form1.cs

C# 做的简单的GPS软件

// Copyright 2006 ESRI
// 
// All rights reserved under the copyright laws of the United States
// and applicable international laws, treaties, and conventions.
// 
// You may freely redistribute and use this sample code, with or
// without modification, provided you include the original copyright
// notice and use restrictions.
// 
// See use restrictions at /arcgis/developerkit/userestrictions.
// 

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using ESRI.ArcGIS.Mobile.Gps;

namespace WinGPS
{
  public partial class Form1 : Form
  {
    GpsEventArgs m_gpsea = null;

    public Form1()
    {
      InitializeComponent();
    }

    private void butCon_Click(object sender, EventArgs e)
    {
      butCon.Enabled = false;
      butDiscon.Enabled = true;

      serialPortGpsConnection1.Open();
      if (serialPortGpsConnection1.IsOpen)
      {
        timer1.Enabled = true;
      }
      else
      {
        butCon.Enabled = true;
        butDiscon.Enabled = false;
        timer1.Enabled = false;
      }
    }

    private void butDiscon_Click(object sender, EventArgs e)
    {
      butDiscon.Enabled = false;
      butCon.Enabled = true;
      timer1.Enabled = false;
      serialPortGpsConnection1.Close();
    }

    private void DisplaySummary()
    {

      if (m_gpsea == null)
        return;

      labelLatitude.Text = m_gpsea.Latitude.ToString();
      labelLongitude.Text = m_gpsea.Longitude.ToString();
      labelAltitude.Text = m_gpsea.Altitude.ToString();

      labelFixMode.Text = m_gpsea.FixStatus.ToString();

      labelPDOP.Text = m_gpsea.Pdop.ToString();
      labelVDOP.Text = m_gpsea.Vdop.ToString();
      labelHDOP.Text = m_gpsea.Hdop.ToString();

      DateTime utc = DateTime.MinValue;
      utc = m_gpsea.Time;

      labelDate.Text = utc.ToShortDateString();
      labelTimeLocal.Text = utc.ToLocalTime().ToString();
      labelTime.Text = utc.ToShortTimeString();
    }

    private void DisplaySatellites()
    {
      labelSatellitesInView.Text = m_gpsea.FixSatelliteCount.ToString();

			//code from Coding4Fun: http://msdn.microsoft.com/coding4fun/someassemblyrequired/whereami/default.aspx

			Pen circlePen = new Pen(System.Drawing.Color.DarkBlue,1);

			Graphics g = picSats.CreateGraphics();
		
			int centerX = picSats.Width/2;
			int centerY = picSats.Height/2;

			double maxRadius = (Math.Min(picSats.Height,picSats.Width)-20) / 2;

			//draw circles
			double[] elevations = new double[] {0,Math.PI/2, Math.PI/3 ,Math.PI / 6};

			foreach(double elevation in elevations)
			{
				double radius = (double)System.Math.Cos(elevation) * maxRadius;
				g.DrawEllipse(circlePen,(int)(centerX - radius) ,(int)(centerY - radius),(int)(2 * radius),(int)( 2*  radius));
			}
			//90 degrees elevation reticule
			g.DrawLine(circlePen,new Point(centerX-3,centerY),new Point(centerX + 3,centerY));
			g.DrawLine(circlePen,new Point(centerX,centerY-3),new Point(centerX,centerY+3));

      Pen satPen = new Pen(System.Drawing.Color.Green, 4);

      listSatellites.Items.Clear();

      try
      {
        foreach (Satellite sat in m_gpsea.GetSatellites())
        {
          if (null == sat) return;
          ListViewItem lvItem = new ListViewItem
            (
              new string[] 
              {
                sat.Id.ToString(),
                sat.Elevation.ToString(),
                sat.Azimuth.ToString(),
								sat.Snr.ToString(),
              }
            );

          listSatellites.Items.Add(lvItem);

          //draw satellites
          double h = (double)System.Math.Cos((sat.Elevation * Math.PI) / 180) * maxRadius;

          int satX = (int)(centerX + h * Math.Sin((sat.Azimuth * Math.PI) / 180));
          int satY = (int)(centerY - h * Math.Cos((sat.Azimuth * Math.PI) / 180));

          g.DrawRectangle(satPen, satX, satY, 4, 4);
          g.DrawString(sat.Id.ToString(), new Font("Verdana", 8, FontStyle.Regular), new System.Drawing.SolidBrush(Color.Black), new Point(satX + 5, satY + 5));
        }
      }
      catch
      {
        return;
      }
    }
        
    private void timer1_Tick(object sender, EventArgs e)
    {
      DisplaySummary();
      DisplaySatellites();
    }

    private void serialPortGpsConnection1_GpsChanged(object sender, GpsEventArgs e)
    {
      if (InvokeRequired)
      {
        Invoke(new GpsChangedEventHandler(serialPortGpsConnection1_GpsChanged), sender, e);
        return;
      }

      m_gpsea = e;
      if (chkRaw.Checked)
      {
        NMEAText.Text = NMEAText.Text + e.Sentence + "\r\n";
      }
    }

    private void Form1_Load(object sender, EventArgs e)
    {
      if (string.IsNullOrEmpty(mapCache1.Url))
      {
        MessageBox.Show("To use the GPS sample you need to specify, at the design time, a URL of a mobile server that covers your area.", "GPS Sample error - MapCache.URL is empty.");
        this.Close();
        return;
      }
      //initialize
			//serialPortGpsConnection1.PortName = "COM5"; // hardcoded
			lblGPSComPort.Text = serialPortGpsConnection1.PortName;
      butDiscon.Enabled = false;

      //create the cache and open
      if (mapCache1.Exists)
        mapCache1.Delete();

      mapCache1.Create();

      mapCache1.Open();
    }

    private void map1_ExtentChanged(object sender, EventArgs e)
    {
      mapCache1.GetDataAsync(map1, true, null);
    }

    private void butClear_Click(object sender, EventArgs e)
    {
      NMEAText.Clear();
    }

  }
}