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%% This is file 'tikz-bagua.sty'
%%
%% Developed by Xu Wang
%% Copyright (C) 2021 by Xu Wang <cwangx@hotmail.com>
%%
%% It may be distributed and/or modified under the conditions of
%% the LaTeX Project Public License (LPPL).
%%
\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{bagua}[2021/10/17 v1.0 draw Bagua in Yijing via tikz package]

\RequirePackage{tikz}
\RequirePackage{xstring}
\RequirePackage{bitset}
\RequirePackage{xparse}
\RequirePackage{xintexpr}

%%\taiji[<scale>]
\newcommand\taiji[1][0.816]{% taiji yinyang
	\begin{tikzpicture}[baseline=-0.3em,scale=#1]
		\draw (0,0) circle (0.5em);
		\fill (0,-0.5em) arc (270:90:0.25em) arc (-90:90:0.25em) arc (90:270:0.5em);
		\fill (0,-0.25em) circle (0.05em);
		\fill [fill=white] (0,0.25em) circle (0.05em);
	\end{tikzpicture}%
}

%%\drawliangyi[<yshift>]{<0 or 1>}
\newcommand\drawliangyi[2][0]{%
	\ifnum #2=0 \draw (0,#1) -- (1em/3,#1) (2em/3,#1) -- (1em,#1)%;%
	\else%
		\ifnum #2=1 \draw (0,#1) -- (1em,#1)%;%
		\else \node {Error!}%
		\fi%
	\fi%
}

%%\liangyi{<0 or 1>}[<scale>]
\NewDocumentCommand\liangyi{mO{1}}{%
	\IfInteger{#1}{%
		\xintifboolexpr{#1 = 0 || #1 = 1}{%
			\begin{tikzpicture}[baseline=-0.3em,scale=#2]%
				\drawliangyi{#1};%
		\end{tikzpicture}}{\@latex@error{Error! Please check whether \#1 is 0 or 1.}{}}%
	}{\@latex@error{Error! Please check whether \#1 is integer.}{}}%
}

%%\sixiang{<binary>}[<scale>]
%%\sixiang*{<decimal>}[<scale>]
\NewDocumentCommand\sixiang{smO{1}}{% \sixiang{11}=\sixiang*{3}
	\IfInteger{#2}{% begin of if #2 is an integer
		\IfBooleanTF#1%
		{\xintifboolexpr{#2 >= 0 && #2 < 4}% begin of If a star is seen
			{\bitsetSetDec{sixiangdec}{#2}%
				\begin{tikzpicture}[baseline=-0.5em,scale=#3]%[baseline=-0.225em] 
					\foreach \j in {1,0}
					{
						\drawliangyi[-\j*0.408em]{\bitsetGet{sixiangdec}{\j}};
					}
			\end{tikzpicture}}{\@latex@error{Error! Please check whether 0<=\#1<4.}{}}%
		}% end of If a star is seen
		{\StrLen{#2}[\lengthforbinary]%begin of binary
			\xintifboolexpr{\lengthforbinary=1 || \lengthforbinary=2}{%
				\bitsetSetBin{sixiangbin}{#2}%
				\begin{tikzpicture}[baseline=-0.5em,scale=#3]%[baseline=-0.225em]
					\foreach \j in {1,0}
					{
						\drawliangyi[-\j*0.408em]{\bitsetGet{sixiangbin}{\j}};
					}
				\end{tikzpicture}%
			}{\@latex@error{Error! Please check whether 0<=\#1<=11.}{}}%end of binary
		}%     If no star is seen
	}% end of if #2 is an integer
	{\@latex@error{Error! Please check whether \#1 is integer.}{}}% else #2 is not an integer
}

