form08a.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 = "{8F107D7F-9138-474F-92AE-F116050B0D64}#1.0#0"; "scalebar.ocx"
Begin VB.Form Form08a 
   Caption         =   "墨西哥地图"
   ClientHeight    =   5295
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   8115
   LinkTopic       =   "Form1"
   ScaleHeight     =   5295
   ScaleWidth      =   8115
   StartUpPosition =   2  '屏幕中心
   Begin MSComctlLib.StatusBar StatusBar1 
      Align           =   2  'Align Bottom
      Height          =   495
      Left            =   0
      TabIndex        =   3
      Top             =   4800
      Width           =   8115
      _ExtentX        =   14314
      _ExtentY        =   873
      _Version        =   393216
      BeginProperty Panels {8E3867A5-8586-11D1-B16A-00C0F0283628} 
         NumPanels       =   4
         BeginProperty Panel1 {8E3867AB-8586-11D1-B16A-00C0F0283628} 
            Object.Width           =   3528
            MinWidth        =   3528
         EndProperty
         BeginProperty Panel2 {8E3867AB-8586-11D1-B16A-00C0F0283628} 
            Object.Width           =   3881
            MinWidth        =   3881
         EndProperty
         BeginProperty Panel3 {8E3867AB-8586-11D1-B16A-00C0F0283628} 
            Object.Width           =   3881
            MinWidth        =   3881
         EndProperty
         BeginProperty Panel4 {8E3867AB-8586-11D1-B16A-00C0F0283628} 
            Object.Width           =   3528
            MinWidth        =   3528
         EndProperty
      EndProperty
   End
   Begin ScaleBar.sbScaleBar sbScaleBar1 
      Height          =   735
      Left            =   0
      TabIndex        =   2
      Top             =   3840
      Width           =   2175
      _ExtentX        =   3836
      _ExtentY        =   1296
      BackColor       =   -2147483633
      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
      MapUnits        =   2
      ScaleBarUnits   =   3
      ScreenUnits     =   1
   End
   Begin VB.Frame Frame1 
      Caption         =   "Frame1"
      Height          =   3375
      Left            =   240
      TabIndex        =   1
      Top             =   120
      Width           =   1695
   End
   Begin MapObjects2.Map Map1 
      Height          =   4455
      Left            =   2280
      TabIndex        =   0
      Top             =   120
      Width           =   5775
      _Version        =   131072
      _ExtentX        =   10186
      _ExtentY        =   7858
      _StockProps     =   225
      BackColor       =   16777215
      BorderStyle     =   1
      Contents        =   "Form08a.frx":0000
   End
End
Attribute VB_Name = "Form08a"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
'Xue Wei,2003/7/20
'改变比例显示；

Option Explicit
Const Mx = 10000
Const My = 10000

Private Sub refreshScale()
 
 sbScaleBar1.MapExtent.MaxX = Map1.Extent.Right * Mx
 sbScaleBar1.MapExtent.MinX = Map1.Extent.Left * Mx
 sbScaleBar1.MapExtent.MaxY = Map1.Extent.Bottom * My
 sbScaleBar1.MapExtent.MinY = Map1.Extent.Top * My
   
 sbScaleBar1.PageExtent.MinX = Map1.Left / Screen.TwipsPerPixelX
 sbScaleBar1.PageExtent.MinY = Map1.Top / Screen.TwipsPerPixelY
 sbScaleBar1.PageExtent.MaxX = (Map1.Left + Map1.Width) / Screen.TwipsPerPixelX
 sbScaleBar1.PageExtent.MaxY = (Map1.Top + Map1.Height) / Screen.TwipsPerPixelY
 
 sbScaleBar1.Refresh
 StatusBar1.Panels(1).text = "比例  1 : " & Format$(sbScaleBar1.RFScale, "###,###,###,###,###")
End Sub

Private Sub Map1_MouseMove(Button As Integer, Shift As Integer, x As Single, y As Single)
  Dim pt As New MapObjects2.Point
  Set pt = Map1.ToMapPoint(x, y)
  StatusBar1.Panels(2).text = " x= " & pt.x
  StatusBar1.Panels(3).text = " y= " & pt.y
  'm_mapTip.MouseMove x, y      'TIPTEXT程序用
End Sub

Private Sub Map2_MouseMove(Button As Integer, Shift As Integer, x As Single, y As Single)
  Dim pt As New MapObjects2.Point
  Set pt = Map1.ToMapPoint(x, y)
  StatusBar1.Panels(2).text = " x= " & pt.x
  StatusBar1.Panels(3).text = " y= " & pt.y
End Sub

Private Sub Map1_MouseDown(Button As Integer, Shift As Integer, x As Single, y As Single)
  If Button = vbLeftButton Then
    Set Map1.Extent = Map1.TrackRectangle
  ElseIf Button = vbRightButton Then
    Map1.Pan
  End If
End Sub

Private Sub Map1_AfterLayerDraw(ByVal Index As Integer, ByVal canceled As Boolean, ByVal hdc As stdole.OLE_HANDLE)
  Call refreshScale
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
End Sub