[OpenLayers-Users] Implementing a layer for a proprietary WMS-like service

[Bart van den Eijnden (OSGIS)]

Hi,

I would advise you to look at OpenLayers.Layer.ArcIMS which uses a similar
approach.

Best regards,
Bart

> Hi,
>
> I'm a frontend developer and was programming a web viewer for a
> proprietary,
> WMS-like map service.
> I discovered Openlayers one month ago and I'm really fascinated by its
> awesome capabilities, so I decided to integrate our map service in
> OpenLayers.
>
> Here is a short description how the map service works:
>
> The client sends an AJAX request containing the current map bounds, the
> map
> id and the pixel size of the map.
> map=22&px=1720&py=833&left=2504400&right=2544000&top=5699500&bottom=5669500&type=0
>
> The server responds with the generated map image (url) and the corrected
> bounds:
> <MapProperties>
>   <mapLeft>2493227.6110444176</mapLeft>
>   <mapTop>5699500</mapTop>
>   <mapRight>2555172.3889555824</mapRight>
>   <mapBottom>5669500</mapBottom>
>   <mapType>0</mapType>
>   <overviewMap>22</overviewMap>
>   <url>http://localhost/cgmCache/41600065-c3d2-4934-9feb-78a32f6668c8.png
> </url>
> </MapProperties>
>
> The maps are always single-tiled.
>
> My first approach was to write a ProprietaryMapLayer, that executes the
> map
> request and creates an ImageLayer with the result url and its bounds.
> When the ImageLayer is moved, a new request is performed, the current
> ImageLayer is destroyed and a new one generated. The disadvantage: there
> are
> now 2 layers representing one map, which leads to confusion in the layer
> switcher control.
>
> I read over the code of Layer.WMS, which inherits from Layer.Grid and also
> makes use of Tile.Image, but it's difficult to derive a solution from it,
> since all the request/response handling is already integrated into the
> layer. Furthermore, WMS simply responds with tile images, whereas I have
> to
> deal with an xml response.
>
> Any ideas how I could implement my layer?
>
> kind regards,
>
> Franz
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>


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Bart van den Eijnden
OSGIS
bartvde at osgis.nl