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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}