%%\bagua{<binary>}[<scale>]
%%\bagua*{<decimal>}[<scale>]
\NewDocumentCommand\bagua{smO{1}}{% \bagua{101}=\bagua*{5}
	\IfInteger{#2}{% begin of if #2 is an integer
		\IfBooleanTF#1%
		{%% begin of If a star is seen
			\bitsetSetDec{baguadec}{#2}%
			\xintifboolexpr {#2 >= 0 && #2 <8}
			{%
				\begin{tikzpicture}[baseline=-0.714em,scale=#3]
					\foreach \j in {2,1,0}
					{
						\drawliangyi[-\j*0.408em]{\bitsetGet{baguadec}{\j}};
					}
				\end{tikzpicture}%
			}%
			{\@latex@error{Error! Please check whether 0<=\#1<8.}{}}%
		}%% end of If a star is seen
		{%% begin of If no star is seen
			\bitsetSetBin{baguabin}{#2}%
			\StrLen{#2}[\lengthforbinary]%
			\xintifboolexpr{\lengthforbinary > 0 && \lengthforbinary <4}%
			{%
				\begin{tikzpicture}[baseline=-0.714em,scale=#3]
					\foreach \j in {2,1,0}
					{
						\drawliangyi[-\j*0.408em]{\bitsetGet{baguabin}{\j}};
					}
				\end{tikzpicture}%
			}%
			{\@latex@error{Error! Please check whether 0<=\#1<1000.}{}}%
		}%% end of If no star is seen
	}% end of if #2 is an integer
	{\@latex@error{Error! Please check whether \#1 is integer.}{}}% else #2 is not an integer
}

%%\Bagua[<2 default, 8>]{<binary, octal>}[<scale>]
%%\Bagua*{<decimal>}[<scale>]
\NewDocumentCommand\Bagua{sO{2}mO{1}}{% \bagua{101110}=\bagua[8]{56}=\bagua*{46}
	\IfInteger{#3}{% begin of if #3 is an integer
		\IfBooleanTF#1%
		{%% begin of If a star is seen
			\bitsetSetDec{baguadec}{#3}%
			\xintifboolexpr {#3 >= 1 && #3 <64}%
			{%
				\begin{tikzpicture}[baseline=-0.714em,scale=#4]
					\foreach \j in {5,4,...,0}
					{
						\drawliangyi[-\j*0.1632em]{\bitsetGet{baguadec}{\j}};
					}
				\end{tikzpicture}%
			}{\@latex@error{Error! Please check whether 0<=\#2<64.}{}}%
		}%% end of If a star is seen
		{%% begin of If no star is seen
			\ifnum#2=2%
			\bitsetSetBin{baguabin}{#3}%
			\StrLen{#3}[\lengthforbinary]%
			\xintifboolexpr{\lengthforbinary >= 1 && \lengthforbinary <7}%
			{%
				\begin{tikzpicture}[baseline=-0.714em,scale=#4]
					\foreach \j in {5,4,...,0}
					{
						\drawliangyi[-\j*0.1632em]{\bitsetGet{baguabin}{\j}};
					}
				\end{tikzpicture}%
			}{\@latex@error{Error! Please check whether 0<=\#2<1000000.}{}}%
			\else%
			\ifnum#2=8%
			\bitsetSetOct{baguaoct}{#3}%
			\StrLen{#3}[\lengthforoct]%
			\xintifboolexpr{\lengthforoct =1 || \lengthforoct =2}%
			{%
				\begin{tikzpicture}[baseline=-0.714em,scale=#4]
					\foreach \j in {5,4,...,0}
					{
						\drawliangyi[-\j*0.1632em]{\bitsetGet{baguaoct}{\j}};
					}%
				\end{tikzpicture}%
			}{\@latex@error{Error! Please check whether 0<=\#2<100.}{}}%
			\else{\@latex@error{Error! Please check whether \#1 is default (2) or 8.}{}}\fi%
			\fi%
		}%% end of If no star is seen
	}% end of if #3 is an integer
	{\@latex@error{Error! Please check whether \#2 is integer.}{}}% else #3 is not an integer
}

\endinput
%%
%% End of file 'tikz-bagua.sty'