[OpenLayers-Users] Maximum extent shrinks when zooming in
zenzero-2001
John.Westwood at port.ac.uk
Tue Apr 15 18:39:17 EDT 2008
Hi Christopher,
Thank you for your swift reply. You are probably right that it is not a bug,
I will have to do some further investigation and report back. I have a bit
of deadline at work at the moment, so it will have to wait.
Actually I never said that changing maxResolution solved the problem. In my
first post, I said changing it to 'auto' did not solve the problem. Using
the restrictedExtent keyword, however, has 'solved' the problem :)
Best Regards,
John Westwood (zenzero-2001)
Christopher Schmidt-4 wrote:
>
> On Tue, Apr 15, 2008 at 03:00:28PM -0700, zenzero-2001 wrote:
>>
>> Hi Christopher,
>>
>> That's interesting that's it's not considered a bug. Personally, I would
>> definitely think of it as a bug or possibly an undocumented feature :) I
>> hope you don't think that I was complaining, I think that OpenLayers is
>> great.
>
> Well, if you think there's a bug, you need to do further description of
> the issue to convince me, is all. What you have described so far sounds
> to me to be not a bug. What you have described so far sounds to me like:
>
> * I have a map, from (for example) -10, -3, 10, 3
> * I set a maxResolution of 6 / 256, so that my whole world fits
> vertically within one 256 px tile
> * Because my map is 20 units wide, it is 4 tiles wide, and therefore
> covers more than -10 -> 10 in the longitude direction: 24 degrees.
> * When I zoom in, my resolution drops to 6/512:
> * Vertically, the world is two tiles.
> * Horizontally, it is 7 tiles -- taking up less horizontal
> geographic space than before: 21 degrees.
>
> Since you've said you can change your maxResolution, and it 'solves' the
> problem, I assume that you've found that if you pick a maxResolution
> that divides *evenly* into the width *and* height (in this case,
> something like '2' would do: 3 tiles high, 10 tiles wide), you will see
> that the tiles match your geographic space correctly.
>
> If this is *not* what you're describing, then you'll need to be more
> clear, because this behavior isn't a bug: in fact, I don't know of any
> way around it.
>
> Regards,
> --
> Christopher Schmidt
> MetaCarta
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>
>
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