Axis - Canvas with Axes
  $mw = MainWindow->new;                                           
  $t = $mw->Axis(-xmax => 10, -ymax => 10);                        
  $t->create('line',$t->plx(2),$t->ply(3.1),$t->plx(4),$t->ply(4));
This is an improved version of the axis widget. Changes with respect to the
previous version are :
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* 
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the 'pack' has been moved out the widget. One has to do his own packing
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* 
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it is now possible to work in the coordinates of the axis. The following
piece of code draws a line between the points (2 , 3.1)  (4 , 4).
.
 Kris Boulez		(Kris.Boulez@rug.ac.be)
 Biomolecular NMR unit<http://bionmr1.rug.ac.be/~kris>
 University of Ghent, Belgium