\documentclass[full]{l3doc}
\usepackage[scheme=plain]{ctex}
\usepackage{enumitem}
\usepackage{indentfirst}
\usepackage{titling}
\usepackage{geometry}
\usepackage{fancyvrb-ex}
\usepackage{pascaltriangle}

\IndexPrologue
  {
    \section*{Index}
    \markboth{Index}{Index}
    \addcontentsline{toc}{section}{Index}
    The~italic~numbers~denote~the~pages~where~the~
    corresponding~entry~is~described,~
    numbers~underlined~point~to~the~definition,~
    all~others~indicate~the~places~where~it~is~used.
  }

\newcommand\tikzmark[1]{\tikz \coordinate[overlay, remember picture] (#1);}

\geometry{
  left=4.5cm,
  right=2cm,
  top=2cm,
  bottom=2cm,
}
\hypersetup {
  CJKbookmarks,
  bookmarksopen,
  bookmarksopenlevel=3,
  pdfstartview=FitH,
  pdfinfo = {
   Title = The package pascaltriangle ,
   Subject = A LaTeX3 package ,
   Author = Geng Nan
 }
}

\DoNotIndex{\begin, \end}
\setlength{\parskip}{\medskipamount}
\DeclareDocumentEnvironment { noteen } { +b } {
  \par\textbf{\textsf{NOTE:~}}#1\par
} {}
\DeclareDocumentEnvironment { notezh } { +b } {
  \par\textbf{\textsf{注意:~}}#1\par
} {}

\AtEndDocument{
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    bottom=2cm
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  \PrintIndex
}

\ExplSyntaxOn
\dim_new:N \l__my_syntax_dim
\box_new:N \g__my_syntax_box
\NewDocumentEnvironment { Syntax } { s }
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  {
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    #2
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} {  }

\keys_define:nn { pascal/doc } {
  opt .tl_set:N = \l_opt_tl,
  desc .tl_set:N = \l_desc_tl,
  init .tl_set:N = \l_init_tl,
  init .initial:n = init-none,
}

\box_new:N \l__option_box
\NewDocumentEnvironment { option } { m +b } {
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      \obeyspaces\obeylines
      \textcolor{red}{
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      }
      {~}\l_desc_tl
      \hfill(
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        { initially~\texttt{\l_init_tl} }
      )
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  \hbox_gset_end:
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  #2
  \medskip
} {  }

\DeclareDocumentCommand \opt { O{} m }
  { \__codedoc_cmd:no {#1} { #2 } }
\ExplSyntaxOff

\def\vers{\texttt{v1.0.1}
\thanks{\url{https://github.com/registor/pascaltriangle}}
\thanks{\url{https://gitee.com/nwafu_nan/pascaltriangle}}
}

\begin{document}
\title{
  \pkg{pascaltriangle} 宏包
  \rlap{\makebox[4cm][r]{
    \normalsize $\Longrightarrow$ \color{red}
    \protect\hyperlink{en}{English Version}
    \protect\hypertarget{zh}{}
  }}
}
\author{\textit{耿楠} \texttt{<nangeng@nwafu.edu.cn>}}
\date{\the\year 年\the\month 月\the\day 日\qquad \vers
}
\maketitle

{\small
\tableofcontents
}
\newpage

\begin{documentation}

\section{引言}
\pkg{pascaltriangle}是一个基于\pkg{TikZ}用\pkg{expl3}开发的
Pascal三角形(杨辉三角形)生成宏包，它提供了一个唯一的绘图命令
\tn{pascal}，并可以通过不同命令的命令选项或\tn{pascalset}命令
设置生成不同外观的等腰或直角Pascal三角形。

\section{用户接口}

\subsection{\cs{pascal}绘图命令}

\begin{function}{\pascal}
  \begin{syntax}
    \cs{pascal} \oarg{外观选项} \marg{层数}
  \end{syntax}

