form04.frm

一个关于基于MO编程的参考资料希望对大家的交流和学习有帮助

VERSION 5.00
Object = "{9BD6A640-CE75-11D1-AF04-204C4F4F5020}#2.0#0"; "mo20.ocx"
Begin VB.Form Form04 
   Caption         =   "画线"
   ClientHeight    =   3885
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   4350
   LinkTopic       =   "Form1"
   ScaleHeight     =   3885
   ScaleWidth      =   4350
   StartUpPosition =   2  '屏幕中心
   Begin VB.CommandButton Command1 
      Caption         =   "清除"
      Height          =   495
      Left            =   1320
      TabIndex        =   1
      Top             =   3360
      Width           =   1335
   End
   Begin MapObjects2.Map Map1 
      Height          =   3255
      Left            =   0
      TabIndex        =   0
      Top             =   0
      Width           =   4335
      _Version        =   131072
      _ExtentX        =   7646
      _ExtentY        =   5741
      _StockProps     =   225
      BackColor       =   16777215
      BorderStyle     =   1
      Contents        =   "form04.frx":0000
   End
End
Attribute VB_Name = "Form04"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
'Xuewei,2003/5/7
'在图上画点后，连成线。点击Command1清除。
Option Explicit

Dim g_Line As MapObjects2.Line
Dim Pts As MapObjects2.Points

Private Sub Command1_Click()
  Set g_Line = Nothing
  Set Pts = Nothing
  Map1.Refresh
  Set g_Line = New MapObjects2.Line
End Sub

Private Sub Map1_AfterTrackingLayerDraw(ByVal hDC As stdole.OLE_HANDLE)
  Dim sym As New Symbol
  If Not g_Line Is Nothing Then
    sym.Color = moBlack
    Map1.DrawShape Pts, sym
    If Pts.Count > 1 Then
      sym.Color = moRed
      Map1.DrawShape g_Line, sym
    End If
  End If
End Sub

Private Sub Map1_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
  Dim p As Point
  If Button = 1 Then
    If g_Line Is Nothing Then
      Set g_Line = New MapObjects2.Line
    End If
    
    If Pts Is Nothing Then
      Set Pts = New MapObjects2.Points
    End If
    
    Set p = Map1.ToMapPoint(X, Y)
    Pts.Add p
    If Pts.Count = 1 Then
        g_Line.Parts.Add Pts
        Set Pts = g_Line.Parts(0)
    End If
    Map1.TrackingLayer.Refresh True
  Else
    MsgBox "right"
  End If
End Sub