[OpenLayers-Users] OL and FS - puzzled

[Pierre GIRAUD]

As far as I can remember, there is a ratio option. Here is the
definition given in the code :

"the ratio of image/tile size to map size (this is the untiled buffer)"

Given this, you can set a ratio to 1 and you'll see your 50 markers in
the current visible extent.

A ratio set to 2 prevents the data reload if user pans just a little bit.

Hope this helps.

Regards,
Pierre


On Jan 11, 2008 10:00 AM, Brian Hamlin <maplabs at light42.com> wrote:
> On Jan 10, 2008, at 11:24 PM, Brian Hamlin wrote:
>
> > I have recently hooked up a trivial instance of FeatureServer against a
> > PostGIS data source
> > The WFS GML is being displayed in an OpenLayers display
> >
> > Why arent there as many markers showing in the window as are coming
> > back from the server?
> >
> > I have maxfeatures set to 50...
> > I can see the 50 features coming back as GML, and in fact I can see in
> > the HTML tab of
> > Firebug 50 elements in the SVG for the WFS layer.
> > http;//sial.org/pbot/29762
> >
> > However, there are only 21 markers visible to me in the map div. Are
> > they offscreen?
> >
>
> so yes, with a moments collected thought, I just added the standard svg
> header around that svg node and yes, it displays in a browser window
> standalone. I can now see that aside from the transform="scale(1,-1)"
> there are no other tricky coords going on.. So then I can see that
> indeed, many of the points, perhaps even 29 of them, are outside of the
> viewing area in some way..
>
> So the question simply becomes why?  pre-fetch for better browsing ?..
>
> looks like the span of pts is roughly... double the dimensions ?
>    or a buffer of 400-500 px worth ?
>
> perhaps this is documented behavior, I just havent read everything yet
>
>
> > insights, pointers welcome
>
> -Brian
>
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