%%
%% Ein Beispiel der DANTE-Edition
%%
%% 2. Auflage
%%
%% Beispiel 15-02-14 auf Seite 721.
%%
%% Copyright (C) 2016 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 := 1.25cm;
for i=0 step 0.5 until 360:
pair P;
farbe := i/360;
P = 1u*(sind(3*i), cosd(2*i));
fill fullcircle scaled 2mm shifted P
withcolor white;
draw fullcircle scaled 2mm shifted P
withcolor
if farbe>0.5: (2*(1-farbe)) [red, blue]
else: (1-2farbe) [blue, red]
fi;
endfor;
endfig;
end;
