trouble migrating vba to .net for draw polygon buffers

Discussion created by benaller on Dec 7, 2011
Latest reply on Jun 14, 2012 by benaller

I'm new to .net and trying to adapt a version of the vba sample below to work as an add-in tool.

Here's the original:

I think I'm getting stuck on calling the mousedown and active view events.

Any help would be greatly appreciated.


'Draws 1/4 mile buffer on top most polygon layer. 
Option Explicit On

Imports ESRI.ArcGIS.esriSystem
Imports ESRI.ArcGIS.ArcMapUI
Imports ESRI.ArcGIS.Carto
Imports ESRI.ArcGIS.Geometry
Imports ESRI.ArcGIS.Display
Imports ESRI.ArcGIS.Geodatabase
Imports ESRI.ArcGIS.ArcCatalog

Public Class NitrateBufferTool

    Inherits ESRI.ArcGIS.Desktop.AddIns.Tool

    Private WithEvents ActiveViewEvents As Map

    Private m_pMxDoc As IMxDocument
    Private m_pBufferPolygon As IPolygon
    Private m_pLastBufferedExtent As IEnvelope
    Private m_pFillSymbol As ISimpleFillSymbol
    Private m_pOutlineSymbol As ISimpleLineSymbol

    Public Sub New()
    End Sub

    Protected Overrides Sub OnUpdate()

        Enabled = My.ArcMap.Application IsNot Nothing

    End Sub

    Private Sub ActiveViewEvents_AfterItemDraw(ByVal Index As Integer, ByVal display As IDisplay, ByVal phase As ESRI.ArcGIS.esriSystem.esriDrawPhase)
            'Only draw in the geography phase
            If Not phase = ESRI.ArcGIS.esriSystem.esriDrawPhase.esriDPGeography Then Exit Sub
            'Draw the buffered polygon
            If m_pBufferPolygon Is Nothing Then Exit Sub
            With display
            End With

    End Sub

    Private Sub ActiveViewEvents_SelectionChanged()

            Dim pActiveView As IActiveView
            Dim pEnumFeature As IEnumFeature
            Dim pFeature As IFeature
            Dim pPolygon As IPolygon
            Dim pTopoOperator As ITopologicalOperator
            Dim pGeometryBag As IGeometryCollection

            pActiveView = m_pMxDoc.FocusMap
            pGeometryBag = New GeometryBag

            'Flag last buffered region for invalidation
            If Not m_pLastBufferedExtent Is Nothing Then
                pActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography, Nothing, m_pLastBufferedExtent)
            End If

            If m_pMxDoc.FocusMap.SelectionCount = 0 Then
                'Nothing selected; don't draw anything; bail
                m_pBufferPolygon = Nothing
                Exit Sub
            End If

            'Buffer each selected feature
            pEnumFeature = m_pMxDoc.FocusMap.FeatureSelection
            pFeature = pEnumFeature.Next
            Do While Not pFeature Is Nothing
                pTopoOperator = pFeature.Shape
                pPolygon = pTopoOperator.Buffer(1320)
                'Get next feature
                pFeature = pEnumFeature.Next

            'Union all the buffers into one polygon
            m_pBufferPolygon = New Polygon
            pTopoOperator = m_pBufferPolygon 'QI

            m_pLastBufferedExtent = m_pBufferPolygon.Envelope

            'Flag new buffered region for invalidation
            pActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography, Nothing, m_pBufferPolygon.Envelope)

            'Zoom to the buffer extent
            Dim pEnvelope As IEnvelope
            pEnvelope = New Envelope
            pEnvelope.PutCoords(m_pBufferPolygon.Envelope.XMin - 1, m_pBufferPolygon.Envelope.YMin - 1, _
                              m_pBufferPolygon.Envelope.XMax + 1, m_pBufferPolygon.Envelope.YMax + 1)
            pEnvelope.Expand(1, 1, True)
            pActiveView.Extent = pEnvelope

    End Sub

    Private Sub OnMouseDown(ByVal button As Long, ByVal shift As Long, ByVal x As Long, ByVal y As Long)

        Dim pMxApp As IMxApplication
        Dim pMxDoc As IMxDocument
        Dim pMap As IMap
        Dim pActiveView As IActiveView
        Dim pEnvelope As IEnvelope
        Dim pRubberEnv As IRubberBand
        Dim MxStatusBar As IStatusBar
        Dim pProgAnim As IAnimationProgressor

        pRubberEnv = New RubberEnvelope
        pMxApp = My.ArcMap.Application
        pMxDoc = pMxApp.Document
        pMap = pMxDoc.FocusMap
        pActiveView = pMap
        pProgAnim = MxStatusBar.ProgressAnimation

        pEnvelope = pMxDoc.CurrentLocation.Envelope
        pEnvelope.Expand(pMxDoc.SearchTolerance, pMxDoc.SearchTolerance, False)

        'Refresh the old selection to erase it
        pActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeoSelection, Nothing, Nothing)

        If shift = 1 Then

            pMxApp.SelectionEnvironment.CombinationMethod = ESRI.ArcGIS.Carto.esriSelectionResultEnum.esriSelectionResultXOR
            pMxApp.SelectionEnvironment.CombinationMethod = ESRI.ArcGIS.Carto.esriSelectionResultEnum.esriSelectionResultNew

        End If

        'Play the progress animation

        'Perform the selection using a point created on mouse down
        pMap.SelectByShape(pEnvelope, pMxApp.SelectionEnvironment, True)

        'Refresh again to draw the new selection
        pActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeoSelection, Nothing, Nothing)

    End Sub

    Protected Overrides Sub OnActivate()
        Dim pMap As IMap
        Dim pActiveView As IActiveView
        Dim pFeatureLayer As IFeatureLayer
        Dim pGC As IGraphicsContainer
        Dim pViewManager As IViewManager
        Dim pRgbColor As IRgbColor
        Dim MxStatusBar As IStatusBar
        Dim pProgAnim As IAnimationProgressor

        m_pMxDoc = My.ArcMap.Document
        pMap = m_pMxDoc.FocusMap
        pActiveView = m_pMxDoc.ActiveView
        MxStatusBar = My.ArcMap.Application.StatusBar

        pGC = pMap

        pViewManager = m_pMxDoc.FocusMap
        pViewManager.VerboseEvents = True
        ActiveViewEvents = m_pMxDoc.FocusMap

        'Play some progress animation
        pProgAnim = MxStatusBar.ProgressAnimation
        'Create the fill symbol
        m_pFillSymbol = New SimpleFillSymbol
        m_pOutlineSymbol = m_pFillSymbol.Outline

        m_pFillSymbol.Style = ESRI.ArcGIS.Display.esriSimpleFillStyle.esriSFSHollow

        'Create the outline symbol
        m_pOutlineSymbol.Style = ESRI.ArcGIS.Display.esriSimpleLineStyle.esriSLSSolid
        m_pOutlineSymbol.Width = 4

        pRgbColor = New RgbColor
        pRgbColor.Red = 197
        pRgbColor.Green = 0
        pRgbColor.Blue = 255
        m_pOutlineSymbol.Color = pRgbColor
        m_pFillSymbol.Outline = m_pOutlineSymbol

        MsgBox("finished OnActivate")

    End Sub

End Class