Jay Askren a écrit :
> I'm looking at the old and new code for JMapPane and had a couple of
> questions. First, why is the new version so slow? On the new version,
> when I zoom in and out or pan it takes 60 seconds or more before
> anything happens at all. By the time it finishes I've about forgotten
> what action I was even running. The old version didn't seem to have
> that lag. Also, I notice the old version inherits from ZoomPane and
> the new version does not. I did notice that ZoomPane inherits from a
> deprecated interface. But that is an easy fix since it appears a newer
> version of that interface can be found in the same package. Is there
> any reason for not using ZoomPane? Thanks.
Sorry for the delay; I'm just back to an internet connection.
The old MapPane was build on top of "J2D-Renderer", a quite sophesticated
renderer engine with a lot of optimisation. The code was probably ten time
bigger than JMapPane. Unfortunatly, it was build on legacy Coordinate
Transformation Service (CTS) and Grid Coverage (GC) implementations. I was
suppose to port them to the new CRS and GridCoverage implementations, but never
had the time. A few months ago, the Geotools PMC decided to delete the legacy
CTS and GC implementations; it was the gt2-legacy module. As a consequence, it
was not possible to compile the old MapPane anymore.
A new implementation is under way in the GO-1 module:
http://maven.geotools.fr/reports/go/
but we are facing the same problem: I'm missing time for this work (already
busy
with other Geotools issues), and this work is quite hard to split among many
contributors since this renderer is non-trivial...
Martin
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