= Overview =

Create nice stream graphs from a set of data points.

The current implementation is a bit hackish and meant to try out some
of the ideas so a real implementation can be constructed.

You can read about stream graphs here:
  http://www.leebyron.com/else/streamgraph/

= TODO =

* Fix the bugs!

* Make the example executable in the cabal file depend on the library
  in the cabal file.

* Implement nicer color sets.  The current example uses the predefined
  names in the wumpus library, but those are more for debugging and
  look painful together.  How do people implement color palette
  pickers?  This can't be too difficult.  How does
  http://colorlovers.com do it?

* Import the data points from outside and create time series from
  them.

* Generalize the current band* functions.  This is probably as simple
  as doing a zipWith on the time series and the tail of the time
  series.

= Known Bugs =

* The function band1 seems to have a bug with how you specify points.
  It's currently very easy to specify points beyond the end of the
  defined set.  That's why the upper bound inside of band1 is
  currently 800 instead of 1000.

* No tests yet.

* Between is partial, but it should have type:
  between :: [(Double, Double)] -> Double -> Maybe ((Double,Double), (Double, Double))

* lerpFromPoints should be modified to do something intelligent when a
  point is requested outside of the specified domain.  Perhaps return
  Nothing?