% Author: Tom Bombadil
% Source: http://tex.stackexchange.com/a/74495/5645
% View edits made by Martin Thoma
\documentclass{scrartcl}
\usepackage[margin=10mm]{geometry}
\usepackage{tikz}
\usetikzlibrary{arrows,positioning} 
\usepackage{filecontents}
\usepackage{xifthen}

\usepackage{xcolor}
\definecolor{myLightGray}{HTML}{F9F9F9}
\definecolor{borderColor}{HTML}{CCCCCC}

\pgfdeclarelayer{background}
\pgfsetlayers{background,main}

\newcommand{\getsizes}%
{   \path (current bounding box.south west);
    \pgfgetlastxy{\xsw}{\ysw}
    \path (current bounding box.north east);
    \pgfgetlastxy{\xne}{\yne}
    \pgfmathsetlengthmacro{\picwidth}{\xne-\xsw}
    \pgfmathsetlengthmacro{\picheight}{\yne-\ysw}
    %\pgfmathsetmacro{\picscale}{\picwidth>\picheight ? (0.3*\textwidth)/\picwidth : (0.3*\textwidth)/\picheight}
    \pgfmathsetmacro{\picscale}{\picwidth>\picheight ? (1.05-\picturesperrow*0.05)/\picturesperrow*\textwidth/\picwidth : (1.05-\picturesperrow*0.05)/\picturesperrow*\textwidth/\picheight}
    \pgfmathsetlengthmacro{\biggervalue}{\picwidth>\picheight ? \picwidth : \picheight}
    \xdef\scalefactor{\picscale}
    \xdef\picdimension{\biggervalue}
}

\newcommand{\grayback}%
{   \begin{pgfonlayer}{background}
        \filldraw[color=myLightGray,draw=borderColor] (current bounding box.center) ++(-\picdimension/2,-\picdimension/2) rectangle ++(\picdimension,\picdimension);
    \end{pgfonlayer}
}

\newcommand{\adjustedtikzsize}[2]% draw commands, caption
{ \stepcounter{galleryitem}
    \smash{\vphantom{
    \begin{tikzpicture}
        #1
        \getsizes
    \end{tikzpicture}
    }}
    \begin{tikzpicture}[scale=\scalefactor,baseline=(captionnode.north)]
        #1
        \grayback
        \node[below right] (captionnode) at (current bounding box.south west) {#2};
    \end{tikzpicture}
    \pgfmathtruncatemacro{\breaktest}{mod(\thegalleryitem,\picturesperrow)}
    \ifthenelse{\breaktest=0}{\par}{\hfill}%{\hspace{0.02\textwidth}}
}

\newcounter{galleryitem}
\setcounter{galleryitem}{0}

\newenvironment{tikzgallery}[2]% gallery title, pics per row
{{\Huge\textbf{#1}}\par\xdef\picturesperrow{#2}}%
{\par\vspace{1cm}}

\begin{filecontents}{picone.tex}
    \tikzset{
        %Define standard arrow tip
        >=stealth',
        % Define arrow style
        pil/.style={->,thick}
    }

    \draw[fill=green!30] (0,0) -- (90:.75cm) arc (90:27:.75cm);
    \draw[pil,color=black] (0,0) -- node[right=2pt] {$\vec a$} (27:2.2cm);
    \draw[pil,color=black] (0,0) -- node[near end, right=-3pt] {$\vec b$} (90:2cm);
    \draw(60:0.5cm) node {$\varphi$};
\end{filecontents}

\begin{filecontents}{pictwo.tex}
    \tikzset{
        %Define standard arrow tip
        >=stealth',
        % Define arrow style
        pil/.style={->,thick}
    }
    \draw[fill=gray!30] (27:0.90) -- node[right=-0.28cm, near end] {$\cdot$} (27:1.08)
                        arc (27:117:.18cm);
    \draw[fill=green!30] (0,0) -- (90:.55cm) arc (90:27:.55cm);
    \draw[pil,color=red] (0,0) -- node[right=2pt] {$\vec a$} (27:3cm);
    \draw[pil,color=blue] (0,0) -- node[near end, right=-3pt] {$\vec b$} (90:2cm);

    \draw[pil,color=violet] (0,0) -- node[near start, right=7pt] {$\vec b_{\vec a}$} (27:0.90cm);
    \draw[color=gray, dashed] (27:0.90) -- node[near end, right] {} (90:2cm);

