src/imagetilesource.js
function (level, x, y) {
            var url = null;
            if (level >= this.minLevel && level <= this.maxLevel) {
                url = this.levels[level].url;
            }
            return url;
        }
function (level, x, y) {
            var url = null;
            if (level >= this.minLevel && level <= this.maxLevel) {
                url = this.levels[level].url;
            }
            return url;
        }
function ( level , x , y ) { var url = null ; if ( level >= this . minLevel && level <= this . maxLevel ) { url = this . levels [ level ] . url ; } return url ; }
Retrieves a tile url
@function
@param {Number} level Level of the tile
@param {Number} x x coordinate of the tile
@param {Number} y y coordinate of the tile
Retrieves a tile url