form04a.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 Form04a 
   Caption         =   "墨西哥地图"
   ClientHeight    =   6405
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   8310
   LinkTopic       =   "Form2"
   ScaleHeight     =   6405
   ScaleWidth      =   8310
   StartUpPosition =   1  '所有者中心
   Begin VB.CommandButton Command1 
      Caption         =   "Command1"
      Height          =   495
      Left            =   3720
      TabIndex        =   1
      Top             =   5880
      Width           =   1215
   End
   Begin MapObjects2.Map Map1 
      Height          =   5655
      Left            =   120
      TabIndex        =   0
      Top             =   120
      Width           =   8055
      _Version        =   131072
      _ExtentX        =   14208
      _ExtentY        =   9975
      _StockProps     =   225
      BackColor       =   16777215
      BorderStyle     =   1
      Contents        =   "Form04a.frx":0000
   End
End
Attribute VB_Name = "Form04a"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
'Xuewei,2003/6/4
'MoveTo练习；

Option Explicit

Private 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 = moPaleYellow
  Map1.Layers.Add layer
  
  Set layer = New MapLayer
  Set layer.GeoDataset = dc.FindGeoDataset("Rivers")
  layer.Symbol.Color = moDarkGreen
  Map1.Layers.Add layer
End Sub

Private Sub Command1_Click()
  With Map1.TrackingLayer
    If .EventCount > 0 Then
      .Event(.EventCount - 1).MoveTo Map1.Extent.Center.x, Map1.Extent.Center.y
    End If
  End With
  Command1.Enabled = False
End Sub

Private Sub Form_Load()
  DrawLayer
  Command1.Enabled = False
  Command1.Caption = "Move to Center"
End Sub

Private Sub Map1_MouseDown(Button As Integer, Shift As Integer, x As Single, y As Single)
  Dim oPoint As MapObjects2.Point

  
  Set oPoint = Map1.ToMapPoint(x, y)
  Map1.TrackingLayer.AddEvent oPoint, 0
  
  Command1.Enabled = True

End Sub