added letter example and vertex cover example

documents/letter/Makefile

@@ -0,0 +1,6 @@
+make:
+	pdflatex letter.tex -output-format=pdf
+	make clean
+
+clean:
+	rm -rf  *.aux *.log

documents/letter/letter.tex

@@ -0,0 +1,52 @@
+\documentclass[a4paper, 12pt, KOMAold]{scrlttr2}
+\usepackage[utf8]{inputenc} % this is needed for umlauts
+\usepackage[ngerman]{babel} % this is needed for umlauts
+\usepackage[T1]{fontenc}    % needed for right umlaut output in pdf
+\usepackage[ngerman, num]{isodate} % get DD.MM.YYYY dates
+ 
+% Anpassen %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\newcommand{\Vorname}{Martin}     % Vorname                         %
+\newcommand{\Nachname}{Thoma}     % Nachname                        %
+\newcommand{\Strasse}{Parkstraße} % Deine Straße                    %
+\newcommand{\Hausnummer}{17}      % Deine Hausnummer                %
+\newcommand{\PLZ}{76131}          % Deine PLZ                       %
+\newcommand{\Ort}{Karlsruhe}      % Dein Ort                        %
+\newcommand{\Kundennr}{123456}    % Deine Kundennummer              %
+                                                                    %
+\newcommand{\Empfaenger}{DB Fernverkehr AG} % Der Empfänger         %
+\newcommand{\EStrasse}{BahnCard-Service}    % Straße des Empfängers %
+\newcommand{\EPLZ}{60643}                   % PLZ des Empfängers    %
+\newcommand{\EOrt}{Frankfurt am Main}       % Ort des Empfängers    %
+                                                                    %
+\newcommand{\DocTitle}{Kündigung des Bahn-Abos} %Titel des Dokuments%
+% Datum der Kündigung                                               %
+\newcommand{\Kuendigungsdatum}{nächstmöglichen Termin}              %
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+ 
+ 
+% pdfinfo
+\pdfinfo{
+   /Author (\Nachname, \Vorname)
+   /Title  (\DocTitle)
+   /Subject (\DocTitle)
+   /Keywords (Kündigung)
+}
+ 
+% set letter variables
+\signature{\Vorname~\Nachname}
+\customer{\Kundennr}
+\backaddress{\Vorname~\Nachname, \Strasse~\Hausnummer, \PLZ~\Ort}
+ 
+% Begin document %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\begin{document}
+    \begin{letter}{\Empfaenger \\ \EStrasse \\ \EPLZ~\EOrt}
+    \date{\today}%Change this if you want a different date than today
+    \subject{Kündigung}
+    \opening{Sehr geehrte Damen und Herren,}
+    hiermit kündige ich meinen Vertrag für die Kundennummer 
+    \Kundennr~ zum \Kuendigungsdatum.\\
+ 
+    \noindent Ich bitte um eine Bestätigung der Kündigung.
+    \closing{Mit freundlichen Grüßen,}
+    \end{letter}
+\end{document}

tikz/3d-cmos-loss-diagram/Makefile

@@ -25,7 +25,11 @@ transparentGif:
 	make clean
 
 svg:
+	make
 	#inkscape $(SOURCE).pdf --export-plain-svg=$(SOURCE).svg
 	pdf2svg $(SOURCE).pdf $(SOURCE).svg
 	# Necessary, as pdf2svg does not always create valid svgs:
 	inkscape $(SOURCE).svg --export-plain-svg=$(SOURCE).svg
+	rsvg-convert -a -w $(WIDTH) -f svg $(SOURCE).svg -o $(SOURCE)2.svg
+	inkscape $(SOURCE)2.svg --export-plain-svg=$(SOURCE).svg
+	rm $(SOURCE)2.svg

