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GVCOLOR(1)		    General Commands Manual		    GVCOLOR(1)

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

SYNOPSIS
       gvcolor [ files ]

USAGE
       dot file.gv | gvcolor | dot -T_format_

DESCRIPTION
       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 col-
       ors  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 easily-distinguished	but related colors; not	neces-
       sarily  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  re-
       verses  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.

EXIT STATUS
       The following exit values are returned:

       0   Successful completion.

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

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

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

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

				 21 March 2001			    GVCOLOR(1)

NAME | SYNOPSIS | USAGE | DESCRIPTION | EXIT STATUS | BUGS | AUTHORS | SEE ALSO

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