openLayers加载高德地图

之前用openlayers对高德，百度，腾讯，bing,supermap,天地图，arcgis,google等地图进行了对接，今天简单介绍一下openlayers+高德:

在Openlayers.Layer.XYZ.js中有如下更改：（百度兴趣点下载工具：http://www.cnblogs.com/songjiang6940/p/baiduPOI.html）

      * bounds - {<OpenLayers.Bounds>}
      *
      * Returns:
      * {String} A string with the layer's url and parameters and also the
      *          passed-in bounds and appropriate tile size specified as
      *          parameters
      */
     getURL: function (bounds) {
         var xyz = this.getXYZ(bounds);
         var url = this.url;
         if (OpenLayers.Util.isArray(url)) {
             var s = '' + xyz.x + xyz.y + xyz.z;
             url = this.selectUrl(s, url);
         }

         return OpenLayers.String.format(url, xyz);
     },

     /**
      * Method: getXYZ
      * Calculates x, y and z for the given bounds.
      *
      * Parameters:
      * bounds - {<OpenLayers.Bounds>}
      *
      * Returns:
      * {Object} - an object with x, y and z properties.
      */
     getXYZ: function(bounds) {
         var res = this.getServerResolution();
         var x = Math.round((bounds.left - this.maxExtent.left) /
             (res * this.tileSize.w));
         var y = Math.round((this.maxExtent.top - bounds.top) /
             (res * this.tileSize.h));
         var z = this.getServerZoom();

         if (this.wrapDateLine) {
             var limit = Math.pow(2, z);
             x = ((x % limit) + limit) % limit;
         }

         return {'x': x, 'y': y, 'z': z};
     },