百度地图 获得行政区范围和外接矩形范围

  function getBoundary(name) {
    var bdary = new BMap.Boundary();
        bdary.get(name, function (rs) {       //获取行政区域

            var plys = [];
            map.clearOverlays();        //清除地图覆盖物
            var count = rs.boundaries.length; //行政区域的点有多少个
            for (var i = 0; i < count; i++) {
                var ply = new BMap.Polygon(rs.boundaries[i], { strokeWeight: 2, strokeColor: "#ff0000" }); //建立多边形覆盖物
                map.addOverlay(ply);  //添加覆盖物
                plys.push(ply);
            }
            var pts = plys[0].getPath();
            for(var i=1; i<plys.length; i++)
                pts = pts.concat(plys[i].getPath());
            map.setViewport(pts);    //调整视野

      //获得边界
      var zoom = map.getZoom();
      varplyall = new BMap.Polygon(pts, { strokeWeight: 2, strokeColor: "#ff0000" }); //建立多边形覆盖物

      var swBounds = varplyall.getBounds().getSouthWest();
      var neBounds = varplyall.getBounds().getNorthEast();

      //平面坐标
      var projection =map.getMapType().getProjection();
      var swPt = projection.lngLatToPoint(swBounds);
      var nePt = projection.lngLatToPoint(neBounds);

      window.external.MapInfo2App(zoom,
                                    swPt.x, swPt.y, nePt.x, nePt.y);    
        });
    }