bool InPoly(int x,y; Polygon poly) {
  int h := poly.size();
  int j := h;
  int Result := false;
  for(var i=0; i < h; i++) {
      if ((poly[i].y < y) && (poly[j].y >= y) || (poly[j].y < y) and (poly[i].y >= y)) &&
          (poly[i].x + (y - poly[i].y) / (poly[j].y - poly[i].y) * (poly[j].x - poly[i].x) < x)
          Result := !Result;
      j := i;
  };
  return Result;
}