[OpenLayers-Dev] Creating custom 3rd party Layers

[Andrea Battisti]

[...]

>>
>> My guess is that the getURL is meant to be called asynchronously just to 
>> get the link to the image and then exit immediately; then the actual 
>> network transfer is deferred to later methods / calls maybe ?
>>     
>
> Ayup. But keep in mind that at the moment, we don't have any code that
> requests urls from the server asynchronously: I've explicitly avoided
> layers for which that's neccesary because it's painful :)
>
>   

Ok.
I've not clear what is the chain of events that is triggered when the 
map is loaded, or refreshed after a zoom or pan.
The getURL is called, but the image is not downloaded yet; when/who will 
load it in the tiles' src ?
What about tiles? Are they updated in background? How many at a time?

Probably, as you said, it is too complex to getting OL to work in a way 
it was not meant to; maybe I should come up with some sort of 
server-side wrapper that can be queried with an url and gives back an 
image, similar to what a WMS server does.

Thanks,

-- 
Andrea Battisti
Applied Coherent Technology Corp.