_lwt_GetEqualEdge()

static LWT_ELEMID _lwt_GetEqualEdge ( LWT_TOPOLOGY *  topo, LWLINE *  edge, int *  forward  )

static

Definition at line 5421 of file lwgeom_topo.c.

{
  LWT_ELEMID id;
  LWT_ISO_EDGE *edges;
  uint64_t num, i;
  const GBOX *qbox = lwgeom_get_bbox( lwline_as_lwgeom(edge) );
  GEOSGeometry *edgeg;
  const int flds = LWT_COL_EDGE_EDGE_ID|LWT_COL_EDGE_GEOM;
 
  edges = lwt_be_getEdgeWithinBox2D( topo, qbox, &num, flds, 0 );
  if (num == UINT64_MAX)
  {
    lwerror("Backend error: %s", lwt_be_lastErrorMessage(topo->be_iface));
    return -1;
  }
  if ( num )
  {
    initGEOS(lwnotice, lwgeom_geos_error);
 
    edgeg = LWGEOM2GEOS( lwline_as_lwgeom(edge), 0 );
    if ( ! edgeg )
    {
      _lwt_release_edges(edges, num);
      lwerror("Could not convert edge geometry to GEOS: %s", lwgeom_geos_errmsg);
      return -1;
    }
    for (i=0; i<num; ++i)
    {
      LWT_ISO_EDGE *e = &(edges[i]);
      LWGEOM *g = lwline_as_lwgeom(e->geom);
      GEOSGeometry *gg;
      int equals;
      gg = LWGEOM2GEOS( g, 0 );
      if ( ! gg )
      {
        GEOSGeom_destroy(edgeg);
        _lwt_release_edges(edges, num);
        lwerror("Could not convert edge geometry to GEOS: %s", lwgeom_geos_errmsg);
        return -1;
      }
      equals = GEOSEquals(gg, edgeg);
      GEOSGeom_destroy(gg);
      if ( equals == 2 )
      {
        GEOSGeom_destroy(edgeg);
        _lwt_release_edges(edges, num);
        lwerror("GEOSEquals exception: %s", lwgeom_geos_errmsg);
        return -1;
      }
      if ( equals )
      {
        id = e->edge_id;
        /* Check if direction also matches */
        if ( forward )
        {
          /* If input line is closed, we use winding order */
          if ( lwline_is_closed(edge) )
          {
            if ( ptarray_isccw(edge->points) == ptarray_isccw(e->geom->points) )
            {
              *forward = 1;
            }
            else
            {
              *forward = 0;
            }
          }
          else
          {
            /* Input line is not closed, checking fist point is enough */
            if (
              memcmp(
                  getPoint_internal(edge->points, 0),
                  getPoint_internal(e->geom->points, 0),
                  sizeof(POINT2D)
              ) == 0
            )
            {
              *forward = 1;
            }
            else
            {
              *forward = 0;
            }
          }
        }
        GEOSGeom_destroy(edgeg);
        _lwt_release_edges(edges, num);
        return id;
      }
    }
    GEOSGeom_destroy(edgeg);
    _lwt_release_edges(edges, num);
  }
 
  return 0;
}

References _lwt_release_edges(), LWT_TOPOLOGY_T::be_iface, LWT_ISO_EDGE::edge_id, LWT_ISO_EDGE::geom, getPoint_internal(), lwerror(), LWGEOM2GEOS(), lwgeom_geos_errmsg, lwgeom_geos_error(), lwgeom_get_bbox(), lwline_as_lwgeom(), lwline_is_closed(), lwnotice(), lwt_be_getEdgeWithinBox2D(), lwt_be_lastErrorMessage(), LWT_COL_EDGE_EDGE_ID, LWT_COL_EDGE_GEOM, LWLINE::points, and ptarray_isccw().

Referenced by _lwt_AddLineEdge().

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