1GVCOLOR(1) General Commands Manual GVCOLOR(1)
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6 gvcolor - flow colors through a ranked digraph
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9 gvcolor [ files ]
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12 dot file.gv | gvcolor | dot -T<format>
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15 gvcolor (previously known as colorize) is a filter that sets node col‐
16 ors from initial seed values. Colors flow along edges from tail to
17 head, and are averaged (as HSB vectors) at nodes. The graph must
18 already have been processed by dot. Appropriate choice of initial col‐
19 ors yields drawings in which node colors help to emphasize logical
20 relationships between nodes, even when they are spread far apart in the
21 layout.
22 Initial colors must be set externally, using the color attribute of a
24 node. It is often effective to assign colors to a few key source or
25 sink nodes, manually setting their colors by editing the graph file.
26 Color names are as in dot(1): symbolic names or RGB triples. It is
27 best to choose some easily‐distinguished but related colors; not neces‐
28 sarily spaced evenly around the color wheel. For example, blue_green,
29 green, and light_yellow looks better than red, green, blue.
30 Certain graph attributes control the gvcolor algorithm. flow=back
32 reverses the flow of colors from heads to tails. saturation=.1,.9 (or
33 any two numbers between 0 and 1) adjusts the color saturation linearly
34 from least to greatest rank. If Defcolor is set, this color value is
35 applied to any node not otherwise colored.
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38 The following exit values are returned:
39 0 Successful completion.
41 1 If nodes of the graph do not possess a ``pos'' attribute.
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45 It would be nice to make the program work without relying on an initial
46 pass through dot.
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49 Stephen C. North <north@research.att.com>
50 Emden R. Gansner <erg@research.att.com>
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53 gc(1), dot(1), gvpr(1), ccomps(1), sccmap(1), tred(1), libgraph(3)
54 21 March 2001 GVCOLOR(1)