2012-12-13 123 views
0

我正在使用Google地图切换到leaflet.js。我在Google地图中做过的一件事,似乎无法在leaflet.js中找到,它计算从地图中心(即搜索位置)到地图边上的半径。因为您可以放大或缩小人们正在看的区域可能会发生显着变化。 下面的代码显示了我为了用google地图做的那几行。有人可以指出我关于leaflet.js的正确方向吗?leaflet.js计算从中心到边界的半径

// viewport stores the recommended viewport for the returned result. 
    // (LatLngBounds) 
    viewportLatLngBounds = zip.get("location").geometry.viewport; 

    this.map.fitBounds(viewportLatLngBounds); 

    this.collection.latitude = viewportLatLngBounds.getCenter().lat(); 
    this.collection.longitude = viewportLatLngBounds.getCenter().lng(); 

    // calculate radius 
    // get distance.. 
    // from (lat of NE corner), (lng of center) 
    // to (lat of center), (lng of center) 
    topCenterLatLng = new google.maps.LatLng(viewportLatLngBounds.getNorthEast().lat(), viewportLatLngBounds.getCenter().lng()); 

    metersRadius = google.maps.geometry.spherical.computeDistanceBetween(viewportLatLngBounds.getCenter(), topCenterLatLng); 

    this.collection.radius = metersRadius/1000; 
    this.collection.radiusUnits = "km"; 

回答

6

以供将来参考:

getMapRadiusKM: function() { 
    var mapBoundNorthEast = map.getBounds().getNorthEast(); 
    var mapDistance = mapBoundNorthEast.distanceTo(map.getCenter()); 
    return mapDistance/1000; 
},