使用ArcGIS Engine来实现地图的点击查询并闪烁

最新推荐文章于 2021-09-16 17:55:13 发布

转载最新推荐文章于 2021-09-16 17:55:13 发布 · 1.6k 阅读

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本文介绍如何在ArcGIS Engine中实现MapControl点击查询功能，并通过闪烁效果高亮显示查询结果。文中提供了具体的VB.NET代码示例，包括设置地图环境、识别图层元素及消息提示等关键步骤。

ArcGIS Engine没有提供在MapControl中点击查询的命令，只是提供了ReaderControl中的使用的点击查询的命令，下面的代码就是实现点击查询并闪烁的代码。
过程描述
Private Sub MapControl1_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 pMap As IMap

Dim i As Integer
Dim pPoint As IPoint
Set pMap = MapControl1.Map
Set pPoint = MapControl1.ActiveView.ScreenDisplay.DisplayTransformation.ToMapPoint(x, y)

Dim pIdentify As IIdentify

Dim pIDArray As IArray
Dim pFeatIdObj As IFeatureIdentifyObj
Dim pIdObj As IIdentifyObj
Set pIdentify = pMap.Layer(1)

Dim pEnv As IEnvelope
Set pEnv = New Envelope
Set pEnv = MapControl1.ActiveView.Extent
pEnv.Height = 100
pEnv.Width = 100
pEnv.CenterAt pPoint

Set pIDArray = pIdentify.Identify(pEnv)

If Not pIDArray Is Nothing Then
Set pFeatIdObj = pIDArray.Element(0)
Set pIdObj = pFeatIdObj
pIdObj.Flash MapControl1.ActiveView.ScreenDisplay
'消息显示查询目标的信息
MsgBox "Layer:" & pIdObj.Layer.Name & vbNewLine & "Feature:" & pIdObj.Name
Else
MsgBox "No feature identified."
End If
End Sub