MO 基本的图层动态添加，放大、缩小、漫游功能

最近在学mo，主要用c#，由于这方面的资料少，自己的e文又不好，所以过了很长时间还是收效甚微，真是郁闷。

这是我的一个小程序，主要用mo+c#，实现了基本的图层动态添加，放大、缩小、漫游等基本功能。

以下是代码：

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

namespace gisLx{ public partial class frmMain : Form {  public frmMain()  {   InitializeComponent();  }

  private void frmMain_Load(object sender, EventArgs e)  {   //===============加入地图图层==================//   //定义数据连接   ESRI.MapObjects2.Core.DataConnection moCon = new ESRI.MapObjects2.Core.DataConnectionClass();      //定义图层   ESRI.MapObjects2.Core.MapLayer moLay1 = new ESRI.MapObjects2.Core.MapLayer();   ESRI.MapObjects2.Core.MapLayer moLay2 = new ESRI.MapObjects2.Core.MapLayer();   ESRI.MapObjects2.Core.MapLayer moLay3 = new ESRI.MapObjects2.Core.MapLayer();   ESRI.MapObjects2.Core.MapLayer moLay4 = new ESRI.MapObjects2.Core.MapLayer();      //地图文件都存在用用程序的Data目录下   string shpPath = Application.StartupPath + "file://Data//";   moCon.Database = shpPath;

   if (!moCon.Connect())   //连接不成功就退出   {    MessageBox.Show("在指定的文件夹下没找到图层数据文件");    Application.Exit();   }   else   //连接成功了就加载地图,地图加载顺序一般是面、线、点，先加载的在地图的最下.云南州界   {    moLay1.GeoDataset = moCon.FindGeoDataset("bou1_4l");    this.axMap1.Layers.Add(moLay1);

    moLay2.GeoDataset = moCon.FindGeoDataset("bou2_4l");    this.axMap1.Layers.Add(moLay2);

    moLay3.GeoDataset = moCon.FindGeoDataset("roa_4m");    this.axMap1.Layers.Add(moLay3);

    moLay4.GeoDataset = moCon.FindGeoDataset("XianCh_point");    this.axMap1.Layers.Add(moLay4);   }   //必须进行刷新后才能显示   this.axMap1.Refresh();  }

  private void toolStripButton1_Click(object sender, EventArgs e)  {   //=============鼠标指针变为放大图标================//   this.axMap1.MousePointer = ESRI.MapObjects2.Core.MousePointerConstants.moZoomIn;  }

  private void toolStripButton2_Click(object sender, EventArgs e)  {   //=============鼠标指针变为缩小图标================//   this.axMap1.MousePointer = ESRI.MapObjects2.Core.MousePointerConstants.moZoomOut;  }

  private void toolStripButton3_Click(object sender, EventArgs e)  {   //=============鼠标指针变为漫游图标================//   this.axMap1.MousePointer = ESRI.MapObjects2.Core.MousePointerConstants.moPan;  }

  private void axMap1_MouseDownEvent(object sender, ESRI.MapObjects2.Core.MouseDownEventArgs e)  {   //================鼠标在地图控件按下事件================//   switch (this.axMap1.MousePointer)   {    case ESRI.MapObjects2.Core.MousePointerConstants.moZoomIn:     {      //放大      ESRI.MapObjects2.Core.Rectangle rect;      rect = this.axMap1.TrackRectangle();

      double dWith = rect.Width;      double dHeight = rect.Height;

      if ((rect == null) || (dWith < 0.00005) || (dHeight < 0.00005))      {       ESRI.MapObjects2.Core.Point pt = this.axMap1.ToMapPoint(e.x,e.y);       ESRI.MapObjects2.Core.Rectangle r = this.axMap1.Extent;       r.ScaleRectangle(0.6667);       r.Offset(-(r.Center.X-pt.X),-(r.Center.Y-pt.Y));       this.axMap1.Extent = r;      }      else      {       this.axMap1.Extent = rect;      }      break;     }    case ESRI.MapObjects2.Core.MousePointerConstants.moZoomOut:     {      //缩小      ESRI.MapObjects2.Core.Rectangle rect;

      rect = this.axMap1.TrackRectangle();      if ((rect == null) || (rect.Width < 0.00005) || (rect.Height < 0.00005))      {            rect = this.axMap1.Extent;            rect.ScaleRectangle(1.5);      }      else      {       double dRout = this.axMap1.Extent.Width / rect.Width * 10;       rect.ScaleRectangle(dRout);      }      this.axMap1.Extent = rect;      break;     }    case ESRI.MapObjects2.Core.MousePointerConstants.moPan:     {      //漫游      this.axMap1.Pan();      break;     }   }

  }

  private void toolStripButton4_Click(object sender, EventArgs e)  {   //充满   this.axMap1.Extent = this.axMap1.FullExtent;  }

  private void dotNetBarManager1_ContainerLoadControl(object sender, EventArgs e)  {   //================加载自定义控件================//   BaseItem item = sender as BaseItem;   if (item == null)    return;   if (item.Name == "DockMapIndex")   {    DockContainerItem dockItem = item as DockContainerItem;    treeMapIndex mapIndex = new treeMapIndex();    dockItem.Control = mapIndex;   }   else if (item.Name == "DockLayerControl")   {    DockContainerItem dockItem = item as DockContainerItem;    dockItem.Control = new treeMapIndex();   }   else if (item.Name == "DockLayerTuli")   {    DockContainerItem dockItem = item as DockContainerItem;    dockItem.Control = new treeMapIndex();   }   else if (item.Name == "DockFind")   {    DockContainerItem dockItem = item as DockContainerItem;    dockItem.Control = new treeMapIndex();   }  }

  private void toolStripButton5_Click(object sender, EventArgs e)  {   ESRI.MapObjects2.Core.MapLayer lyr = (ESRI.MapObjects2.Core.MapLayer)axMap1.Layers.Item(0);   lyr.Visible = false;

  }

  private void axMap1_AfterLayerDraw(object sender, ESRI.MapObjects2.Core.AfterLayerDrawEventArgs e)  {   定义区域   //ESRI.MapObjects2.Core.Rectangle FullExtent;   //ESRI.MapObjects2.Core.Rectangle extent;   得到整个地图的范围   //FullExtent = this.axMap1.FullExtent;   的到当前地图的显示范围   //extent = this.axMap1.Extent;   //bool showDetail = (extent.Width < (FullExtent.Width / 4)) ? true : false;   得到第一层，可以指定图层   //ESRI.MapObjects2.Core.IMoLayers lyr;   //lyr = this.axMap1.Layers.Item(0);   //if (showDetail == true)   //{ lyr.Item.Visible = true; }   //else   //{ lyr.Item.Visible = false; }

     } }}