TikZ and pgf

\begin{tikzpicture}[scale=3]
\draw[step=.5cm,gray,very thin] (-1.4,-1.4) grid (1.4,1.4);
\draw (-1.5,0) -- (1.5,0);
\draw (0,-1.5) -- (0,1.5);
\draw (0,0) circle (1cm);
\draw (3mm,0mm) arc (0:30:3mm);
\end{tikzpicture}
As for circles, you can specify “two” radii in order to get an elliptical arc.
\tikz \draw (0,0) arc (0:315:1.75cm and 1cm);
3.11 Clipping a Path
In order to save space in this manual, it would be nice to clip Karl’s graphics a bit so that we can focus on
the “interesting” parts. Clipping is pretty easy in TikZ. You can use the \clip command clip all subsequent
drawing. It works like \draw, only it does not draw anything, but uses the given path to clip everything
subsequently.
\begin{tikzpicture}[scale=3]
\clip (-0.1,-0.2) rectangle (1.1,0.75);
\draw[step=.5cm,gray,very thin] (-1.4,-1.4) grid (1.4,1.4);
\draw (-1.5,0) -- (1.5,0);
\draw (0,-1.5) -- (0,1.5);
\draw (0,0) circle (1cm);
\draw (3mm,0mm) arc (0:30:3mm);
\end{tikzpicture}
You can also do both at the same time: Draw and clip a path. For this, use the \draw command and
add the clip option. (This is not the whole picture: You can also use the \clip command and add the
draw option. Well, that is also not the whole picture: In reality, \draw is just a shorthand for \path[draw]
and \clip is a shorthand for \path[clip] and you could also say \path[draw,clip].) Here is an example:
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