mo+c#中鹰眼的实现

mo+c#中鹰眼的实现

//类

using System;

namespace WindowsApplication68
{
/**//// <summary>
/// DragFeedback 的摘要说明。
/// </summary>
public class DragFeedback
{
  public DragFeedback()
  {
   //
   // TODO: 在此处添加构造函数逻辑
   //
  }

  [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);

  public MapObjects2.Rectangle dragfinish(float x,float y)
  {

  Rectangle (m_hdc,m_xmin,m_ymin,m_xmax,m_ymax);

        r = new MapObjects2.RectangleClass();

// return the rectangle
       p = new MapObjects2.PointClass();
       p =m_map.ToMapPoint(m_xmin,m_ymin);
       r.Left  =p.X ;
       r.Top =p.Y;

       p =m_map.ToMapPoint(m_xmax,m_ymax);
       r.Right =p.X ;
       r.Bottom =p.Y ;

       return r;
      }




  public void dragmove(float x,float y)
  {
          float xnext;
          float ynext;
          xnext=x;
          ynext=y;

         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);

         Rectangle(m_hdc,m_xmin,m_ymin,m_xmax,m_ymax);
         m_xprev =Convert.ToInt32(xnext);
         m_yprev =Convert.ToInt32(ynext);

  }

  public void dragstart(MapObjects2.IMoRectangle rect,AxMapObjects2.AxMap map,float x,float y)
  {
            float xmin,ymin;
   float xmax,ymax;
           m_map =map;

       // initialize the hwnd and hdc variables
           m_hwnd =m_map.Handle  ;

           m_hdc =GetDC(m_map.Handle );


           SetROP2(m_hdc,10);  // raster op for inverting

          p =new MapObjects2.PointClass();
          p.X =rect.Left;
          p.Y =rect.Top;

          xmin=0;
          ymin=0;
          xmax=0;
          ymax=0;
           m_map.FromMapPoint(p,ref xmin,ref ymin);

         p.X =rect.Right;
         p.Y =rect.Bottom;
         m_map.FromMapPoint(p,ref xmax,ref ymax);

        m_xmin =Convert.ToInt32 (xmin);
        m_ymin =Convert.ToInt32 (ymin);
        m_xmax =Convert.ToInt32 (xmax);
        m_ymax =Convert.ToInt32 (ymax);

  // draw the rectangle
      Rectangle(m_hdc,m_xmin,m_ymin,m_xmax,m_ymax);

  // remember the click position
     m_xprev =Convert.ToInt32 (x);
     m_yprev =Convert.ToInt32(y);
}

  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 ;
}
}

//程序主体

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

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;

  public Form1()
  {
   //
   // Windows 窗体设计器支持所必需的
   //
   InitializeComponent();

   //
   // TODO: 在 InitializeComponent 调用后添加任何构造函数代码
   //
  }

  /**//// <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 );
  }

  Windows 窗体设计器生成的代码

  /**//// <summary>
  /// 应用程序的主入口点。
  /// </summary>
  [STAThread]
  static void Main()
  {
   Application.Run(new Form1());
  }

  private void Form1_Load(object sender, System.EventArgs e)
  {
        MapObjects2.IMoDataConnection dc;
     MapObjects2.IMoMapLayer    layer;
     dc=new MapObjects2.DataConnectionClass();
        dc.Database=@"f:\data\usa";
   if (dc.Connect() )
   {
     layer=new MapObjects2.MapLayerClass();
              layer.GeoDataset=dc.FindGeoDataset("STATES");
              layer.Symbol.Color=Convert.ToUInt32(MapObjects2.ColorConstants.moPaleYellow) ;
              axMap1.Layers.Add(layer);

     layer=new MapObjects2.MapLayerClass();
     layer.GeoDataset=dc.FindGeoDataset("ushigh");
     layer.Symbol.Color=Convert.ToUInt32(MapObjects2.ColorConstants.moDarkGreen) ;
     axMap1.Layers.Add(layer);

     layer=new MapObjects2.MapLayerClass();
     layer.GeoDataset=dc.FindGeoDataset("uslakes");
     layer.Symbol.Color=Convert.ToUInt32(MapObjects2.ColorConstants.moBlue) ;
     axMap1.Layers.Add(layer);

     layer=new MapObjects2.MapLayerClass();
     layer.GeoDataset=dc.FindGeoDataset("STATES");
     layer.Symbol.Color=Convert.ToUInt32(MapObjects2.ColorConstants.moPaleYellow) ;
     axMap2.Layers.Add(layer);

              DragFeedbk =new DragFeedback();


   }

  }



  private void button1_Click(object sender, System.EventArgs e)
  {
   axMap1.Extent=axMap1.FullExtent;


  }

  private void axMap1_MouseDownEvent(object sender, AxMapObjects2._DMapEvents_MouseDownEvent e)
  {
   MapObjects2.Rectangle r;
   r=new MapObjects2.RectangleClass();
   if (e.button==1)
   {

    r=axMap1.TrackRectangle();
    axMap1.Extent=r;


   }
   else
   {   this.Cursor=Cursors.Hand ;
    axMap1.Pan();

   }

  }

  private void axMap1_AfterLayerDraw(object sender, AxMapObjects2._DMapEvents_AfterLayerDrawEvent e)
  {
   if (e.index ==0)
   {

    axMap2.TrackingLayer.Refresh(true,0);
   }
  }

  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);

  }

  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 );


   }

  }

  private void axMap2_MouseMoveEvent(object sender, AxMapObjects2._DMapEvents_MouseMoveEvent e)
  {
   if (e.button==1)
   {
    DragFeedbk.dragmove(e.x,e.y );

   }
  }

  private void axMap1_MouseUpEvent(object sender, AxMapObjects2._DMapEvents_MouseUpEvent e)
  {

  }

  private void axMap2_MouseUpEvent(object sender, AxMapObjects2._DMapEvents_MouseUpEvent e)
  {
   axMap2.CtlRefresh();
   axMap1.Extent=DragFeedbk.dragfinish(e.x,e.y );

  }

}
}
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原文地址：https://www.cnblogs.com/gwazy/p/111129.html