1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
MM.TileCacheMapProvider = function(template, subdomains) {
// utility functions...
function addZeros(i, zeros) {
if (zeros === undefined) {
zeros = 3;
}
var s = i.toString();
while (s.length < zeros)
{
s = '0' + s;
}
return s;
}
function tilePad(i) {
return addZeros(parseInt(i / 1000000, 10)) + '/' +
addZeros(parseInt(i / 1000, 10)) + '/' + addZeros(i % 1000);
}
// this is like a call to 'super', kinda...
// we end up initializing a basic modestmaps.js MapProvider with
// a getTileURL function that knows about the above utility functions
MM.MapProvider.call(this, function(coord) {
coord = this.sourceCoordinate(coord);
if (!coord) {
return null;
}
var mod = coord.copy();
// fill in coordinates into URL
var url = template.replace('{Z}', mod.zoom)
.replace('{X}', tilePad(mod.column))
.replace('{Y}', tilePad(Math.pow(2, mod.zoom) - 1 - mod.row));
// replace the {S} portion of the url with the appropriate subdomain
if (url.indexOf('{S}') > -1) {
var subdomain = (subdomains && subdomains.length > 0) ?
subdomains[parseInt(mod.row + mod.column, 10) % subdomains.length] : '';
url = url.replace('{S}', subdomain ? subdomain + '.' : '');
}
return url;
});
};
MM.extend(MM.TileCacheMapProvider, MM.MapProvider);
|
