#include <cassert>
#include <iostream>
#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.hpp>
#include <boost/geometry/geometries/point_xy.hpp>
#include <boost/geometry/geometries/ring.hpp>
//#include <boost/geometry/geometries/adapted/std_as_ring.hpp> //Is absent in 1.54.0
#pragma GCC diagnostic pop
int main()
{
typedef boost::geometry::model::d2::point_xy<double> Coordinat2D;
/* Polygon used:
3-
|
2- 0 #
| / \
1- 4 1
| | * |
0- 3---2
|
+--|---|---|
0 1 2
*: point that is tested to be within the polygon
#: point that is tested to be outside of the polygon
*/
const std::vector<Coordinat2D> points {
{0.5, 2.0}, //0
{1.0, 1.0}, //1
{1.0, 0.0}, //2
{0.0, 0.0}, //3
{0.0, 1.0} //4
};
boost::geometry::model::polygon<Coordinat2D> house;
boost::geometry::append(house, points);
boost::geometry::model::ring<Coordinat2D> points_again;
boost::geometry::convert(house,points_again);
//Instead of using this syntax:
// assert(points == points_again);
//operator== needs to be defined, which is done by a lambda function
assert(
std::equal(
points.begin(),points.end(),
points_again.begin(),
[](const Coordinat2D& a,const Coordinat2D& b)
{
return boost::geometry::equals(a,b);
}
)
);
assert( boost::geometry::within(Coordinat2D(0.5, 0.5), house));
assert(!boost::geometry::within(Coordinat2D(1.0, 2.0), house));
const double area = boost::geometry::area(house);
std::cout << "Area: " << area << std::endl;
}
|
