谷歌地图中的框/矩形绘制选择 [英] Box/Rectangle Draw Selection in Google Maps

问题描述

我正在开发 Google 地图并希望实现一项功能，用户可以使用他/她的鼠标绘制一个框/矩形来选择地图上的一个区域(例如在 Windows 中选择多个文件).选择后，我想获得该区域内的所有标记.我一直在浏览 Google Maps api 和搜索，但找不到解决方案.我尝试使用 jQuery Selectable 进行选择，但它返回的只是一堆 div，我无法确定是否选择了任何标记.

I am working on Google Maps and want to implement a feature where a user can draw a box/rectangle using his/her mouse to select a region on map (like selecting multiple files in windows). Upon selection, I want to get all the markers that fall in the region. I have been looking around both Google Maps api and search but I am unable to find a solution. I tried using jQuery Selectable for selection but all it returns is a bunch of divs from which I am unable to determine if any marker is selected or not.

推荐答案

我找到了一个 Library 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.

I found a Library keydragzoom (http://google-maps-utility-library-v3.googlecode.com/svn/tags/keydragzoom/1.0/docs/reference.html) and used it to draw a rectangle on the page.

后来，我编辑了库并阻止它缩放所选区域，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.图书馆没有给我适当的坐标，我做了以下更改.

Later, I edit the library and stopped it from zooming the selected area and instead made it return the correct co-ordinates in 'dragend' event. Then I manually looped through all the marker on the map to find the markers that are within that particular region. The library was not giving me the proper co-ordinates to I made the following changes.

将 DragZoom 功能更改为

Changed the DragZoom function to

    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

and DragZoom.prototype.onMouseUp_ function to

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);
    }
  };

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