[OpenLayers-Dev] Cluster strategy getResolution bug ?

[Alexandre Dube]

Hi Eric,

  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, 
250, 100]

  So I expect the vector layer to have the good corresponding 
resolutions, but it hasn't.  Maybe that is the issue.  Any thoughts ?

Alexandre

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
> this.layer.getResolution.
>
> I'd really like to hear what others think about that.
>
> Cheers,
>
> Eric
>
> 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 =
>> *this*.layer.getResolution();
>>
>>   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
>> Mapgears
>> www.mapgears.com
>>
>> _______________________________________________
>> Dev mailing list
>> Dev at openlayers.org
>> http://openlayers.org/mailman/listinfo/dev
>>
>>     


-- 
Alexandre Dubé
Mapgears
www.mapgears.com