form06.frm

VB＋M0开发GIS代码

VERSION 5.00
Object = "{9BD6A640-CE75-11D1-AF04-204C4F4F5020}#2.0#0"; "Mo20.ocx"
Begin VB.Form Form06 
   Caption         =   "通过选择图形对象查找相邻图形对象"
   ClientHeight    =   6480
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   7710
   LinkTopic       =   "Form1"
   ScaleHeight     =   6480
   ScaleWidth      =   7710
   StartUpPosition =   2  'CenterScreen
   Begin MapObjects2.Map Map1 
      Height          =   5415
      Left            =   120
      TabIndex        =   0
      Top             =   120
      Width           =   7455
      _Version        =   131072
      _ExtentX        =   13150
      _ExtentY        =   9551
      _StockProps     =   225
      BackColor       =   16777215
      BorderStyle     =   1
      Contents        =   "Form06.frx":0000
   End
   Begin VB.Label Label1 
      Caption         =   "Label1"
      Height          =   375
      Left            =   2280
      TabIndex        =   1
      Top             =   5880
      Width           =   2775
   End
End
Attribute VB_Name = "Form06"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
'Xue Wei,2003/5/17
'SearchShape练习；
'从MO的帮助中修改而来。

Option Explicit
Dim recset1 As MapObjects2.Recordset '点击的多边形；
Dim recset2 As MapObjects2.Recordset '邻近的多边形；

Private Sub Form_Load()
  DrawLayer
  Label1.Caption = "请点击地图"
End Sub

Private Sub Map1_AfterLayerDraw(ByVal index As Integer, ByVal canceled As Boolean, ByVal hDC As stdole.OLE_HANDLE)
  Call DrawSelection(recset2, moDarkGreen)
  Call DrawSelection(recset1, moMagenta)
  Set recset1 = Nothing
  Set recset2 = Nothing
End Sub

Private Sub Map1_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
  Dim pt As MapObjects2.Point
  Set pt = Map1.ToMapPoint(X, Y)
  Set recset1 = Map1.Layers(0).SearchShape(pt, moPointInPolygon, "")
  Set recset2 = Map1.Layers(0).SearchShape(recset1, moCommonPoint, "")
  If Not recset2 Is Nothing Then
    Label1.Caption = "一共找到" & recset2.Count - 1 & "个对象。"
  Else
    Label1.Caption = "没有找到对象。"
  End If
  Map1.Refresh
End Sub

Sub DrawSelection(recs As MapObjects2.Recordset, color)
  ' draw the features of a RecordSet
  Dim sym As New MapObjects2.Symbol
  sym.SymbolType = moFillSymbol
  sym.Style = moSolidFill
  sym.color = color
  If Not recs Is Nothing Then
    Map1.DrawShape recs, sym
  End If
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
  
End Sub