/// <summary>
/// Create List of pattern flipped/mirrored/rotated
/// <para>Tạo ra các pattern được flip/mirror/rotate, rồi bỏ tất cả vào 1 List, trả về List</para>
/// </summary>
public static List <PatternShape> Sym8(this PatternShape ps)
{
var result = new List <PatternShape>();
var ps2 = ps.CopyByFlipMainDiagonal();
result.Add(ps);
result.Add(ps.CopyByFlipVertical());
result.Add(ps.CopyByFlipHorizontal());
result.Add(ps.CopyByFlipSubDiagonal());
result.Add(ps2);
result.Add(ps2.CopyByFlipVertical());
result.Add(ps2.CopyByFlipHorizontal());
result.Add(ps2.CopyByFlipSubDiagonal());
return(result);
}
