/// <summary>
/// 获取变卦卦画。
/// Get the changed painting.
/// </summary>
/// <param name="from">
/// 要变换的卦画。
/// The painting to derive from.
/// </param>
/// <param name="indexesOfTheChangingLines">
/// 变爻的序号。从零开始计。
/// The indexes of the changing lines, starting from zero.
/// </param>
/// <returns>
/// 变换结果。
/// The derived painting.
/// </returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="from"/> 或 <paramref name="indexesOfTheChangingLines"/> 是 <c>null</c>.
/// <paramref name="from"/> or <paramref name="indexesOfTheChangingLines"/> is <c>null</c>.
/// </exception>
public static Core.Painting ChangeLines(
this Core.Painting from, IEnumerable <int> indexesOfTheChangingLines)
{
if (from is null)
{
throw new ArgumentNullException(nameof(from));
}
if (indexesOfTheChangingLines is null)
{
throw new ArgumentNullException(nameof(indexesOfTheChangingLines));
}
var derivation = new ChangingDerivation(indexesOfTheChangingLines);
return(derivation.Derive(from));
}
static void Main(string[] args)
{
#region to derive from a painting
_ = Painting.TryParse("110000", out Painting painting);
Debug.Assert(painting is not null);
// Traditionally:
IDerivation derivation = new OverturningDerivation();
Console.WriteLine($"110000 -o> {derivation.Derive(painting)}");
Console.WriteLine();
// Output: 110000 -o> 000011
derivation = new ChangingDerivation(3, 4);
Console.WriteLine($"110000 -c> {derivation.Derive(painting)}");
Console.WriteLine();
// Output: 110000 -c> 110110
derivation = new FunctionDerivation((painting) =>
{
return(new Painting(painting.Select((_, _) => YinYang.Yang)));
});
// This derivation will turn all the lines to yang lines.
Console.WriteLine($"110000 -f> {derivation.Derive(painting)}");
Console.WriteLine();
// Output: 110000 -f> 111111
// With extension methods:
Console.WriteLine($"110000 -o2> {painting.ToOverlapping()}");
Console.WriteLine();
// Output: 110000 -o2> 100000
Console.WriteLine($"110000 -o2> " +
$"{painting.ApplyDerivation((_) => new Painting(YinYang.Yang))}");
Console.WriteLine();
// Output: 110000 -o2> 1
#endregion
#region to compare two paintings
_ = Painting.TryParse("110000", out Painting painting1);
_ = Painting.TryParse("000011", out Painting painting2);
_ = Painting.TryParse("111111", out Painting painting3);
Debug.Assert(painting1 is not null && painting2 is not null);
// Traditionally:
IComparer <bool> comparer = new OverlappingComparer();
Console.WriteLine(comparer.Compare(painting1, painting2));
Console.WriteLine();
// Output: False
comparer = new OverturningComparer();
Console.WriteLine(comparer.Compare(painting1, painting2));
Console.WriteLine();
// Output: True
comparer = new FunctionComparer(derivation);
// The current derivation will turn all the lines to yang lines,
// and now the compare will check that.
Console.WriteLine($"{comparer.Compare(painting1, painting3)} " +
$"{comparer.Compare(painting3, painting1)}");
Console.WriteLine();
// Output: True False
// With extension methods:
Console.WriteLine(painting1.IsOverturnedFrom(painting2));
Console.WriteLine();
// Output: True
foreach (var lineIndex in painting1.GetDifferentLinesBetween(painting2))
{
Console.Write(lineIndex);
}
Console.WriteLine();
Console.WriteLine();
// Output: 0145
#endregion
}