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-%%
-%% Ein Beispiel der DANTE-Edition
-%%
-%% 1. Auflage
-%%
-%% Beispiel 15-02-29 auf Seite 749.
-%%
-%% Copyright (C) 2011 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
-%%
-defaultfont:="ptmr8r";
-warningcheck:=0;
-% --- start of displayed preamble in the book ---
-
-% --- end of displayed preamble in the book ---
-% %
-beginfig(1)
-u=8mm;
-vardef project(expr x,y,z)=x*(-1,-1)+y*(1,0)+z*(0,1) enddef;
-vardef f(expr x,y)=sind((x/u)**2 *180 +(y/u)**2 *180)*u/2 enddef;
-numeric m,M,inc,farbe;
-m:=-2u; M:=2u; inc:=.1u;
-for i=m step inc until M:
- for j=m step inc until M:
- path p;
- p=project(i,j,f(i,j))--project(i,j+inc,f(i,j+inc))--
- project(i+inc,j+inc,f(i+inc,j+inc))--project(i+inc,j,f(i+inc,j))--cycle;
- dfdx := (f(i,j) - f(i+inc,j))/inc; dfdy := (f(i,j) - f(i,j+inc))/inc;
- farbe := 1/sqrt( dfdx**2 + dfdy**2 + 1); fill p withcolor farbe*(red+green);
- endfor;
-endfor;
-endfig;
-end;