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+%% rulerbox.sty
+%% Copyright 2019 Yuchang Yang < yang.yc.allium@gmail.com >
+%
+% This work may be distributed and/or modified under the
+% conditions of the LaTeX Project Public License, either version 1.3
+% of this license or (at your option) any later version.
+% The latest version of this license is in
+%   http://www.latex-project.org/lppl.txt
+% and version 1.3 or later is part of all distributions of LaTeX
+% version 2005/12/01 or later.
+%
+% This work has the LPPL maintenance status `maintained'.
+% 
+% The Current Maintainer of this work is Yuchang Yang.
+%
+% This work consists of the files rulerbox.sty, rulerbox.tex and 
+% the generated manual file rulerbox.pdf.
+%%
+\NeedsTeXFormat{LaTeX2e}
+\ProvidesPackage{rulerbox}[2019/04/18 v1.01 package rulerbox]
+\makeatletter
+\def\vb@xt@{\vbox to}
+\newdimen\rulerunit
+         \rulerunit=1mm
+\newdimen\rulerwidth
+         \rulerwidth=7pt
+\newdimen\rulersep
+         \rulersep=3pt
+\newdimen\rtickrule
+         \rtickrule=.4pt
+\newdimen\dim@margin
+\newdimen\dim@total@height
+\newdimen\dim@depth
+\def\ruler@vcells#1#2{%
+    \leaders\vb@xt@#1\rulerunit{%
+        \kern-.5\rtickrule
+        \hrule\@height\rtickrule\@width#2\rulerwidth
+        \vss}%
+    \vfill\kern-#1\rulerunit}
+\def\ruler@hcells#1#2{%
+    \leaders\hb@xt@#1\rulerunit{%
+        \kern-.5\rtickrule
+        \vrule\@width\rtickrule\@height#2\rulerwidth
+        \hss}%
+    \hfill\kern-#1\rulerunit}
+\newif\ifrulertop
+        \rulertoptrue
+\newif\ifrulerbottom
+        \rulerbottomtrue
+\newif\ifrulerleft
+        \rulerlefttrue
+\newif\ifrulerright
+        \rulerrighttrue
+\newif\ifruler@t
+\newif\ifruler@b
+\newif\ifruler@l
+\newif\ifruler@r
+\newbox\box@content
+\newbox\box@ruler@left
+\newbox\box@ruler@right
+\newbox\box@ruler@top
+\newbox\box@ruler@bottom
+\def\rulerbox{%
+    \let\ifruler@t\ifrulertop
+    \let\ifruler@b\ifrulerbottom
+    \let\ifruler@l\ifrulerleft
+    \let\ifruler@r\ifrulerright
+    \@ifnextchar[%]
+    {\ruler@box@option}{\ruler@box}}
+\def\ruler@box@option[#1]{%
+    \ruler@tfalse
+    \ruler@bfalse
+    \ruler@lfalse
+    \ruler@rfalse
+    \@tfor\@iterator:=#1\do{\csname ruler@\@iterator true\endcsname}%
+    \ruler@box}
+\long\def\ruler@box#1{%
+    \leavevmode
+    \setbox\box@content=\hbox{#1}%
+    \dim@margin=\rulerwidth
+        \advance\dim@margin\rulersep
+    \dim@total@height=\ht\box@content
+        \advance\dim@total@height\dp\box@content
+    \dim@depth=\dp\box@content
+        \ifruler@b
+            \advance\dim@depth\dim@margin
+        \fi
+    \rulers@prepare
+    \ruler@box@
+}
+\def\rulers@prepare{%
+    \ifruler@l\setbox\box@ruler@left=\hbox{\lower\dp\box@content\hbox{%
+        \ooalign{%
+                      \vb@xt@\dim@total@height{\ruler@vcells{10}{1.  }}\cr
+            \hidewidth\vb@xt@\dim@total@height{\ruler@vcells{ 5}{ .75}}\cr
+            \hidewidth\vb@xt@\dim@total@height{\ruler@vcells{ 1}{ .5 }}\cr
+        }%
+    }}\fi%
+    \ifruler@r\setbox\box@ruler@right=\hbox{\lower\dp\box@content\hbox{%
+        \ooalign{%
+            \vb@xt@\dim@total@height{\ruler@vcells{10}{1.  }}\cr
+            \vb@xt@\dim@total@height{\ruler@vcells{ 5}{ .75}}\hidewidth\cr
+            \vb@xt@\dim@total@height{\ruler@vcells{ 1}{ .5 }}\hidewidth\cr
+        }%
+    }}\fi%
+    \ifruler@t\setbox\box@ruler@top=\hbox{%
+        \ooalign{%
+            \hb@xt@\wd\box@content{\ruler@hcells{10}{1   }}\cr
+            \hb@xt@\wd\box@content{\ruler@hcells{ 5}{ .75}}\cr
+            \hb@xt@\wd\box@content{\ruler@hcells{ 1}{ .5 }}\cr
+        }%
+    }\fi%
+    \ifruler@b\setbox\box@ruler@bottom=\hbox{%
+        \ooalign{%
+            \vb@xt@\rulerwidth{\hb@xt@\wd\box@content{\ruler@hcells{10}{1   }}\vss}\cr
+            \vb@xt@\rulerwidth{\hb@xt@\wd\box@content{\ruler@hcells{ 5}{ .75}}\vss}\cr
+            \vb@xt@\rulerwidth{\hb@xt@\wd\box@content{\ruler@hcells{ 1}{ .5 }}\vss}\cr
+        }%
+    }\fi}
+\def\ruler@box@{%
+    \lower\dim@depth\hbox{%
+        \ifruler@l\kern\dim@margin\fi
+        \vbox{%
+            \ifruler@t
+                \box\box@ruler@top
+                \nointerlineskip
+                \kern\rulersep
+            \fi
+            \hbox{%
+                \ifruler@l
+                    \kern-\dim@margin
+                        \box\box@ruler@left
+                    \kern\rulersep
+                \fi
+                \box\box@content
+                \ifruler@r
+                    \kern\rulersep
+                        \box\box@ruler@right
+                    \kern-\dim@margin
+                \fi
+            }%
+            \ifruler@b
+                \nointerlineskip
+                \kern\rulersep
+                \box\box@ruler@bottom
+            \fi
+            \kern\z@
+        }%
+        \ifruler@r\kern\dim@margin\fi
+    }}
+\makeatother
+%%
+%% End of file `rulerbox.sty'