Flow Chart
This example requires at least version 3.0 of the PGF/TiKZ bundle.
\documentclass{article}
\usepackage{tikz}[2013/12/13]% use at least version 3.0
\usetikzlibrary{arrows.meta}
\usetikzlibrary{shapes.geometric}
\usetikzlibrary{positioning}
\begin{document}
\begin{tikzpicture}[ultra thick,>={Triangle[]}]
\node[rounded corners,draw,fill=red!30] (start) {Ray-gun doesn't work};
\node[diamond,aspect=2,draw,fill=yellow,below=of start] (query) {Is it charged?};
\begin{scope}[every node/.style={draw,fill=green!40,rounded corners}]
\node[right=of query] (recharge) {Recharge battery};
\node[below=of query] (repair) {Repair ray-gun};
\end{scope}
% draw in arrows:
\draw[->] (start) -- (query);
\draw[->] (query) -- (recharge) node[midway,above] {No};
\draw[->] (query) -- (repair) node[midway,right] {Yes};
\end{tikzpicture}
\end{document}
Download flowchart-sample.tex or flowchart-sample.pdf.