/// <summary>
/// Get a trigram from its painting.
/// </summary>
/// <param name="卦画">
/// The painting.
/// Its property <see cref="卦画.爻数"/> should be 3.
/// </param>
/// <param name="result">The trigram.</param>
/// <returns>A value indicates whether the trigram has been found or not.</returns>
/// <exception cref="ArgumentNullException"> <paramref name="卦画"/> is null.</exception>
public static bool 获取经卦(卦画 卦画, [NotNullWhen(true)] out 经卦?result)
{
if (卦画 is null)
{
throw new ArgumentNullException(nameof(卦画));
}
if (卦画.爻数 != 3)
{
result = null;
return(false);
}
int index = default;
using (var ms = new MemoryStream(Properties.Resources.经卦卦画对照))
{
var b = 卦画.ToByte();
for (int i = 0; i < 8; i++)
{
if (ms.ReadByte() == b)
{
index = i;
break;
}
}
}
result = new 经卦(index, 获取卦名(index), 获取卦对应的自然现象(index), 卦画);
return(true);
}
internal 经卦(int index, char 卦名, char 自然现象, 卦画 卦画)
{
this.Index = index;
this.卦名 = 卦名;
this.自然属性 = 自然现象;
阴阳[] 各爻阴阳 = 卦画.ToArray();
this.初爻阴阳 = 各爻阴阳[0];
this.中爻阴阳 = 各爻阴阳[1];
this.爻阴阳 = 各爻阴阳[2];
}
/// <summary>
/// Convert from a <see cref="string"/> .
/// </summary>
/// <param name="s">
/// The string represents the painting.
/// </param>
/// <param name="result">The painting.</param>
/// <returns>A value indicates whether it has been successfully converted or not.</returns>
/// <exception cref="ArgumentNullException"> <paramref name="s"/> is null.</exception>
public static bool TryParse(string s, [NotNullWhen(true)] out 卦画?result)
{
if (s == null)
{
throw new ArgumentNullException(nameof(s));
}
List <阴阳> r = new List <阴阳>(6);
foreach (var c in s)
{
if (c < '0' || c > '9')
{
result = null;
return(false);
}
r.Add(c % 2 == 0 ? 阴阳.阴 : 阴阳.阳);
}
result = new 卦画(r.ToArray());
return(true);
}
/// <summary>
/// Get a hexagram from its painting.
/// </summary>
/// <param name="卦画">
/// The painting.
/// Its property <see cref="卦画.爻数"/> should be 6.
/// </param>
/// <param name="result">The hexagram.</param>
/// <returns>A value indicates whether the hexagram has been found or not.</returns>
/// <exception cref="ArgumentException"> <see cref="卦画.爻数"/> of <paramref name="卦画"/> isn't 6.</exception>
/// <exception cref="ArgumentNullException"> <paramref name="卦画"/> is null.</exception>
public static bool 获取别卦(卦画 卦画, [NotNullWhen(true)] out 别卦?result)
{
if (卦画 is null)
{
throw new ArgumentNullException(nameof(卦画));
}
if (卦画.爻数 != 6)
{
result = null;
return(false);
}
经卦.获取经卦(new 卦画(false, 卦画[0], 卦画[1], 卦画[2]), out 经卦? 主卦);
Debug.Assert(主卦 is not null);
经卦.获取经卦(new 卦画(false, 卦画[3], 卦画[4], 卦画[5]), out 经卦? 客卦);
Debug.Assert(客卦 is not null);
return(获取别卦(主卦, 客卦, out result));
}
