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; }

}
}
}