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-%%
-%% Ein Beispiel der DANTE-Edition
-%%
-%% 1. Auflage
-%%
-%% Beispiel 15-02-28 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)
-def compute_curve(suffix f)(expr xmin,xmax,xinc) =
- ( (xmin,f(xmin))
- for x=xmin+xinc step xinc until xmax: ..(x,f(x))
- endfor )
-enddef; vardef f(expr x)=x**2+1 enddef;
-vardef g(expr x)=2.6-(x-1)**2 enddef; path p, q;
-p:=compute_curve(f,-1,1.5,0.1) scaled 1cm;
-q:=compute_curve(g,-0.5,2,0.1) scaled 1cm;
-fill buildcycle(p,reverse q) withcolor red;
-draw p withpen pencircle scaled 1bp;
-draw q withpen pencircle scaled 1bp;
-drawarrow (-1cm,0)--(2cm,0);label.rt("x",(2cm,0));
-drawarrow (0,0)--(0,3cm);label.top("y",(0,3cm));
-endfig;
-end;