# Re: Different-color plots on one set of axes

```Charles Packer wrote:
>
> At Wednesday, 06 February 2002, you wrote:
> >However, the real answer to your problem is to form your
> >lines as Gridded2DSets (if you want lines in 2-D) or
> >Grided3DSets (if you want lines in 3-D), in either case
> >with manifold dimension = 1. You can combine multiple
> >lines in a UnionSet. To get color, use your Set as the
> >domain Set of a FlatField with MathType (e.g., in the
> >3-D case):
> >
> >  ((x, y, z) -> (r, g, b))
> >
> >In your Display, map x -> XAxis, ..., r -> Red, ...
> >In your FlatField, set color values into r, g & b via
> >setSamples().
>
> Could you apply this to the Rivers example? Then I think I would
> understand it. Rivers.java already uses a Unionset, so if you could
> take it from there and make one tributary red and another one blue.

To make each tributary a different solid color, a slightly
different approach is best. For each of the the three Gridded2DSets
in Rivers.java, make it the domain Set of a FlatField of MathType:

((RealType.Latitude, RealType.Longitude) -> (r, g, b))

The for each FlatField create an array values[3][n_samples]
repeating the appropriate values for red, green and blue.
Then construct a FieldImpl with MathType:

(index -> ((RealType.Latitude, RealType.Longitude) -> (r, g, b))

and Integer1DSet(3) for domain Set, and set the three FlatFields
as values via FieldImpl.setSample(i, flat_field_i).

If you want a set of lines in 3-D, replace
(RealType.Latitude, RealType.Longitude) with a 3-D Type and
replace the Gridded2DSets with Gridded3DSets with manifold
dimension = 1.

Good luck,
Bill
----------------------------------------------------------
Bill Hibbard, SSEC, 1225 W. Dayton St., Madison, WI  53706
hibbard@xxxxxxxxxxxxxxxxx  608-263-4427  fax: 608-263-6738
http://www.ssec.wisc.edu/~billh/vis.html

```
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