Set arrow coordinates when creating a new edge.
     1 %!PS-Adobe-2.0 EPSF-2.0
 
     2 %%Creator: LEMON, graphToEps()
 
     3 %%CreationDate: Tue Nov 15 16:51:43 2005
 
     4 %%BoundingBox: 0 0 596 842
 
     5 %%DocumentPaperSizes: a4
 
     7 /lb { setlinewidth setrgbcolor newpath moveto
 
     8       4 2 roll 1 index 1 index curveto stroke } bind def
 
     9 /l { setlinewidth setrgbcolor newpath moveto lineto stroke } bind def
 
    10 /c { newpath dup 3 index add 2 index moveto 0 360 arc closepath } bind def
 
    11 /sq { newpath 2 index 1 index add 2 index 2 index add moveto
 
    12       2 index 1 index sub 2 index 2 index add lineto
 
    13       2 index 1 index sub 2 index 2 index sub lineto
 
    14       2 index 1 index add 2 index 2 index sub lineto
 
    15       closepath pop pop pop} bind def
 
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    17       2 index             2 index 2 index add lineto
 
    18       2 index 1 index sub 2 index             lineto
 
    19       2 index             2 index 2 index sub lineto
 
    20       closepath pop pop pop} bind def
 
    21 /nc { 0 0 0 setrgbcolor 5 index 5 index 5 index c fill
 
    22      setrgbcolor 1.1 div c fill
 
    24 /nsq { 0 0 0 setrgbcolor 5 index 5 index 5 index sq fill
 
    25      setrgbcolor 1.1 div sq fill
 
    27 /ndi { 0 0 0 setrgbcolor 5 index 5 index 5 index di fill
 
    28      setrgbcolor 1.1 div di fill
 
    32 /lrl { 2 index mul exch 2 index mul exch rlineto pop} bind def
 
    33 /arr { setrgbcolor /y1 exch def /x1 exch def /dy exch def /dx exch def
 
    34        /w exch def /len exch def
 
    35        newpath x1 dy w 2 div mul add y1 dx w 2 div mul sub moveto
 
    36        len w sub arrl sub dx dy lrl
 
    38        dx arrl w add mul dy w 2 div arrw add mul sub
 
    39        dy arrl w add mul dx w 2 div arrw add mul add rlineto
 
    40        dx arrl w add mul neg dy w 2 div arrw add mul sub
 
    41        dy arrl w add mul neg dx w 2 div arrw add mul add rlineto
 
    43        len w sub arrl sub neg dx dy lrl
 
    44        closepath fill } bind def
 
    45 /cshow { 2 index 2 index moveto dup stringwidth pop
 
    46          neg 2 div fosi .35 mul neg rmoveto show pop pop} def
 
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