/// <summary>
/// Implements the - operator.
/// </summary>
/// <param name="a">a.</param>
/// <param name="b">The b.</param>
/// <returns>The result of the operator.</returns>
/// <exception cref="ArgumentException">Stiffnesses must both be in local coordinate systems in order to be subtracted from each other.</exception>
public static Stiffness operator -(Stiffness a, Stiffness b)
{
if (a == null)
{
return(b);
}
if (b == null)
{
return(a);
}
if (!a.IsLocalCoordinateSystem || !b.IsLocalCoordinateSystem)
{
throw new ArgumentException("Stiffnesses must both be in local coordinate systems in order to be subtracted from each other.");
}
Stiffness stiffness = new Stiffness()
{
U1 = a.U1 - b.U1,
U2 = a.U2 - b.U2,
U3 = a.U3 - b.U3,
R1 = a.R1 - b.R1,
R2 = a.R2 - b.R2,
R3 = a.R3 - b.R3
};
return(stiffness);
}
/// <summary>
/// Implements the + operator.
/// </summary>
/// <param name="a">a.</param>
/// <param name="b">The b.</param>
/// <returns>The result of the operator.</returns>
/// <exception cref="ArgumentException">Stiffnesses must both be in local coordinate systems in order to be added together.</exception>
public static Stiffness operator +(Stiffness a, Stiffness b)
{
if (a == null)
{
return(b);
}
if (b == null)
{
return(a);
}
if (!a.IsLocalCoordinateSystem || !b.IsLocalCoordinateSystem)
{
throw new ArgumentException("Stiffnesses must both be in local coordinate systems in order to be added together.");
}
Stiffness stiffness = new Stiffness()
{
U1 = a.U1 + b.U1,
U2 = a.U2 + b.U2,
U3 = a.U3 + b.U3,
R1 = a.R1 + b.R1,
R2 = a.R2 + b.R2,
R3 = a.R3 + b.R3
};
return(stiffness);
}