/// <summary>
/// Returns the destination hexagon from the unidirectional edge H3Index
/// </summary>
/// <param name="edge">The edge H3 index</param>
/// <returns>The destination H3 hexagon index</returns>
/// <!-- Based off 3.1.1 -->
public static H3Index getDestinationH3IndexFromUnidirectionalEdge(H3Index edge)
{
if (H3Index.H3_GET_MODE(ref edge) != Constants.H3_UNIEDGE_MODE)
{
return(H3Index.H3_INVALID_INDEX);
}
Direction direction = (Direction)H3Index.H3_GET_RESERVED_BITS(edge);
int rotations = 0;
H3Index destination = Algos
.h3NeighborRotations
(
getOriginH3IndexFromUnidirectionalEdge(edge),
direction,
ref rotations
);
return(destination);
}
/// <summary>
/// Determines if the provided H3Index is a valid unidirectional edge index
/// </summary>
/// <param name="edge">The unidirectional edge H3Index</param>
/// <returns>1 if it is a unidirectional edge H3Index, otherwise 0.</returns>
/// <!-- Based off 3.1.1 -->
public static int h3UnidirectionalEdgeIsValid(H3Index edge)
{
if (H3Index.H3_GET_MODE(ref edge) != Constants.H3_UNIEDGE_MODE)
{
return(0);
}
Direction neighborDirection = (Direction)H3Index.H3_GET_RESERVED_BITS(edge);
if (neighborDirection <= Direction.CENTER_DIGIT ||
neighborDirection >= Direction.NUM_DIGITS)
{
return(0);
}
H3Index origin = getOriginH3IndexFromUnidirectionalEdge(edge);
if (H3Index.h3IsPentagon(origin) != 0 && neighborDirection == Direction.K_AXES_DIGIT)
{
return(0);
}
return(H3Index.h3IsValid(origin));
}
