\embed{definition}{&nbsp;}<pre class  =  "cc">
\text\lbrac dessin =  
   <tt class="des">xrange</tt> -7.2,7.2
   <tt class="des">yrange</tt> -7.2,7.2
   <tt class="des">parallel</tt> -7,-7,7,-7,0,1,16, grey
   <tt class="des">parallel</tt> -7,-7,-7,7,1,0,16, grey
   <tt class="des">hline</tt> 0,0,black
   <tt class="des">arrow</tt> 0,0,1,0,8, black
   <tt class="des">arrow</tt> 0,0,0,1,8, black
   <tt class="des">vline</tt> 0,0,black \rbrac
\statement\lbrac 
  <tt class="comm">\\draw</tt>\lbrac 200,200 \rbrac\lbrac 
     \\dessin 
  \rbrac
\rbrac </pre>
<div class  = "aide"> Pour faire facilement du papier quadrillé </div>
<center>\def{text dessin =  
  xrange -7.2,7.2
  yrange -7.2,7.2
  parallel -7,-7,7,-7,0,1,16, grey
  parallel -7,-7,-7,7,1,0,16, grey
  hline 0,0,black
  arrow 0,0,1,0,8, black
  arrow 0,0,0,1,8, black
  vline 0,0,black
}
  \draw{200,200}{\dessin}
</center><pre class  =  "cc">
\text\lbrac dessin  =  
   <tt class="des">xrange</tt> -7,7
   <tt class="des">yrange</tt> -7,7
   <tt class="des">parallel</tt> -7,-7,7,-7,0,0.1,160, grey
   <tt class="des">parallel</tt> -7,-7,-7,7,0.1,0,160, grey
   <tt class="des">parallel</tt> -7,-7,7,-7,0,1,16, blue
   <tt class="des">parallel</tt> -7,-7,-7,7,1,0,16, blue
   <tt class="des">hline</tt> 0,0,black
   <tt class="des">arrow</tt> 0,0,1,0,8, black
   <tt class="des">arrow</tt> 0,0,0,1,8, black
   <tt class="des">vline</tt> 0,0,black \rbrac
\statement\lbrac 
    <tt class=comm>\\draw</tt>\lbrac 400,400 \rbrac\lbrac \\dessin \rbrac 
\rbrac </pre>
<div class  = "aide"> Encore plus raffiné, mais ne pas abuser !</div>

\def{text dessin =
  xrange -7,7
  yrange -7,7
  parallel -7,-7,7,-7,0,0.1,160, grey
  parallel -7,-7,-7,7,0.1,0,160, grey
  parallel -7,-7,7,-7,0,1,16, blue
  parallel -7,-7,-7,7,1,0,16, blue
  hline 0,0,black
  arrow 0,0,1,0,8, black
  arrow 0,0,0,1,8, black
  vline 0,0,black
}
<center>\draw{400,400}{\dessin}</center>