\documentclass{article}
\usepackage[usenames]{color}
\usepackage{gastex}

\begin{document}

% polygons and closed curves

\begin{center}
\begin{picture}(120,40)(0,0)
%   \put(0,0){\framebox(120,40){}}
  \put(3,3){
    \unitlength=8mm
    \drawpolygon[fillcolor=Green,Nframe=n,arcradius=.3](0,0)(0,2)(1,3)(0,4)(2,4)(2,2)(4,0)(2,0)(1,1)
    \drawpolygon(0,0)(0,2)(1,3)(0,4)(2,4)(2,2)(4,0)(2,0)(1,1)
    \drawccurve[linecolor=Red](0,0)(0,2)(1,3)(0,4)(2,4)(2,2)(4,0)(2,0)(1,1)
  }
  \put(55,20){
    \unitlength=1.4mm
    \drawpolygon[fillcolor=Green,Nframe=n,arcradius=2](-10,-10)(10,10)(-10,10)(10,-10)
    \drawpolygon(-10,-10)(10,10)(-10,10)(10,-10)
    \drawccurve[linecolor=Red](-10,-10)(10,10)(-10,10)(10,-10)
  }
  \put(100,19){
    \unitlength=20mm
    \drawccurve[fillcolor=Yellow,linecolor=Red](0,1)(0.59,-0.8)(-0.95,0.3)(0.95,0.3)(-0.59,-0.8)
    \drawpolygon(0,1)(0.59,-0.8)(-0.95,0.3)(0.95,0.3)(-0.59,-0.8)
  }
\end{picture}
\end{center}

\end{document}