On 01/08/2009, S.Choe <[email protected]> wrote:
>
> Dear All.
>
> I used custom tile method to draw tile overlay covering some area.
>
> My program
> GTileLayer g;
> g.getTileUrl() is defined by a separate php code with tile.x, tile.y,
> zoom level.
>
> In defining getTileUrl(), I generate image with (x,y,zoom). But it
> took to much time.
>
> I would like to generate the image before user's view frustum visit
> the area.
> That is to say, I would like to implement function:
> For given area [minx, miny, maxx, maxy],
> generateTile([minx, miny, maxx, maxy], [minzoom, maxzoom]) will
> returns
> array of tile images which covers all the area and for given interval
> of zooms.
woulding it just be
function generateTile(minx, miny, maxx, maxy, minzoom, maxzoom) {
list = array();
foreach x (minx..maxx) {
foreach y (miny..maxy) {
foreach z (minzoom..maxzoom) {
list[] = array(x,y,z);
}
}
}
return list;
}
>
> For any given area and zoom, how do i compute grid of tiles (tile.x,
> tile.y)?
>
> Thank you.
>
> SK.
>
> >
>
--
Barry
- www.nearby.org.uk - www.geograph.org.uk -
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