/// <summary>
/// Compute the clockwise angle of the vector pointing from b to a
/// </summary>
/// <param name="a"></param>
/// <param name="b"></param>
/// <returns></returns>
public static float AngleBetweenPoints(Vector2D a, Vector2D b)
{
Vector2D bToA = a - b;
bToA.Normalize();
return(bToA.ToAngle());
}
