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% troncoconedef.mp
% L. Nobre G.
% 2002
input featpost3Dplus2D;
verbatimtex
\documentclass{article}
\usepackage{beton}
\usepackage{concmath}
\usepackage{ccfonts}
\begin{document}
etex
f := (5,0,3);
def twoclicpathesinapen( expr CycleA, CycleB )=
begingroup
numeric TheLengthOfA, TheLengthOfB, TheMargin;
path SubPathA, SubPathB;
TheMargin = 0.02;
TheLengthOfA = ( length CycleA ) - TheMargin;
TheLengthOfB = ( length CycleB ) - TheMargin;
SubPathA = subpath ( 0, TheLengthOfA ) of CycleA;
SubPathB = subpath ( 0, TheLengthOfB ) of CycleB;
( makepath makepen ( SubPathA--SubPathB--cycle ) )
endgroup
enddef;
beginfig(0);
numeric rayo, rayt;
path onec, twoc, botc;
color axec, baso, bast;
rayo = 1;
rayt = 0.7;
axec = red;
baso = black;
bast = (1,1,1);
onec = goodcirclepath( baso, axec, rayo );
twoc = goodcirclepath( bast, axec, rayt );
botc = twoclicpathesinapen( onec, twoc );
fill botc withcolor green;
draw onec;
draw twoc;
draw botc;
dotlabel.bot( btex onec0 etex, point 0 of onec );
dotlabel.bot( btex twoc0 etex, point 0 of twoc );
endfig;
verbatimtex
\end{document}
etex
end.
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