form08.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"
Object = "{831FDD16-0C5C-11D2-A9FC-0000F8754DA1}#2.0#0"; "MSCOMCTL.OCX"
Object = "{C7FC2F7C-0688-11D5-B2F8-000102D87123}#1.0#0"; "mo21legend.ocx"
Begin VB.Form Form08 
   Caption         =   "墨西哥地图浏览系统"
   ClientHeight    =   7800
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   10560
   LinkTopic       =   "Form1"
   ScaleHeight     =   7800
   ScaleWidth      =   10560
   StartUpPosition =   2  '屏幕中心
   Begin MO21legend.legend legend1 
      Height          =   4935
      Left            =   120
      TabIndex        =   4
      Top             =   600
      Width           =   1095
      _ExtentX        =   1931
      _ExtentY        =   8705
      BackColor       =   -2147483644
      ForeColor       =   -2147483630
      BeginProperty Font {0BE35203-8F91-11CE-9DE3-00AA004BB851} 
         Name            =   "MS Sans Serif"
         Size            =   8.25
         Charset         =   0
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
   End
   Begin VB.CommandButton Command1 
      Caption         =   "退出"
      Height          =   375
      Left            =   120
      TabIndex        =   3
      Top             =   6720
      Width           =   975
   End
   Begin VB.CommandButton Command3 
      Caption         =   "帮助"
      Height          =   375
      Left            =   120
      TabIndex        =   2
      Top             =   5880
      Width           =   975
   End
   Begin MSComctlLib.ImageList ImageList1 
      Left            =   9240
      Top             =   0
      _ExtentX        =   1005
      _ExtentY        =   1005
      BackColor       =   -2147483643
      ImageWidth      =   20
      ImageHeight     =   20
      MaskColor       =   12632256
      _Version        =   393216
      BeginProperty Images {2C247F25-8591-11D1-B16A-00C0F0283628} 
         NumListImages   =   4
         BeginProperty ListImage1 {2C247F27-8591-11D1-B16A-00C0F0283628} 
            Picture         =   "Form08.frx":0000
            Key             =   ""
         EndProperty
         BeginProperty ListImage2 {2C247F27-8591-11D1-B16A-00C0F0283628} 
            Picture         =   "Form08.frx":0112
            Key             =   ""
         EndProperty
         BeginProperty ListImage3 {2C247F27-8591-11D1-B16A-00C0F0283628} 
            Picture         =   "Form08.frx":0224
            Key             =   ""
         EndProperty
         BeginProperty ListImage4 {2C247F27-8591-11D1-B16A-00C0F0283628} 
            Picture         =   "Form08.frx":0336
            Key             =   ""
         EndProperty
      EndProperty
   End
   Begin MSComctlLib.Toolbar Toolbar1 
      Align           =   1  'Align Top
      Height          =   480
      Left            =   0
      TabIndex        =   1
      Top             =   0
      Width           =   10560
      _ExtentX        =   18627
      _ExtentY        =   847
      ButtonWidth     =   714
      ButtonHeight    =   688
      Appearance      =   1
      ImageList       =   "ImageList1"
      _Version        =   393216
      BeginProperty Buttons {66833FE8-8583-11D1-B16A-00C0F0283628} 
         NumButtons      =   9
         BeginProperty Button1 {66833FEA-8583-11D1-B16A-00C0F0283628} 
            Object.ToolTipText     =   "放大"
            ImageIndex      =   1
            Style           =   2
         EndProperty
         BeginProperty Button2 {66833FEA-8583-11D1-B16A-00C0F0283628} 
            Object.ToolTipText     =   "缩小"
            ImageIndex      =   2
            Style           =   2
         EndProperty
         BeginProperty Button3 {66833FEA-8583-11D1-B16A-00C0F0283628} 
            Object.ToolTipText     =   "移动"
            ImageIndex      =   3
            Style           =   2
         EndProperty
         BeginProperty Button4 {66833FEA-8583-11D1-B16A-00C0F0283628} 
            Object.ToolTipText     =   "还原"
            ImageIndex      =   4
            Style           =   2
         EndProperty
         BeginProperty Button5 {66833FEA-8583-11D1-B16A-00C0F0283628} 
         EndProperty
         BeginProperty Button6 {66833FEA-8583-11D1-B16A-00C0F0283628} 
         EndProperty
         BeginProperty Button7 {66833FEA-8583-11D1-B16A-00C0F0283628} 
         EndProperty
         BeginProperty Button8 {66833FEA-8583-11D1-B16A-00C0F0283628} 
         EndProperty
         BeginProperty Button9 {66833FEA-8583-11D1-B16A-00C0F0283628} 
         EndProperty
      EndProperty
      OLEDropMode     =   1
   End
   Begin MapObjects2.Map Map1 
      Height          =   7095
      Left            =   1320
      TabIndex        =   0
      Top             =   600
      Width           =   9255
      _Version        =   131072
      _ExtentX        =   16325
      _ExtentY        =   12515
      _StockProps     =   225
      BackColor       =   16777215
      BorderStyle     =   1
      Contents        =   "Form08.frx":0448
   End
End
Attribute VB_Name = "Form08"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
'Xue Wei,2003/5/3
'第2章和第3章的综合例子（MO基本功能设置）

