_lwt_RegisterFaceOnEdgeSide()

static int _lwt_RegisterFaceOnEdgeSide ( LWT_TOPOLOGY *  topo, LWT_ISO_EDGE *  edge, int  side, LWT_ISO_EDGE_TABLE *  edges, LWT_EDGERING_ARRAY *  holes, LWT_EDGERING_ARRAY *  shells, LWT_ELEMID *  registered  )

static

Definition at line 6805 of file lwgeom_topo.c.

{
  const LWT_BE_IFACE *iface = topo->be_iface;
  /* this is arbitrary, could be taken as parameter */
  static const int placeholder_faceid = LWT_HOLES_FACE_PLACEHOLDER;
  LWT_EDGERING *ring;
 
  /* Get edge ring */
  ring = _lwt_BuildEdgeRing(topo, edges, edge, side);
 
        LWDEBUG(2, "Ring built, calling EdgeRingIsCCW");
 
  /* Compute winding (CW or CCW?) */
  int isccw = _lwt_EdgeRingIsCCW(ring);
 
  if ( isccw )
  {
    /* Create new face */
    LWT_ISO_FACE newface;
 
    LWDEBUGF(1, "Ring of edge %d is a shell (shell %d)", edge->edge_id * side, shells->size);
 
    newface.mbr = _lwt_EdgeRingGetBbox(ring);
 
    newface.face_id = -1;
    /* Insert the new face */
    int ret = lwt_be_insertFaces( topo, &newface, 1 );
    newface.mbr = NULL;
    if ( ret == -1 )
    {
      lwerror("Backend error: %s", lwt_be_lastErrorMessage(topo->be_iface));
      return -1;
    }
    if ( ret != 1 )
    {
      lwerror("Unexpected error: %d faces inserted when expecting 1", ret);
      return -1;
    }
    /* return new face_id */
    *registered = newface.face_id;
    LWT_EDGERING_ARRAY_PUSH(shells, ring);
 
    /* update ring edges set new face_id on resp. side to *registered */
    ret = _lwt_UpdateEdgeRingSideFace(topo, ring, *registered);
    if ( ret )
    {
        lwerror("Errors updating edgering side face: %s",
                lwt_be_lastErrorMessage(iface));
        return -1;
    }
 
  }
  else /* cw, so is an hole */
  {
    LWDEBUGF(1, "Ring of edge %d is a hole (hole %d)", edge->edge_id * side, holes->size);
    *registered = placeholder_faceid;
    LWT_EDGERING_ARRAY_PUSH(holes, ring);
  }
 
  return 0;
}

References _lwt_BuildEdgeRing(), _lwt_EdgeRingGetBbox(), _lwt_EdgeRingIsCCW(), _lwt_UpdateEdgeRingSideFace(), LWT_TOPOLOGY_T::be_iface, LWT_ISO_EDGE::edge_id, LWT_ISO_FACE::face_id, LWDEBUG, LWDEBUGF, lwerror(), lwt_be_insertFaces(), lwt_be_lastErrorMessage(), LWT_EDGERING_ARRAY_PUSH, LWT_HOLES_FACE_PLACEHOLDER, LWT_ISO_FACE::mbr, and LWT_EDGERING_ARRAY_T::size.

Referenced by lwt_Polygonize().

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