getEdgeAsync method

Future<int> getEdgeAsync(int edge, int nextEdgeType)

Returns one of the edges related to the given edge.

nextEdgeType : Parameter specifying which of the related edges to return. The following values are possible:

• NEXT_AROUND_ORG next around the edge origin ( eOnext on the picture below if e is the input edge)
• NEXT_AROUND_DST next around the edge vertex ( eDnext )
• PREV_AROUND_ORG previous around the edge origin (reversed eRnext )
• PREV_AROUND_DST previous around the edge destination (reversed eLnext )
• NEXT_AROUND_LEFT next around the left facet ( eLnext )
• NEXT_AROUND_RIGHT next around the right facet ( eRnext )
• PREV_AROUND_LEFT previous around the left facet (reversed eOnext )
• PREV_AROUND_RIGHT previous around the right facet (reversed eDnext )

https://docs.opencv.org/4.x/df/dbf/classcv_1_1Subdiv2D.html#af73f08576709bad7a36f8f8e5fc43c84

Implementation

Future<int> getEdgeAsync(int edge, int nextEdgeType) async {
  final p = calloc<ffi.Int>();
  return cvRunAsync0(
    (callback) => cimgproc.cv_Subdiv2D_getEdge(ref, edge, nextEdgeType, p, callback),
    (c) {
      final rval = p.value;
      calloc.free(p);
      return c.complete(rval);
    },
  );
}