public Pen Create(double length, double radius)
{
tube = _tubeFactory.Create(length, radius);
cap = _capFactory.Create(radius);
double lengthDelta = Math.Abs(tube.Length - length);
double radiusDelta = Math.Abs(tube.Radius - cap.Radius) / radius;
if (lengthDelta / length > 0.01)
{
throw new Exception($"Tube length delta {lengthDelta} exceed 1.0%");
}
if (radiusDelta > 0.005)
{
throw new Exception($"Radius tube delta {radiusDelta} exceed 0.5%");
}
return(new Pen(tube, cap));
}
public Pen(Tube tube, Cap cap)
{
Tube = tube;
Cap = cap;
}