\( \newcommand{\E}{\mathrm{E}} \) \( \newcommand{\A}{\mathrm{A}} \) \( \newcommand{\R}{\mathrm{R}} \) \( \newcommand{\N}{\mathrm{N}} \) \( \newcommand{\Q}{\mathrm{Q}} \) \( \newcommand{\Z}{\mathrm{Z}} \) \( \def\ccSum #1#2#3{ \sum_{#1}^{#2}{#3} } \def\ccProd #1#2#3{ \sum_{#1}^{#2}{#3} }\)
CGAL 4.12.2 - Cone-Based Spanners
Cone_spanners_2/compute_cones.cpp
#include <cstdlib>
#include <iostream>
#include <iterator>
#include <vector>
#include <CGAL/Exact_predicates_exact_constructions_kernel_with_root_of.h>
#include <CGAL/Compute_cone_boundaries_2.h>
// select the kernel type
typedef Kernel::Point_2 Point_2;
typedef Kernel::Direction_2 Direction_2;
int main(int argc, char ** argv) {
if (argc < 2) {
std::cout << "Usage: " << argv[0] << " <no. of cones> [<direction-x> <direction-y>]" << std::endl;
return 1;
}
unsigned int k = atoi(argv[1]);
if (k<2) {
std::cout << "The number of cones should be larger than 1!" << std::endl;
return 1;
}
Direction_2 initial_direction;
if (argc == 2)
initial_direction = Direction_2(1, 0); // default initial_direction
else if (argc == 4)
initial_direction = Direction_2(atof(argv[2]), atof(argv[3]));
else {
std::cout << "Usage: " << argv[0] << " <no. of cones> [<direction-x> <direction-y>]" << std::endl;
return 1;
}
// construct the functor
// create the vector rays to store the results
std::vector<Direction_2> rays(k);
// compute the cone boundaries and store them in rays
cones(k, initial_direction, rays.begin());
// display the computed rays, starting from the initial direction, ccw order
for (unsigned int i=0; i<k; i++)
std::cout << "Ray " << i << ": " << rays[i] << std::endl;
return 0;
}