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+% \iffalse
+% --------------------------------------------------------------------
+%<*chit>
+% \fi
+%
+% \subsubsection{Predefined \texttt{chit} element pictures}
+%
+% \begin{TikzKey}{/tikz/pics/chit/1 factor,
+% /tikz/pics/chit/2 factors,
+% /tikz/pics/chit/2 factors artillery,
+% /tikz/pics/chit/3 factors,
+% /tikz/pics/chit/4 factors,
+% /tikz/pics/chit/identifier,
+% /tikz/pics/chit/small identifier,
+% /tikz/pics/chit/identifier macro}
+%
+% These pictures can be used as the value of \texttt{chit} keys.
+%
+% \begin{macrocode}
+\tikzset{%
+ chit/1 factor/.pic={
+ \chit@dbg{4}{ Chit 1 factor: #1}%
+ \node[chit/factor,chit/1 factor,pic actions]{#1};},
+ pics/chit/2 factors/.style args={#1,#2}{%
+ code={%
+ \chit@dbg{4}{ Chit 2 factors: #1 and #2}%
+ \node[chit/factor,chit/2 factors,pic actions]{#1--#2};}},
+ pics/chit/2 factors artillery/.style args={#1,#2,#3}{%
+ code={
+ \chit@dbg{4}{ Chit 2 factors w/artillery: `#1' `#2' `#3'}%
+ \node[chit/factor,chit/2 factors,pic actions]{%
+ #1$\overset{\text{\scriptsize #3}}{\text{--}}$#2};}},
+ pics/chit/3 factors/.style args={#1,#2,#3}{%
+ code={
+ \chit@dbg{4}{ Chit 3 factors: `#1' `#2' `#3'}%
+ \node[chit/factor,chit/3 factors,pic actions]{#1-#2-#3};}},
+ pics/chit/4 factors/.style args={#1,#2,#3,#4}{%
+ code={
+ \chit@dbg{4}{ Chit 3 factors: `#1' `#2' `#3' `#4'}%
+ \node[chit/factor,chit/4 factors,pic actions]{#1-#2-#3-#4};}},
+ chit/identifier/.pic={
+ \chit@dbg{4}{ Chit identifier: `#1'}%
+ \node[chit/identifier,pic actions]{#1};
+ },
+ chit/small identifier/.pic={
+ \chit@dbg{4}{ Chit small identifier: `#1'}%
+ \node[chit/small identifier,pic actions]{#1};
+ },
+ chit/identifier macro/.pic={%
+ \chit@dbg{4}{ Chit identifier macro: \meaning#1}
+ \edef\chit@i@tmp{#1}
+ \node[chit/identifier,pic actions]{\chit@i@tmp};},
+}
+% \end{macrocode}
+% \end{TikzKey}
+%
+% \begin{TikzKey}{/tikz/chit/factor,
+% /tikz/chit/1 factor,
+% /tikz/chit/2 factors,
+% /tikz/chit/3 factors,
+% /tikz/chit/4 factors,
+% /tikz/chit/identifier,
+% /tikz/chit/small identifier}
+%
+% Styles used by the above pictures. Users can change these as they
+% see fit.
+%
+% \begin{macrocode}
+\tikzset{%
+ chit/factor/.style={
+ shape=rectangle,
+ font=\sffamily\bfseries\large,
+ anchor=base,
+ inner sep=0,
+ %text=pgfstrokecolor,
+ draw=none,
+ fill=none,
+ },
+ chit/1 factor/.style={},
+ chit/2 factors/.style={},
+ chit/3 factors/.style={},
+ chit/4 factors/.style={text/.append style=\small},
+ chit/identifier/.style={
+ shape=rectangle,
+ font=\sffamily\bfseries\scriptsize,
+ inner sep=0,
+ % text=pgfstrokecolor,
+ draw=none,
+ fill=none,
+ },
+ chit/small identifier/.style={
+ shape=rectangle,
+ font=\sffamily\bfseries\tiny,
+ inner sep=0,
+ % text=pgfstrokecolor,
+ draw=none,
+ fill=none,
+ },
+}
+% \end{macrocode}
+% \end{TikzKey}
+% \iffalse
+%</chit>
+% --------------------------------------------------------------------
+% \fi