tikz/vertex-cover-1/Makefile

@@ -0,0 +1,35 @@
+SOURCE = vertex-cover-1
+DELAY = 80
+DENSITY = 300
+WIDTH = 500
+
+make:
+	pdflatex $(SOURCE).tex -output-format=pdf
+	make clean
+
+clean:
+	rm -rf  $(TARGET) *.class *.html *.log *.aux *.data *.gnuplot
+
+gif:
+	pdfcrop $(SOURCE).pdf
+	convert -verbose -delay $(DELAY) -loop 0 -density $(DENSITY) $(SOURCE)-crop.pdf $(SOURCE).gif
+	make clean
+
+png:
+	make
+	make svg
+	inkscape $(SOURCE).svg -w $(WIDTH) --export-png=$(SOURCE).png
+
+transparentGif:
+	convert $(SOURCE).pdf -transparent white result.gif
+	make clean
+
+svg:
+	make
+	#inkscape $(SOURCE).pdf --export-plain-svg=$(SOURCE).svg
+	pdf2svg $(SOURCE).pdf $(SOURCE).svg
+	# Necessary, as pdf2svg does not always create valid svgs:
+	inkscape $(SOURCE).svg --export-plain-svg=$(SOURCE).svg
+	rsvg-convert -a -w $(WIDTH) -f svg $(SOURCE).svg -o $(SOURCE)2.svg
+	inkscape $(SOURCE)2.svg --export-plain-svg=$(SOURCE).svg
+	rm $(SOURCE)2.svg

tikz/vertex-cover-1/vertex-cover-1.tex

@@ -0,0 +1,50 @@
+\documentclass{article}
+\usepackage[pdftex,active,tightpage]{preview}
+\setlength\PreviewBorder{2mm}
+
+\usepackage{tikz}
+\usetikzlibrary{arrows}
+
+\begin{document}
+\begin{preview}
+\tikzset{mynode/.style={circle,minimum height=15pt,minimum width=15pt,draw,fill=blue!10},}
+\begin{tikzpicture}
+  \node[mynode] (n1) at (0,0) {$n_1$};
+  \node[mynode] (n2) at (2,0) {$n_2$};
+  \node[mynode] (n3) at (4,0) {$n_3$};
+  \node[mynode] (n4) at (6,0) {$n_4$};
+  \node[mynode] (n5) at (8,0) {$n_5$};
+  \node[mynode] (n6) at (0,2) {$n_6$};
+  \node[mynode] (n7) at (2,2) {$n_7$};
+  \node[mynode] (n8) at (4,2) {$n_8$};
+  \node[mynode] (n9) at (6,2) {$n_9$};
+  \node[mynode] (n10) at (8,2) {$n_{10}$};
+  \node[mynode] (n11) at (0,4) {$n_{11}$};
+  \node[mynode] (n12) at (2,4) {$n_{12}$};
+  \node[mynode] (n13) at (4,4) {$n_{13}$};
+  \node[mynode] (n14) at (6,4) {$n_{14}$};
+  \node[mynode] (n15) at (8,4) {$n_{15}$};
+  \node[mynode] (n16) at (0,6) {$n_{16}$};
+  \node[mynode] (n17) at (2,6) {$n_{17}$};
+  \node[mynode] (n18) at (4,6) {$n_{18}$};
+  \node[mynode] (n19) at (6,6) {$n_{19}$};
+  \node[mynode] (n20) at (8,6) {$n_{20}$};
+  \node[mynode] (n21) at (0,8) {$n_{21}$};
+  \node[mynode] (n22) at (2,8) {$n_{22}$};
+  \node[mynode] (n23) at (4,8) {$n_{23}$};
+  \node[mynode] (n24) at (6,8) {$n_{24}$};
+  \node[mynode] (n25) at (8,8) {$n_{25}$};
+  \node[mynode] (n26) at (10,8) {$n_{26}$};
+  \node[mynode] (n27) at (10,6) {$n_{27}$};
+  \node[mynode] (n28) at (10,4) {$n_{28}$};
+
+  \foreach \from/\to in {n1/n2,n1/n6,n2/n7,n3/n8,n3/n9,n4/n9,n5/n9,
+    n5/n10,n6/n7,n7/n13,n7/n8,n8/n14,n8/n9,n9/n10,n9/n15,
+    n11/n12,n12/n13,n12/n18,n13/n17,n13/n18,n13/n19,n13/n14,n14/n15,n14/n18,n14/n19,n15/n20,
+    n16/n17,n17/n22,n18/n19,n18/n24,n19/n24,n20/n24,
+    n21/n22,n23/n24,n24/n25,n27/n28}
+    \draw (\from) -- (\to);
+
+\end{tikzpicture}
+\end{preview}
+\end{document}