MapObjects2 在C#中的应用--基本地图功能

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
 
namespace Artemis.IVS.Test
{
     /// <summary>
     /// 处理实例
     /// </summary>
     public class FrmMain : System.Windows.Forms.Form
     {
          private AxMapObjects2.AxMap mapMain;
          private System.Windows.Forms.MainMenu mainMenu1;
          private System.Windows.Forms.MenuItem miZoomIn;
          private System.Windows.Forms.MenuItem miZoomOut;
          private System.Windows.Forms.MenuItem miPan;
          private System.Windows.Forms.MenuItem miFullView;
          private int CurOperate = 0;
          private System.Windows.Forms.MenuItem miSelectByPoint;
          private System.Windows.Forms.MenuItem miDistance;
          private System.Windows.Forms.MenuItem miArea;
         /// <summary>
         /// 必需的设计器变量。
         /// </summary>
          private System.ComponentModel.Container components = null;
 
         public FrmMain()
         {
              //
              // Windows 窗体设计器支持所必需的
              //
              InitializeComponent();
         }
 
         /// <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 );
         }
 
          #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(FrmMain));
              this.mapMain = new AxMapObjects2.AxMap();
              this.mainMenu1 = new System.Windows.Forms.MainMenu();
              this.miZoomIn = new System.Windows.Forms.MenuItem();
              this.miZoomOut = new System.Windows.Forms.MenuItem();
              this.miPan = new System.Windows.Forms.MenuItem();
              this.miFullView = new System.Windows.Forms.MenuItem();
              this.miSelectByPoint = new System.Windows.Forms.MenuItem();
              this.miDistance = new System.Windows.Forms.MenuItem();
              this.miArea = new System.Windows.Forms.MenuItem();
              ((System.ComponentModel.ISupportInitialize)(this.mapMain)).BeginInit();
              this.SuspendLayout();
              //
              // mapMain
              //
              this.mapMain.Dock = System.Windows.Forms.DockStyle.Fill;
              this.mapMain.Location = new System.Drawing.Point(0, 0);
              this.mapMain.Name = "mapMain";
              this.mapMain.OcxState = ((System.Windows.Forms.AxHost.State)(resources.GetObject("mapMain.OcxState")));
              this.mapMain.Size = new System.Drawing.Size(592, 401);
              this.mapMain.TabIndex = 0;
              this.mapMain.MouseDownEvent += new AxMapObjects2._DMapEvents_MouseDownEventHandler(this.mapMain_MouseDownEvent);
              //
              // mainMenu1
              //
              this.mainMenu1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
                                                                                                    this.miZoomIn,
                                                                                                    this.miZoomOut,
                                                                                                    this.miPan,
                                                                                                    this.miFullView,
                                                                                                    this.miSelectByPoint,
                                                                                                    this.miDistance,
                                                                                                    this.miArea});
              //
              // miZoomIn
              //
              this.miZoomIn.Index = 0;
              this.miZoomIn.Text = "放大";
              this.miZoomIn.Click += new System.EventHandler(this.miZoomIn_Click);
              //
              // miZoomOut
              //
              this.miZoomOut.Index = 1;
              this.miZoomOut.Text = "缩小";
              this.miZoomOut.Click += new System.EventHandler(this.miZoomOut_Click);
              //
              // miPan
              //
              this.miPan.Index = 2;
              this.miPan.Text = "漫游";
              this.miPan.Click += new System.EventHandler(this.miPan_Click);
              //
              // miFullView
              //
              this.miFullView.Index = 3;
              this.miFullView.Text = "全图";
              this.miFullView.Click += new System.EventHandler(this.miFullView_Click);
              //
              // miSelectByPoint
              //
              this.miSelectByPoint.Index = 4;
              this.miSelectByPoint.Text = "点选";
              this.miSelectByPoint.Click += new System.EventHandler(this.miSelectByPoint_Click);
              //
              // miDistance
              //
              this.miDistance.Index = 5;
              this.miDistance.Text = "距离";
              this.miDistance.Click += new System.EventHandler(this.miDistance_Click);
              //
              // miArea
              //
              this.miArea.Index = 6;
              this.miArea.Text = "面积";
              this.miArea.Click += new System.EventHandler(this.miArea_Click);
              //
              // FrmMain
              //
              this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
              this.ClientSize = new System.Drawing.Size(592, 401);
              this.Controls.Add(this.mapMain);
              this.Menu = this.mainMenu1;
              this.Name = "FrmMain";
              this.Text = "Artemis.IVS.Test";
              this.Load += new System.EventHandler(this.FrmMain_Load);
              ((System.ComponentModel.ISupportInitialize)(this.mapMain)).EndInit();
              this.ResumeLayout(false);
 
