gvcolor - flow colors through a ranked digraph
   ( previously known as colorize )


   gvcolor [ files ]


   dot file.gv | gvcolor | dot -T<format>


   gvcolor  is  a  filter  that sets node colors from initial seed values.
   Colors flow along edges from tail to head, and  are  averaged  (as  HSB
   vectors)  at nodes.  The graph must already have been processed by dot.
   Appropriate choice of initial colors  yields  drawings  in  which  node
   colors help to emphasize logical relationships between nodes, even when
   they are spread far apart in the layout.

   Initial colors must be set externally, using the color attribute  of  a
   node.   It  is  often effective to assign colors to a few key source or
   sink nodes, manually setting their colors by editing  the  graph  file.
   Color  names  are  as  in dot(1): symbolic names or RGB triples.  It is
   best to  choose  some  easilydistinguished  but  related  colors;  not
   necessarily  spaced  evenly  around  the  color  wheel.   For  example,
   blue_green, green, and light_yellow looks better than red, green, blue.

   Certain graph attributes  control  the  gvcolor  algorithm.   flow=back
   reverses  the flow of colors from heads to tails.  saturation=.1,.9 (or
   any two numbers between 0 and 1) adjusts the color saturation  linearly
   from  least  to greatest rank.  If Defcolor is set, this color value is
   applied to any node not otherwise colored.


   The following exit values are returned:

   0   Successful completion.

   1   If nodes of the graph do not possess a ``pos'' attribute.


   It would be nice to make the program work without relying on an initial
   pass through dot.


   Stephen C. North <north@research.att.com>
   Emden R. Gansner <erg@research.att.com>


   gc(1), dot(1), gvpr(1), ccomps(1), sccmap(1), tred(1), libgraph(3)

                             21 March 2001                      GVCOLOR(1)


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