Google Maps v3 - Radio del mapa visible en millas

Question

¿Cómo puedo encontrar la proximidad del área visible de mi mapa?

Todo esto funciona y es una publicación para ayudar a otros que puedan estar buscando.

Este código mira su Google Map v3 y muestra por var proximidad el radio en millas de su vista de mapa actual.

Asegúrese de que en el código HTML que tiene

<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=true&libraries=geometry"></script> 

como bibliotecas = geometría habilita.

// Get Gmap radius/proximity start 
var bounds = new google.maps.LatLngBounds(); 
var sw = bounds.getSouthWest(); 
var ne = bounds.getNorthEast(); 

var proximitymeter = google.maps.geometry.spherical.computeDistanceBetween (sw, ne); 
var proximitymiles = proximitymeter * 0.000621371192; 
alert(" " + proximitymiles + " Miles Proximity"); 
var proxmity = proximitymiles; 
// Get Gmap radius/proximity End 

Espero que ayude a alguien.

Una edición adicional (no probado) que permite la rotación de la pantalla sigue:

// Get Gmap radius/proximity start 
var bounds = new google.maps.LatLngBounds(); 
var sw = bounds.getSouthWest(); 
var ne = bounds.getNorthEast(); 
var se = bounds.getSouthEast(); 
var nw = bounds.getNorthWest(); 

var proximitymeterswne = google.maps.geometry.spherical.computeDistanceBetween (sw, ne); 
var proximitymetersenw = google.maps.geometry.spherical.computeDistanceBetween (se, nw); 

if (proximitymeterswne > proximitymetersenw) {proximitymeterswne = proximitymiles} 
else {if (proximitymetersenw > proximitymeterswne) {proximitymetersenw = proximitymiles};}; 

var proximitymiles = proximitymeter * 0.000621371192; 
alert(" " + proximitymiles + " Miles Proximity"); 
var proxmity = proximitymiles; 
// Get Gmap radius/proximity End 

Otra EDITAR

// Watches for map bounds change - if so - set radius and refresh data Start 
function setproximityfrommap() { 
    // http://stackoverflow.com/questions/3525670/radius-of-viewable-region-in-google-maps-v3 
    // Get Gmap radius/proximity start 
    var bounds = new google.maps.LatLngBounds(); 
    // bounds = map.LatLngBounds(); 
    //center = new google.maps.LatLng(); 

    ne = bounds.getNorthEast();  
    center = map.getCenter(); 

    //var center = map.LatLngBounds.getCenter(); 
    //var ne = map.LatLngBounds.getNorthEast(); 

    // r = radius of the earth in statute miles 
    var r = 3963.0; 

    // Convert lat or lng from decimal degrees into radians (divide by 57.2958) 
    var lat1 = center.lat()/57.2958; 
    var lon1 = center.lng()/57.2958; 
    var lat2 = ne.lat()/57.2958; 
    var lon2 = ne.lng()/57.2958; 

    // distance = circle radius from center to Northeast corner of bounds 
    proximity = r * Math.acos(Math.sin(lat1) * Math.sin(lat2) + Math.cos(lat1) * Math.cos(lat2) * Math.cos(lon2 - lon1)); 
    $('#proximity').val(proximity); 
    // Get Gmap radius/proximity End 
}; 

---

pongo el código editado en el primer mensaje.

Terran

Answer 1

// Watches for map bounds change - if so - set radius and refresh data Start 
function setproximityfrommap() { 
    // http://stackoverflow.com/questions/3525670/radius-of-viewable-region-in-google-maps-v3 
    // Get Gmap radius/proximity start 
    // First, determine the map bounds 
    var bounds = map.getBounds(); 

    // Then the points 
    var swPoint = bounds.getSouthWest(); 
    var nePoint = bounds.getNorthEast(); 

    // Now, each individual coordinate 
    var swLat = swPoint.lat(); 
    var swLng = swPoint.lng(); 
    var neLat = nePoint.lat(); 
    var neLng = nePoint.lng(); 

    var proximitymeter = google.maps.geometry.spherical.computeDistanceBetween(swPoint, nePoint); 
    var proximitymiles = proximitymeter * 0.000621371192; 
    proxmity = proximitymiles; 
    console.log("Proxmity " + proximitymiles + " miles"); 
}