[OpenLayers-Users] IE strategies

[Christopher Schmidt]

On Fri, Jan 09, 2009 at 04:18:03PM -0500, Yves Moisan wrote:
> 
> > My bad. It should read
> > new OpenLayers.Strategy.BBOX({invalidBounds: function(){return true;}})
> 
> Well, I was dumb enough to stick it in the Cluster() strategy of my
> 2-strategy layer on my side of the story :-(.  At any rate, I can
> confirm that an XHR is done on zoom in now.
> 
> I still have issues though.  One peculiar thing is that for some reason
> the BBOX issued by OL to the server is consistenly larger than the one
> specified in map.zoomToExtent.  Here are numbers (HTML =
> map.zoomToExtent(new OpenLayers.Bounds()); and "Output BBOX" is sent out
> to the server) :

http://dev.openlayers.org/docs/files/OpenLayers/Strategy/BBOX-js.html#OpenLayers.Strategy.BBOX.ratio

> Case 1 : specified CSS for map <div> : w X h = 512 X 256
> 
> HTML : 26.1925,-10.5710,26.1935,-10.5705
> 
> Output BBOX :
> 26.191626708984373,-10.571436645507813,26.194373291015623,-10.570063354492188
> 
> HTML = previous output BBOX =
> 26.191626708984373,-10.571436645507813,26.194373291015623,-10.570063354492188
> 
> Output BBOX :
> 26.190253417968748,-10.572123291015625,26.195746582031248,-10.569376708984375
> 
> HTML = previous output BBOX =
> 26.190253417968748,-10.572123291015625,26.195746582031248,-10.569376708984375
> 
> Output BBOX :
> 26.187506835937498,-10.57349658203125,26.198493164062498,-10.56800341796875
> 
> Case 2 : Map <div> CSS unspecified (defaults to screen width and some
> height)
> 
> HTML = 26.1925,-10.5710,26.1935,-10.5705
> Output BBOX :
> 26.18567756938934,-10.572552385597229,26.200322430610655,-10.56850761440277
> 
> HTML = previous output BBOX =
> 26.18567756938934,-10.572552385597229,26.200322430610655,-10.56850761440277
> Output BBOX :
> 26.178355138778684,-10.574574771194458,26.20764486122131,-10.566485228805542
> 
> At first, I thought this had to do with me specifying BBOX values that
> didn't quite match the width/height of my div but taking the output BBOX
> and shoving it back into the HTML (which I thought to myself must be
> "OL-compliant" as it generated it) still shows a zooming out behaviour.
> 
> I then figured there might be an interference between the two strategies
> so I tested with BBOX + Cluster and BBOX separately.  Same behaviour.
> 
> There are also issues with the masfeatures parameter : a small number of
> maxfeatures might bring in less features than maxfeatures even though
> the number of features definitely is more than maxfeatures.  To
> illustrate results comparing BBOX alone and Cluster, see :
> 
> http://www.flickr.com/photos/30818159@N05/3182451399/ shows BBOX +
> Cluster (maxFeatures = 200) on the left and BBOX alone on the right.
> Both return 101 features.  Good
> 
> http://www.flickr.com/photos/30818159@N05/3182451587/ shows BBOX +
> Cluster maxFeatures = 200 on the left (results in 101 features) and
> maxFeatures = 10 on the right (results in 9 features ???).  There
> clearly should be 10 features returned.
> 
> Same for BBOX alone (the 9 features are apparent on the right) :
> http://www.flickr.com/photos/30818159@N05/3182451511/
> 
> Thanx to you and Chris,
> 
> Yves
> 
> 
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-- 
Christopher Schmidt
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