Adrian Custer a écrit :
> In trying to get a projected map for my QuickStart tutorial, I'd like to
> simply grab an existing object. By default the geotools
> DefaultMapContext is created with
>
> CoordinateReferenceSystem crs = DefaultGeographicCRS.WGS84;
>
> I'd like to change that with
>
> myMapCtxt.crs = DefaultProjectedCRS.MERCATOR;
>
> but that kind of thing doesn't exist yet.
>
> It occurs to me that what I really want is a method
> getMercatorCRS(DefaultGeographicCRS.WGS84)
> since a projected mercator crs needs a base CRS of some kind. Is there
> such a method hidden somewhere? Would such a method make sense?
There is nothing like a MERCATOR constant or a getMercatorCRS(...) convenience
method at this time.
This kind of thing could be added. The method arguments would be not only the
base CRS, but also the
various projection parameters like false northing (so a side-effect would be
type safety compared to
invoking ParameterGroup.parameter("falseNorthing").setValue(...)). However, we
would need one method
for every kind of coordinate operation method, since the arguments are specific
to them. We may have
many tens of such methods, and the list is extensible. To we want a Java method
for each coordinate
operation method, or only an arbitrary subset of them, or do we just avoid to
follow such path?
Martin.
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