getEdgeWithinBox2D

LWT_ISO_EDGE*(* LWT_BE_CALLBACKS_T::getEdgeWithinBox2D) (const LWT_BE_TOPOLOGY *topo, const GBOX *box, int *numelems, int fields, int limit)

Get edges whose bounding box overlaps a given 2D bounding box.

Parameters

topo	the topology to act upon
box	the query box, to be considered infinite if NULL
numelems	output parameter, gets number of elements found 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
limit	max number of edges to return, 0 for no limit, -1 to only check for existance if a matching row.

Returns

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 475 of file liblwgeom_topo.h.