[OpenLayers-Users] WMSGetFeatureInfo + xy mouse coordinates, can this be done?

[Andrew Stewart]

Actually I modified the strategies to be -


strategies: [

new OpenLayers.Strategy.Fixed(),

new OpenLayers.Strategy.Cluster()

],



Now I am getting the points showing up but there is still quite a delay in loading / zooming etc. Is there anyway I can optimize this further by limiting features etc?



________________________________
From: openlayers-users-bounces at lists.osgeo.org [mailto:openlayers-users-bounces at lists.osgeo.org] On Behalf Of Andrew Stewart
Sent: March 01, 2011 11:31 AM
To: openlayers-users at lists.osgeo.org
Subject: RE: [OpenLayers-Users] WMSGetFeatureInfo + xy mouse coordinates, can this be done?

So I am having success with point features below 100.. but is it also possible to use this with many point features (several thousand?)

My code below is trying to use the cluster strategy.. previously it was Fixed but that causes my map to freeze when loading the several thousand points. But when I switch to cluster nothing happens and no points appear, any advice on what I'm doing wrong?


 //Hydrant
   var test_hydrants = new OpenLayers.Layer.Vector("Hydrant", {


        strategies: [new OpenLayers.Strategy.Cluster()],

        protocol: new OpenLayers.Protocol.WFS({
            url: wfs,
            featureType: "Hydrants",
            featureNS: "http://www.intergraph.com/geomedia/gml",
            featurePrefix: "gmgml",
            srsName: "EPSG:3776",
            //filter: filter,
            geometryName: "Geometry",
            version: "1.1.0"
        })
    });

           //Add Vector Layers to Map
       map.addLayer(test_hydrants);




________________________________
From: openlayers-users-bounces at lists.osgeo.org [mailto:openlayers-users-bounces at lists.osgeo.org] On Behalf Of Alexandre Dube
Sent: March 01, 2011 7:52 AM
To: openlayers-users at lists.osgeo.org
Subject: Re: [OpenLayers-Users] WMSGetFeatureInfo + xy mouse coordinates, can this be done?

50~ shouldn't be a problem.  IMHO, it would be a good idea to make the switch to WFS.

Cheers,

Alexandre

On 11-03-01 09:39 AM, Andrew Stewart wrote:


Ok thanks.. So basically if my web service does not support tolerance (which I'm pretty sure is the case) then there is not much I can do with openlayers to fix this problem.. Besides possibly changing my features into markers from my WFS and giving those markers tooltips/hotspots but not sure what the performance would be on that since I need sometimes 50+ markers.


-----Original Message-----
From: openlayers-users-bounces at lists.osgeo.org<mailto:openlayers-users-bounces at lists.osgeo.org> [mailto:openlayers-users-bounces at lists.osgeo.org] On Behalf Of Alexandre Dube
Sent: March 01, 2011 6:49 AM
To: openlayers-users at lists.osgeo.org<mailto:openlayers-users at lists.osgeo.org>
Subject: Re: [OpenLayers-Users] WMSGetFeatureInfo + xy mouse coordinates, can this be done?

Hi,

That could be setup in your web mapping service. If you use MapServer,
you could set the Layer object definition "TOLERANCE" parameter for that.

Regards,

Alexandre

[1] http://mapserver.org/mapfile/layer.html (search for "TOLERANCE")


On 11-02-28 10:02 PM, Planet)x wrote:


I have a slight problem which has to do with my WMS mainly but wondering if
there is a way to program around it. Well problem is I can increase the
symbol size for points on my Web service but the geometry of the point
(centroid) remains the same. Therefore when using a
OpenLayers.Control.WMSGetFeatureInfo the feature info is never returned
until I move the mouse directly in the middle of the point feature (and also
lines unfortunately). Question is can I somehow force the mouse to be moved
to the center of the point when it nears a symbol.. and is there anyway to
actually get the entire coordinates for the symbol so I can use them to do
the featureinfo somehow? Not sure if this makes sense or if there is another
approach I can utilize to do this.. appreciate any advice!




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--
Alexandre Dubé
Mapgears
www.mapgears.com<http://www.mapgears.com>


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