Basics of tikz (lines, plots, grids)

latex-tikz-example.tex

\section{Example drawings with tikz}
% cremeronline.com/LaTeX/minimaltikz.pdf                                                                                                                                                                                          
% You have to \usepackage{tikz}                                                                                                                                                                                                   
\begin{figure}[h]
  \begin{center}
    \begin{tikzpicture}
      \draw[help lines] (0,0) grid (2,4);
      \draw (0,1) --(1,3.666) --(2,1) -- (2,0) --(0,0) -- (0,1);
      \draw [->] (3.5,0.5) -- (6,0.5);
      \draw [|->] (3.5,1) -- (6,1);
      \draw [|->] [ultra thin] (3.5,1.5) -- (6,1.5);
      \draw [|->] [very thin] (3.5,2) -- (6,2);
      \draw [|->] [thin] (3.5,2.5) -- (6,2.5);
      \draw [|->] [semithick] [green] (3.5,3) -- (6,3);
      \draw [|->] [thick] [dashed] (3.5,3.5) -- (6,3.5);
      \draw [|->] [very thick] (3.5,4) -- (6,4);
      \draw [|->] [ultra thick] (3.5,4.5) -- (6,4.5);
      \draw [<->] (0,5) -- (0,5.5) -- (0.5,5) -- (0.5,5.5);
    \end{tikzpicture}
    \caption{Lines and grids}
  \end{center}
\end{figure}

\begin{figure}[!h]
  \begin{center}
    \begin{tikzpicture}
      \draw [->] (0,0) -- (0,1);
      \draw [->] (0,0) -- (2*pi,0);
      \draw [red,domain=0:2*pi] plot (\x,{sin(\x r});
      \draw [olive,domain=0:2*pi] plot (\x,{0.5*sin(\x r});
      \draw [domain=0:2*pi] plot (\x,{0.25*sin(\x r});
    \end{tikzpicture}
    \caption{Plot}
  \end{center}
\end{figure}