Cette version utilise la macro :
\parametricplotHSB pour dessiner des courbes aux couleurs de l'arc-en-ciel :
http://pstricks.blogspot.fr/2011/09/vos-courbes-aux-couleurs-de-larc-en.html
Ci-dessous le listing permettant d'obtenir les images pour créer le Gif animé ci-dessus :
\documentclass{article}
\usepackage[paperwidth=8cm,paperheight=8cm,hmargin={0cm,0cm},vmargin={0cm,0cm},dvips]{geometry}
\usepackage{pst-plot}
\psset{dimen=middle}
\pagestyle{empty}
\author{Manuel Luque}
\date{10 mars 2016}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Essai de Manuel Luque 19 février 2003
% transformé par Denis Girou le 25 février 2003
% révision le 14 septembre 2011
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\makeatletter
\pst@addfams{pst-plothsb}
\define@key[psset]{pst-plothsb}{HueBegin}{% Between 0 and 1
\edef\PstParametricplotHSB@HueBegin{#1}}
\define@key[psset]{pst-plothsb}{HueEnd}{% Between 0 and 1
\edef\PstParametricplotHSB@HueEnd{#1}}
\newif\ifPst@HSB
\define@key[psset]{pst-plothsb}{HSB}[true]{\@nameuse{Pst@HSB#1}}
% Default values
\psset{HueBegin=0,HueEnd=1,HSB=true}
\def\parametricplotHSB{\pst@object{parametricplotHSB}}
\def\parametricplotHSB@i{\@ifnextchar[{\parametricplotHSB@do}{\parametricplotHSB@do[]}}
\def\parametricplotHSB@do[#1]#2#3#4{{%
\psset{#1}%
\begin@ClosedObj
\addto@pscode{%
/t #2 def
/dt #3 t sub \psk@plotpoints\space div def
/t t dt sub def
/Counter 0 def
\psk@plotpoints {
/t t dt add def
/Counter Counter 1 add def
/F@pstplot \ifPst@algebraic (#4)
tx@AlgToPs begin AlgToPs end cvx
\else { #4 }
\fi
def
\ifPst@algebraic
F@pstplot
\else #4
\fi
\pst@number\psyunit mul exch
\pst@number\psxunit mul exch
1 Counter eq
{moveto} % First point
{\ifPst@HSB % Other points than the first one
/PointY exch def
/PointX exch def
Counter \psk@plotpoints\space div
\PstParametricplotHSB@HueEnd\space
\PstParametricplotHSB@HueBegin\space sub mul
\PstParametricplotHSB@HueBegin\space add
1 1 sethsbcolor
PointX PointY lineto
stroke
PointX PointY moveto
\else
lineto
\fi} ifelse
} repeat}% fin du code ps
\end@ClosedObj}} % fin de la commande PSTricks
\makeatother
\begin{document}
\begin{center}
\multido{\r=-1.8+0.1}{35}{%
\begin{pspicture}(-4,-4)(4,4)
\pstVerb{/R1 3 def /R2 1 def /p1 17 def /q1 5 def /2pi 6.283185 def /ax \r\space def /by 0 def
}%
%\pscircle{!R1}
\psframe*(-4,-4)(4,4)
\parametricplot[plotpoints=1040,linecolor=yellow!10,linewidth=0.25,algebraic]{0}{2pi q1 mul 0.1 add}{(R1*cos(t)+(R2*cos(t)+ax))/2+(R1*cos(t)-(R2*cos(t)+ax))/2*cos(p1*t/q1)| % x
(R1*sin(t)+(R2*sin(t)+by))/2+(R1*sin(t)-(R2*sin(t)+by))/2*cos(p1*t/q1) % y
}
\parametricplotHSB[plotpoints=3600,algebraic,linewidth=2\pslinewidth,plotstyle=curve]{0}{2pi q1 mul 0.1 add}{(R1*cos(t)+(R2*cos(t)+ax))/2+(R1*cos(t)-(R2*cos(t)+ax))/2*cos(p1*t/q1)| % x
(R1*sin(t)+(R2*sin(t)+by))/2+(R1*sin(t)-(R2*sin(t)+by))/2*cos(p1*t/q1) % y
}
%\pscircle(\r,0){!R2}
\end{pspicture}\newpage}
\multido{\r=1.8+-0.1}{35}{%
\begin{pspicture}(-4,-4)(4,4)
\pstVerb{/R1 3 def /R2 1 def /p1 17 def /q1 5 def /2pi 6.283185 def /ax \r\space def /by 0 def
}%
%\pscircle{!R1}
\psframe*(-4,-4)(4,4)
\parametricplot[plotpoints=1040,linecolor=yellow!10,linewidth=0.25,algebraic]{0}{2pi q1 mul 0.1 add}{(R1*cos(t)+(R2*cos(t)+ax))/2+(R1*cos(t)-(R2*cos(t)+ax))/2*cos(p1*t/q1)| % x
(R1*sin(t)+(R2*sin(t)+by))/2+(R1*sin(t)-(R2*sin(t)+by))/2*cos(p1*t/q1) % y
}
\parametricplotHSB[plotpoints=3600,algebraic,linewidth=2\pslinewidth]{0}{2pi q1 mul 0.1 add}{(R1*cos(t)+(R2*cos(t)+ax))/2+(R1*cos(t)-(R2*cos(t)+ax))/2*cos(p1*t/q1)| % x
(R1*sin(t)+(R2*sin(t)+by))/2+(R1*sin(t)-(R2*sin(t)+by))/2*cos(p1*t/q1) % y
}
%\pscircle(\r,0){!R2}
\end{pspicture}\newpage}
\end{center}
\end{document}