public string ShowUserTrajectories(int id)
{
if (id == -1)
{
return(GPSTrajectoryWriter.TrajectoriesToJson(myUserTrajectories.GPSTrajectoriesData));
}
else
{
return(GPSTrajectoryWriter.TrajectoriesToJson(myUserTrajectories.GetTrajectoriesByUserID(id)));
}
}
public string SimplifyGPSTest()
{
Random r = new Random();
int index = r.Next(myUserTrajectories.GPSTrajectoriesData.Count);
var path = myUserTrajectories.GPSTrajectoriesData[index];
string oldjson = GPSTrajectoryWriter.SingleTrajectoryToBaiduMapJson(path);
//获取简化后的轨迹
GPSDouglasSimplification gds = new GPSDouglasSimplification(path, 20);
var newpath = gds.Excute();
return(oldjson + "\n" + GPSTrajectoryWriter.SingleTrajectoryToBaiduMapJson(newpath));
}
public string TestRTree()
{
Random r = new Random();
int index = r.Next(myUserTrajectories.GPSTrajectoriesData.Count);
StringBuilder roads = new StringBuilder();
var path = myUserTrajectories.GPSTrajectoriesData[index];
for (int i = 0; i < path.GPSCount; i++)
{
//这里的查询可以优化
var result = myRoadNetwork.RoadSegmentRtree.Query(new Envelope(path[i]));
foreach (RoadSegment item in result)
{
roads.Append(item.ToString() + "\n");
}
}
return(GPSTrajectoryWriter.SingleTrajectoryToBaiduMapJson(path) + "\n" + roads.ToString());
}
private static void GPSTraceToShp()
{
OpenFileDialog ofd = new OpenFileDialog();
ofd.Filter = "文本文件|*.txt;*.csv";
ofd.RestoreDirectory = true;
if (ofd.ShowDialog() == DialogResult.OK)
{
Console.WriteLine("Application thread ID: {0}",
Thread.CurrentThread.ManagedThreadId);
var gpsData = GPSIO.GPSTrajectoryReader.ReadAll(ofd.FileName);
var t = Task.Run(() =>
{
GPSTrajectoryWriter.ExportGPSTrajectoriesToShapefile("GPSTraces.shp", gpsData.GPSTrajectoriesData);
Console.WriteLine("Data Transform Completed!");
Console.ReadKey();
});
Console.Write("Please wait for completition");
t.Wait();
}
}
/// <summary>
/// 导出轨迹数据到shapefile
/// </summary>
public void ExportGPSData()
{
GPSTrajectoryWriter.ExportGPSTrajectoriesToShapefile("GPSShapefile.shp", myUserTrajectories.GPSTrajectoriesData);
MessageBox.Show("导出数据完成！");
}