         }
          #endregion
 
         /// <summary>
         /// 应用程序的主入口点。
         /// </summary>
          [STAThread]
         static void Main()
         {
              Application.Run(new FrmMain());
         }
        
         /// <summary>
         /// 全图
         /// </summary>
          private void miFullView_Click(object sender, System.EventArgs e)
         {
              this.CurOperate = 4;
              mapMain.Extent = mapMain.FullExtent;
              mapMain.MousePointer = MapObjects2.MousePointerConstants.moDefault;
         }
        
         /// <summary>
         /// 漫游
         /// </summary>
          private void miPan_Click(object sender, System.EventArgs e)
         {
              this.CurOperate = 3;
              mapMain.MousePointer = MapObjects2.MousePointerConstants.moPan;
         }
 
         /// <summary>
         /// 缩小
         /// </summary>
          private void miZoomOut_Click(object sender, System.EventArgs e)
         {
              this.CurOperate = 2;
              mapMain.MousePointer = MapObjects2.MousePointerConstants.moZoomOut;
         }
 
         /// <summary>
         /// 放大
         /// </summary>
          private void miZoomIn_Click(object sender, System.EventArgs e)
         {
              this.CurOperate = 1;
              mapMain.MousePointer = MapObjects2.MousePointerConstants.moZoomIn;
         }
 
         /// <summary>
         /// 放大缩小等的处理过程
         /// </summary>
          private void mapMain_MouseDownEvent(object sender, AxMapObjects2._DMapEvents_MouseDownEvent e)
         {
              MapObjects2.Rectangle rect;
              MapObjects2.Point pt = mapMain.ToMapPoint(e.x,e.y);
 
              if(e.button == 2) this.CurOperate = 0;//右键点击取消
 
              switch(this.CurOperate)
              {
                   case 1://放大
                   {
                       rect = mapMain.TrackRectangle();
                      
                        if(rect == null|| (rect.Width < 0.00005) || (rect.Height < 0.00005))
                       {                          
                            rect = mapMain.Extent;
                            rect.ScaleRectangle(0.6667);
                            rect.Offset(-(rect.Center.X - pt.X),-(rect.Center.Y - pt.Y));
                       }
                        mapMain.Extent = rect;
                       break;
                   }
                   case 2://缩小
                   {
                       rect = mapMain.TrackRectangle();
                      
                       if ((null == rect) || (rect.Width < 0.00005) || (rect.Height < 0.00005))
                       {
                            rect = mapMain.Extent;
                            rect.ScaleRectangle(1.5);
                            rect.Offset(-(rect.Center.X - pt.X),-(rect.Center.Y - pt.Y));
                       }
                       else
                       {   
                            double dRate = mapMain.Extent.Width / rect.Width * 10; 
                            rect.ScaleRectangle(dRate);
                       }
 
                        mapMain.Extent = rect;
                       break;
                   }
                   case 3://漫游
                   {
                        mapMain.Pan();
                       break;
                   }
                   case 5://点选
                   {
                      
                       break;
                   }
                   case 6://距离
                   {
                        MapObjects2.Points  pts;
                       pts = (MapObjects2.Points)mapMain.TrackLine().Parts.Item(0);
                       double dDistance = 0;
                        for(int i=0;i<pts.Count-1;i++)
                       {
                            dDistance += Math.Sqrt(pts.Item(i).X*pts.Item(i).X + pts.Item(i).Y*pts.Item(i).Y);
                       }
                        this.Text = mapMain.ToMapDistance((float)dDistance).ToString();
                       break;
                   }
                   case 7://面积
                   {
                        MapObjects2.Polygon ply = mapMain.TrackPolygon();
                       double dArea = ply.Area;
                        this.Text = mapMain.ToMapDistance((float)dArea).ToString();
                       break;
                   }
                   default://箭头
                   {
                        mapMain.MousePointer = MapObjects2.MousePointerConstants.moDefault;
                       break;
                   }
              }
         }
 
         /// <summary>
         /// 点选
         /// </summary>
          private void miSelectByPoint_Click(object sender, System.EventArgs e)
         {
              this.CurOperate = 5;
              mapMain.MousePointer = MapObjects2.MousePointerConstants.moArrowQuestion;
         }
 
         /// <summary>
         /// 距离
         /// </summary>
          private void miDistance_Click(object sender, System.EventArgs e)
         {
              this.CurOperate = 6;
              mapMain.MousePointer = MapObjects2.MousePointerConstants.moCross;
         }
 
         /// <summary>
         /// 面积
         /// </summary>
          private void miArea_Click(object sender, System.EventArgs e)
         {
              this.CurOperate = 7;
              mapMain.MousePointer = MapObjects2.MousePointerConstants.moCross;
         }
     }
}