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author | Taco Hoekwater <taco@elvenkind.com> | 2009-05-27 14:02:03 +0000 |
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committer | Taco Hoekwater <taco@elvenkind.com> | 2009-05-27 14:02:03 +0000 |
commit | 4634529c1714116c9bdb794a60ce12a9f20ae463 (patch) | |
tree | 6b29683be6c6c2a35d06589bb06825df2be66ba1 /Master/texmf-dist/doc/metapost/base/source-tutorial/draw.tex | |
parent | 30d91185abefb047f73a3cf6f7c69b13fa2391f6 (diff) |
second part of the new metapost documentation:
* rename source to source-manual
* add source-tutorial
* update the pdfs and index.html
* remove superfluous Makefile
git-svn-id: svn://tug.org/texlive/trunk@13496 c570f23f-e606-0410-a88d-b1316a301751
Diffstat (limited to 'Master/texmf-dist/doc/metapost/base/source-tutorial/draw.tex')
-rw-r--r-- | Master/texmf-dist/doc/metapost/base/source-tutorial/draw.tex | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/Master/texmf-dist/doc/metapost/base/source-tutorial/draw.tex b/Master/texmf-dist/doc/metapost/base/source-tutorial/draw.tex new file mode 100644 index 00000000000..9ed9b3c1ed0 --- /dev/null +++ b/Master/texmf-dist/doc/metapost/base/source-tutorial/draw.tex @@ -0,0 +1,46 @@ +\subsection{The \texttt{draw} command} + +The most common command in \MP{} is the |draw| command. This command is +used to draw paths or pictures. In order to draw a path from +|z1:=(0,0)| to |z2:=(54,18)| to |z3:=(72,72)|, we should first decide +how we want the path to look. For example, if we want these points to +simply be connected by line segments, then we use + +\begin{lstlisting}[style=MP] +draw z1--z2--z3; +\end{lstlisting} + +However, if we want a smooth path between these points, we use + +\begin{lstlisting}[style=MP] +draw z1..z2..z3; +\end{lstlisting} + +In order to specify the direction of the path at the points, we use the +|dir| operator. In \autoref{fig:draw1} we see that the smooth path is +horizontal at |z1|, a 45\textdegree\ angle at |z2|, and vertical at +|z3|. These constraints on the B\'{e}zier curve are imposed by + +\begin{lstlisting}[style=MP] +draw z1{right}..z2{dir 45}..{up}z3; +\end{lstlisting} + +\begin{figure} + \begin{withattachment}{draw.mp} + \centering + \includegraphics{draw-1.mps} + \end{withattachment} + \caption{\texttt{draw} examples} + \label{fig:draw1} +\end{figure} + +Notice that |z2{dir 45}| forces the \textit{outgoing} direction at |z2| +to be 45\textdegree. This implies an \textit{incoming} direction at +|z2| of 45\textdegree. In order to require different incoming and +outgoing directions, we would use + +\begin{lstlisting}[style=MP] +draw z1{right}..{dir |$\theta_i$|}z2{dir |$\theta_o$|}..{up}z3; +\end{lstlisting} +where $\theta_i$ and $\theta_o$ are the incoming and outgoing +directions, respectively. |