适合多个多边形 google 地图的边界

Fit Bounds for Multiple Polygons google Maps

我正在尝试扩展多个多边形的地图边界,但它似乎只扩展了循环中最后一个多边形的边界。关于我哪里出错的任何建议?

 function FitBounds(){
    for (var i=0; i < shapes2.length; i++){
        var paths = shapes2[i].getPaths();
        var bounds= new google.maps.LatLngBounds();
        paths.forEach(function(path){
           var ar = path.getArray();
           for(var i=0, l = ar.length; i <l; i++){
              bounds.extend(ar[i]);
           }
        })
    }
    map.fitBounds(bounds)
 }

在循环外创建边界。

function FitBounds(){
    var bounds= new google.maps.LatLngBounds();
    for (var i=0; i < shapes2.length; i++){
        var paths = shapes2[i].getPaths();
        paths.forEach(function(path){
           var ar = path.getArray();
           for(var i=0, l = ar.length; i <l; i++){
              bounds.extend(ar[i]);
           }
        })
    }
    map.fitBounds(bounds)
 }

仅供其他人参考,google 地图库提供了辅助方法,可以更轻松地获取形状集合的边界:

function FitBounds(){
    var bounds = shapes2.reduce((boundsAccumulator, shape) => 
      boundsAccumulator.union(shape.getBounds()), new google.maps.LatLngBounds())
    
    map.fitBounds(bounds)
 }

或者如果您不喜欢 reduce

function FitBounds(){
    var bounds = new google.maps.LatLngBounds()
    
    shapes2.forEach(shape) => bounds.union(shape.getBounds()))
    
    map.fitBounds(bounds)
 }