Weffc++"
#pragma GCC diagnostic ignored "-Wunused-local-typedefs"
#pragma GCC diagnostic ignored "-Wunused-variable"
#include <boost/geometry/algorithms/equals.hpp>
#include <boost/geometry/geometries/point_xy.hpp>
#include <boost/geometry/geometries/polygon.hpp>
#include <boost/geometry/geometries/linestring.hpp>
#include <boost/geometry/io/wkt/read.hpp>
#pragma GCC diagnostic pop
//Convert a polygon to linestring and back
int main()
{
typedef boost::geometry::model::d2::point_xy<double> Point;
typedef boost::geometry::model::linestring<Point> Linestring;
typedef boost::geometry::model::polygon<Point> Polygon;
//Create polygon
Polygon polygon;
boost::geometry::read_wkt(
"POLYGON((1.0 1.0, 1.0 3.0, 3.0 3.0, 3.0 1.0))",
polygon
);
//Convert polygon to linestring
Linestring linestring;
boost::geometry::append(linestring, polygon.outer());
//Convert linestring to new polygon
Polygon new_polygon;
boost::geometry::append(new_polygon, linestring);
//Check that the resulting polygon equals the original
//Instead of using this syntax:
// assert(polygon == new_polygon);
//operator== needs to be defined, which is done by a lambda function
assert(
std::equal(
polygon.outer().begin(),polygon.outer().end(),
new_polygon.outer().begin(),
[](const Point& a, const Point& b)
{
return boost::geometry::equals(a,b);
}
)
);
}
|
