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\begin{tikzpicture}[font=\sffamily,>=latex]
\newcommand\Cs[1]{\texttt{\scriptsize\textbackslash #1}}
\sbox\mybox{\pgfinterruptpicture\sffamily\color{black!25}\scalebox{10}{Xy}\endpgfinterruptpicture}
\def\HEIGHT{\ht\mybox}
\def\WIDTH{\wd\mybox}
\def\DEPTH{\dp\mybox}
\draw [gray,thin]
(0,0) -- +(-3.5ex,0)
(0,\HEIGHT) -- +(-3.5ex,0)
(0,-\DEPTH) -- +(-3.5ex,0)
(\WIDTH,\HEIGHT) -- +(3.5ex,0)
(\WIDTH,-\DEPTH) -- +(3.5ex,0)
(0,-\DEPTH) -- +(0,-3.5ex)
(\WIDTH,-\DEPTH) -- +(0,-3.5ex)
;
\node [inner sep=0pt,anchor=base west] {\usebox\mybox};
\draw (0,0) -- (\WIDTH,0) node [above,midway] {baseline};
\draw [thick] (0,-\DEPTH) rectangle (\WIDTH,\HEIGHT);
\path [fill=white,draw=black] (0,0) circle (1pt);
\draw [<-,shorten <=2pt] (0,0) -- (2ex,-2ex) -- +(.5ex,0) node [right=-0.5ex] {origin};
\tikzset{inner sep=5pt}
\draw [->] (-2.5ex,0) -- +(0,-\DEPTH) node [pos=1.1,left,align=left]
{depth\\\Cs{depth}\\\Cs{dp}\Cs{br}};
\draw [->] (-2.5ex,0) -- +(0, \HEIGHT) node [pos=.4,left,align=left]
{height\\\Cs{height}\\\Cs{ht}\Cs{br}};
\draw [<->] (\WIDTH,-\DEPTH) ++(2.5ex,0) -- +(0,\DEPTH+\HEIGHT) node [midway,right,align=left]
{totalheight\\\Cs{totalheight}};
\draw [<->] (0,-\DEPTH) ++(0,-2.5ex) -- +(\WIDTH,0) node [midway,below,align=left]
{width\\\Cs{width}\\\Cs{wd}\Cs{br}};
\fill (-2.5ex,0) circle (.5pt);
\path let
\p1 = (current bounding box.south west),
\p2 = (current bounding box.north east),
\p3 = (0,-\DEPTH),
\p4 = (\WIDTH,\HEIGHT)
in
(\x3-\x2+\x4,\y3) rectangle (\x4+\x3-\x1,\y4);
\end{tikzpicture}
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