CGAL 4.7 - CGAL Ipelets: CGAL_ipelets/simple_triangulation.cpp

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CGAL 4.7 - CGAL Ipelets

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CGAL_ipelets/simple_triangulation.cpp
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Delaunay_triangulation_2.h>
#include <CGAL/CGAL_Ipelet_base.h>
namespace my_triangulation{
typedef CGAL::Exact_predicates_inexact_constructions_kernel Kernel;
typedef CGAL::Delaunay_triangulation_2<Kernel> Delaunay;
//Function names of the ipelet
const std::string labels[] = { "Delaunay","Help" };
//Help message associated to the first function
const std::string hmsg[] = {
"Draw a Delaunay triangulation of a set of points"
};
class Triangulation_ipelet
: public CGAL::Ipelet_base<Kernel,2>{
public:
//declare an ipelet called CGAL Delaunay, with 2 functions (including help message).
Triangulation_ipelet()
:CGAL::Ipelet_base<Kernel,2>("CGAL Delaunay",labels,hmsg){}
void protected_run(int);
};
//function called when using the ipelet.
void Triangulation_ipelet::protected_run(int fn)
{
switch (fn){
case 1:
show_help();//print an help message
return;
default:
std::list<Point_2> pt_lst;
//Recovering points using output iterator of type
//Dispatch_or_drop_output_iterator
read_active_objects(
CGAL::dispatch_or_drop_output<Point_2>(std::back_inserter(pt_lst))
);
if (pt_lst.empty()) {
print_error_message("No mark selected");
return;
}
Delaunay dt;
dt.insert(pt_lst.begin(),pt_lst.end());
//draw the triangulation.
draw_in_ipe(dt);
};
}
}//namespace my_triangulation
//register the ipelet in Ipe
CGAL_IPELET(my_triangulation::Triangulation_ipelet)