form06.frm

给出了详细的vb环境下mo基本功能的代码 如图层的加载

VERSION 5.00
Object = "{9BD6A640-CE75-11D1-AF04-204C4F4F5020}#2.0#0"; "mo20.ocx"
Begin VB.Form Form06 
   Caption         =   "墨西哥地图"
   ClientHeight    =   9600
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   11445
   LinkTopic       =   "Form1"
   ScaleHeight     =   9600
   ScaleWidth      =   11445
   StartUpPosition =   2  '屏幕中心
   Begin MapObjects2.Map Map1 
      Height          =   9375
      Left            =   120
      TabIndex        =   0
      Top             =   120
      Width           =   11175
      _Version        =   131072
      _ExtentX        =   19711
      _ExtentY        =   16536
      _StockProps     =   225
      BackColor       =   16777215
      BorderStyle     =   1
      Contents        =   "Form06.frx":0000
   End
End
Attribute VB_Name = "Form06"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
'Xue Wei,2003/5/13
'用ListView添加属性窗口；
'用一个Combo控件来区分不同的对象。在Combo中选择一个对象后，这个对象就闪烁，然后显示其属性；
'还可以显示对象类型和位置；
'调用一个Form并变换显示位置；

Option Explicit

Dim zbx1 As Integer, zbx2 As Integer, zby1 As Integer, zby2 As Integer
Dim Xmid As Long, Ymid As Long

Private Sub Map1_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
    Dim p As MapObjects2.Point
    Dim ly1 As MapObjects2.MapLayer
   
    Set p = Map1.ToMapPoint(X, Y)
    If p.X < Xmid Then               '判断位置，分别放在4个角上；
      frmIdentify.Left = zbx2
    Else
      frmIdentify.Left = zbx1
    End If
    If p.Y < Ymid Then
      frmIdentify.Top = zby2
    Else
      frmIdentify.Top = zby1
    End If
    
    Call frmIdentify.Identify(X, Y)
    frmIdentify.ZOrder 0
End Sub

Sub DrawLayer()
  Dim dc As New DataConnection
  Dim layer As MapLayer
  dc.Database = App.Path + "\..\" + "Mexico"
  If Not dc.Connect Then
    MsgBox "在指定的文件夹下没找到图层数据文件！"
    End
  End If
  
  Set layer = New MapLayer
  Set layer.GeoDataset = dc.FindGeoDataset("States")
  layer.Symbol.Color = moYellow
  Map1.Layers.Add layer
  
  Set layer = New MapLayer
  Set layer.GeoDataset = dc.FindGeoDataset("Rivers")
  layer.Symbol.Color = moRed
  Map1.Layers.Add layer
  Map1.Refresh
  
  Set layer = New MapLayer
  Set layer.GeoDataset = dc.FindGeoDataset("Cities")
  layer.Symbol.Color = moBlue
  Map1.Layers.Add layer
End Sub

Private Sub Form_Load()
  DrawLayer
  zbx1 = 200
  zbx2 = Map1.Width
  zby1 = 200
  zby2 = Int(Map1.Height / 2) + 1000
  Xmid = Map1.Extent.Left + Int(Map1.Extent.Width / 2)
  Ymid = Map1.Extent.Top - Int(Map1.Extent.Height / 2)
End Sub

Private Sub Form_Unload(Cancel As Integer)
  Unload frmIdentify
End Sub