用C#动态刷新KML

用C#动态刷新KML

 首先新建一个项目，添加一个timer控件和按钮，当点击按钮时，会动态更新dynamic.kml中的内容，使点的经纬度坐标实时变化。代码如下：

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private double xx=100;    private double yy=30;    private void timer1_Tick(object sender, EventArgs e)    {                xx +=0.03;                yy +=0.03;                                  FileStream fs = new FileStream("products.kml", FileMode.Create);                XmlTextWriter w = new XmlTextWriter(fs, Encoding.UTF8);                       // Start the document.                w.WriteStartDocument();                w.WriteStartElement("kml", "http://earth.google.com/kml/2.1");                w.WriteStartElement("Document");                w.WriteStartElement("name");                w.WriteString("zy's KML");                w.WriteEndElement();                w.WriteStartElement("open");                w.WriteString("1");                w.WriteEndElement();                //style                w.WriteStartElement("Style");                w.WriteAttributeString("id", "normalPlacemark");                w.WriteStartElement("IconStyle");                w.WriteStartElement("Icon");                w.WriteStartElement("href");                w.WriteString("F:/img/web.gif");                w.WriteEndElement();//style                w.WriteEndElement();//iconStyle                w.WriteEndElement();//icon                w.WriteEndElement();//href                       //stylemap                w.WriteStartElement("StyleMap");                w.WriteAttributeString("id", "exampleStyleMap");                w.WriteStartElement("Pair");                w.WriteStartElement("key");                w.WriteString("normal");                w.WriteEndElement();                w.WriteStartElement("styleUrl");                w.WriteString("#normalPlacemark");                w.WriteEndElement();//styleUrl                w.WriteEndElement();//pair                w.WriteEndElement();//StyleMap                       w.WriteStartElement("Placemark");                w.WriteStartElement("Name");                w.WriteString("zy's KML");                w.WriteEndElement();                // Write Point element                       w.WriteStartElement("Point");                w.WriteStartElement("coordinates");                w.WriteString(xx.ToString ()+","+yy.ToString ());                w.WriteEndElement();                w.WriteEndElement();                       w.WriteEndElement(); // Placemark                w.WriteEndElement();//document                w.WriteEndElement(); // kml                       // Ends the document.                w.WriteEndDocument();                       // close writer                w.Close();     }

然后新建RealtimeNetlink.kml文件，每次kml刷新的时候，都重新调用dynamic.kml内容，代码如下：

 

<?xml version="1.0" encoding="UTF-8"?>

<kml xmlns="http://earth.google.com/kml/2.2">

<Document>

<name>RealtimeNetlink </name>

<visibility>1</visibility>

<open>1</open>

<NetworkLink>

<visibility>1</visibility>

<refreshVisibility>1</refreshVisibility>

<flyToView>0</flyToView>

<LookAt>

<longitude>114.12022</longitude>

<latitude>22.55841667</latitude>

<altitude>2000</altitude>

<range>1000</range>

<tilt>0</tilt>

<heading>0</heading>

<altitudeMode>relativeToGround</altitudeMode>

</LookAt>

<Link>

<href>\dynamic.kml</href>

<refreshMode>onInterval</refreshMode>

<refreshInterval>3</refreshInterval>

<viewRefreshMode>onStart</viewRefreshMode>

<viewRefreshTime>3</viewRefreshTime>

</Link>

</NetworkLink>

</Document>

</kml>