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         =   "Mesure"
   ClientHeight    =   4905
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   5100
   LinkTopic       =   "Form1"
   ScaleHeight     =   4905
   ScaleWidth      =   5100
   StartUpPosition =   2  '屏幕中心
   Begin VB.CommandButton Command1 
      Caption         =   "开始"
      Height          =   495
      Left            =   1800
      TabIndex        =   2
      Top             =   4320
      Width           =   1335
   End
   Begin VB.ListBox List1 
      Height          =   960
      Left            =   480
      TabIndex        =   1
      Top             =   3240
      Width           =   3855
   End
   Begin MapObjects2.Map Map1 
      Height          =   2895
      Left            =   120
      TabIndex        =   0
      Top             =   120
      Width           =   4815
      _Version        =   131072
      _ExtentX        =   8493
      _ExtentY        =   5106
      _StockProps     =   225
      BackColor       =   16777215
      BorderStyle     =   1
      Contents        =   "Form06.frx":0000
   End
End
Attribute VB_Name = "Form06"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
'Xue Wei,2003/6/1
'Measures练习；
'从MO的帮助中修改而来。
Option Explicit
Dim Line1 As New MapObjects2.Line

Private Sub Command1_Click()
  Dim P1 As Point
  Dim Pts As MapObjects2.Points
  
   Set Line1 = New MapObjects2.Line
  Set Pts = New MapObjects2.Points
  Set P1 = Map1.ToMapPoint(100, 100)
  Pts.Add P1
  Set P1 = Map1.ToMapPoint(4500, 2500)
  Pts.Add P1
 
  Set P1 = Map1.ToMapPoint(500, 1500)
  Pts.Add P1
  Line1.Parts.Add Pts
  Set Pts = Line1.Parts(0)
  
  outputMeasures Line1
  Map1.Refresh
End Sub

Private Sub Form_Load()
  List1.AddItem "单击“开始”"
End Sub

Private Sub Map1_AfterTrackingLayerDraw(ByVal hDC As stdole.OLE_HANDLE)
  Dim sym As New Symbol
  sym.Color = moRed
  sym.SymbolType = moLineSymbol
  sym.Size = 5
  If Not Line1 Is Nothing Then
    Map1.DrawShape Line1, sym
  End If
End Sub
  
Private Sub outputMeasures(aLine As MapObjects2.Line)
  Dim pCount As Integer
  Dim itemCount As Integer
  
  Dim partLine As MapObjects2.Points
  Dim i As Integer
  
  For Each partLine In aLine.Parts
    pCount = pCount + 1
    For i = 0 To partLine.Count - 1 Step 1
      itemCount = itemCount + 1
      With partLine.Item(i)
        .Measure = 10 * i
        List1.AddItem "点" & itemCount & vbTab & "X＝" & _
        Format(.x, "0.00") & vbTab & "Y＝" & Format(.y, "0.00") & vbTab & "M＝" & .Measure
      End With
    Next i
  Next partLine
End Sub