Joseph Lisee dec02fd972 Declarative UI region based plots - spec & builder (#212)
This allows you to plot regions in an X, Y space, with defined upper
and lower Y bounds over a provided range of X values.  These are
helpful when reasoning about particular complex optimization problems.

These are created by specifying the 3 XVIZ variable streams that
define the x coordinates, y minimum, and y maximum.  These streams can
have multiple objects as long as the same objects exist on all
streams.

Styling is done by applying styles to the `x` variable stream objects.
2018-11-23 14:17:27 -05:00
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