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         =   "世界地图"
   ClientHeight    =   4590
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   7260
   LinkTopic       =   "Form1"
   ScaleHeight     =   4590
   ScaleWidth      =   7260
   StartUpPosition =   2  '屏幕中心
   Begin MapObjects2.Map Map1 
      Height          =   3735
      Left            =   0
      TabIndex        =   0
      Top             =   120
      Width           =   7215
      _Version        =   131072
      _ExtentX        =   12726
      _ExtentY        =   6588
      _StockProps     =   225
      BackColor       =   16777215
      BorderStyle     =   1
      Contents        =   "Form06.frx":0000
   End
   Begin VB.Label Label1 
      Caption         =   "Label1"
      Height          =   255
      Left            =   1800
      TabIndex        =   1
      Top             =   4080
      Width           =   4215
   End
End
Attribute VB_Name = "Form06"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
'Xuewei,2003/6/10
'ToMapDistance和ToMapPoint练习；
'在世界地图上显示点击处坐标（公里）；

Option Explicit

Dim Dx As Single

Private Sub Form_Load()
  Dx = 40075.7 / 360
  Label1.Caption = "点击地图显示公里。"
  DrawLayer     '加载世界地图；
End Sub

Private Sub Map1_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
  Dim Str1 As String
  Str1 = "x=" & Format(Map1.ToMapDistance(X) * Dx, "0.000") & "，y=" & Format(Map1.ToMapDistance(Y) * Dx, "0.000")
  Label1.Caption = Str1
End Sub

Sub DrawLayer()
  Dim dc As New DataConnection
  Dim layer As MapLayer
  
  dc.Database = App.Path + "\..\" + "world"
  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("country")
  layer.Symbol.Color = moRed
  Map1.Layers.Add layer
  
  Set layer = New MapLayer
  Set layer.GeoDataset = dc.FindGeoDataset("latlon")
  layer.Symbol.Color = moDarkGreen
  Map1.Layers.Add layer
End Sub