不使用 TikZ 等的函數圖符號

Question

在一本美國教科書中，我在練習編號附近看到了這個洋紅色符號，我非常喜歡它，它代表了笛卡爾參考系統中函數的通用圖形。

我做了一些研究，但我認為沒有任何包可以在沒有TikZ-pgf.這是我的 MWE，沒有進入網格的曲線。

\documentclass[a4paper,12pt]{article}
\usepackage{xcolor}
\usepackage{amssymb}
\usepackage{relsize}
\begin{document}
$\textcolor{magenta}{\mathlarger{\boxplus}}$
\end{document}

我還沒有找到與該符號重疊的曲線符號。

Answer 1

您可以使用pict2e：

\documentclass{article}
\usepackage{xcolor,pict2e}

\newcommand{\usegraph}{%
  \begingroup\setlength{\unitlength}{0.16pt}%
  \begin{picture}(100,100)
  \color{magenta}
  \polygon(0,0)(100,0)(100,100)(0,100)
  \Line(50,0)(50,100)
  \Line(0,50)(100,50)
  \cbezier(0,0)(60,200)(40,0)(100,100)
  \end{picture}%
  \endgroup
}

\begin{document}

\usegraph

\end{document}

曲線較粗的版本：

\documentclass{article}
\usepackage{xcolor,pict2e}

\newcommand{\usegraph}{%
  \begingroup\setlength{\unitlength}{0.16pt}%
  \begin{picture}(100,100)
  \color{magenta}
  \polygon(0,0)(100,0)(100,100)(0,100)
  \Line(50,0)(50,100)
  \Line(0,50)(100,50)
  \linethickness{0.8pt}
  \cbezier(1,0)(60,200)(40,0)(99,100)
  \end{picture}%
  \endgroup
}

\begin{document}

\usegraph

\end{document}

使用（相當新的）l3draw包。

\documentclass{article}
\usepackage{xparse,l3draw,xcolor}

\ExplSyntaxOn

\NewDocumentCommand{\usegraph}{O{16pt}}
 {
  \raisebox{0pt}[#1][0pt]{\color{magenta}\egreg_usegraph:n { #1 }}
 }

\dim_new:N \l__egreg_usegraph_size_dim

\cs_new_protected:Nn \egreg_usegraph:n
 {
  \dim_set:Nn \l__egreg_usegraph_size_dim { #1 }
  \draw_begin:
  \draw_linewidth:n { 0.025*(#1) }
  \draw_path_moveto:n { 0\l__egreg_usegraph_size_dim , 0\l__egreg_usegraph_size_dim }
  \draw_path_lineto:n { 1\l__egreg_usegraph_size_dim , 0\l__egreg_usegraph_size_dim }
  \draw_path_lineto:n { 1\l__egreg_usegraph_size_dim , 1\l__egreg_usegraph_size_dim }
  \draw_path_lineto:n { 0\l__egreg_usegraph_size_dim , 1\l__egreg_usegraph_size_dim }
  \draw_path_close:
  \draw_path_use_clear:n { stroke }
  \draw_path_moveto:n { 0.5\l__egreg_usegraph_size_dim , 0\l__egreg_usegraph_size_dim }
  \draw_path_lineto:n { 0.5\l__egreg_usegraph_size_dim , 1\l__egreg_usegraph_size_dim }
  \draw_path_use_clear:n { stroke }
  \draw_path_moveto:n { 0\l__egreg_usegraph_size_dim , 0.5\l__egreg_usegraph_size_dim }
  \draw_path_lineto:n { 1\l__egreg_usegraph_size_dim , 0.5\l__egreg_usegraph_size_dim }
  \draw_path_use_clear:n { stroke }
  \draw_linewidth:n { 0.05*(#1) }
  \draw_path_moveto:n { 0.01\l__egreg_usegraph_size_dim , 0\l__egreg_usegraph_size_dim }
  \draw_path_curveto:nnn 
    { 0.6\l__egreg_usegraph_size_dim , 2\l__egreg_usegraph_size_dim }
    { 0.4\l__egreg_usegraph_size_dim , 0\l__egreg_usegraph_size_dim }
    { 0.99\l__egreg_usegraph_size_dim , 1\l__egreg_usegraph_size_dim }
  \draw_path_use_clear:n { stroke }
  \draw_end:
 }

\ExplSyntaxOff

\begin{document}

\usegraph\quad\usegraph[1em]\quad\usegraph[30pt]

\end{document}