Based on Tore's comments, it sounds like it may be a bad idea to change the
northing and easting values if connected to WMS. Is my interpretation
correct? I have an application that defines an initial center, but then may
switch to the other side of the globe. In the cases where the center
changes by a great amount, the rendering in UTMProjection becomes very
"interesting" since the northing and easting values aren't changed. Putting
a new projection into the map bean every time the center changes is my
current solution. Is this bad? If so, do you have any suggestions?
On Fri, Feb 25, 2011 at 8:37 AM, Don Dietrick <dfdietrick_at_gmail.com> wrote:
> This is a good point. Greg, changing the "center" of this projection is not
> the same thing as changing the northing and easting. OM5 lets you change
> the n&e, but that just defines the projection parameters. The view is
> controlled by the center.
>
> -- Don
>
> On Feb 25, 2011, at 3:05 AM, Tore Halset <halset_at_pvv.ntnu.no> wrote:
>
> > Hello.
> >
> > For the WMS, it is important that the UTMProjection can be used with a
> center coordinate outside of the natural UTM zone number. That is, they
> select a fixed EPSG-code and pan outside of the UTM zone area.
> >
> > Regards,
> > - Tore.
> >
> > On Feb 24, 2011, at 22:56 , Don Dietrick wrote:
> >
> >> Hi Greg,
> >>
> >> This was probably an oversight as the OM5 beta has accessors for those
> >> UTMProjection parameters.
> >>
> >> - Don
> >>
> >> On Thu, Feb 24, 2011 at 4:33 PM, Greg Jewell <greg17_at_jewell.net> wrote:
> >>> Hello,
> >>>
> >>> I have a question about the implementation of UTMProjection in OM
> 4.6.5.
> >>> The fields zone_number, isnorthern, and ellps are set in the
> constructor.
> >>> These values are used in several methods of the class. However, a
> later
> >>> change to the center of the projection never updates these values. The
> >>> fields are private, and setCenter(LatLonPoint llp) isn't overridden.
> Was
> >>> this intentional, or just an oversight? Right now, every time the
> center
> >>> changes (through user panning or other means), I create an entirely new
> >>> UTMProjection instance and give it to the MapBean. The other option is
> to
> >>> subclass UTMProjection, but I'd have to essentially copy the entire
> class
> >>> and add an overridden setCenter method.
> >>>
> >>> If this behavior was intentional, will my workarounds cause any
> problems?
> >>>
> >>>
> >>> Thanks,
> >>> Greg Jewell
> >>>
> >>>
> >>
> >> --
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> >>
> >
>
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Received on Fri Feb 25 2011 - 10:13:37 EST