Miscellany

bool PolyObj::findSegmentAt(int x, int y, Coord *point1, Coord *point2)
{
printf("foo\n");
  int i;
  for (i = 0; i < nrPoints(); ++i)
  {
    point1 = (Coord*)(points->get(i));
    if (i == (points->size() - 1))
      point2 = (Coord*)(points->get(0));
    else
      point2 = (Coord*)(points->get(i+1));
//printf("bar %x %x\n", (int)point1, (int)point2);
    if (((point1->x <= x && x <= point2->x) ||
         (point2->x <= x && x <= point1->x)) &&
        ((point1->y <= y && y <= point2->y) ||
         (point2->y <= y && y <= point1->y)))
      return true;
  }
  return false;
}

called:
  Coord *oldPoint1, *oldPoint2;
in loop:
    if (findSegmentAt(photon->xOrigin, photon->yOrigin, oldPoint1, oldPoint2))
    {
      if ((oldPoint1 == point1 && oldPoint2 == point2) ||
          (oldPoint1 == point2 && oldPoint2 == point1))
        continue;
    }