mo+c#中鹰眼的实现

<H2> </H2>
<P>//类</P>
<P>using System;</P>

<P>namespace WindowsApplication68
{
 /// <summary>
 /// DragFeedback 的摘要说明。
 /// </summary>
 public class DragFeedback
 {
  public DragFeedback()
  {
   //
   // TOD 在此处添加构造函数逻辑
   //
  }</P>
<P>
  [System.Runtime.InteropServices.DllImportAttribute("gdi32.dll")]
  private static extern bool Rectangle(IntPtr hdc,int ulCornerX, int ulCornerY,int lrCornerX, int lrCornerY);
        [System.Runtime.InteropServices.DllImport("user32.dll") ]
        private static extern IntPtr GetDC(IntPtr hwnd);
  [System.Runtime.InteropServices.DllImport("gdi32.dll") ]
  private static extern int SetROP2(IntPtr hdc,int fnDrawMode);</P>

<P>  public MapObjects2.Rectangle dragfinish(float x,float y)
  {
  
  Rectangle (m_hdc,m_xmin,m_ymin,m_xmax,m_ymax);</P>
<P>        r = new MapObjects2.RectangleClass();</P>
<P> // return the rectangle
       p = new MapObjects2.PointClass();
       p =m_map.ToMapPoint(m_xmin,m_ymin);
       r.Left  =p.X ;
       r.Top =p.Y;</P>
<P>       p =m_map.ToMapPoint(m_xmax,m_ymax);
       r.Right =p.X ;
       r.Bottom =p.Y ;</P>
<P>       return r;
      }
  
  
  
  
  public void dragmove(float x,float y)
  {
          float xnext;
          float ynext;
          xnext=x;
          ynext=y;</P>
<P>         Rectangle(m_hdc,m_xmin,m_ymin,m_xmax,m_ymax);
         m_xmin =m_xmin + Convert.ToInt32 (xnext - m_xprev);
         m_xmax =m_xmax + Convert.ToInt32 (xnext - m_xprev);
         m_ymin =m_ymin + Convert.ToInt32 (ynext - m_yprev);
         m_ymax =m_ymax + Convert.ToInt32 (ynext - m_yprev);</P>
<P>         Rectangle(m_hdc,m_xmin,m_ymin,m_xmax,m_ymax);
         m_xprev =Convert.ToInt32(xnext);
         m_yprev =Convert.ToInt32(ynext);</P>
<P>  }
  
  public void dragstart(MapObjects2.IMoRectangle rect,AxMapObjects2.AxMap map,float x,float y)
  {
            float xmin,ymin;
   float xmax,ymax;
           m_map =map;</P>
<P>       // initialize the hwnd and hdc variables
           m_hwnd =m_map.Handle  ;
  
           m_hdc =GetDC(m_map.Handle );
   </P>
<P>           SetROP2(m_hdc,10);  // raster op for inverting</P>
<P>          p =new MapObjects2.PointClass();
          p.X =rect.Left;
          p.Y =rect.Top;</P>
<P>          xmin=0;
          ymin=0;
          xmax=0;
          ymax=0;
           m_map.FromMapPoint(p,ref xmin,ref ymin);</P>
<P>         p.X =rect.Right;
         p.Y =rect.Bottom;
         m_map.FromMapPoint(p,ref xmax,ref ymax);</P>
<P>        m_xmin =Convert.ToInt32 (xmin);
        m_ymin =Convert.ToInt32 (ymin);
        m_xmax =Convert.ToInt32 (xmax);
        m_ymax =Convert.ToInt32 (ymax);</P>
<P>  // draw the rectangle
      Rectangle(m_hdc,m_xmin,m_ymin,m_xmax,m_ymax);</P>
<P>  // remember the click position
     m_xprev =Convert.ToInt32 (x);
     m_yprev =Convert.ToInt32(y);
 }</P>
<P>  protected  MapObjects2.Point p ;
  protected  AxMapObjects2.AxMap m_map;
  protected  System.IntPtr  m_hdc;
  protected   System.IntPtr  m_hwnd;
  protected  int m_xmin;
  protected int  m_ymin;
  protected int  m_xmax;
  protected int  m_ymax;
  protected int  m_xprev;
  protected int  m_yprev;
     public   MapObjects2.Rectangle  r ;
 }
}</P>
<P>//程序主体</P>
<P>using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;</P>
<P>
namespace WindowsApplication68
{
 /// <summary>
 /// Form1 的摘要说明。
 /// </summary>
 public class Form1 : System.Windows.Forms.Form
 {
  private AxMapObjects2.AxMap axMap1;
  private AxMapObjects2.AxMap axMap2;
  private System.Windows.Forms.Button button1;
  
