如何获得当前地图的当前面积,宽度和高度(相对于纬度和经度)？

Question

假设我有一个div宽度x和高度都y在t缩放级别的地图.如何找到当前可见地图的面积,宽度和高度？

Answer 1

这是答案,

var spherical = google.maps.geometry.spherical, 
    bounds = map.getBounds(), 
    cor1 = bounds.getNorthEast(), 
    cor2 = bounds.getSouthWest(), 
    cor3 = new google.maps.LatLng(cor2.lat(), cor1.lng()), 
    cor4 = new google.maps.LatLng(cor1.lat(), cor2.lng()), 
    width = spherical.computeDistanceBetween(cor1,cor3), 
    height = spherical.computeDistanceBetween( cor1, cor4);