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：

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>