/// <summary>
/// Get the minimum number of arc steps, in either direction, from this CardinalDirection to another.
/// The steps are encoded in clockwise direction, so a negative result indicates stepping anticlockwise.
/// </summary>
/// <param name="facing">original direction</param>
/// <param name="to">direction to rotate to</param>
/// <returns>an int between -2 and 3 (inclusive)</returns>
public static int GetArcMinimum(this CardinalDirection facing, CardinalDirection to)
{
var steps = facing.GetArcLinear(to);
if (steps > 3)
{
return(3 - steps);
}
else
{
return(steps);
}
}
/// <summary>
/// Find the relative direction of this direction to another. Specifically, the other
/// direction relative to this one.
/// note: for two directions A and B:
/// A.Turn(A.Cross(B)) = B
/// </summary>
/// <param name="facing">the direction for other to be found relative </param>
/// <param name="other">an other direction</param>
/// <returns>'other' relative to 'facing'</returns>
public static RelativeDirection Cross(this CardinalDirection facing, CardinalDirection other)
{
return((RelativeDirection)facing.GetArcLinear(other));
}
