harvey/sys/src/cmd/gs/lib/markpath.ps

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% $Id: markpath.ps,v 1.2 2000/09/19 18:29:11 lpd Exp $
% markpath.ps
% Mark the corners of a path, drawing it slowly if desired.

/Delay where { pop } { /Delay 0 def } ifelse
/setxy0
 { currentpoint /y0 exch def /x0 exch def
 } def
/bip
 { epsx epsy idtransform /ey exch def /ex exch def
   currentpoint ex 2 div ey 2 div rlineto currentpoint 0 ey neg rlineto
   ex neg 0 rlineto 0 ey rlineto lineto lineto
   stroke
 } def
/dally
 { Delay { } repeat
   Delay 0 ne { flushpage } if
 } def
/movebip
 { /xs 2 index def /ys 1 index def
   gsave newpath mpmx transform moveto setxy0 bip grestore
 } def
/linebip
 { gsave newpath x0 y0 moveto mpmx transform lineto setxy0 bip dally grestore
 } def
/curvebip
 { gsave newpath x0 y0 moveto 5 index 5 index mpmx transform lineto bip
   2 copy mpmx transform moveto 3 index 3 index mpmx transform lineto bip
   x0 y0 moveto
   3 { mpmx transform 6 2 roll } repeat
   curveto setxy0 bip dally grestore
 } def
/closebip
 { xs ys linebip
 } def

/markpath		% <matrix> markpath -
 { /mpmx exch def 
   gsave initgraphics 9 dup dtransform grestore
     /epsy exch def   /epsx exch def
   gsave 0 setlinewidth
    { movebip } { linebip } { curvebip } { closebip } pathforall
   grestore
 } def