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authorKarl Berry <karl@freefriends.org>2013-02-13 00:06:34 +0000
committerKarl Berry <karl@freefriends.org>2013-02-13 00:06:34 +0000
commit33b9decf3736250e2c7bc7c110b29116cef82dda (patch)
treebb7f7257a9b96e51599ca309607995d89ecd82fe /Master/texmf-dist/doc/luatex/luaintro/07-02-2.lualtx
parentfee6ae63b6689ddbae970ff9114c6ed976bf1dab (diff)
luaintro (12feb13)
git-svn-id: svn://tug.org/texlive/trunk@29093 c570f23f-e606-0410-a88d-b1316a301751
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+%%
+%% Ein Beispiel der DANTE-Edition
+%%
+%% 1. Auflage
+%%
+%% Beispiel 07-02-2 auf Seite 149.
+%%
+%% Copyright (C) 2013 Herbert Voss
+%%
+%% It may be distributed and/or modified under the conditions
+%% of the LaTeX Project Public License, either version 1.3
+%% of this license or (at your option) any later version.
+%%
+%% See http://www.latex-project.org/lppl.txt for details.
+%%
+%%
+%% ====
+% Show page(s) 1
+%%
+%%
+\documentclass[]{exaarticle}
+\pagestyle{empty}
+\setlength\textwidth{352.81416pt}
+%StartShownPreambleCommands
+\usepackage{luamplib} \newsavebox\MPBox
+%StopShownPreambleCommands
+\begin{document}
+\begin{lrbox}{\MPBox}
+\begin{mplibcode}
+vardef randomwalk(expr C,wd,ht,n,l,f,r)=save A,B,a,b;
+ pair A,B;a=0;
+ draw ((wd,-ht)--(wd,ht)--(-wd,ht)--(-wd,-ht)--cycle) shifted C;
+ A=C;
+ for i=1 upto n:
+ forever:
+ b:=a*f+((uniformdeviate 2)-1)*180r;
+ B:=A+l*(uniformdeviate 1)*dir(b);
+ if (abs(xpart(B-C))>= wd) or (abs(ypart(B-C))>= ht):
+ B:=A+l*(uniformdeviate 2)*dir(b+180);
+ fi;
+ exitif (abs(xpart(B-C))< wd) and (abs(ypart(B-C))< ht);
+ endfor;
+ draw A--B;A:=B;a:=b mod 360;
+ endfor;
+enddef;
+beginfig(1)
+randomwalk(origin, 2cm,2cm,1000,10mm,0,1);
+randomwalk((5cm,0),2cm,2cm,3000, 4mm,1,0.3);
+endfig;
+\end{mplibcode}
+\end{lrbox}
+Text \fbox{\usebox\MPBox} Text
+\end{document}