Question

我正在开发Google地图，并希望实现一项功能，用户可以使用鼠标在地图上绘制框/矩形以选择地图上的区域（例如在窗口中选择多个文件）。选择后，我想获得该区域内的所有标记。我一直在寻找Google Maps api和搜索，但我无法找到解决方案。我尝试使用jQuery Selectable进行选择，但它返回的是一堆div，我无法确定是否选择了任何标记。

Answer 1

我找到了一个库keydragzoom（http://google-maps-utility-library-v3.googlecode.com/svn/tags/keydragzoom/1.0/docs/reference.html）并用它在页面上绘制一个矩形。

稍后，我编辑了库并停止了缩放所选区域，而是让它在'dragend'事件中返回正确的坐标。然后我手动循环遍历地图上的所有标记，以找到该特定区域内的标记。图书馆没有给我正确的坐标，我做了以下更改。

将DragZoom功能更改为

    var prj = null;
    function DragZoom(map, opt_zoomOpts) {
        var ov = new google.maps.OverlayView();

        var me = this;
        ov.onAdd = function () {
            me.init_(map, opt_zoomOpts);
        };
        ov.draw = function () {
        };
        ov.onRemove = function () {
        };
        ov.setMap(map);
        this.prjov_ = ov;
        google.maps.event.addListener(map, 'idle', function () {
            prj = ov.getProjection();
        });
    }

和DragZoom.prototype.onMouseUp_函数到

DragZoom.prototype.onMouseUp_ = function (e) {
    this.mouseDown_ = false;
    if (this.dragging_) {
      var left = Math.min(this.startPt_.x, this.endPt_.x);
      var top = Math.min(this.startPt_.y, this.endPt_.y);
      var width = Math.abs(this.startPt_.x - this.endPt_.x);
      var height = Math.abs(this.startPt_.y - this.endPt_.y);
      var points={
        top: top,
        left: left,
        bottom: top + height,
        right: left + width
       };
      var prj = this.prjov_.getProjection();
      // 2009-05-29: since V3 does not have fromContainerPixel, 
      //needs find offset here
      var containerPos = getElementPosition(this.map_.getDiv());
      var mapPanePos = getElementPosition(this.prjov_.getPanes().mapPane);
      left = left + (containerPos.left - mapPanePos.left);
      top = top + (containerPos.top - mapPanePos.top);
      var sw = prj.fromDivPixelToLatLng(new google.maps.Point(left, top + height));
      var ne = prj.fromDivPixelToLatLng(new google.maps.Point(left + width, top));
      var bnds = new google.maps.LatLngBounds(sw, ne);
      //this.map_.fitBounds(bnds); 
      this.dragging_ = false;
      this.boxDiv_.style.display = 'none';
      /**
       * This event is fired when the drag operation ends. 
       * Note that the event is not fired if the hot key is released before the drag operation ends.
       * @name DragZoom#dragend
       * @param {GLatLngBounds} newBounds
       * @event
       */

      google.maps.event.trigger(this, 'dragend', points);
    }
  };

Google地图中的框/矩形绘制选择

1 个答案: