Dim pMainMap As IMap
Dim pMainAV As IActiveView
Dim pOverMap As IMap
Dim pOverAV As IActiveView
Dim pOverGraCon As IGraphicsContainer
Dim pEnv As IEnvelope

Private Sub Form_Load()

Set pMainMap = MapControl1.Map
Set pMainAV = pMainMap
Set pOverMap = MapControl2.Map
Set pOverAV = pOverMap
Set pOverGraCon = pOverAV


pOverAV.Extent = MapControl2.FullExtent
pOverAV.PartialRefresh esriViewDrawPhase.esriViewGeography, Nothing, Nothing

End Sub

Private Sub MapControl1_OnAfterScreenDraw(ByVal hdc As Long)

'两个控件保持保持一致
Set pEnv = pMainAV.Extent

Dim pOverEle As IFillShapeElement
Set pOverEle = getEnvEle(pEnv)
pOverGraCon.DeleteAllElements
pOverGraCon.AddElement pOverEle, 0
'刷新鸟瞰控件视图
pOverAV.PartialRefresh esriViewDrawPhase.esriViewGeography, Nothing, Nothing


End Sub

Private Sub MapControl2_onMouseDown(ByVal button As Long, ByVal shift As Long, ByVal x As Long, ByVal y As Long, ByVal mapX As Double, ByVal mapY As Double)

Dim pPt As IPoint
Set pPt = New Point
pPt.PutCoords mapX, mapY

'改变主控件的视图范围
pEnv.CenterAt pPt
pMainAV.Extent = pEnv

pMainAV.PartialRefresh esriViewDrawPhase.esriViewGeography, Nothing, Nothing

End Sub
' 产生颜色的函数
Private Function getEnvEle(ByVal pEnv As IEnvelope) As IFillShapeElement
Dim pEle As IElement
Dim pFillShapeEle As IFillShapeElement
Set pFillShapeEle = New RectangleElement
Set pEle = pFillShapeEle

'颜色产生器
Dim pColor As IRgbColor
Set pColor = New RgbColor
pColor.Red = 255
pColor.Green = 0
pColor.Blue = 0
pColor.Transparency = 255

'线符号
Dim pLineSym As ISimpleLineSymbol
Set pLineSym = New SimpleLineSymbol
pLineSym.Color = pColor
pLineSym.Style = esriSimpleLineStyle.esriSLSSolid
pLineSym.Width = 1

'填充符号
Dim pFillSym As IFillSymbol
Set pFillSym = New SimpleFillSymbol
pColor.Transparency = 0
pFillSym.Color = pColor
pFillSym.Outline = pLineSym

pEle.Geometry = pEnv
pFillShapeEle.Symbol = pFillSym
Set getEnvEle = pFillShapeEle
'Return pFillShapeEle
End Function