Option Explicit
Dim dc As New DataConnection
Dim layer As MapLayer
Dim r As MapObjects2.Rectangle

Private Sub Command1_Click()
  End
End Sub

Private Sub Command3_Click()
  Dim Bs As String
  Bs = "选择工具栏，可以实现放大、缩小、移动和还原的功能。" & vbCrLf & _
  "点击左边的图例控制面板，可以打开和关闭图层。" & vbCrLf & vbCrLf & "       Xue Wei,2003/5/3"
  MsgBox Bs, , "墨西哥地图浏览系统帮助"
End Sub

Private Sub Map1_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
  If Toolbar1.Buttons(1).Value = 1 Then
    Set Map1.Extent = Map1.TrackRectangle
  ElseIf Toolbar1.Buttons(3).Value = 1 Then
    Map1.Pan
  ElseIf Toolbar1.Buttons(2).Value = 1 Then
    Set r = Map1.Extent
    r.ScaleRectangle 1.5
    Map1.Extent = r
  End If
End Sub

Private Sub Toolbar1_ButtonClick(ByVal Button As MSComctlLib.Button)
  If Toolbar1.Buttons(1).Value = 1 Then
    Map1.MousePointer = moZoomIn
  ElseIf Toolbar1.Buttons(3).Value = 1 Then
    Map1.MousePointer = moPan
  ElseIf Toolbar1.Buttons(2).Value = 1 Then
    Map1.MousePointer = moZoomOut
  ElseIf Toolbar1.Buttons(4).Value = 1 Then
    Set Map1.Extent = Map1.FullExtent
    Map1.MousePointer = moDefault
  End If
End Sub

Private Sub legend1_AfterSetLayerVisible(index As Integer, isVisible As Boolean)
  Map1.Refresh
End Sub

Private Sub LayerSet()
  Dim Sline As Object
  Set layer = New MapLayer
  Set layer.GeoDataset = dc.FindGeoDataset("States")
  
  layer.Symbol.Color = moYellow
  layer.Symbol.SymbolType = moLineSymbol
  layer.Symbol.Size = 1
  layer.Symbol.OutlineColor = moBrown
  layer.Name = "行政区"
  Map1.Layers.Add layer
  
  Set layer = New MapLayer
  Set layer.GeoDataset = dc.FindGeoDataset("Lakes")
  layer.Symbol.Color = moNavy
  layer.Name = "湖泊"
  Map1.Layers.Add layer
  
  Set layer = New MapLayer
  Set layer.GeoDataset = dc.FindGeoDataset("Roads")
  layer.Symbol.Color = moRed
  layer.Symbol.Size = 1
  layer.Symbol.Style = 0
  layer.Name = "公路"
  Map1.Layers.Add layer
  
  Set layer = New MapLayer
  Set layer.GeoDataset = dc.FindGeoDataset("Rivers")
  layer.Symbol.Color = moDarkGreen
  layer.Symbol.Size = 2
  layer.Name = "河流"
  Map1.Layers.Add layer
  
  Set layer = New MapLayer
  Set layer.GeoDataset = dc.FindGeoDataset("Cities")
  layer.Name = "城市名称"
  layer.Symbol.Size = 0
  Set layer.Renderer = New LabelRenderer
  layer.Renderer.Field = "NAME"      '指定要显示的字段
  'layer.Renderer.Symbol(0).Font.Name = "幼圆"
  'layer.Renderer.Symbol(0).Font.Bold = False     '缺省为True
  layer.Renderer.Symbol(0).Color = moBlack
  layer.Renderer.Symbol(0).Font.Size = 9
  layer.Renderer.AllowDuplicates = True
  Map1.Layers.Add layer
  
  Set layer = New MapLayer
  Set layer.GeoDataset = dc.FindGeoDataset("Cities")
  layer.Symbol.Color = moRed
  layer.Symbol.Size = 3
  layer.Symbol.Style = 0
  layer.Name = "城市"
  Map1.Layers.Add layer
  
  
End Sub

Private Sub Form_Load()
  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
  LayerSet
  
  legend1.setMapSource Map1
  legend1.LoadLegend True
  Map1.Refresh
End Sub