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GVCOLOR(1)		    General Commands Manual		    GVCOLOR(1)

NAME
       gvcolor - flow colors through a ranked digraph

SYNOPSIS
       gvcolor [ files ]

USAGE
       dot file.gv | gvcolor | dot -T_format_

DESCRIPTION
       gvcolor	(previously known as colorize) is a filter that	sets node col-
       ors from	initial	seed values.  Colors flow along	 edges	from  tail  to
       head,  and  are averaged	(as HSB	vectors) at nodes.  The	graph must al-
       ready have been processed by dot.  Appropriate choice of	initial	colors
       yields  drawings	 in  which node	colors help to emphasize logical rela-
       tionships 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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