gvcolor(1) 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
already have been processed by dot. Appropriate choice of initial col-
ors 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 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
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.
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)
graphviz 2.49.1 - Generated Mon Oct 18 18:32:05 CDT 2021