Chain example

\documentclass[margin=10pt,convert]{standalone}
\usepackage{asymptote}
\begin{document}
\begin{asydef}
// Global Asymptote definitions 
real linkLen=1, linkWidth=2pt; 
real rl=2+linkLen;              // distance between beads
guide link=(1,0)--(1+linkLen,0);   // a link
pen beadColor=orange;
pen linkColor=beadColor;
void bead(transform t){  
  draw(t*link,linkColor+linkWidth);
  radialshade(t*unitcircle,
    beadColor,shift(t)*(-0.4,0.3),0.01
   ,black,shift(t)*(-0.4,0.3),1.5); 
}
pair operator>(pair pos=(0,0), real phi){
  transform t=shift(pos)*rotate(phi);
  bead(t); // draw a bead with a link
  pos+=rl*(Cos(phi),Sin(phi)); // Sin, Cos - in degrees, sin, cos - in radians
  return pos;
}; 
pair pos;
\end{asydef}
\begin{asy}
  size(150,150);
  beadColor=lightyellow;
  linkColor=lightblue;
  pos=pos>90>90>42>0>0>0>0>-130>0>0>-130;   
  label( "Some text here",pos);
\end{asy}
\end{document}

Source: TeX.SE

Author: g.kov (License)