Simone Giannecchini a écrit :
Hi Martin, Hi list,
I was experiment with the grid coverage renderer and I found that the
attached code does not work with the version I have of epsg-hsql and
epsg-access.
Could anyone check it because it might be an issue related to the fact
that I need to udate the coverage branch to the trunk but it might be
a bug as well.
Hello Simone. I tried yours test case (and added a modified version of
it to the JUnit test suite, to be commited to SVN later). There is two
issues with this test:
* An UTM projection is setup for zone 10, with central meridian 123°W.
Then, this projection is used for transforming coordinates between
9 and 11°E. This is very far from the area of validity of this CRS!
You need to use an UTM projection for the zone to be projected.
Tips: Run yours code with Java assertions enabled (java -ea on the
command line) when debugging. The referencing module while performs
more checks. It will slow down transformations, but you should get
an AssertionError with a (hopefully) explicit message if a coordinate
seems to far from the area of validity.
* The code transform an envelope (fine) and transform it back to the
original CRS (fine), and tests for equality. There is very few chances
that the test for equality returns 'true'. First of all, we will
certainly have rounding errors. Second, a rectangular shape may not
be rectangular anymore after transformation. Taking the envelope of
a non-rectangular shape and transforming it results in a shape
slightly bigger than the original one. This is similar to rounding
a fractional number with Math.ceil(double). So instead of
envelopeAfterTransformations.equals(originalEnvelope);
The following would be more appropriate:
envelopeAfterTransformations.contains(originalEnvelope);
Martin.
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