[OpenLayers-Dev] bbox strategy and zooming

[Ivan Grcic]

Hi, ive tried Tims patch and i must say im pretty happy with it. Tnx Tim!

I dont need to filter data depending on number of features
(maxfeatures), but to show all the currently available data for area,
then the cluster strategy jumps in and takes care that there are not
too many features rendered. Perfect.

Now the only problem is that one when upon activateing layer, it has
to be nudged a bit for features to load (moveend effect)



On Thu, Nov 13, 2008 at 9:08 PM, Eric Lemoine <eric.c2c at gmail.com> wrote:
> Thanks for putting this patch together Tim.
>
> Initially Chris wanted that the bbox strategy behave aggressively on
> zoom in, but, as an optimization, only if the number of features in
> the layer is not lower than the maxfeatures value set in the protocol.
>
> The change you're proposing wouldn't allow this. The change I proposed
> involved adding a new Integer option to the bbox strategy. If that
> option is null the strategy behaves as currently. If it's non-null
> then it behaves aggressively if the number of features in the layer is
> not lower than the option value.
>
> Chris was concerned with configuration data duplication - maxfeatures
> is kinda set in the protocol as well as in the strategy; which doesn't
> bother me actually.
>
> You may concerned with the fact that my proposed option targets a
> specific case (maxfeatures-parameterized requests) and doesn't address
> other, maybe more common, cases. I actually don't see other cases when
> a more aggressive mode makes sense, but that's probably just me.
>
> Cheers,
>
> Eric
>
> 2008/11/13, Tim Schaub <tschaub at opengeo.org>:
>> Hey-
>>
>> Christopher Schmidt wrote:
>>>
>>> I'm still lost as to how to go about coding what I want :) I want to
>>> have maxfeatures, and more aggressive invalidation because of it. Any
>>> suggestinos as to how I might go about implementing that, or should I
>>> just toss together something and people will look at afterwards?
>>>
>>
>> If you haven't already tossed something together, see the patch for
>> http://trac.openlayers.org/ticket/1830.
>>
>> Set resFactor to 1 if you want to request features with every change in
>> resolution.
>>
>> Tim
>>
>>> Regards,
>>
>>
>> --
>> Tim Schaub
>> OpenGeo - http://opengeo.org
>> Expert service straight from the developers.
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-- 
Ivan Grcic