\end{function}

  用于绘制一个Pascal三角形。

  该命令仅有一个必选参数\marg{层数}，用于指定Pascal三角形的层数。

  在\oarg{外观选项}中可以通过key-value方式设置三角形形状、大小等外观。

  三角形的外观也可以通过\cs{pascalset}命令的逗号分隔key-value列表进行设置

\subsection{\cs{pascalset}}
\begin{function}{\pascalset}
  \begin{syntax}
    \cs{pascalset} \marg{外观选项}
  \end{syntax}

\end{function}

  用于设置一个Pascal三角形的外观。

  在\marg{外观选项}中可以通过key-value方式设置三角形形状、大小等外观。

\section{外观选项}

\begin{option}{ opt = shape, desc = {= \meta{形状}}, init=iso }
  设置Pascal三角形的形状，目前支持|iso|---等腰三角形和
  |rt|---直角三角形。
\end{option}\\
\begin{SideBySideExample}[frame=single,numbers=left,xrightmargin=.65\linewidth,gobble=2]
  \centering
  \pascal{5}\qquad
  \pascal[shape=rt]{5}
\end{SideBySideExample}

\bigskip

\begin{option}{ opt = radius, desc = {= \meta{半径}}, init=0.5cm }
  设置三角形每个单元外接圆半径，注意需要带有单位。
\end{option}\\
\begin{SideBySideExample}[frame=single,numbers=left,xrightmargin=.65\linewidth,gobble=2]
  \centering
  \pascal[radius=0.8cm]{5}
\end{SideBySideExample}

\bigskip

\begin{option}{ opt = fontsize, desc = {= \meta{字号命令}}, init=\cs{small} }
  设置三角形每个单元中数字文本大小。
\end{option}\\
\begin{SideBySideExample}[frame=single,numbers=left,xrightmargin=.65\linewidth,gobble=2]
  \centering
  \pascal[radius=0.8cm,
    fontsize=\Huge]{5}
\end{SideBySideExample}

\bigskip

\begin{option}{opt=withnum, desc={= \meta{布尔值}}, init=false}
    设置是否显示Pascal三角形的行列编号。
\end{option}\\
\begin{SideBySideExample}[frame=single,numbers=left,xrightmargin=.63\linewidth,gobble=2]
  \centering
  \pascal[withnum]{4}
  \pascal[withnum,shape=rt]{4}
\end{SideBySideExample}

\bigskip

\begin{option}{opt = binom, desc = {= \meta{布尔值}}, init=false}
  设置是否显示用二项式表达式显示各元素值。
\end{option}\\
\begin{SideBySideExample}[frame=single,numbers=left,xrightmargin=.63\linewidth,gobble=2]
  \centering
  \pascal[binom]{5}
  \pascal[binom,shape=rt]{5}
\end{SideBySideExample}

\bigskip

\begin{option}{ opt = fillr, desc = {= \meta{整数}}, init=1 }
  设置需要表示前列累加的单元格行号，注意行号是当前列自顶向下从0开始计数。
\end{option}

\begin{option}{ opt = fillc, desc = {= \meta{整数}}, init=1 }
  设置需要表示前列累加的单元格列号，注意列号是自左向右从0开始计数。
\end{option}\\
\begin{SideBySideExample}[frame=single,numbers=left,xrightmargin=.64\linewidth,gobble=2]
  \centering
  \pascalset{fillr=2,fillc=6,
             radius=0.4cm}
  \pascal{10}\\
  \pascal[shape=rt]{10}
\end{SideBySideExample}

\bigskip

\title{
  Package \pkg{pascaltriangle}
  \rlap{\makebox[4cm][r]{
    \normalsize $\Longrightarrow$ \color{red}
    \protect\hyperlink{zh}{中文版本}
    \protect\hypertarget{en}{}
  }}
}
\author{Nan Geng \texttt{<nangeng@nwafu.edu.cn>}}
\date{\today\qquad \vers}
\maketitle

\section{Introduction}

\pkg{pascaltriangle} is a Pascal triangle(Yanghui triangle) generation package
based on TikZ developed in expl3, which provides a unique drawing command \cs{pascal},
and can be set by different options or \cs{pascalset} macro to
generates isosceles or right-angle Pascal triangles with different appearances.

