gvcolor - flow colors through a ranked digraph
gvcolor [
files ]
dot file.gv | gvcolor | dot -T
<format>
gvcolor (previously known as
colorize) 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 easily‐distinguished 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 <
[email protected]>
Emden R. Gansner <
[email protected]>
gc(1),
dot(1),
gvpr(1),
ccomps(1),
sccmap(1),
tred(1),
libgraph(3)