[OpenLayers-Users] Fwd: Turning on/off layers depending on zoom level

Fri Apr 27 11:35:02 EDT 2007

How to Apply a patch:
http://trac.openlayers.org/wiki/ApplyingPatches

Made to order :-)


On 4/27/07, kaka <drspencer at hotmail.com> wrote:
>
>
> Thanks for your reply and bug report. No, I am not sure of how to apply a
> patch, is there documentation on this somewhere?
>
> Magnus
>
>
>
> Erik Uzureau-3 wrote:
> >
> > sending again without the build OL patch -- msg too big for list :-)
> > erik
> >
> > ---------- Forwarded message ----------
> > From: Erik Uzureau <erik.uzureau at metacarta.com>
> > Date: Apr 25, 2007 8:15 PM
> > Subject: Re: [OpenLayers-Users] Turning on/off layers depending on zoom
> > level
> > To: kaka <drspencer at hotmail.com>
> > Cc: users at openlayers.org
> >
> > Hello,
> >
> > I have found some more time to look at this, and with your helpful
> > description I think I am able to see the problem (and maybe solve it).
> >
> > The problem is that if the layer is out of range to start with, we never
> > hide it. That's not good.
> >
> > I am including a patch that seems to fix this problem in your code.
> >
> > Can you tell me if this fixes it for you?
> >
> > If you don't know how to apply patches, I've also included a freshly
> build
> > OL from trunk with this patch put in.
> >
> > Please let me know if this fixes your problem. I would like to open a
> > ticket
> > for this bug. It won't make it into the 2.4 release but in 2.5 for sure.
> >
> > Thanks for your bug report and your patience with explaining it :-)
> > Erik
> >
> > On 4/22/07, kaka <drspencer at hotmail.com> wrote:
> >>
> >>
> >> The problems I have with the maxResolution are:
> >>
> >> a) the markers are dislocated. Have a look at the link I posted and try
> >> zooming out - the markers end up in the wrong positions.
> >>
> >> b) the markers are visible when thy should not appear. I would like
> them
> >> to
> >> appear when I zoom in the map, and not on first load. However, I keep
> >> having
> >> trouble with this. If they are set to show in the 0.03 resolution, the
> >> example works just fine. If I set them to 0.02, or any other resolution
> >> that
> >> should make them not to render on first load, the example does no
> longer
> >> work as expected. The markers are drawn anyway and in the wrong
> location
> >> as
> >> mentioned in a).
> >>
> >> Any help appreciated.
> >>
> >> Magnus
> >>
> >>
> >>
> >> Erik Uzureau-3 wrote:
> >> >
> >> > Kaka,
> >> >
> >> > It is hard for people to help you because we need a more detailed
> >> > description of the problem.
> >> > I personally do not understand what is going wrong here.
> >> > Erik
> >> >
> >> > On 4/17/07, kaka <drspencer at hotmail.com> wrote:
> >> >>
> >> >>
> >> >> Any help on this issue would be greatly appreciated. Could it be
> that
> >> >> this
> >> >> is
> >> >> a bug? The example is over at
> >> >> http://www.villageografica.com/test44/Africa-test.html and my
> problem
> >> is
> >> >> that the maxResolution doesn´t work with the zoom ranges I want and,
> >> >> also,
> >> >> that the markers are not in the correct position.
> >> >>
> >> >> Magnus
> >> >>
> >> >>
> >> >>
> >> >>
> >> >> kaka wrote:
> >> >> >
> >> >> > This is an example of the problem I have:
> >> >> >
> >> >> > http://www.villageografica.com/test44/Africa-test.html
> >> >> >
> >> >> > If I change the maxResolution to 0.2 the map works fine, but its
> >> >> current
> >> >> > 0.3 won´t work. I hope this illustrates my problem.
> >> >> >
> >> >> > Magnus
> >> >> >
> >> >> >
> >> >> >
> >> >> > Erik Uzureau-3 wrote:
> >> >> >>
> >> >> >> Dear Kaka,
> >> >> >>
> >> >> >> Do you have a live example that you could post a link to?
