[OpenLayers-Users] SingleTile TMS Layer - Suggestion

[RFeagin]

Yes a 'snap to grid' setting for singleTile is what I'm looking for.

I can't (efficiently) use tiles for this layer because it is a dynamically
generated 'heat map' that I'm creating in a wms-like .net web service. 
Rendering it as individual tiles returns a very different image and I'd
rather not render the entire image over and over only to clip it to the part
I need. I guess I could expand the bounding box to half of each of the
surrounding tiles and clip it, but that seems like a waste of resources.

Probably not the best explaination, but here is a link to the basic concept
(I changed mine to cluster and aggregate the data using the layer resolution
in the database to avoid all the looping).
http://dylanvester.com/post/Creating-Heat-Maps-with-NET-20-(C-Sharp).aspx

Thanks for the 'ratio' tip... I'll check it out.




Christopher Schmidt-2 wrote:
> 
> On Thu, May 14, 2009 at 05:23:21PM -0700, RFeagin wrote:
>> 
>> I have been playing around a little bit with the singleTile option and
>> have a
>> suggestion for a change.  Unfortuanatly I haven't had the time to dig
>> into
>> the code to try making the change or to see how much work it would take. 
>> But I thought that maybe someone else has already done this or that there
>> might be a reason why no one has. 
>> 
>> I think it would be better if the bounds used for a singleTile layer were
>> the bounds of the loaded tiles in the base layer instead of only the
>> visible
>> part of the map.  This way panning a few pixels one way or another
>> wouldn't
>> need to refresh the layer and more importantly, we can take more
>> advantage
>> of browser caching. 
> 
> What you're describing sounds vaugely like a 'snap to grid' setting for
> singleTile mode. Out of curiousity, why not simply... use tiles, if what
> you want is a gridded output which takes advantage of the browser cache?
> 
> Also, the 'ratio' parameter allows you to prevent a re-request of tiles
> when you only drag 'a few pixels'.
> 
> -- Chris
> 
>> If someone has already done this, please respond with a link to a patch
>> or
>> sample of the code changes. And if this can't be done for some reason or
>> if
>> it is a much bigger can of worms than it seems to be, I'd appreciate
>> being
>> told that too. 
>> 
>> Thanks 
>> -- 
>> View this message in context:
>> http://n2.nabble.com/SingleTile-TMS-Layer---Suggestion-tp2905137p2905137.html
>> Sent from the OpenLayers Users mailing list archive at Nabble.com.
>> 
>> _______________________________________________
>> Users mailing list
>> Users at openlayers.org
>> http://openlayers.org/mailman/listinfo/users
> 
> -- 
> Christopher Schmidt
> MetaCarta
> _______________________________________________
> Users mailing list
> Users at openlayers.org
> http://openlayers.org/mailman/listinfo/users
> 
> 

-- 
View this message in context: http://n2.nabble.com/SingleTile-TMS-Layer---Suggestion-tp2905137p2905304.html
Sent from the OpenLayers Users mailing list archive at Nabble.com.