#include <stdlib.h>
#include <stdio.h>
#include "descartes.h"

int main(void)
{
   point_t   curr,  /* Current point */ 
             prev,  /* Previous point */
             init;  /* Initial point */
   lineSeg_t l;     /* Line segment joining prev and curr */

   OpenGraphics();
   prev = GetPoint();
   curr = GetPoint();
   init = prev;   /* this stores the first vertex in the 
                     variable "init": we need to remember it, 
                     to be able to join it to the last vertex 
                     when it is entered */

   while (XCoord(curr) >= 0) {
      /* 
       * Process the current edge. 
       * The current edge joins the previous 
       * vertex "prev" to the current vertex "curr".  
       */
      prev = curr;
      curr = GetPoint();
   }

   /*
    * Now tackle the last edge - remember, the first vertex 
    * is stored in the variable "init" 
    */
   
   CloseGraphics();
   return EXIT_SUCCESS;
}