public void h3IndexesAreNeighbors()
{
H3Index sf = H3Index.geoToH3(ref sfGeo, 9);
List <H3Index> ring = new ulong[Algos.maxKringSize(1)].Select(cell => new H3Index(cell)).ToList();
Algos.hexRing(sf, 1, ref ring);
Assert.True
(
H3UniEdge.h3IndexesAreNeighbors(sf, sf) == 0,
"an index does not neighbor itself"
);
int neighbors = 0;
for (int i = 0; i < Algos.maxKringSize(1); i++)
{
if (ring[i] != 0 && H3UniEdge.h3IndexesAreNeighbors(sf, ring[i]) != 0)
{
neighbors++;
}
}
Assert.True
(
neighbors == 6,
"got the expected number of neighbors from a k-ring of 1"
);
var largerRing = new ulong[Algos.maxKringSize(2)].Select(cell => new H3Index(cell)).ToList();
Algos.hexRing(sf, 2, ref largerRing);
neighbors = 0;
for (int i = 0; i < Algos.maxKringSize(2); i++)
{
if (largerRing[i] != 0 &&
H3UniEdge.h3IndexesAreNeighbors(sf, largerRing[i]) != 0)
{
neighbors++;
}
}
Assert.True
(
neighbors == 0,
"got no neighbors, as expected, from a k-ring of 2"
);
H3Index sfBroken = sf;
H3Index.H3_SET_MODE(ref sfBroken, Constants.H3_UNIEDGE_MODE);
Assert.True
(
H3UniEdge.h3IndexesAreNeighbors(sf, sfBroken) == 0,
"broken H3Indexes can't be neighbors"
);
H3Index sfBigger = H3Index.geoToH3(ref sfGeo, 7);
Assert.True
(
H3UniEdge.h3IndexesAreNeighbors(sf, sfBigger) == 0,
"hexagons of different resolution can't be neighbors"
);
Assert.True
(
H3UniEdge.h3IndexesAreNeighbors(ring[2], ring[1]) == 1,
"hexagons in a ring are neighbors"
);
}