private static IHexCoordinate Round(double x, double y, double z)
{
var rX = (int)Math.Round(x);
var rY = (int)Math.Round(y);
var rZ = (int)Math.Round(z);
var xDiff = Math.Abs(rX - x);
var yDiff = Math.Abs(rY - y);
var zDiff = Math.Abs(rZ - z);
if (xDiff > yDiff && xDiff > yDiff)
{
rX = -rY - rZ;
}
else if (yDiff > zDiff)
{
rY = -rX - rZ;
}
else
{
rZ = -rX - rY;
}
return(HexCoordinates.Cube(rX, rY, rZ));
}
/// <summary>
/// <para>
/// Returns all <see cref="IHexCoordinate" /> within <paramref name="radius" /> and <paramref name="coordinate" />
/// as center.
/// </para>
/// </summary>
/// <param name="coordinate">Current <see cref="IHexCoordinate" />.</param>
/// <param name="radius">Radius from <paramref name="coordinate" />. 0 returns <paramref name="coordinate" />.</param>
/// <returns>All <see cref="IHexCoordinate" /> within <paramref name="radius" />.</returns>
/// <exception cref="ArgumentOutOfRangeException"><paramref name="radius" /> < 0. </exception>
/// <exception cref="ArgumentNullException"><paramref name="coordinate" /> is null.</exception>
public static IEnumerable <IHexCoordinate> Range(this IHexCoordinate coordinate, int radius)
{
if (coordinate == null)
{
throw new ArgumentNullException("coordinate");
}
if (radius == 0)
{
yield return(coordinate);
yield break;
}
if (radius < 0)
{
throw new ArgumentOutOfRangeException("radius");
}
for (var dx = -radius; dx <= radius; dx++)
{
for (var dy = Math.Max(-radius, -dx - radius); dy <= Math.Min(radius, -dx + radius); dy++)
{
yield return(HexCoordinates.Cube(dx, dy, -dx - dy).Add(coordinate));
}
}
}
/// <summary>
/// Initializes a new unit <see cref="IHexCoordinate" /> with given <paramref name="direction" /> and
/// <paramref name="distance" />.
/// </summary>
/// <param name="direction">Direction from (0, 0).</param>
/// <param name="distance">Distance from (0, 0).</param>
/// <returns>Unit <see cref="IHexCoordinate" />.</returns>
/// <exception cref="ArgumentOutOfRangeException">
/// <para><paramref name="distance" /> < 0.</para>
/// <para><paramref name="direction" /> out of range.</para>
/// </exception>
public static IHexCoordinate Distance(this HexDirection direction, int distance)
{
return(HexCoordinates.Axial(0, 0).Neighbor(direction, distance));
}
