grid - world coord conversion methods for GridCoverage2D
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Key: GEOT-2666
URL: http://jira.codehaus.org/browse/GEOT-2666
Project: GeoTools
Issue Type: Improvement
Components: core coverage
Reporter: Michael Bedward
Assignee: Michael Bedward
Priority: Minor
Attachments: coverage-grid2world.patch
Converting between grid and world coordinates can be tricky with the various
options of PixelOrientation, definitions of inclusiveness etc.
After stuffing this one in my own code for the 1000th time I've written methods
for GridCoverage2D to handle conversions for points and rectangles which adhere
to (hopefully) commonly useful conventions. The new methods are:
- GridCoordinates2D worldToGrid(DirectPosition point) : returns the coords of
the grid cell containing this point
- GridEnvelope2D worldToGrid(Envelope2D env) : returns the rectangle of grid
cells that intersect the input envelope
- DirectPosition gridToWorld(GridCoordinates2D point) : returns the world
coords of the grid cell centre
- Envelope2D gridToWorld(GridEnvelope2D env) : returns the bounding rectangle
(outer grid cell edges) in world coords
The attached patch contains these methods as well as unit tests and some minor
mods to GridGeometry2D.
I'm unsure if GridCoverage2D is a good place for these methods or if they would
better put in a helper class. I'm also unsure whether they correctly deal with
all combinations of grid and world dimension order.
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