IFeatureIdentifyObj实现闪烁功能

从GIS浩淼的天空看到的一篇用IFeatureIdentifyObj实现闪烁功能，不过这方法AE不支持。

Dim pEnvs As IEnvelope
pEnvs = AxMapControl1.TrackRectangle

Dim pLayer As IFeatureLayer
pLayer = pMainMap.Layer(0)
Dim pIdentify As IIdentify
pIdentify = pLayer
Dim pArr As IArray
pArr = pIdentify.Identify(pEnvs)

Dim pFtIdenObj As IFeatureIdentifyObj
Dim pIdenObj As IIdentifyObj
If Not pArr Is Nothing Then
Dim j As Integer
For j = 0 To pArr.Count - 1
        pFtIdenObj = pArr.Element(j)
        pIdenObj = pFtIdenObj
        pIdenObj.Flash(pMainAV.ScreenDisplay)
        pIdenObj = Nothing
        pFtIdenObj = Nothing
Next
End If

 

要在AE实现闪烁功能，一个方法是用IHookActions.DoActions()方法搭上esriHookActionsFlash作为动作。

IHookActions的定义如下  

[Visual Basic 6.0]
Sub DoAction()Sub DoAction(    
    ByVal pUnknown As Unknown, 
    ByVal Action As esriHookActions  
)

[Visual Basic .NET]
Public Sub DoAction()Sub DoAction ( _
    ByVal pUnknown As Object, _
    ByVal Action As esriHookActions _
)

 

pUnknown必须是实现了IEnvelope, IPoint, IPolygon 或者 IPolyline 的geometry对象，

而且该geometry不应该为空。

Action方面有6个constant，可以根据需要选择.

Constant	Value	Description
esriHookActionsFlash	0	Flash the geometry.
esriHookActionsPan	1	Pan to the geometry.
esriHookActionsZoom	2	Zoom to the geometry.
esriHookActionsGraphic	3	Create a graphic for the geometry.
esriHookActionsLabel	4	Create a graphic and label for the geometry.
esriHookActionsCallout	5	Create a callout for the geometry.

 

 完成闪烁的代码如下：

Dim hookActions as IHookActions
hookActions.DoAction(feature.Shape, esriHookActions.esriHookActionsPan)

　Application.DoEvent();
hookActions.DoAction(feature.Shape,esriHookActions.esriHookActionsFlash)