/// <summary>
/// Gets how much the constraint is being violated.
/// </summary>
/// <param name="constraint">The constraint.</param>
/// <param name="input">The function point.</param>
/// <returns>
/// How much the constraint is being violated at the given point. Positive
/// value means the constraint is not being violated with the returned slack,
/// while a negative value means the constraint is being violated by the returned
/// amount.
/// </returns>
public static double GetViolation(this IConstraint constraint, double[] input)
{
double fx = constraint.Function(input);
switch (constraint.ShouldBe)
{
case ConstraintType.EqualTo:
return(Math.Abs(fx - constraint.Value));
case ConstraintType.GreaterThanOrEqualTo:
return(fx - constraint.Value);
case ConstraintType.LesserThanOrEqualTo:
return(constraint.Value - fx);
}
throw new NotSupportedException();
}