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// namespacing!
if (!MM) {
MM = { };
}
MM.BingProvider = function(key, style, onready) {
this.key = key;
this.style = style;
// hit the imagery metadata service
// http://msdn.microsoft.com/en-us/library/ff701716.aspx
// Aerial, AerialWithLabels, Road
var script = document.createElement('script');
script.type = 'text/javascript';
document.getElementsByTagName('head')[0].appendChild(script);
script.src = 'http://dev.virtualearth.net/REST/V1/Imagery/Metadata/'+style+'/?key='+key+'&jsonp=onBingComplete';
function toMicrosoft(column, row, zoom) {
// generate zoom string by interleaving row/col bits
// NB:- this assumes you're only asking for positive row/cols
var quadKey = "";
for (var i = 1; i <= zoom; i++) {
var rowBit = (row >> zoom-i) & 1;
var colBit = (column >> zoom-i) & 1;
quadKey += (rowBit << 1) + colBit;
}
return quadKey;
}
var provider = this;
window.onBingComplete = function(data) {
var resourceSets = data.resourceSets;
for (var i = 0; i < resourceSets.length; i++) {
var resources = data.resourceSets[i].resources;
for (var j = 0; j < resources.length; j++) {
var resource = resources[j];
var serverSalt = Math.floor(Math.random() * 4);
provider.getTile = function(coord) {
var quadKey = toMicrosoft(coord.column, coord.row, coord.zoom);
// this is so that requests will be consistent in this session, rather than totally random
var server = Math.abs(serverSalt + coord.column + coord.row + coord.zoom) % 4;
return resource.imageUrl
.replace('{quadkey}',quadKey)
.replace('{subdomain}', resource.imageUrlSubdomains[server]);
};
// TODO: use resource.imageWidth
// TODO: use resource.imageHeight
}
}
// TODO: display data.brandLogoUri
// TODO: display data.copyright
onready(provider);
};
};
MM.BingProvider.prototype = {
key: null,
style: null,
subdomains: null,
getTileUrl: null
};
MM.extend(MM.BingProvider, MM.MapProvider);
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