Add forest/tree example

chapters/mainmatter/floats.tex

@@ -518,6 +518,7 @@ \section{TikZ and pgfplots}
 A select few are presented here.
 
 \subsection{Drawing over Bitmaps}
+
 When having to rely on bitmaps, one might still want to add additional info.
 This can be done directly in \LaTeX{}, profiting from all the usual features.
 In the example here, this is of course the retaining of the text font, but also
@@ -607,6 +608,86 @@ \subsection{Drawing over Bitmaps}
  }
 \end{figure}
 
+\subsection{Trees}
+
+Drawing trees is possible with \ctanpackage{forest}, see \cref{fig:tree}.
+It is a very easy package to get started with.
+Take a look at the source code.
+It is deceivingly simple, but also highly customizable.
+Note that the package is stand\-/alone, but uses Ti\textit{k}Z under the hood
+(like a lot of packages do).
+\begin{figure}
+ \ffigbox[\textwidth]{% forest does not work with \FBwidth (?)
+ \caption{Example for a tree}
+ \label{fig:tree}
+ }{
+ \footnotesize
+ \begin{forest}
+ forked edges,% Instead of direct connections, draw edges
+ for tree={%
+ grow'=east,
+ anchor=west,
+ where level=0{}{calign=first},% works like {if}{else}
+ %
+ % Put all nodes of same level onto same tier also, aligning
+ % them vertically:
+ tier/.pgfmath=level(),
+ %
+ where level=1{font={\bfseries}}{},%
+ },%
+ % Decrease distance to only affect root-first level with s sep, see
+ % https://tex.stackexchange.com/a/188461/120853
+ [Overall Category, anchor=south, rotate=90, for children={s sep-=1em}
+ [Number One
+ [At vero eos]
+ [et accusamus]
+ [et iusto]
+ ]
+ [Number Two
+ [{odio dignissimos, ducimus}]% Escape commas
+ [qui blanditiis]
+ [praesentium]
+ [voluptatum]
+ [deleniti atque]
+ [corrupti quos]
+ [dolores et]
+ [quas molestias]
+ ]
+ [Number Three
+ [excepturi sint]
+ [occaecati]
+ [non provident]
+ [similique]
+ [sunt in culpa qui officia]
+ ]
+ [Number Four
+ [deserunt]
+ [mollitia
+ [{animi, id est}]
+ [laborum et]
+ ]
+ ]
+ [Number Four
+ [dolorum
+ [fuga]
+ [Et harum]
+ ]
+ [quidem
+ [rerum facilis]
+ [est et expedita]
+ ]
+ ]
+ [distinctio
+ [Nam libero]
+ [tempore]
+ [soluta nobis]
+ [est eligendi]
+ ]
+ ]
+ \end{forest}
+ }
+\end{figure}
+
 \subsection{Plotting}
 
 If you rely on tools like \texttt{matlab2tikz}, this is for you.