[OpenLayers-Dev] WMS Gutters Shift Tiles -- Possible OL2.12 RC2 Bug

[Eric Lemoine]

On Fri, Apr 27, 2012 at 6:25 PM, Greg Corradini <gregcorradini at gmail.com> wrote:
> Hello,
> I wasn't sure if i should file a 2.12 tagged bug on github for this quite
> yet -- the devs might already be aware of this issue. I'm using 2.12 RC2
> specifically for the IDL drawing.
>
> In 2.12 RC2 adding gutters to WMS overlays shifts my tiles. This seems to
> happen with all possible combinations of the baseLayer and WMS overlay
> wrapDateLine settings -- meaning it happens when baseLayer wrapDateLine =
> false and wmsOverlayLayer wrapDateLine = true etc. There doesn't seem to be
> a threshold where gutter size starts doing this, rather, every gutter pixel
> increment seems to cause shift in WMS tile overlays. In 2.11 release this
> worked fine even when gutters were ridiculously huge > 200 pixels.
>
> Here are some pictures of a WMS layer on a Google baseLayer layer where both
> layers have wrapDateLine = true. Each picture shows a different gutter pixel
> size:
>
> # no gutter
> http://i50.tinypic.com/sc4bxs.png
>
> # 20px gutter
> http://i50.tinypic.com/jgi2j8.png
>
> # 50px gutter
> http://i45.tinypic.com/2edxycl.png
>
> # 100px gutter
> http://i45.tinypic.com/4l357q.png
>
> Are OL devs aware of this? Is there a immediate workaround? Should I file
> this on github with 2.12 tag and if so with what relevant information?

This is a regression. Thanks a lot for reporting the issue. git-bisect
tells me https://github.com/openlayers/openlayers/commit/85498cb23fe87bee23947f0b625082cc23b189ca
is the cause of this regression.



-- 
Eric Lemoine

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