\section{Interfaces}

\subsection{\cs{pascal} macro}

\begin{function}{\pascal}
  \begin{syntax}
    \cs{pascal} \oarg{options} \marg{order}
  \end{syntax}
\end{function}
Used to draw a Pascal triangle.

This macro has only one mandatory parameter \marg{order},
which specifies the number of layers of the Pascal triangle.

In \oarg{options} you can set the appearance of the triangle shape,
size, etc. by key-value method.

The appearance of the triangle can also be set via the comma-separated
key-value list of the \cs{pascalset} macro

\subsection{\cs{pascalset} macro}

\begin{function}{\pascalset}
  \begin{syntax}
    \cs{pascalset} \marg{options}
  \end{syntax}
\end{function}

Used to set the appearance of Pascal triangle.

In \oarg{options} you can set the appearance of the triangle shape,
size, etc. by key-value method.

\section{options}

\begin{option}{ opt = shape, desc = {= \meta{shape}}, init=iso }
  Sets the shape of Pascal triangle
  currently supporting |iso|---isosceles triangles and |rt|---right-angle triangles.
\end{option}\\
\begin{SideBySideExample}[frame=single,numbers=left,xrightmargin=.65\linewidth,gobble=2]
  \centering
  \pascal{5}\qquad
  \pascal[shape=rt]{5}
\end{SideBySideExample}

\bigskip

\begin{option}{ opt = radius, desc = {= \meta{radius}}, init=0.5cm }
  Set the radius of the outer circle of each cell of the triangle,
  note that it needs to have units.
\end{option}\\
\begin{SideBySideExample}[frame=single,numbers=left,xrightmargin=.65\linewidth,gobble=2]
  \centering
  \pascal[radius=0.8cm]{5}
\end{SideBySideExample}

\bigskip

\begin{option}{ opt = fontsize, desc = {= \meta{fontsize}}, init=\cs{small} }
  Sets the fontsize of each cell of the triangle.
\end{option}\\
\begin{SideBySideExample}[frame=single,numbers=left,xrightmargin=.65\linewidth,gobble=2]
  \centering
  \pascal[radius=0.8cm,
    fontsize=\Huge]{5}
\end{SideBySideExample}

\bigskip

\begin{option}{opt=withnum, desc={= \meta{bool}}, init=false}
  Sets whether to show the Pascal triangle row/col numbers or not.
\end{option}\\
\begin{SideBySideExample}[frame=single,numbers=left,xrightmargin=.63\linewidth,gobble=2]
  \centering
  \pascal[withnum]{4}
  \pascal[withnum,shape=rt]{4}
\end{SideBySideExample}

\bigskip

\begin{option}{opt = binom, desc = {= \meta{bool}}, init=false}
  Sets whether to show each element value with binomial expressions or not.
\end{option}\\
\begin{SideBySideExample}[frame=single,numbers=left,xrightmargin=.63\linewidth,gobble=2]
  \centering
  \pascal[binom]{5}
  \pascal[binom,shape=rt]{5}
\end{SideBySideExample}

\bigskip

\begin{option}{ opt = fillr, desc = {= \meta{integer}}, init=1 }
  Set the row number of the cell that needs to indicate the sum of the pre-column,
  note that the row number is in the current column counted from the top down based 0.
\end{option}

\begin{option}{ opt = fillc, desc = {= \meta{integer}}, init=1 }
  Set the col number of the cell that needs to indicate the sum of the pre-column,
  note that the col number is counted from the left to right based 0.
\end{option}\\
\begin{SideBySideExample}[frame=single,numbers=left,xrightmargin=.64\linewidth,gobble=2]
  \centering
  \pascalset{fillr=2,fillc=6,
             radius=0.4cm}
  \pascal{10}\\
  \pascal[shape=rt]{10}
\end{SideBySideExample}

\end{documentation}


\end{document}