        public DragFeedback  DragFeedbk  ;
  /// <summary>
  /// 必需的设计器变量。
  /// </summary>
  private System.ComponentModel.Container components = null;</P>
<P>  public Form1()
  {
   //
   // Windows 窗体设计器支持所必需的
   //
   InitializeComponent();</P>
<P>   //
   // TOD 在 InitializeComponent 调用后添加任何构造函数代码
   //
  }</P>
<P>  /// <summary>
  /// 清理所有正在使用的资源。
  /// </summary>
  protected override void Dispose( bool disposing )
  {
   if( disposing )
   {
    if (components != null)
    {
     components.Dispose();
    }
   }
   base.Dispose( disposing );
  }</P>
<P>  #region Windows 窗体设计器生成的代码
  /// <summary>
  /// 设计器支持所需的方法 - 不要使用代码编辑器修改
  /// 此方法的内容。
  /// </summary>
  private void InitializeComponent()
  {
   System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(Form1));
   this.axMap1 = new AxMapObjects2.AxMap();
   this.axMap2 = new AxMapObjects2.AxMap();
   this.button1 = new System.Windows.Forms.Button();
   ((System.ComponentModel.ISupportInitialize)(this.axMap1)).BeginInit();
   ((System.ComponentModel.ISupportInitialize)(this.axMap2)).BeginInit();
   this.SuspendLayout();
   //
   // axMap1
   //
   this.axMap1.Location = new System.Drawing.Point(16, 8);
   this.axMap1.Name = "axMap1";
   this.axMap1.OcxState = ((System.Windows.Forms.AxHost.State)(resources.GetObject("axMap1.OcxState")));
   this.axMap1.Size = new System.Drawing.Size(296, 336);
   this.axMap1.TabIndex = 0;
   this.axMap1.MouseDownEvent += new AxMapObjects2._DMapEvents_MouseDownEventHandler(this.axMap1_MouseDownEvent);
   this.axMap1.AfterLayerDraw += new AxMapObjects2._DMapEvents_AfterLayerDrawEventHandler(this.axMap1_AfterLayerDraw);
   this.axMap1.MouseUpEvent += new AxMapObjects2._DMapEvents_MouseUpEventHandler(this.axMap1_MouseUpEvent);
   //
   // axMap2
   //
   this.axMap2.Location = new System.Drawing.Point(328, 24);
   this.axMap2.Name = "axMap2";
   this.axMap2.OcxState = ((System.Windows.Forms.AxHost.State)(resources.GetObject("axMap2.OcxState")));
   this.axMap2.Size = new System.Drawing.Size(184, 176);
   this.axMap2.TabIndex = 1;
   this.axMap2.MouseDownEvent += new AxMapObjects2._DMapEvents_MouseDownEventHandler(this.axMap2_MouseDownEvent);
   this.axMap2.AfterTrackingLayerDraw += new AxMapObjects2._DMapEvents_AfterTrackingLayerDrawEventHandler(this.axMap2_AfterTrackingLayerDraw);
   this.axMap2.MouseMoveEvent += new AxMapObjects2._DMapEvents_MouseMoveEventHandler(this.axMap2_MouseMoveEvent);
   this.axMap2.MouseUpEvent += new AxMapObjects2._DMapEvents_MouseUpEventHandler(this.axMap2_MouseUpEvent);
   //
   // button1
   //
   this.button1.Location = new System.Drawing.Point(376, 264);
   this.button1.Name = "button1";
   this.button1.Size = new System.Drawing.Size(88, 32);
   this.button1.TabIndex = 2;
   this.button1.Text = "full ";
   this.button1.Click += new System.EventHandler(this.button1_Click);
   //
   // Form1
   //
   this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
   this.ClientSize = new System.Drawing.Size(528, 365);
   this.Controls.Add(this.button1);
   this.Controls.Add(this.axMap2);
   this.Controls.Add(this.axMap1);
   this.Name = "Form1";
   this.Text = "Form1";
   this.Load += new System.EventHandler(this.Form1_Load);
   ((System.ComponentModel.ISupportInitialize)(this.axMap1)).EndInit();
   ((System.ComponentModel.ISupportInitialize)(this.axMap2)).EndInit();
   this.ResumeLayout(false);</P>
<P>  }
  #endregion</P>
<P>  /// <summary>
  /// 应用程序的主入口点。
  /// </summary>
  [STAThread]
  static void Main()
  {
   Application.Run(new Form1());
  }</P>
<P>  private void Form1_Load(object sender, System.EventArgs e)
  {
        MapObjects2.IMoDataConnection dc;
     MapObjects2.IMoMapLayer    layer;
     dc=new MapObjects2.DataConnectionClass();
        <a href='mailtdc.Database=@"f:\data\usa' target="_blank" >dc.Database=@"f:\data\usa</A>";
   if (dc.Connect() )
   {
     layer=new MapObjects2.MapLayerClass();
              layer.GeoDataset=dc.FindGeoDataset("STATES");
              layer.Symbol.Color=Convert.ToUInt32(MapObjects2.ColorConstants.moPaleYellow) ;
              axMap1.Layers.Add(layer);</P>
<P>     layer=new MapObjects2.MapLayerClass();
     layer.GeoDataset=dc.FindGeoDataset("ushigh");
     layer.Symbol.Color=Convert.ToUInt32(MapObjects2.ColorConstants.moDarkGreen) ;
     axMap1.Layers.Add(layer);</P>
<P>     layer=new MapObjects2.MapLayerClass();
     layer.GeoDataset=dc.FindGeoDataset("uslakes");
     layer.Symbol.Color=Convert.ToUInt32(MapObjects2.ColorConstants.moBlue) ;
     axMap1.Layers.Add(layer);</P>
<P>     layer=new MapObjects2.MapLayerClass();
     layer.GeoDataset=dc.FindGeoDataset("STATES");
     layer.Symbol.Color=Convert.ToUInt32(MapObjects2.ColorConstants.moPaleYellow) ;
     axMap2.Layers.Add(layer);</P>
<P>              DragFeedbk =new DragFeedback();
    
