[OpenLayers-Users] Alignment of WMS layers

[Ben Madin]

G'day all,

I am having a problem with the position of boxes on the screen being  
offset from their (supposed) location and the reported  
MousePosition(). This does matter because at some zoom scales you  
actually need to click to the North-West (so to speak) of the box to  
get the feature info returned.

The attached pictures show the (apparent) centre of the box, and the  
mouse hovering over it.

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I'm sure this is something simple, but I have a number of polygons in  
a postgis table (EPSG:4326). In fact, I would rather use just x and y,  
but the original data was all in both positive and negative points.

I should also admit that I am setting the extent rather larger than a  
normal 'earth' range (	map.maxExtent = new  
OpenLayers.Bounds(-500,-300,500,300);)

The polygons are all contrived (rectangles centred on a user defined  
point - I'm moving boxes around the screen) and are 15px x 10px.

I have a MapServer mapfile (with map and layer projects objects epsg: 
4326 and  "wms_srs" "4326" in the layer metadata

I also have openlayers layers that look like this :

	var shortedges = new OpenLayers.Layer.WMS(
		'Short Edges',
		wmsserver + '?map=' + mapfile + '&',
		  {transparent: 'true', layers: 'shortedges', GRAPHID: graphid,  
isBaseLayer: 'true', version: '1.1.1', srs: 'EPSG:4326'},
		  {singleTile: true'}
	);
	shortedges.isBaseLayer = true;
	shortedges.visibility = true;
	map.addLayer(shortedges);

The only reference I could find suggested that I add a text-align:  
left to the map css definition. Didn't make a whole lot of sense, I  
have done it, and it didn't work.

I hope someone can point me in the right direction here.

cheers

Ben




-- 

Ben Madin
AusVet Animal Health Services
P.O. Box 5467
Broome   WA   6725
Australia

t : +61 8 9192 5455
f : +61 8 9192 5535
m : 0448 887 220
e : ben at ausvet.com.au

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