08-18-2012
What I usually see done for this is plotting different graphs for different values, making mathematical functions that exclude the data above and below certain values (i.e. making it discontiguous).
Another option would be using pm3d, which would let the colors change smoothly. But using pm3d pretty much means you're doing everything freeform 3d, and have to start worrying about whether your polygons are thick enough to be seen as lines etc.
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Name............................Size
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LEARN ABOUT CENTOS
gvcolor
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
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.
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)