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   源码介绍

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace Blaney
{
    public partial class frmMain : Form
    {
        Radar _radar;
        Timer t = new Timer();
        Random rnd = new Random();

        public frmMain()
        {
            InitializeComponent();
            // internal item update timer
            t.Interval = 60;
            t.Tick  = new EventHandler(t_Tick);
            t.Enabled = true;
        }

        RadarItem item1 = new SquareRadarItem(1, 8, 190, 60);
        RadarItem item2 = new CircleRadarItem(2, 8, 45, 45);
        RadarItem item3 = new TriangleRadarItem(3, 8, 30, 30);

        int GetDelta()
        {
            int i = rnd.Next(0, 2);
            if (i == 0)
                i--;
            return i;
        }

        void t_Tick(object sender, EventArgs e)
        {
            // select which of the three items to update
            int i = rnd.Next(1, 4);

            switch (i)
            {
                case 1:
                    item1.Azimuth  = GetDelta();
                    item1.Elevation  = GetDelta();
                    _radar.AddItem(item1);
                    break;
                case 2:
                    item2.Azimuth  = GetDelta();
                    item2.Elevation  = GetDelta();
                    _radar.AddItem(item2);
                    break;
                case 3:
                    item3.Azimuth  = GetDelta(); //方位角又称地平经度(Azimuth (angle)缩写Az)，是在平面上量度物体之间的角度差的方法之一。是从某点的指北方向线起，依顺时针方向到目标方向线之间的水平夹角。
                    item3.Elevation  = GetDelta();//仰角
                    _radar.AddItem(item3);
                    break;
            }
        }

        private void frmMain_Load(object sender, EventArgs e)
        {
            _radar = new Radar(pictureBox1.Width);
            pictureBox1.Image = _radar.Image;
            _radar.ImageUpdate  = new ImageUpdateHandler(_radar_ImageUpdate);
            _radar.DrawScanInterval = 60;
            _radar.DrawScanLine = true;
        }

        void _radar_ImageUpdate(object sender, ImageUpdateEventArgs e)
        {
            // this event is important to catch!
            pictureBox1.Image = e.Image;
            string dd = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss").Replace(" ", "_").Replace("-", "_").Replace(":", "_");
            e.Image.Save(dd   ".jpg", System.Drawing.Imaging.ImageFormat.Jpeg);
        }
    }
}