百度地图 判断marker是否在多边形内

                                 // 画可编辑矩形
                         var mPoint=new BMap.Point(e.lng,e.lat);// 得到中心点坐标
                          var pStart = new BMap.Point(e.lng,e.lat);
                          var pEnd = new BMap.Point((e.lng+0.1),(e.lat+0.1));
                          var polygon = new BMap.Polygon([
                              new BMap.Point(pStart.lng,pStart.lat),
                              new BMap.Point(pEnd.lng,pStart.lat),
                              new BMap.Point(pEnd.lng,pEnd.lat),
                              new BMap.Point(pStart.lng,pEnd.lat)
                              ], {strokeColor:"blue", strokeWeight:1, strokeOpacity:0.5});
                          map.addOverlay(polygon);
                          polygon.enableEditing();

 for(var i=0;i<overlays.length;i++){
                              //判断 覆盖物为标注的并且是在圆形区域内部的
                              if(overlays[i].uQ == "Marker"){
                                  //判断marker是否在多边形内
                                    if(BMapLib.GeoUtils.isPointInPolygon(overlays[i].getPosition(), polygon)){
                                       maker_arr.push(overlays[i]);                                   
                                       maker_id.push(overlays[i].id);                                      
                                  }                                    
                              }
                            }