ArcEngine中动态移动点的效果实现代码

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.Carto;
using ESRI.ArcGIS.Controls;
using ESRI.ArcGIS.Display;
using ESRI.ArcGIS.Geometry;
using ESRI.ArcGIS.MapControl;
using ESRI.ArcGIS.ToolbarControl;
using ESRI.ArcGIS.SystemUI;
using ESRI.ArcGIS.Output;
using ESRI.ArcGIS.esriSystem;
using ESRI.ArcGIS.Geodatabase;
using ESRI.ArcGIS.DataSourcesGDB;
namespace VehicleMove
{
    public partial class frmMain : Form
    {
        double dx = 116.315691;
        double dy = 39.991964;
        IActiveView pactiveview;
        public frmMain（）
        {
            InitializeComponent（）;
            //
            timer1.Enabled = false;
            timer2.Enabled = false;
            timer3.Enabled = false;
            timer4.Enabled = false;
            timer5.Enabled = false;
            //
            this.axToolbarControl1.SetBuddyControl（this.axMapControl1）;
            pactiveview = this.axMapControl1.ActiveView;
        }
        //方法1：缺点：有拖尾除非每次刷新，但是刷新会出现不停闪烁   
        private void timer1_Tick（object sender EventArgs e）
        {
            dx = dx + 0.001;
            dy = dy - 0.0001;
            MoveCar（）;
        }
        private void MoveCar（）
        {
            //得到当前活动范围

            IActiveView pActiveView = axMapControl1.ActiveView;
            //开始画笔 
            pActiveView.ScreenDisplay.StartDrawing（pActiveView.ScreenDisplay.hDC （short）esriScreenCache.esriNoScreenCache）;
            IPoint ppoint;
            IGeometry pgeo;
            IPictureMarkerSymbol psymbol = new PictureMarkerSymbolClass（）;
            IRgbColor prgbcolor = new RgbColorClass（）;
            prgbcolor.Red = 0;
            prgbcolor.Green = 0;
            prgbcolor.Blue = 0;

            psymbol.BitmapTransparencyColor  = prgbcolor;
            psymbol.CreateMarkerSymbolFromFile（esriIPictureType.esriIPictureBitmap@“E:\layers\2.bmp“）;
            psymbol.Size = 15;
            psymbol.Angle = 270;

            //ISimpleMarkerSymbol psimplesymbol = new SimpleMarkerSymbolClass（）;
            //psimplesymbol.Size = 10;
            //psimplesymbol.Color = （IColor）prgbcolor;

            ppoint = new PointClass（）;
            ppoint.PutCoords（dxdy）;
            pgeo = ppoint;

            pActiveView.ScreenDisplay.SetSymbol（（ISymbol）psymbol）;
            pActiveView.ScreenDisplay.DrawPoint（ppoint）;
            //结束画笔
            pActiveView.ScreenDisplay.UpdateWindow（）;
            pActiveView.ScreenDisplay.FinishDrawing（）;
            //System.object obj = psymbol;
            //this.axMapControl1.DrawShape（pgeo ref obj）;
         
            //this.axMapControl1.CenterAt（ppoint）;
            IEnvelope penv = this.axMapControl1.Extent;
            penv.CenterAt（ppoint）;
            this.axMapControl1.Extent = penv;
        }
        pr