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-\newcommand{\HypoCyclo}[4][100]{%
- \def\R{#2}\def\petitR{#3}\def\NbPt{#4}% définitions locales pour lisibilité
- %% Selon la valeur de R sur petitR :
- %% 4 une astroïde -- 3 une deltoïde -- 2 un diamètre (!)
- \def\Anglen{\n\space 360 \NbPt\space 1 add div mul}
- \pstGeonode{O}\pstCircleOA[Radius=\pstDistVal{\R}]{O}{}
- \pstGeonode[PointName=none](\R;0){P}
- \pstHomO[HomCoef=\petitR\space\R\space div, PointSymbol=none]{P}{O}{M}
- \multido{\n=1+1}{\NbPt}{%
- \pstRotation[RotAngle=\Anglen, PointSymbol=none]{O}{M}{M\n}
- \rput(M\n){\pstGeonode[PointSymbol=none](\petitR;0){Q}}
- \pstRotation[RotAngle=\Anglen, PointSymbol=none]{M\n}{Q}{N}
- \pstRotation[RotAngle=\n\space -360 \NbPt\space 1 add div
- mul \R\space\petitR\space div mul, PointName=none]%
- {M\n}{N}{N\n}
- \ifnum\n=#1
- \pstCircleOA{M\n}{N\n}\ncline{M\n}{N\n}%
- \psset{linecolor=red, linewidth=2\pslinewidth}
- \pstArcOAB{M\n}{N\n}{N}\pstArcOAB{O}{P}{N}
- \fi}}%fin multido-newcommand