[OpenLayers-Users] resoloution and tile x and y

[Kenny France]

Hi Guys,
 
Im finally getting somewhere with the help of Chris Adams (Thanks Again)
 
I have a map gererated, that is going to ultimatly grab image tiles from my
server
 
I now know that if my tile is 300 Px and i need a resoloution of 5,12 dd the
calculation is
5.12 / 300 = 0.017066667
 
In my sample i am simply displaying the pink tiles for now, but it is trying
to pull from my url, using the getfile function in the example
 
so it shows get_tile.php?z=1&x=21&y=28
 
where z = zoom
x = tile number in the x position
y = tile number in the y position
 
No by knowing the zoom level tile number etc, how could i calculate the
center lat/lng of the tile needed?
I thought it would be simple but how will i figure out if the lat/lng are
negitive values
 
Please help me once again
 
K-

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