[OpenLayers-Users] Tiles outside maxExtent being loaded

[Christopher Schmidt]

On Sun, Jun 01, 2008 at 02:10:46PM +0200, Eric Lemoine wrote:
> On Fri, May 30, 2008 at 4:24 PM, Christopher Schmidt
> <crschmidt at metacarta.com> wrote:
> > On Fri, May 30, 2008 at 01:48:36PM +0100, Jon Blower wrote:
> >> I've noticed that in my application OpenLayers is requesting tiles
> >> outside the maximum extent of my overlay layer (which is in EPSG:4326
> >> and hence has a maxExtent of -180,-90,180,90).  I've checked using the
> >> Firebug console that the maxExtent is correctly set.  wrapDateLine is
> >> set true.
> >
> > wrapDateLine forces displayOutsideMaxExtent, which is why you are seeing
> > the behavior you are seeing.
> 
> Chris, sorry for the stupid question but why does wrapDateLine force
> displayOutsideMaxExtent? What would not function if one creates a
> layer with wrapeDateLine:true and then does
> layer.displayOutsideMaxExtent = false? One will end up with missing
> tiles?

The 'wrapped' tiles are, in actuality, still going from (for example) 
-360 to -180 in the 'mind' of OpenLayers. We just fake the *request*
bbox, not the place the tile actually thinks of itself as being: without
displayOutsideMaxExtent, this obviously wouldn't work.

Regards,
-- 
Christopher Schmidt
MetaCarta