[OpenLayers-Dev] Cluster strategy getResolution bug ?
adube at mapgears.com
Mon Nov 10 09:21:29 EST 2008
Ok, I understand what you mean. But I already set specific scales to
the vector layer that are supposed to give the same resolutions I need.
I mean :
Base layer (map) has scales in its options: [ 100000, 50000, 25000,
10000, 5000, 2500, 1000, 500, 250, 100]
Vector layer has scales in its options: [10000, 5000, 2500, 1000, 500,
So I expect the vector layer to have the good corresponding
resolutions, but it hasn't. Maybe that is the issue. Any thoughts ?
Eric Lemoine wrote:
> Hi Alexandre
> If you want your vector layer to be visible only for a subset of the
> base layer's resolutions you should set maxResolution and/or
> minResolution in your vector layer options.
> If you pass an array of resolutions to the vector layer, you can end
> up with vectorlayer.resolutions[i] != baselayer.resolutions[i], where
> i is any index of the vector layer's resolutions array.
> And I think you are hitting the above case, which is making the
> cluster strategy doesn't behave as you expect it to.
> So I don't see anything wrong with the cluster strategy relying on
> I'd really like to hear what others think about that.
> 2008/11/7, Alexandre Dube <adube at mapgears.com>:
>> Hi devs,
>> I got a problem using the cluster strategy. At first, it didn't
>> seemed to work at all. I always got the same number of feature with or
>> without the cluster strategy applied. After a few search, I found out
>> the problem was at line 143 : *var* resolution =
>> I just replaced the line for : *var* resolution =
>> *this*.layer.map.getResolution(); and it worked.
>> The reason is :
>> My base layer has 10 fixed scales ( which gives 10 resolutions), from
>> 0 to 9. My vector layer has only 7, which represents resolutions 3 to 9
>> of the base layer's scales, but the vector layer itself has his own
>> scales array from 0 to 6. So, the line 143 which called resolution 3
>> from the base layer calls resolution 3 from the vector layer, which is
>> wrong !
>> Anyone else noticed this ?
>> Alexandre Dubé
>> Dev mailing list
>> Dev at openlayers.org
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