Method overlap

deps/tesseract/ccstruct/polyblk.cpp:304–340

@return true if the polygons of other and this overlap.

/// @return true if the polygons of other and this overlap.
bool POLY_BLOCK::overlap(POLY_BLOCK *other) {
  inT16 count;                   // winding count
  ICOORDELT_IT it = &vertices;   // iterator
  ICOORD vertex;

  if (!box.overlap(*(other->bounding_box())))
    return false;                // can't be any overlap.

  /* see if a vertex of this is inside other */

  do {
    vertex = *it.data ();
                                 // get winding number
    count = other->winding_number (vertex);
    if (count != INTERSECTING)
      if (count != 0)
        return true;
    it.forward ();
  }
  while (!it.at_first ());

  /* see if a vertex of other is inside this */

                                 // switch lists
  it.set_to_list (other->points ());
  do {
    vertex = *it.data();
                                 // try other way round
    count = winding_number (vertex);
    if (count != INTERSECTING)
      if (count != 0)
        return true;
    it.forward ();
  }
  while (!it.at_first ());
  return false;
}


ICOORDELT_LIST *PB_LINE_IT::get_line(inT16 y) {