如何计算五个标记之间的距离？

Question

如何计算 Google 地图 V3 中五个标记之间的距离？我知道我必须使用我研究过的 Haversine 公式，甚至在这里找到了一个关于计算两个标记之间距离的帖子。如果我想在五个标记之间计算它怎么办？尝试了几个小时，但计算出的公里数非常错误。谢谢

以下代码如下：

// compute distance between the two points
    var R = 6371; // KM
    var dLat = toRad(location5.lat()-location4.lat()-location3.lat()-location2.lat()-location1.lat());
    var dLon = toRad(location5.lng()-location4.lng()-location3.lng()-location2.lng()-location1.lng()); 

    var dLat1 = toRad(location1.lat());
    var dLat2 = toRad(location2.lat());
    var dLat3 = toRad(location3.lat());
    var dLat4 = toRad(location4.lat());
    var dLat5 = toRad(location5.lat());

    var a = Math.sin(dLat/2) * Math.sin(dLat/2) +
            Math.cos(dLat1) * Math.cos(dLat1) * 
            Math.sin(dLon/2) * Math.sin(dLon/2); 
    var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a)); 
    var d = R * c;

    document.getElementById("distance_direct").innerHTML = "<br/><br/><br/>The distance between the five points (in a straight line) is: "+d +" Km.";
}

function toRad(deg) 
{
    return deg * Math.PI/180;
}

我想我的错误之处在于以 var a 公式开头的行。如果我错了，请指出我的错误，也许有帮助的解决方案？

Answer 1

谷歌地图 V3 中的 computeLength() 函数应该可以满足您的需求，请参阅 http://code.google.com/intl/el/apis/maps/documentation/javascript/geometry.html#Distance

Answer 2

您使用的函数是两个坐标之间的距离。您需要计算从 A->B 到 B->C 的距离，然后将这些距离加起来。

var distAB = calcDist(location1,location2);
var distBC = calcDist(location2,location3);
var distCD = calcDist(location3,location4);
var distDE = calcDist(location4,location5);

var distTotal = distAB + distBC + distCD + distDE;

function calcDist(locationA,locationB)
{
    var R = 6371; // KM
    var dLat = toRad(locationB.lat()) - toRad(locationA.lat());
    var dLng = toRad(locationB.lng()) - toRad(locationA.lng());
    var a = Math.sin(dLat/2) * Math.sin(dLat/2) +
        Math.cos(dLat1) * Math.cos(dLat1) * 
        Math.sin(dLon/2) * Math.sin(dLon/2); 
    var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a)); 
    return R * c;
}

function toRad(deg) 
{
    return deg * Math.PI/180;
}