百度地图API 拖拽或点击地图位置获取坐标

时间：2023-03-08 23:13:59
百度地图API 拖拽或点击地图位置获取坐标 
     function setPlace(map,myValue,callback){

       function getAddress(){

         var pp = local.getResults().getPoi(0).point;    //获取第一个智能搜索的结果

         map.centerAndZoom(pp, 18);

         var marker = new BMap.Marker(pp);// 创建标注

         map.addOverlay(marker);             // 将标注添加到地图中

         marker.enableDragging();     // 可拖拽

         marker.addEventListener('dragend', function (e) {//拖动标注结束

           var pointNew = e.point;

           console.log("使用拖拽获取的百度坐标"+pointNew.lng+","+pointNew.lat);

           marker.setPosition(pointNew);//设置覆盖物位置

           //百度转GCJ-02

           var x_pi = 3.14159265358979324 * 3000.0 / 180.0;

           var x = pointNew.lng - 0.0065;

           var y = pointNew.lat - 0.006;

           var z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * x_pi);

           var theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * x_pi);

           var gg_lng = z * Math.cos(theta);

           var gg_lat = z * Math.sin(theta);

           //百度GCJ02转web墨卡托84

           var earthRad = 6378137.0;

           pointNew.lng = gg_lng * Math.PI / 180 * earthRad;

           var a = gg_lat * Math.PI / 180;

           pointNew.lat = earthRad / 2 * Math.log((1.0 + Math.sin(a)) / (1.0 - Math.sin(a)));

           console.log("使用拖拽获取的百度坐标转换的WebMercator坐标是（"+pointNew.lng+","+pointNew.lat+")");

           return callback(pointNew);

         });

         map.addEventListener("click", function(e){

           console.log('换位置百度的经度:'+e.point.lng+' , 纬度: '+e.point.lat);

           var now_point =  new BMap.Point(e.point.lng, e.point.lat );

           marker.setPosition(now_point);//设置覆盖物位置

           var x_pi = 3.14159265358979324 * 3000.0 / 180.0;

           var x = now_point.lng - 0.0065;

           var y = now_point.lat - 0.006;

           var z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * x_pi);

           var theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * x_pi);

           var gg_lng = z * Math.cos(theta);

           var gg_lat = z * Math.sin(theta);

           //GCJ02转web墨卡托84

           var earthRad = 6378137.0;

           now_point.lng = gg_lng * Math.PI / 180 * earthRad;

           var a = gg_lat * Math.PI / 180;

           now_point.lat = earthRad / 2 * Math.log((1.0 + Math.sin(a)) / (1.0 - Math.sin(a)));

           console.log("WebMercator坐标是（"+now_point.lng+","+now_point.lat+")");

           return callback(now_point);

         });

         //百度转墨卡托

         console.log("使用点击换位置获取的百度坐标百度地图坐标是（"+pp.lng+","+pp.lat+")");

         //百度转GCJ-02

         var x_pi = 3.14159265358979324 * 3000.0 / 180.0;

         var x = pp.lng - 0.0065;

         var y = pp.lat - 0.006;

         var z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * x_pi);

         var theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * x_pi);

         var gg_lng = z * Math.cos(theta);

         var gg_lat = z * Math.sin(theta);

         //GCJ02转web墨卡托84

         var earthRad = 6378137.0;

         pp.lng = gg_lng * Math.PI / 180 * earthRad;

         var a = gg_lat * Math.PI / 180;

         pp.lat = earthRad / 2 * Math.log((1.0 + Math.sin(a)) / (1.0 - Math.sin(a)));

         console.log("使用点击换位置获取的百度坐标转换后的WebMercator坐标是（"+pp.lng+","+pp.lat+")");

         return callback(pp);

       }

       var local = new BMap.LocalSearch(map, { onSearchComplete: getAddress});

       local.search(myValue);

     }

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