Method BlockPolygon

deps/tesseract/ccmain/pageiterator.cpp:367–383

Returns the polygon outline of the current block. The returned Pta must * be ptaDestroy-ed after use. */

/** Returns the polygon outline of the current block. The returned Pta must
 *  be ptaDestroy-ed after use. */
Pta* PageIterator::BlockPolygon() const {
  if (it_->block() == NULL || it_->block()->block == NULL)
    return NULL;  // Already at the end!
  if (it_->block()->block->poly_block() == NULL)
    return NULL;  // No layout analysis used - no polygon.
  ICOORDELT_IT it(it_->block()->block->poly_block()->points());
  Pta* pta = ptaCreate(it.length());
  int num_pts = 0;
  for (it.mark_cycle_pt(); !it.cycled_list(); it.forward(), ++num_pts) {
    ICOORD* pt = it.data();
    // Convert to top-down coords within the input image.
    float x = static_cast<float>(pt->x()) / scale_ + rect_left_;
    float y = rect_top_ + rect_height_ - static_cast<float>(pt->y()) / scale_;
    ptaAddPt(pta, x, y);
  }
  return pta;
}

/**
 * Returns a binary image of the current object at the given level.