_lwt_EdgeRingIsCCW()

static int _lwt_EdgeRingIsCCW ( LWT_EDGERING *  ring )

static

Definition at line 6674 of file lwgeom_topo.c.

{
  double sa;
 
  LWDEBUGF(2, "_lwt_EdgeRingIsCCW, ring has %d elems", ring->size);
  LWT_EDGERING_POINT_ITERATOR *it = _lwt_EdgeRingIterator_begin(ring);
  sa = _lwt_EdgeRingSignedArea(it);
  LWDEBUGF(2, "_lwt_EdgeRingIsCCW, signed area is %g", sa);
  lwfree(it);
  if ( sa >= 0 ) return 0;
  else return 1;
}

References _lwt_EdgeRingIterator_begin(), _lwt_EdgeRingSignedArea(), LWDEBUGF, lwfree(), and LWT_EDGERING_T::size.

Referenced by _lwt_RegisterFaceOnEdgeSide().

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