_lwt_EdgeRingIterator_begin()

static LWT_EDGERING_POINT_ITERATOR* _lwt_EdgeRingIterator_begin ( LWT_EDGERING *  er )

static

Definition at line 6294 of file lwgeom_topo.c.

{
  LWT_EDGERING_POINT_ITERATOR *ret = lwalloc(sizeof(LWT_EDGERING_POINT_ITERATOR));
  ret->ring = er;
  if ( er->size ) ret->curelem = er->elems[0];
  else ret->curelem = NULL;
  ret->curelemidx = 0;
  ret->curidx = (ret->curelem == NULL || ret->curelem->left) ? 0 : ret->curelem->edge->geom->points->npoints - 1;
  return ret;
}

References LWT_EDGERING_POINT_ITERATOR_T::curelem, LWT_EDGERING_POINT_ITERATOR_T::curelemidx, LWT_EDGERING_POINT_ITERATOR_T::curidx, LWT_EDGERING_ELEM_T::edge, LWT_EDGERING_T::elems, LWT_ISO_EDGE::geom, LWT_EDGERING_ELEM_T::left, lwalloc(), POINTARRAY::npoints, LWLINE::points, LWT_EDGERING_POINT_ITERATOR_T::ring, and LWT_EDGERING_T::size.

Referenced by _lwt_EdgeRingContainsPoint(), and _lwt_EdgeRingIsCCW().

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