[OpenLayers-Users] Problem with WMS.Untiled?

[Christopher Schmidt]

On Fri, Mar 02, 2007 at 03:32:21PM +0000, Jon Blower wrote:
> Dear all,
> 
> I've just upgraded to OpenLayers 2.3 (from 2.1) and I've noticed that
> I can't seem to get a WMS.Untiled layer to display - it just comes up
> blank (or perhaps the URL is constructed wrongly).  In OL2.1 there was
> a problem with click events on the Untiled layer, but now I can't see
> any Untiled layers.

If you are using MapServer, and your map display is wide, you may be
running into a problem with the image size being larger than the 2048 px
that MapServer will render an image by default. To change the Untiled
layer to *not* double the buffer: 

"""
To obtain the behavior of 2.1 in 2.2RC1, you must pass an option of

    'ratio': 1

to the WMS Untiled constructor. This was to correct bad behavior on the
part of the Untiled layer, where the slightest, 1 pixel movement would
cause the entire map to reload, a significant user interaction problem. 
"""

-- http://trac.openlayers.org/ticket/364

I thought I had better documented this, but apparently I haven't. I'm
sorry for the confusion.

> e.g.:
> 
> var human_wms = new OpenLayers.Layer.WMS.Untiled( "Human Footprint",
>         "http://labs.metacarta.com/wms-c/Basic.py?", {layers: 'hfoot' } );
> 
> This works fine as a straight OpenLayers.Layer.WMS.

This is a TileCache Layer. TileCache layers won't work with WMS Untiled. 

-- 
Christopher Schmidt
MetaCarta