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Diffstat (limited to 'Master/texmf-dist/doc/latex/einfuehrung/15-02-29.mp')
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diff --git a/Master/texmf-dist/doc/latex/einfuehrung/15-02-29.mp b/Master/texmf-dist/doc/latex/einfuehrung/15-02-29.mp new file mode 100644 index 00000000000..b1002317663 --- /dev/null +++ b/Master/texmf-dist/doc/latex/einfuehrung/15-02-29.mp @@ -0,0 +1,40 @@ +%% +%% Ein Beispiel der DANTE-Edition +%% +%% Beispiel 15-02-29 auf Seite 749. +%% +%% Copyright (C) 2012 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; |