PostGIS  2.4.9dev-r@@SVN_REVISION@@

◆ getEdgeWithinDistance2D

LWT_ISO_EDGE*(* LWT_BE_CALLBACKS_T::getEdgeWithinDistance2D) (const LWT_BE_TOPOLOGY *topo, const LWPOINT *pt, double dist, int *numelems, int fields, int limit)

Get edges within distance by point.

topothe topology to act upon
ptthe query point
distthe distance
numelemsoutput parameter, gets number of elements found if the return is not null, otherwise see
section for semantic.
fieldsfields to be filled in the returned structure, see LWT_COL_EDGE_* macros
limitmax number of edges to return, 0 for no limit, -1 to only check for existance if a matching row.
an array of edges or null in the following cases:
  • limit=-1 ("numelems" is set to 1 if found, 0 otherwise)
  • limit>0 and no records found ("numelems" is set to 0)
  • error ("numelems" is set to -1)

Definition at line 292 of file liblwgeom_topo.h.