CGAL 5.6.1 - 2D Apollonius Graphs (Delaunay Graphs of Disks)
// standard includes
#include <iostream>
#include <fstream>
#include <cassert>
// the number type
#include <CGAL/MP_Float.h>
// example that uses an exact number type
typedef CGAL::MP_Float NT;
// *** WARNING ***
// The use of a kernel based on an exact number type is highly inefficient.
// It is used in this example primarily for illustration purposes.
// In an efficiency critical context, and/or for the purposes of
// benchmarking the Apollonius_graph_filtered_traits_2<> class should
// be used.
// choose the kernel
#include <CGAL/Simple_cartesian.h>
// typedefs for the traits and the algorithm
#include <CGAL/Apollonius_graph_2.h>
#include <CGAL/Apollonius_graph_traits_2.h>
typedef CGAL::Apollonius_graph_2<Traits> Apollonius_graph;
int main()
std::ifstream ifs("data/sites.cin");
assert( ifs );
Apollonius_graph ag;
Apollonius_graph::Site_2 site;
// read the sites and insert them in the Apollonius graph
while ( ifs >> site ) {
// validate the Apollonius graph
assert( ag.is_valid(true, 1) );
std::cout << std::endl;
return 0;