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PL2MC

       SUBROUTINE  PL2MC (X,Y,VISBLE)
 C$    (2-D Cartesian Pen Movement with Margin Compressed)
 C$    Move the pen  to the  point (X,Y)  on a  unit square,  with
 C$    visibility determined  by the  LOGICAL value  VISBLE.   The
 C$    unit square  is scaled  onto a  square inside  an 0.1  unit
 C$    margin of  the  plot  unit square,  and  coordinates  (X,Y)
 C$    outside the unit square are compressed into the margin by a
 C$    hyperbolic tangent distortion.  In this way, the entire X-Y
 C$    plane outside  the  unit  square  is  compressed  into  the
 C$    margin.  This compression is often a useful alternative  to
 C$    clipping, in that all drawing movements become visible.
 C$    (09-APR-82)