Interpolate function as per Symbology Encoding 1.1
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Key: GEOT-3001
URL: http://jira.codehaus.org/browse/GEOT-3001
Project: GeoTools
Issue Type: New Feature
Reporter: Michael Bedward
Assignee: Andrea Aime
Attachments: se_functions.patch
The attached patch is a first go at implementing the Interpolate function for
numeric and colour interpolation. Please review it carefully as I expect many
changes and improvements will be required. The patch also has a new version of
the unit tests for the Categorize function but more work is required for them
(and probably that function).
Some design issues:
The SE 1.1 spec defines two optional parameters for this function: method
("numeric" or "color") and mode ("linear", "cosine" or "cubic"). Surely these
terms are the wrong way round (?)
The cubic algorithm used was chosen for its simplicity and, hopefully, speed
relative to more complex cubic spline algorithms, but I've only assessed its
performance briefly and qualitatively.
The cubic algorithm requires at least 4 interpolation points. If less than 4
are provided the function falls back to cosine interpolation - is this
reasonable ?
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