form1.frm

地理信息系统利用MO简单开发的一个功能

VERSION 5.00
Object = "{9BD6A640-CE75-11D1-AF04-204C4F4F5020}#2.0#0"; "Mo20.ocx"
Begin VB.Form Form1 
   Caption         =   "Form1"
   ClientHeight    =   5580
   ClientLeft      =   60
   ClientTop       =   450
   ClientWidth     =   7665
   LinkTopic       =   "Form1"
   ScaleHeight     =   5580
   ScaleWidth      =   7665
   StartUpPosition =   3  '窗口缺省
   Begin MapObjects2.Map Map2 
      Height          =   1575
      Left            =   120
      TabIndex        =   1
      Top             =   3360
      Width           =   1815
      _Version        =   131072
      _ExtentX        =   3201
      _ExtentY        =   2778
      _StockProps     =   225
      BackColor       =   16777215
      BorderStyle     =   1
      Contents        =   "Form1.frx":0000
   End
   Begin MapObjects2.Map Map1 
      Height          =   3975
      Left            =   2280
      TabIndex        =   0
      Top             =   960
      Width           =   4575
      _Version        =   131072
      _ExtentX        =   8070
      _ExtentY        =   7011
      _StockProps     =   225
      BackColor       =   16777215
      BorderStyle     =   1
      Contents        =   "Form1.frx":001A
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Private Sub Form_Load()
Dim layer As MapLayer
Dim dc As New DataConnection
dc.Database = App.Path

Set layer = New MapLayer
Set layer.GeoDataset = dc.FindGeoDataset("states")
layer.Symbol.Color = moYellow
layer.Symbol.Size = 1
layer.Symbol.OutlineColor = moBrown
layer.Symbol.SymbolType = moLineSymbol
layer.Name = "行政区"
Map1.Layers.Add layer

Set layer = New MapLayer
Set layer.GeoDataset = dc.FindGeoDataset("rivers")
layer.Symbol.Size = 2
layer.Symbol.Color = moDarkGreen
layer.Name = "河流"

Set layer = New MapLayer
Set layer.GeoDataset = dc.FindGeoDataset("cities")
layer.Symbol.Size = 3
layer.Symbol.Color = moRed
layer.Symbol.Style = 0
layer.Name = "城市"

Set layer = New MapLayer
layer.Name = "城市名称"
layer.Symbol.Size = 0
Set layer.Renderer = New LabelRenderer
layer.Renderer.Field = "NAME "
layer.Renderer.Symbol(0).Font.Name = "幼圆"
layer.Renderer.Symbol(0).Color = moBlack
layer.Renderer.Symbol(0).Font.Size = 9
layer.Renderer.AllowDuplicates = True
Map1.Layers.Add layer
Map1.Refresh

Set layer = New MapLayer
Set layer.GeoDataset = dc.FindGeoDataset("states")
layer.Symbol.Color = moPaleYellow
Map2.Layers.Add layer
Map2.Refresh
End Sub

Private Sub Map1_AfterLayerDraw(ByVal index As Integer, ByVal canceled As Boolean, ByVal hDC As stdole.OLE_HANDLE)
If index = 0 Then
Map2.TrackingLayer.Refresh True
End If
End Sub

Private Sub Map1_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
Dim r As MapObjects2.Rectangle
If Button = vbLeftButton Then
Set Map1.Extent = Map1.TrackRectangle
ElseIf Button = vbRightButton Then
Set r = Map1.Extent
r.ScaleRectangle 1.5
Map1.Extent = r
End If
End Sub

Private Sub Map2_AfterTrackingLayerDraw(ByVal hDC As stdole.OLE_HANDLE)
Dim sym As New Symbol
sym.OutlineColor = moRed
sym.Size = 2
sym.Style = moTransparentFill
Map2.DrawShape Map1.Extent, sym
End Sub


Private Sub Map2_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
Dim curRectangle As MapObjects2.Rectangle
Dim pt As New MapObjects2.Point
Set curRectangle = Map2.TrackRectangle
Set Map1.Extent = curRectangle
Set pt = Map2.ToMapPoint(X, Y)
Map1.CenterAt pt.X, pt.Y
End Sub