PK_EDGE_ask_vertices

PK_ERROR_code_t PK_EDGE_ask_vertices
(
--- received arguments ---
PK_EDGE_t       edge,              --- an edge

--- returned arguments ---
PK_VERTEX_t     vertices[2]        --- vertices (possibly both PK_ENTITY_null)
)


This function returns the vertices bounding the given edge.


The first entry in the array 'vertices' will be the start vertex,
and the second, the end vertex. If the edge is a ring edge, both entries
in the return array will take the value PK_ENTITY_null.