getEdgeByFace

LWT_ISO_EDGE*(* LWT_BE_CALLBACKS_T::getEdgeByFace) (const LWT_BE_TOPOLOGY *topo, const LWT_ELEMID *ids, int *numelems, int fields, const GBOX *box)

Get edges that have any of the given faces on the left or right side and optionally whose bounding box overlaps the given one.

Parameters

topo	the topology to act upon
ids	an array of face identifiers
numelems	input/output parameter, pass number of face identifiers in the input array, gets number of edges in output array if the return is not null, otherwise see

Returns

section for semantic.

Parameters

fields	fields to be filled in the returned structure, see LWT_COL_EDGE_* macros
box	optional bounding box to further restrict matches, use NULL for no further restriction.

Returns

an array of edges identifiers or NULL in the following cases:

• no edge found ("numelems" is set to 0)
• error ("numelems" is set to -1)

Definition at line 653 of file liblwgeom_topo.h.