如何计算折线距离？

Question

function createLine()
{

geocoder = new google.maps.Geocoder();
var latlng = new google.maps.LatLng(7.5653, 80.4303);
var mapOptions = {
    zoom: 8,
    center: latlng,
    mapTypeId: google.maps.MapTypeId.ROADMAP
}
map = new google.maps.Map(document.getElementById("directionpanel"), mapOptions);

var address = document.getElementById('startvalue').value;
var address2 = document.getElementById('endvalue').value;

var temp, temp2;

geocoder.geocode({ 'address': address }, function (results, status) {
    temp = results[0].geometry.location;
    geocoder.geocode({ 'address': address2 }, function (results, status) {
        temp2 = results[0].geometry.location;

    var route = [
      temp,
      temp2
    ];

    var polyline = new google.maps.Polyline({
        path: route,
        strokeColor: "#ff0000",
        strokeOpacity: 0.6,
        strokeWeight: 5
    });

    polyline.setMap(map);
    });
});
}

这段代码很好用.我想计算我创建的线的距离.我希望通过警报以米为单位显示此值.请帮助我......(在这种情况下,两个点直接与线路连接.我想计算直线距离.)

Answer 1

使用google.maps.geometry.spherical.computeLength(确保包含几何库)

function createLine()
{

geocoder = new google.maps.Geocoder();
var latlng = new google.maps.LatLng(7.5653, 80.4303);
var mapOptions = {
    zoom: 8,
    center: latlng,
    mapTypeId: google.maps.MapTypeId.ROADMAP
}
map = new google.maps.Map(document.getElementById("directionpanel"), mapOptions);

var address = document.getElementById('startvalue').value;
var address2 = document.getElementById('endvalue').value;

var temp, temp2;

geocoder.geocode({ 'address': address }, function (results, status) {
    temp = results[0].geometry.location;
    geocoder.geocode({ 'address': address2 }, function (results, status) {
        temp2 = results[0].geometry.location;

    var route = [
      temp,
      temp2
    ];

    var polyline = new google.maps.Polyline({
        path: route,
        strokeColor: "#ff0000",
        strokeOpacity: 0.6,
        strokeWeight: 5
    });

    var lengthInMeters = google.maps.geometry.spherical.computeLength(polyline.getPath());
    alert("polyline is "+lengthInMeters+" long");

    polyline.setMap(map);
    });
});
}

工作示例(更新了上一个问题中的示例以包括长度计算)