我在计算地图上几个点之间的距离时遇到了困难:
我有一组坐标,其中第一个坐标 ["30.327547", "59.919676"] 是旅行的开始,其他的是进站:
var J = [
["30.327547", "59.919676"],
["29.84964", "58.737619"],
["28.250252", "57.785994"],
["30.098912", "55.175885"],
["30.37357", "54.503783"],
["27.572056", "53.898325"],
["26.000193", "53.11856"]
];
接下来,要从这个坐标制作地图上的地理点,我应该使用特殊的 Yandex Maps API 函数 YMaps.Geopoint:
var a=new YMaps.GeoPoint(30.327547,59.919676);
var b=new YMaps.GeoPoint(29.84964,58.737619);
var c=new YMaps.GeoPoint(28.250252,57.785994);
var d=new YMaps.GeoPoint(30.098912,55.175885);
var e=new YMaps.GeoPoint(30.37357,54.503783);
var f=new YMaps.GeoPoint(27.572056,53.898325);
var g=new YMaps.GeoPoint(26.000193,53.11856);
最后,为了计算点之间的距离,我使用了另一个 API 函数“point1.distance(point2)”:
var d1=a.distance(b); //distance1
var d2=a.distance(b)+b.distance(c); //distance2
var d3=a.distance(b)+b.distance(c)+c.distance(d); //distance3
var d4=a.distance(b)+b.distance(c)+c.distance(d)+d.distance(e); //distance4
var d5=a.distance(b)+b.distance(c)+c.distance(d)+d.distance(e)+e.distance(f); //distance5
var d6=a.distance(b)+b.distance(c)+c.distance(d)+d.distance(e)+e.distance(f)+f.distance(g); //distance6
这很好用(我还将每个结果转换为格式 (result km) ),结果是:
console.log(YMaps.humanDistance(d1));console.log(YMaps.humanDistance(d2));console.log(YMaps.humanDistance(d3));
console.log(YMaps.humanDistance(d4));console.log(YMaps.humanDistance(d5));console.log(YMaps.humanDistance(d6));
//{"Point1":"134 km.","Point2":"275 km.","Point3":"586 km.","Point4":"663 km.","Point5":"857 km.","Point6":"992 km."}
我实际上想在循环中进行此操作:
for(var i=0;i<J.length;i++){
// Iteratting through the array of points of J and creating Geoobjects on the map, dynamically putting them into public variables "temp_*"
window["temp_" + i]=new YMaps.GeoPoint(J[i][0],J[i][1]);
//next point
var next=i+1;
//master point (the begin of trip)
var master=window["temp_0"];
//calculating the distance between the master point and actual [i] point in the loop
var formula=master.distance(window["temp_"+i]);
// calculating the distance between the actual [i] point and the next in the loop
var formula2=window["temp_" + i].distance(window["temp_"+next]);
//summing and converting into human format and dinamically putting them into variables "result_*"
window["result_"+i]=YMaps.humanDistance(formula+formula2);
//logging the results
console.log(YMaps.humanDistance(window["result_"+i]));
}
此循环有效,但返回错误结果。有人可以建议循环中有什么问题吗?我想可能我需要在这个循环中使用另一个循环,它将根据需要(需要)多次返回其他点的总和。谢谢。