minScale and maxScale or minResolution and maxResolution should do the
trick.
function layerGML_BW(title, url, projection)
{
var lyr = new OpenLayers.Layer.Vector(title , {
minScale : 4000,
maxScale : 50,
projection: projection,
strategies: [new OpenLayers.Strategy.Fixed()],
protocol: new OpenLayers.Protocol.HTTP({
url: url,
format: new OpenLayers.Format.GML({
extractAttributes: true
})
})
});
return(lyr);
}
from http://gis.ibbeck.de/ginfo/apps/planwerk/planwerk_nordbahntrasse.asp
if you zoom into the small recangles, a layer with labels will show up.
Arnd
_____
Von: [email protected] [mailto:[email protected]] Im
Auftrag von Lammie Jonson
Gesendet: Donnerstag, 17. Dezember 2009 22:33
An: [email protected]
Betreff: [OpenLayers-Users] rendering WFS and vectors based on zoom levels
I figured out how to render WFS from my website using a proxy. The browser
will send a request like this
to the server:
Parameters: {"url"=>"http://mysite.com?typename=topp%3Astates
<http://mysite.com?typename=topp%3Astates&SERVICE=WFS&VERSION=1.0.0&REQUEST=
GetFeature&SRS=EPSG%3A4326&BBOX=-570.9375,-457.646484375,819.84375,380.47851
5625>
&SERVICE=WFS&VERSION=1.0.0&REQUEST=GetFeature&SRS=EPSG%3A4326&BBOX=-570.9375
,-457.646484375,819.84375,380.478515625"}
Suppose I only want the content rendered through WFS to only be visible at
lower zoom levels, is there a way to indicate this in openlayers in the
constructor for the WFS layer ?
I would like to also be able to do that for any other vector data as well.
I could do this in a variety of ways using session data through a cookie or
by somehow checking the map zoom level whenever the map moves. In the case
of WFS, maybe I could somehow figure out the zoom level from the bounding
box, but if there is a more transparent way to do that I would like to do it
that way or whatever is the preferred cleaner approach, etc.
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