[OpenLayers-Users] Release?

[Christopher Schmidt]

On Thu, Jun 22, 2006 at 11:30:44AM -0600, Corey Puffalt wrote:
> Schuyler,
> 
> Thanks for your reply.
> 
> On 6/22/06, Schuyler Erle <sderle at metacarta.com> wrote:
> >
> >Actually IE6 compatibility is of enormous importance to us. Can you
> >give us a clear idea of the problems you are encountering?
> 
> 
> Good to hear that.  I have come across two issues.  I've just submitted
> tickets for both of them: #95 & #96.  The first one is that the MouseToolbar
> buttons don't change state visibly when the user clicks on them although
> they are otherwise functional.  The second one is a little more subtle (at
> least if you're using layers that render quickly):  I've found that under
> IE6 the map does not refresh until all the image tiles are loaded.  With a
> slow map server this makes a huge difference to the perceived responsiveness
> of the map.  I played with Google Maps for a while and it looks like they
> have found some way to work around this.

I fixed the former with r680. The latter we've implemented a workaround:
the primary slowness that is causing this appears to be the IE alpha
Transparency. Since many layers don't have/need transparency, we've made
the images *not* be returned in an alpha-transparency hack div for the
time being, *unless* a transparent: 'true' param is passed in the WMS
request. (An example diff is in r684.) This is far from a perfect
solution, but seems to make things speedier by default, and we'll keep
this in mind as a performance problem moving forward, one which
hopefully will be helped by #92, "Implement tile image/div reuse"
(although I'm not making any promises yet ;)).

Thanks for calling our attention to these!

-- 
Christopher Schmidt
Web Developer