Polytope_distance_d/width_simplex.cpp

#include <CGAL/Homogeneous.h>
#include <CGAL/Width_default_traits_3.h>
#include <CGAL/Width_3.h>
#include <iostream>
#include <vector>

#if defined(CGAL_USE_GMP)
#include <CGAL/Gmpz.h>
typedef CGAL::Gmpz                           RT;
#elif defined (CGAL_USE_LEDA)
#include <CGAL/leda_integer.h>
typedef leda_integer                          RT;
#else
#include <CGAL/MP_Float.h>
typedef CGAL::MP_Float                        RT;
#endif

typedef CGAL::Homogeneous<RT>                 Kernel;
typedef Kernel::Point_3                       Point_3;
typedef Kernel::Plane_3                       Plane_3;
typedef CGAL::Width_default_traits_3<Kernel>  Width_traits;
typedef CGAL::Width_3<Width_traits>           Width;

int main() {
    // Create a simplex using homogeneous integer coordinates
    std::vector<Point_3> points;
    points.push_back( Point_3(2,0,0,1));
    points.push_back( Point_3(0,1,0,1));
    points.push_back( Point_3(0,0,1,1));
    points.push_back( Point_3(0,0,0,1));

    // Compute width of simplex
    Width simplex( points.begin(), points.end());

    // Output of squared width, width-planes, and optimal direction
    RT wnum, wdenom;
    simplex.get_squared_width( wnum, wdenom);
    std::cout << "Squared Width: " << wnum << "/" << wdenom << std::endl;

    std::cout << "Direction: " << simplex.get_build_direction() << std::endl;

    Plane_3  e1, e2;
    simplex.get_width_planes (e1, e2);
    std::cout << "Planes: E1: " << e1 << ".  E2: " << e2 <<std::endl;

    std::cout << "Number of optimal solutions: "
              << simplex.get_number_of_optimal_solutions() << std::endl;
    return(0);
}