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

Fri Apr 27 07:26:19 EDT 2007

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.
>> >> >>>
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>> >> >
>> >> >
>> >>
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>> http://www.nabble.com/Turning-on-off-layers-depending-on-zoom-level-tf3550126.html#a10048769
>>
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>> >>
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