[OpenLayers-Users] how-to calculate resolutions for custom tiles

[Greg Donald]

On Tue, Dec 9, 2008 at 1:48 PM, Christopher Schmidt
<crschmidt at metacarta.com> wrote:
>>     //resolutions: [ 2048, 1024, 512, 256, 128, 64, 32, 16, 8, 4, 2, 1 ],
>>     //resolutions: [ 256, 128, 64, 32, 16, 8, 4, 2, 1, 0.5, 0.25 ],
>>     //resolutions: [ 1, 0.5, 0.25, 0.125, 0.0625, 0.03125, 0.015625,
>> 0.0078125, 0.00390625, 0.001953125, 0.0009765625 ],

It does work really well, but something is still not quite right,
maybe it's other settings.

> I'd expect this last one to work. You could also simply set
> "maxResolution": 1, and it would calculate the rest on its own. What
> aspect of that isn't working for you?

On the top row, on some resolutions, I get calls for images with
negative coordinates.  I'm not sure why that's happening since I'm
using

maxExtent: new OpenLayers.Bounds( 0, 0, 1667867, 403 )

and all my bounds are positive.  I can't provide a (0, -1) image since
non exist.


Another issue is that when I use

restrictedExtent: new OpenLayers.Bounds( 0, 0, 1667867, 403 )

some of the top row tiles are hidden from view, I cannot even drag to see it.

But if I don't set restrictedExtent: to something I get an ugly black
border around my entire map.



Thanks,


-- 
Greg Donald
http://destiney.com/