[OpenLayers-Dev] Making BBOX strategy smarter - part2

[Ivan Grcic]

Tnx XinGang, maybe i try that also.To prevent making too many requests
for new data when im zoomed in, ill set bigger ratio. When im zoomed
out ill set lower ratio...

Greetings,
Ivan

On Thu, Nov 13, 2008 at 3:33 PM, XinGang Li <slinavlee at gmail.com> wrote:
> For large data, may be you can change the ratio depend on the map zoom
> level.
>
> On Thu, Nov 13, 2008 at 7:37 PM, Ivan Grcic <ivan.grcic at geofoto.hr> wrote:
>>
>> ...and now when i lowered the ratio on bbox strategy, i can see big
>> difference in refreshing the data (discarding old ones, fetchin new
>> ones)
>> Before i didnt see it because it was always fetching data for much bigger
>> area.
>>
>> So now I can say that bbox strategy works pretty well for me!
>>
>> On Thu, Nov 13, 2008 at 12:32 PM, Ivan Grcic <ivan.grcic at geofoto.hr>
>> wrote:
>> > Hi, i just saw that by default bbox has a ratio parameter:2 Creating
>> > bbox strategy with lower value did a lot of improvement for me, since
>> > it fetches much less data (filtering it)
>> > The improvement is off course noticable more on larger scales (zoomed
>> > out)
>> >
>> > new OpenLayers.Strategy.BBOX({ratio:1.4}
>> >
>> > Regards, Ivan
>> >
>> > On Thu, Nov 13, 2008 at 12:04 AM, Christopher Schmidt
>> > <crschmidt at metacarta.com> wrote:
>> >> On Wed, Nov 12, 2008 at 11:20:00PM +0100, Ivan Grcic wrote:
>> >>> This post continues on previous discussion opened under name "bbox
>> >>> strategy and zooming"
>> >>>
>> >>> OK, I made a little mess here :) Im pretty new with this, so I still
>> >>> dont know really well how things function.
>> >>>
>> >>> > Tim says
>> >>> > Keep in mind that the cluster strategy doesn't know anything about
>> >>> > bbox, and vice-versa.
>> >>> So what  bbox does, is fetching the data, and cluster is then, well
>> >>> clustering that data? (without getting any new data, cuz thats bbox'es
>> >>> work)
>> >>> So on layer pan/zoom, first bbox is activated to fetch, and then
>> >>> cluster to process. Did i get it right?
>> >>>
>> >>> Well knowing that, then thers not so much to say about Cluster
>> >>> strategy. Its allready doing its job pretty well.
>> >>>
>> >>> Its only about making bbox more efficient, cuz of reasons that
>> >>> Tim/Christopher said:
>> >>>
>> >>> Tim said:
>> >>> > I want to have maxfeatures, and more aggressive invalidation because
>> >>> > of it.
>> >>>
>> >>> Christopher said (thats my case btw)
>> >>> > Someone else might have a specific need to make the strategy more
>> >>> > aggressive because the server returns more detailed data based on
>> >>> > the
>> >>> > extent of the request (I don't know, just making things up here).
>> >>
>> >> These are actually reversed -- I'm Tim above, and Tim is Me.
>> >>
>> >> Regards,
>> >> --
>> >> Christopher Schmidt
>> >> MetaCarta
>> >>
>> >
>> >
>> >
>> > --
>> > Ivan Grcic
>> >
>>
>>
>>
>> --
>> Ivan Grcic
>> _______________________________________________
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>> http://openlayers.org/mailman/listinfo/dev
>
>
>
> --
> Li XinGang
> EMail: slinavlee at gmail.com
> Blog:   avlee.cnblogs.com
> Site:    www.mapboost.org.cn
>



-- 
Ivan Grcic