#include "SDL/SDL.h"
#include "Point.h"
#include <map>

void calc_slope(vector<Point>& v, SDL_Surface* screen)
{
  SDL_LockSurface(screen);
  for(auto p : v)
  {
    std::multimap<double, Point> m;
    for(auto t : v)
    {
      m.insert (make_pair(p.slopeTo(t),t));
      if(m.count(p.slopeTo(t)) > 2)
      {
        std::pair <std::multimap<double, Point>::iterator, std::multimap<double, Point>::iterator> ret;
        ret = m.equal_range(p.slopeTo(t));
        for(std::multimap<double, Point>::iterator it = ret.first; it!= ret.second; ++it)
        {
          p.lineTo(screen,t);
        }
      }
    }
  }
  SDL_FreeSurface(screen);
  SDL_Flip(screen); // display screen
}
/*  typedef std::map<double, Point>::iterator it_type;
for(it_type iterator = m.begin(); iterator != m.end(); iterator++)
{
if(!isinf(iterator->first))
{
if(m.count(iterator->first)>2)
{
auto ret = m.equal_range(iterator->first);
//if(iterator->first == iterator++->first)
for(auto i = ret.first ; i != ret.second ; ++i)
{
if(iterator->first == i->first)
render_line(screen,iterator->second,i->second);
}
for(int i = 0; i < m.count(iterator->first)-1 ; ++i)
{
iterator++;
}
//std::cout << ret.first->second << '\t' << ret.second->second<<'\t'<<ret.first->first<<'\n';
//std::cout<<m.count(iterator->first)<<" "<<iterator->first<<'\n';
}
}
}*/