/// <summary>
/// Given a starting and destination hex direction, returns a multiplier you can
/// apply to a radian velocity to rotate in the shortest direction to your target.
/// </summary>
/// <param name="from">The direction you are starting from</param>
/// <param name="to">The direction you are heading to</param>
/// <returns>-1.0f if clockwise is the shortest rotation to reach to, 1.0f otherwise.
/// One of these is chosen randomly if from and to are opposites (e.g., north and
/// south)</returns>
public static float ShortestRotationDirection(HexDirection from, HexDirection to)
{
const float clockwise = -1.0f;
const float anticlockwise = 1.0f;
var clockwiseDist = (from.Ordinal() - to.Ordinal()).Mod(6);
if (clockwiseDist < 3)
{
return(clockwise);
}
else if (clockwiseDist == 3)
{
return((_rng.Next(2) == 0) ? clockwise : anticlockwise);
}
else
{
return(anticlockwise);
}
}