> >> >> >> Offhand, I can't see what the problem is... but I might be
> >> >> >> able to help you out if I could see it in action
> >> >> >>
> >> >> >> Erik,
> >> >> >> Best
> >> >> >>
> >> >> >> On 4/10/07, kaka <drspencer at hotmail.com> wrote:
> >> >> >>>
> >> >> >>> Thank you very much, Erik, this has been a great help. However,
> I
> >> >> have
> >> >> >>> run
> >> >> >>> into a problem. If the markers are set to not show on first
> load,
> >> but
> >> >> to
> >> >> >>> appear when zooming in, the show/hide functionality stops
> working
> >> and
> >> >> >>> the
> >> >> >>> markers are dislocated when zooming out. My code looks like
> this:
> >> >> >>>
> >> >> >>> var MarkersLayer2 = new OpenLayers.Layer.Text( "Region info",
> >> >> {location:
> >> >> >>> "markers.txt", maxResolution: 0.03});
> >> >> >>>
> >> >> >>> Changing the "0.3" to "0.2" causes the problems mentioned above.
> >> Is
> >>
> >> >> this
> >> >> >>> related to my code or a possible bug?
> >> >> >>>
> >> >> >>> Magnus
> >> >> >>>
> >> >> >>>
> >> >> >>>
> >> >> >>>
> >> >> >>> kaka wrote:
> >> >> >>> >
> >> >> >>> > Hi
> >> >> >>> > I am trying to turn on/off a layer of markers depending on
> zoom
> >> >> level,
> >> >> >>> > using google maps as a background layer. Does anyone have
> >> >> suggestions
> >> >> >>> on
> >> >> >>> > how to achieve this or is there or maybe an example? Thank you
> >> for
> >> >> any
> >> >> >>> > ideas.
> >> >> >>> >
> >> >> >>> > Regards,
> >> >> >>> >
> >> >> >>> > Magnus
> >> >> >>> >
> >> >> >>>
> >> >> >>> --
> >> >> >>> View this message in context:
> >> >> >>>
> >> >>
> >>
> http://www.nabble.com/Turning-on-off-layers-depending-on-zoom-level-tf3550126.html#a9927966
> >>
> >> >> >>> Sent from the OpenLayers Users mailing list archive at
> Nabble.com.
> >> >> >>>
> >> >> >>> _______________________________________________
> >> >> >>> Users mailing list
> >> >> >>> Users at openlayers.org
> >> >> >>> http://openlayers.org/mailman/listinfo/users
> >> >> >>>
> >> >> >> _______________________________________________
> >> >> >> Users mailing list
> >> >> >> Users at openlayers.org
> >> >> >> http://openlayers.org/mailman/listinfo/users
> >> >> >>
> >> >> >>
> >> >> >
> >> >> >
> >> >>
> >> >> --
> >> >> View this message in context:
> >> >>
> >>
> http://www.nabble.com/Turning-on-off-layers-depending-on-zoom-level-tf3550126.html#a10048769
> >>
> >> >> Sent from the OpenLayers Users mailing list archive at Nabble.com.
> >> >>
> >> >> _______________________________________________
> >> >> Users mailing list
> >> >> Users at openlayers.org
> >> >> http://openlayers.org/mailman/listinfo/users
> >> >>
> >> >
> >> > _______________________________________________
> >> > Users mailing list
> >> > Users at openlayers.org
> >> > http://openlayers.org/mailman/listinfo/users
> >> >
> >> >
> >>
> >> --
> >> View this message in context:
> >>
> http://www.nabble.com/Turning-on-off-layers-depending-on-zoom-level-tf3550126.html#a10129213
> >>
> >> Sent from the OpenLayers Users mailing list archive at Nabble.com.
> >>
> >> _______________________________________________
> >> Users mailing list
> >> Users at openlayers.org
> >> http://openlayers.org/mailman/listinfo/users
> >>
> >
> >
> > _______________________________________________
> > Users mailing list
> > Users at openlayers.org
> > http://openlayers.org/mailman/listinfo/users
> >
> >
>
> --
> View this message in context:
> http://www.nabble.com/Turning-on-off-layers-depending-on-zoom-level-tf3550126.html#a10217404
> Sent from the OpenLayers Users mailing list archive at Nabble.com.
>
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>
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