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

[kaka]

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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