    \draw(60:0.35cm) node {$\varphi$};
\end{filecontents}

\begin{filecontents}{picthree.tex}
    \tikzset{
        %Define standard arrow tip
        >=stealth',
        % Define arrow style
        pil/.style={->,thick}
    }
    \draw[pil] (0,0)   -- node[near end, above] {$\vec a$} (3cm, 0cm);
    \draw[pil] (0,0.5cm) -- node[near end, above] {$\vec b$} (2cm,0.5cm);
\end{filecontents}

\begin{filecontents}{picfour.tex}
    \tikzset{
        %Define standard arrow tip
        >=stealth',
        % Define arrow style
        pil/.style={->,thick}
    }
    \draw[fill=gray!30, label=$a$] (0,0) -- node[above, near start] {$\cdot$} (0.5,0)
                        arc (0:90:0.5cm);
    \draw[pil] (0,0) -- node[near end, above] {$\vec e_1$} (2cm, 0);
    \draw[pil]  (0,0) -- node[near end, right] {$\vec e_2$} (0, 2cm);
\end{filecontents}

\begin{document}

\parindent0mm
\parskip0mm

\begin{tikzgallery}{Geometrie}{6}
    \adjustedtikzsize{\input{picone}}{one}
    \adjustedtikzsize{\input{pictwo}}{two}
    \adjustedtikzsize{\input{picthree}}{three}
    \adjustedtikzsize{\input{picfour}}{four}
    \adjustedtikzsize{\input{picfour}}{zero}    
    \adjustedtikzsize{\input{pictwo}}{un}
    \adjustedtikzsize{\input{picthree}}{deux}
    \adjustedtikzsize{\input{picone}}{trois}
    \adjustedtikzsize{\input{picone}}{one}
    \adjustedtikzsize{\input{pictwo}}{two}
    \adjustedtikzsize{\input{picthree}}{three}
    \adjustedtikzsize{\input{picfour}}{four}
    \adjustedtikzsize{\input{picfour}}{zero}    
    \adjustedtikzsize{\input{pictwo}}{un}
    \adjustedtikzsize{\input{picthree}}{deux}
    \adjustedtikzsize{\input{picone}}{trois}
    \adjustedtikzsize{\input{picone}}{one}
    \adjustedtikzsize{\input{pictwo}}{two}
    \adjustedtikzsize{\input{picthree}}{three}
    \adjustedtikzsize{\input{picfour}}{four}
    \adjustedtikzsize{\input{picfour}}{zero}    
    \adjustedtikzsize{\input{pictwo}}{un}
    \adjustedtikzsize{\input{picthree}}{deux}
    \adjustedtikzsize{\input{picone}}{trois}    
\end{tikzgallery}
\begin{tikzgallery}{Ti\textit{k}Z-Spielerei}{4}
    \adjustedtikzsize{\input{picone}}{one}
    \adjustedtikzsize{\input{pictwo}}{two}
    \adjustedtikzsize{\input{picthree}}{three}
    \adjustedtikzsize{\input{picfour}}{four}
    \adjustedtikzsize{\input{picfour}}{zero}    
    \adjustedtikzsize{\input{pictwo}}{un}
    \adjustedtikzsize{\input{picthree}}{deux}
    \adjustedtikzsize{\input{picone}}{trois}
    \adjustedtikzsize{\input{picone}}{one}
    \adjustedtikzsize{\input{pictwo}}{two}
    \adjustedtikzsize{\input{picthree}}{three}
    \adjustedtikzsize{\input{picfour}}{four}
    \adjustedtikzsize{\input{picfour}}{zero}    
    \adjustedtikzsize{\input{pictwo}}{un}
    \adjustedtikzsize{\input{picthree}}{deux}
    \adjustedtikzsize{\input{picone}}{trois}
    \adjustedtikzsize{\input{picone}}{one}
    \adjustedtikzsize{\input{pictwo}}{two}
    \adjustedtikzsize{\input{picthree}}{three}
    \adjustedtikzsize{\input{picfour}}{four}
    \adjustedtikzsize{\input{picfour}}{zero}    
    \adjustedtikzsize{\input{pictwo}}{un}
    \adjustedtikzsize{\input{picthree}}{deux}
    \adjustedtikzsize{\input{picone}}{trois}    
\end{tikzgallery}
\clearpage
\begin{tikzgallery}{Riesige Bilder}{2}
    \adjustedtikzsize{\input{picone}}{one}
    \adjustedtikzsize{\input{pictwo}}{two}
    \adjustedtikzsize{\input{picthree}}{three}
    \adjustedtikzsize{\input{picfour}}{four}
    \adjustedtikzsize{\input{picfour}}{zero}    
    \adjustedtikzsize{\input{pictwo}}{un}
    \adjustedtikzsize{\input{picthree}}{deux}
    \adjustedtikzsize{\input{picone}}{trois}
\end{tikzgallery}

\end{document}