GPS学堂 VB+mapx实现各种专题图的示例-GPSUU-GPS之家

Private Sub Command5_Click()
'创建专题图层

    Dim oDs As MapXLib.Dataset
    Dim oLayer As MapXLib.Layer
    Dim oTheme As MapXLib.Theme
    Dim oFields As New MapXLib.Fields
    Dim oField As MapXLib.Field
    Dim oCoordSys As MapXLib.CoordSys

    Dim strLayerName As String
    Dim nType As Integer

    Dim s As Integer

'改变投影系
    Set oCoordSys = Map1.DisplayCoordSys.Clone
    SetCoordsys

'设置专题图层
    strLayerName = GetThemeLayerName()
    If strLayerName = Then
        MsgBox 请选择绑定图层
        Exit Sub
    End If

'设置专题绑定数据集
    Set oLayer = Map1.Layers.Item(strLayerName)
    Map1.DataSets.RemoveAll
    Set oDs = Map1.DataSets.Add(miDataSetLayer, oLayer, oLayer.KeyField)

'获得专题图类型
    nType = GetThemeType
    If nType = -1 Or nType = 9 Then
        MsgBox 请选择专题类型
        Exit Sub
    End If

'设置专题图
    oFields.RemoveAll
    Set oField = oFields.Add(oDs.Fields.Item(2), data1

    oDs.Themes.RemoveAll
    If nType = 1 Or nType = 2 Then
        oFields.Add oDs.Fields.Item(3), data2

        Set oTheme = oDs.Themes.Add(nType, oFields)
    ElseIf nType = 9 Then
        'Set oTheme = oDs.Themes.Add(nType)
    Else
        Set oTheme = oDs.Themes.Add(nType, oField)
    End If



'还原投影系

    Set Map1.DisplayCoordSys = oCoordSys
    'Set Map1.NumericCoordSys = oCoordSys
    Set Map1.NumericCoordSys = Map1.DisplayCoordSys

End Sub
Sub SetCoordsys()
'设置投影系
    Dim oDatum As New MapXLib.Datum

    oDatum.Set 0, 0, 0, 0, 0, 0, 0, 0, 0
    Map1.DisplayCoordSys.Set miLongLat, oDatum, miUnitDegree
    Set Map1.NumericCoordSys = Map1.DisplayCoordSys

End Sub
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GPS学堂 VB+mapx实现各种专题图的示例