' Copyright 2011 ESRI
' 
' All rights reserved under the copyright laws of the United States
' and applicable international laws, treaties, and conventions.
' 
' You may freely redistribute and use this sample code, with or
' without modification, provided you include the original copyright
' notice and use restrictions.
' 
' See the use restrictions.
' 

Imports System.Collections.Generic
Imports System.Linq
Imports System.Text

Imports ESRI.ArcGISExplorer.Geometry

' This class can be used to edit the vertices of single-part polygons and polylines, and also of multipoints.
' If used to edit multipart polygons or polylines, only the first part is edited; the class can be extended to
' edit multiparts.
Class VertexGeometry
  Private _pgon As Polygon = Nothing
  Private _pline As Polyline = Nothing
  Private _mpt As Multipoint = Nothing

  Public Sub New(geom As Geometry)
    Select Case geom.GeometryType
      Case GeometryType.Polygon
        _pgon = TryCast(geom, Polygon)
        Exit Select
      Case GeometryType.Polyline
        _pline = TryCast(geom, Polyline)
        Exit Select
      Case GeometryType.Multipoint
        _mpt = TryCast(geom, Multipoint)
        Exit Select
      Case Else
        Throw New NotSupportedException()
    End Select
  End Sub

  Public Function GetPoint(vertexIndex As Integer) As Point
    Dim retVal As Point = Nothing
    If _pgon IsNot Nothing Then
      retVal = _pgon.GetPoint(vertexIndex)
    ElseIf _pline IsNot Nothing Then
      retVal = _pline.GetPoint(vertexIndex)
    ElseIf _mpt IsNot Nothing Then
      retVal = _mpt.GetPoint(vertexIndex)
    End If
    Return retVal
  End Function

  Public Sub SetPoint(vertexIndex As Integer, newPoint As Point)
    If _pgon IsNot Nothing Then
      _pgon.SetPoint(vertexIndex, newPoint)
    ElseIf _pline IsNot Nothing Then
      _pline.SetPoint(vertexIndex, newPoint)
    ElseIf _mpt IsNot Nothing Then
      _mpt.SetPoint(vertexIndex, newPoint)
    End If
  End Sub

  Public Function PointCount() As Integer
    Dim retVal As Integer = -1
    If _pgon IsNot Nothing Then
      retVal = _pgon.PointCount(0)
    ElseIf _pline IsNot Nothing Then
      retVal = _pline.PointCount(0)
    ElseIf _mpt IsNot Nothing Then
      retVal = _mpt.PointCount
    End If
    Return retVal
  End Function
End Class