  
   }</P>
<P>  }</P>
<P>  </P>
<P>  private void button1_Click(object sender, System.EventArgs e)
  {
   axMap1.Extent=axMap1.FullExtent;
   </P>
<P>  }</P>
<P>  private void axMap1_MouseDownEvent(object sender, AxMapObjects2._DMapEvents_MouseDownEvent e)
  {
   MapObjects2.Rectangle r;
   r=new MapObjects2.RectangleClass();
   if (e.button==1)
   { </P>
<P>    r=axMap1.TrackRectangle();
    axMap1.Extent=r;
               </P>
<P>   }
   else
   {   this.Cursor=Cursors.Hand ;
    axMap1.Pan();</P>
<P>
   }</P>
<P>  }</P>
<P>  private void axMap1_AfterLayerDraw(object sender, AxMapObjects2._DMapEvents_AfterLayerDrawEvent e)
  {
   if (e.index ==0)
   {
    
    axMap2.TrackingLayer.Refresh(true,0);
   }
  }</P>
<P>  private void axMap2_AfterTrackingLayerDraw(object sender, AxMapObjects2._DMapEvents_AfterTrackingLayerDrawEvent e)
  {
   MapObjects2.Symbol sym;
   sym=new MapObjects2.SymbolClass();
   sym.OutlineColor=Convert.ToUInt32 (MapObjects2.ColorConstants.moRed);
   sym.Style =1 ;
   axMap2.DrawShape(axMap1.Extent,sym);</P>
<P>  }</P>
<P>  private void axMap2_MouseDownEvent(object sender, AxMapObjects2._DMapEvents_MouseDownEvent e)
  {
   MapObjects2.Point p;
   p=new MapObjects2.PointClass();
   p=axMap2.ToMapPoint(e.x,e.y );
   if (axMap1.Extent.IsPointIn(p))
   {
            DragFeedbk .dragstart(axMap1.Extent ,axMap2,e.x,e.y );
   </P>
<P>   }
  
  }</P>
<P>  private void axMap2_MouseMoveEvent(object sender, AxMapObjects2._DMapEvents_MouseMoveEvent e)
  {
   if (e.button==1)
   {
    DragFeedbk.dragmove(e.x,e.y );</P>
<P>   }
  }</P>
<P>  private void axMap1_MouseUpEvent(object sender, AxMapObjects2._DMapEvents_MouseUpEvent e)
  {
  
  }</P>
<P>  private void axMap2_MouseUpEvent(object sender, AxMapObjects2._DMapEvents_MouseUpEvent e)
  {
   axMap2.CtlRefresh();
   axMap1.Extent=DragFeedbk.dragfinish(e.x,e.y );</P>
<P>  }</P>
<P>
 }
}
</P>

<P> 刚刚接触c# ，希望能够学到更多！</P><img src="images/post/smile/dvbbs/em02.gif" /><img src="images/post/smile/dvbbs/em02.gif" />  

<P>用VC怎么写？谁来改写一下？</P><img src="images/post/smile/dvbbs/em02.gif" /><img src="images/post/smile/dvbbs/em01.gif" /><img src="images/post/smile/dvbbs/em05.gif" />

<P>能改成VB吗？？</P><img src="images/post/smile/dvbbs/em01.gif" />

太感谢了，我正需要。

<P>希望和用c#的朋友交流</P>
<P>qq：276446202</P><img src="images/post/smile/dvbbs/em04.gif" />