百度地图API 拖拽或点击地图位置获取坐标

 1     function setPlace(map,myValue,callback){
 2       function getAddress(){
 3         var pp = local.getResults().getPoi(0).point;    //获取第一个智能搜索的结果
 4         map.centerAndZoom(pp, 18);
 5         var marker = new BMap.Marker(pp);// 创建标注
 6         map.addOverlay(marker);             // 将标注添加到地图中
 7         marker.enableDragging();     // 可拖拽
 8 
 9 
10         marker.addEventListener('dragend', function (e) {//拖动标注结束
11           var pointNew = e.point;
12           console.log("使用拖拽获取的百度坐标"+pointNew.lng+","+pointNew.lat);
13           marker.setPosition(pointNew);//设置覆盖物位置
14           //百度转GCJ-02
15           var x_pi = 3.14159265358979324 * 3000.0 / 180.0;
16           var x = pointNew.lng - 0.0065;
17           var y = pointNew.lat - 0.006;
18           var z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * x_pi);
19           var theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * x_pi);
20           var gg_lng = z * Math.cos(theta);
21           var gg_lat = z * Math.sin(theta);
22           //百度GCJ02转web墨卡托84
23           var earthRad = 6378137.0;
24           pointNew.lng = gg_lng * Math.PI / 180 * earthRad;
25           var a = gg_lat * Math.PI / 180;
26           pointNew.lat = earthRad / 2 * Math.log((1.0 + Math.sin(a)) / (1.0 - Math.sin(a)));
27           console.log("使用拖拽获取的百度坐标转换的WebMercator坐标是（"+pointNew.lng+","+pointNew.lat+")");
28           return callback(pointNew);
29         });
30 
31 
32         map.addEventListener("click", function(e){
33           console.log('换位置百度的经度:'+e.point.lng+' , 纬度: '+e.point.lat);
34           var now_point =  new BMap.Point(e.point.lng, e.point.lat );
35           marker.setPosition(now_point);//设置覆盖物位置
36           var x_pi = 3.14159265358979324 * 3000.0 / 180.0;
37           var x = now_point.lng - 0.0065;
38           var y = now_point.lat - 0.006;
39           var z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * x_pi);
40           var theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * x_pi);
41           var gg_lng = z * Math.cos(theta);
42           var gg_lat = z * Math.sin(theta);
43           //GCJ02转web墨卡托84
44           var earthRad = 6378137.0;
45           now_point.lng = gg_lng * Math.PI / 180 * earthRad;
46           var a = gg_lat * Math.PI / 180;
47           now_point.lat = earthRad / 2 * Math.log((1.0 + Math.sin(a)) / (1.0 - Math.sin(a)));
48           console.log("WebMercator坐标是（"+now_point.lng+","+now_point.lat+")");
49           return callback(now_point);
50         });
51         //百度转墨卡托
52         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+")");
53         //百度转GCJ-02
54         var x_pi = 3.14159265358979324 * 3000.0 / 180.0;
55         var x = pp.lng - 0.0065;
56         var y = pp.lat - 0.006;
57         var z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * x_pi);
58         var theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * x_pi);
59         var gg_lng = z * Math.cos(theta);
60         var gg_lat = z * Math.sin(theta);
61         //GCJ02转web墨卡托84
62         var earthRad = 6378137.0;
63         pp.lng = gg_lng * Math.PI / 180 * earthRad;
64         var a = gg_lat * Math.PI / 180;
65         pp.lat = earthRad / 2 * Math.log((1.0 + Math.sin(a)) / (1.0 - Math.sin(a)));
66         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+")");
67         return callback(pp);
68       }
69 
70       var local = new BMap.LocalSearch(map, { onSearchComplete: getAddress});
71       local.search(myValue);
72     }