form03.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 Form03 
   Caption         =   "墨西哥地图"
   ClientHeight    =   5355
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   6765
   LinkTopic       =   "Form1"
   ScaleHeight     =   5355
   ScaleWidth      =   6765
   StartUpPosition =   2  '屏幕中心
   Begin VB.CommandButton Command1 
      Caption         =   "Command1"
      Height          =   495
      Left            =   2640
      TabIndex        =   1
      Top             =   4680
      Width           =   1215
   End
   Begin MapObjects2.Map Map1 
      Height          =   4575
      Left            =   0
      TabIndex        =   0
      Top             =   0
      Width           =   6735
      _Version        =   131072
      _ExtentX        =   11880
      _ExtentY        =   8070
      _StockProps     =   225
      BackColor       =   16777215
      BorderStyle     =   1
      Contents        =   "Form03.frx":0000
   End
End
Attribute VB_Name = "Form03"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
'Xue Wei,2003/6/6
'使用LevelField属性；

Option Explicit

Private Sub Command1_Click()
  Dim oRenderer As New MapObjects2.LabelRenderer
  Map1.Layers(0).Renderer = oRenderer
  With oRenderer
    .Field = "NAME"
    .LevelField = "CITIES_"
    .MinLevel = 8
    .MaxLevel = 13
  End With
  Map1.Refresh
End Sub

Private Sub Form_Load()
  DrawLayer
End Sub

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 = moOrange
  layer.Symbol.Size = 1
  layer.Symbol.Style = 2
  layer.Symbol.OutlineColor = moBrown
  
  Map1.Layers.Add layer
  
  Set layer = New MapLayer
  Set layer.GeoDataset = dc.FindGeoDataset("Rivers")
  layer.Symbol.Color = moDarkGreen
  layer.Symbol.Size = 2
  Map1.Layers.Add layer
  
  Set layer = New MapLayer
  Set layer.GeoDataset = dc.FindGeoDataset("Cities")
  layer.Symbol.Color = moRed
  layer.Symbol.Size = 3
  Map1.Layers.Add layer
  Map1.Refresh
End Sub