internal Direction(
IAlgebraicNumberCalculator <TAlgebraicNumber> calculator,
TAlgebraicNumber x,
TAlgebraicNumber y)
{
if (calculator is null)
{
throw new ArgumentNullException(nameof(calculator));
}
if (x is null)
{
throw new ArgumentNullException(nameof(x));
}
if (y is null)
{
throw new ArgumentNullException(nameof(y));
}
if (calculator.IsZero(x) && calculator.IsZero(y))
{
throw new ArgumentException(
"Both components of the direction cannot be simultaneously zero.",
nameof(y));
}
_calculator = calculator;
X = x;
Y = y;
}
public static bool AreEqual <TAlgebraicNumber>(
this IAlgebraicNumberCalculator <TAlgebraicNumber> calculator,
TAlgebraicNumber number1,
TAlgebraicNumber number2)
{
if (calculator is null)
{
throw new ArgumentNullException(nameof(calculator));
}
return(calculator.IsZero(calculator.Subtract(number2, number1)));
}
/// <inheritdoc />
public override bool Equals(object?other)
{
if (other is null)
{
return(false);
}
if (ReferenceEquals(this, other))
{
return(true);
}
if (other is Direction <TAlgebraicNumber> direction)
{
return(_calculator.IsZero(Determinant(direction)) &&
_calculator.IsStrictlyPositive(
_calculator.Add(
_calculator.Multiply(X, direction.X),
_calculator.Multiply(Y, direction.Y))));
}
return(false);
}