如何动态添加KML坐标点和计算速度

[道吾青尘]

文件结构我已经能生成出来 也可用了 具体代码该怎么写

[道吾青尘]

//插入数据
string path = @"E:\niu.kml";
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(path);
XmlNode xn = xmlDoc.SelectSingleNode("kml/Document");

XmlElement pl = xmlDoc.CreateElement("Placemark");
xn.AppendChild(pl);

XmlElement des = xmlDoc.CreateElement("description");
des.InnerText = "Time:" + System.DateTime.Now.ToString() + " Coord:" + xx.ToString() + "," + yy.ToString() + " Speed:" + "23km/h";//设置节点文本
pl.AppendChild(des);//添加到<Placemark>节点中

XmlElement poi = xmlDoc.CreateElement("Point");
pl.AppendChild(poi);

XmlElement coor = xmlDoc.CreateElement("coordinates");
coor.InnerText = xx.ToString() + "," + yy.ToString() + " ";
poi.AppendChild(coor);

xmlDoc.Save(path);
xx += 0.003;
yy += 0.002;

汗 都没人来帮忙
自己找到了 谁来回个帖 分还有人要不咯