[OpenLayers-Dev] Creating custom 3rd party Layers

[Erik Uzureau]

If your layer will be tiled, then I think a good place to start
looking is at the Grid.js class... that's where the tilling logic
is located. EventPane.js is a class for 3rd party layers that
have their own API and mousing controls, etc.

--E

On 1/24/08, Andrea Battisti <battisti at actgate.com> wrote:
> Hi all,
>
> I recently very much appreciated the OL's ability to connect to and
> display different kind of layers on a web page.
>
> I was wondering how difficult is to extend it to make use of third party
> geospatial data and protocols.
> I took a quick look at some of the 3rd party implementations (i.e. the
> WMS and Google classes ...) but what I miss is the general understanding
> of the whole process of requesting tiles, and the "behind the scenes"
> working of the Layer class and subclasses.
> (i.e. I didn't find in the WMS implementation (WMS.js) where the actual
> GetMap request is built and performed.)
>
> First of all, what is the base class to inherit from, in order to create
> a custom layer?
> I guess it is OpenLayers.Layer.EventPane as it is written in the doc,
> but is there a simple example to start with?
>
> Basically for each tile I have to build a formatted request string
> specifying the spatial bounds, projection and some options, submit the
> request using http, reading and parsing the reply and extracting from it
> an url pointing to the actual image data to be displayed.
>
>
> Thanks in advance!
> Best,
>
> --
> Andrea Battisti
> Applied Coherent Technology Corp.
>
>
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