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=back

=head1 TODO

Add optional bounds to function-based DataSets.

Captitalization for plotType, etc.

Use PDL documentation conventions for signatures, ref, etc.

Additional datset, a two-tone grid. Imagine that you want to overlay the
population density of a country and the average rainfall (at the granularity
of counties, let's say). You could use the intensity of the red channel to
indicate population and the intensity of blue to indicate rainfall. Highly
populated areas with low rainfall would be bright red, while highly populated
areas with high rainfall would be purple, and low populated areas with high
rainfall would be blue. The color scale would be indicated
with a square with a color gradient (rather than a horizontal or vertical bar
with a color gradient, as in a normal ColorGrid). Anyway, this differs from
a normal grid dataset because it would require two datasets, one for each
tone.