CGAL users discussion list

["Zheng,Guang" <>]

Hi, all:

 

I'm pretty new to cgal, and studying some example recently. I tried to modified a little bit of the example code in order to read a txt file to STL vector structure, but it doen't work.

 

Could someone help me ? here is the code:

 

#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/convex_hull_2.h>

#include <vector>
#include <iostream>
#include <fstream>
#include <iomanip>

using namespace std;

typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
typedef K::Point_2 Point_2;
typedef std::vector<Point_2> Points;

int main()
{

Points points, result;

ifstream file_to_read("1.txt");

double x,y;
while(!file_to_read.eof())
{

CGAL::set_ascii_mode( file_to_read );
file_to_read>>x;
file_to_read.ignore(1);
file_to_read>>y;
file_to_read.ignore(1);

points.push_back(Point_2(x,y));
};

  /*points.push_back(Point_2(0,0));
  points.push_back(Point_2(10,0));
  points.push_back(Point_2(10,10));
  points.push_back(Point_2(6,5));
  points.push_back(Point_2(4,1));
*/

  CGAL::convex_hull_2( points.begin(), points.end(), std::back_inserter(result) );
  std::cout << result.size() << " points on the convex hull" << std::endl;

  return 0;
}

 

 

Thanks very much!

-- 
Guang Zheng