Added Git branching and history graph

A graph was added showing how Git branching and history are used to
verfiy the integrity of the result.

2 files changed, 90 insertions, 0 deletions

diff --git a/tex/git-branch.tex b/tex/git-branch.tex
new file mode 100644
index 0000000..98234d3
--- /dev/null
+++ b/tex/git-branch.tex
@@ -0,0 +1,90 @@
+\begin{columns}
+  \column{5cm}
+  \vspace{-0.4cm}
+
+  \begin{tikzpicture}
+
+    \draw [white] (0,0) -- (0,8.3);
+
+    %% Template branch.
+    \ifdefined\tofuture
+    \draw[->, line width=2mm] (0,0) -- (0,8.2);
+    \else
+    \draw[->, line width=2mm] (0,0) -- (0,6.5);
+    \fi
+
+    %% Project branch.
+    \ifdefined\projbranch
+      \draw[line width=2mm] (0,1.5) -- (1,2);
+      \ifdefined\tofuture
+        \draw[->, line width=2mm] (0.95,1.92) -- (0.95,8);
+      \else
+        \draw[->, line width=2mm] (0.95,1.92) -- (0.95,7);
+      \fi
+    \fi
+
+    %% Merge link
+    \ifdefined\mergebranch
+    \draw[line width=2mm] (0,5.5) -- (0.95,6.05);
+    \fi
+
+    %% Template commits.
+    \ifdefined\tofuture
+      \foreach \y in {0.55,...,7.55}
+      \draw [fill=green!80!blue, opacity=0.5] (0,\y) circle [radius=2.1mm];
+    \else
+      \foreach \y in {0.55,...,6.5}
+      \draw [fill=green!80!blue, opacity=0.5] (0,\y) circle [radius=2.1mm];
+    \fi
+
+    %% Project commits.
+    \ifdefined\projbranch
+      \draw[anchor=north] (1,1.7) node {Project};
+
+      \ifdefined\tofuture
+        \foreach \y in {2,...,7.55}
+        \draw [fill=red!60!green, opacity=0.5] (0.95,\y) circle [radius=2.1mm];
+      \else
+        \ifdefined\mergebranch
+          \foreach \y in {2,...,6.5}
+          \draw [fill=red!60!green, opacity=0.5] (0.95,\y) circle [radius=2.1mm];
+        \else
+          \foreach \y in {2,...,5}
+          \draw [fill=red!60!green, opacity=0.5] (0.95,\y) circle [radius=2.1mm];
+        \fi
+      \fi
+    \fi
+
+    \draw[anchor=north] (0,0) node {Template};
+
+    %% Happy scientist
+    \ifdefined\githappy
+    \node [inner sep=0pt] at (3.5,6) {\includegraphics[width=2cm]{img/happy.jpg}};
+    \node [inner sep=0pt] at (4.15,7.3) {\includegraphics[width=0.2cm]{img/checkmark.png}};
+    \draw[anchor=east] (2.4,7) node {\footnotesize\texttt{5cfe2eab}};
+    \draw[anchor=south] (4.5,7) node [rotate=20] {\tiny\texttt{5cfe2eab}};
+    \fi
+
+  \end{tikzpicture}
+
+  \column{6cm}
+  \begin{itemize}
+    \setlength\itemsep{0.6cm}
+  \item Template's history is recorded.
+    \ifdefined\projbranch
+  \item New projects: a branch in the history.
+    \fi
+    \ifdefined\mergebranch
+  \item Low-level updates in the template can always be imported into
+    a project.
+    \fi
+    \ifdefined\tofuture
+  \item The template and project will \alert{evolve}.
+    \fi
+    \ifdefined\githappy
+  \item Upon publication, the \alert{Git hash} is enough to verify the
+    integrity of the result.
+  \item During research this encourages creative tests on any step.
+    \fi
+  \end{itemize}
+\end{columns}
diff --git a/tex/plot.tex b/tex/project-graph.tex
index 566a9e7..566a9e7 100644
--- a/tex/plot.tex
+++ b/tex/project-graph.tex