public bool IsParallel(Line line)
{
Vector firstLineDirectionVector = GetDirectionVector();
Vector secondLineDirectionVector = line.GetDirectionVector();
firstLineDirectionVector.Normalize(secondLineDirectionVector.GetLength());
if (!(firstLineDirectionVector - secondLineDirectionVector).IsZeroVector())
{
firstLineDirectionVector = firstLineDirectionVector * (-1.0);
}
Vector difference = firstLineDirectionVector - secondLineDirectionVector;
return(difference.IsZeroVector());
}