void *canon(void *args)
{
  struct canon_arg *arguments;
  arguments = (struct canon_arg *) args;
  int **image;
  image = arguments->image;
  
  int **energy;
  energy = arguments->energy;

  int pcnt = arguments->pcnt;
  
  int id = arguments->id;
  
  printf("Thread with id %d starting\n",id);
  
/*
  printf("pcnt:%d\n",pcnt);
  printf("x:%f\n",arguments->pos.a);
  printf("y:%f\n",arguments->pos.b);
  printf("ax:%f\n",arguments->angle.a);
  printf("ay:%f\n",arguments->angle.b);
  */

  int i;

  for(i = 0; i < pcnt+1; i++)
  {
    //double x = pos.a;
    double x = arguments->pos.a;
    //double y = pos.b;
    double y = arguments->pos.b;
    
    //double ax = angle.a;
    double ax = arguments->angle.a;
    //double ay = angle.b;
    double ay = arguments->angle.b;

    double sx = normal_variate(.0,0.15);
    
    double sy = normal_variate(.0,0.15);
  

    double dx = ax+sx;

    double dy = ay+sy;

    int done = 0;
    
    while(x>=0 && y >= 0 && x < xsize && y < ysize && !done)
    {
      int density = (int)(randint(11)*(256-image[(int)x][(int)y]));
      if(density > 1700)
      {
        int ix = (int)x;
        int iy = (int)y;
        energy[ix][iy]=energy[ix][iy]+1;
        done = 1;
      }
      x=x+dx;
      y=y+dy;
    }
  }
  printf("Thread with id %d finishing\n",id);
  return NULL;
}