/// <summary>
/// Initialises an angle as the signed difference between two directions in the 2D plane.
/// The returned value is the smallest negative angle from one direction to the other.
/// </summary>
public static Angle BetweenNegative(Direction2 from, Direction2 to)
{
var a = Angle.Between(from, to);
if (a.radians > 0)
{
a -= Mathf.TwoPi.Radians();
}
return(a);
}
/// <summary>
/// Initialises an angle as the signed difference between two directions in the 2D plane.
/// The returned value is the smallest possible angle from one direction to the other.
/// </summary>
public static Angle Between(Direction2 from, Direction2 to)
{
return(to - from);
}