每x Km方向添加里程碑（标记） [英] Add milestones (markers) every x Km on direction

问题描述

我想在谷歌地图API给出的方向的多段线上每5或10公里添加一个标记。
是这样的：

http： //www.geocodezip.com/v3_polyline_example_kmmarkers_0.html

但是用google的方向

解决方案

我发现了一个像魅力一样的公式。它每隔8米就会在给定点之间添加一个标记。

我从这里得到公式：如何计算两个给定点和给定距离之间的点？

PointF pointA，pointB;

  var diff_X = pointB.X  -  pointA.X; 
 var diff_Y = pointB.Y  -  pointA.Y; 
 int pointNum = 8; 
 
 var interval_X = diff_X /（pointNum + 1）; 
 var interval_Y = diff_Y /（pointNum + 1）; 
 
列表< PointF> pointList = new List< PointF>（）; 
 for（int i = 1; i <= pointNum; i ++）
 {
 pointList.Add（new PointF（pointA.X + interval_X * i，pointA.Y + interval_Y * i ））; 
} 
  

Android
我的最终结果翻译

  // GeoPoint PointF，pointA，pointB; 
 
 Double diff_X = lat2  -  lat1; 
 Double diff_Y = lon2  -  lon1; 
 int pointNum = 8; 
 
 Double interval_X = diff_X /（pointNum + 1）; 
 Double interval_Y = diff_Y /（pointNum + 1）; 
 
 // ArrayList< GeoPoint> geoPoints = new ArrayList<>（）; 
列表< GeoPoint> pointList = new ArrayList<>（）; 
 for（int i = 1; i <= pointNum; i ++）
 {
 GeoPoint g = new GeoPoint（lat1 + interval_X * i，lon1 + interval_Y * i）; 
 pointList.add（g）; 
 itemizedLayer.addItem（createMarkerItem（g，R.drawable.ic_my_location））; 
} 
 
 
 map.map（）。updateMap（true）; 
  

I want to add a marker every 5 or 10 Kilometer on the polylines of the direction given by google maps api. something like this :

http://www.geocodezip.com/v3_polyline_example_kmmarkers_0.html

but with the google direction's

解决方案

I found a formula that works like a charm. It adds a marker every 8 meter between to given points.

I got the formula from here: How to calculate the points between two given points and given distance?

PointF pointA, pointB;

    var diff_X = pointB.X - pointA.X;
    var diff_Y = pointB.Y - pointA.Y;
    int pointNum = 8;

    var interval_X = diff_X / (pointNum + 1);
    var interval_Y = diff_Y / (pointNum + 1);

    List<PointF> pointList = new List<PointF>();
    for (int i = 1; i <= pointNum; i++)
    {
        pointList.Add(new PointF(pointA.X + interval_X * i, pointA.Y + interval_Y*i));
    }

Android My end result translation

    //GeoPoint PointF, pointA, pointB;

    Double diff_X = lat2 - lat1;
    Double diff_Y = lon2 - lon1;
    int pointNum = 8;

    Double interval_X = diff_X / (pointNum + 1);
    Double interval_Y = diff_Y / (pointNum + 1);

    //ArrayList<GeoPoint> geoPoints = new ArrayList<>();
    List<GeoPoint> pointList = new ArrayList<>();
    for (int i = 1; i <= pointNum; i++)
    {
        GeoPoint g = new GeoPoint(lat1 + interval_X * i, lon1 + interval_Y*i);
        pointList.add(g);
        itemizedLayer.addItem(createMarkerItem(g, R.drawable.ic_my_location));
    }


    map.map().updateMap(true);

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