VirtualImage Property

Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.MedicalViewer

Private Class MedicalViewerForm : Inherits Form
   Private _medicalViewer As MedicalViewer
   Public label As Label
   Private Sub MedicalViewerForm_SizeChanged(ByVal sender As Object, ByVal e As EventArgs)
      _medicalViewer.Size = New Size(Me.ClientRectangle.Right, Me.ClientRectangle.Bottom)
   End Sub

   Public Sub New()
      Dim _codecs As RasterCodecs = New RasterCodecs()
      Dim _image As RasterImage

      AddHandler SizeChanged, AddressOf MedicalViewerForm_SizeChanged

      ' Create the medical viewer and adjust the size and the location.
      _medicalViewer = New MedicalViewer(1, 2)
      _medicalViewer.Location = New Point(0, 0)
      _medicalViewer.Size = New Size(Me.ClientRectangle.Right, Me.ClientRectangle.Bottom - 10)

      ' Load an image and then add it to the control.
      '_image = _codecs.Load(LeadtoolsExamples.Common.ImagesPath.Path + "xa.dcm");
      Dim cell As MedicalViewerMultiCell = New MedicalViewerMultiCell(Nothing, True, 1, 1)
      _medicalViewer.Cells.Add(cell)

      ' add some actions that will be used to change the properties of the images inside the control.
      cell.AddAction(MedicalViewerActionType.WindowLevel)
      cell.AddAction(MedicalViewerActionType.Alpha)
      cell.AddAction(MedicalViewerActionType.Offset)

      ' assign the added actions to a mouse button, meaning that when the user clicks and drags the mouse button, the associated action will be activated.
      cell.SetAction(MedicalViewerActionType.WindowLevel, MedicalViewerMouseButtons.Left, MedicalViewerActionFlags.Active)
      cell.SetAction(MedicalViewerActionType.Alpha, MedicalViewerMouseButtons.Middle, MedicalViewerActionFlags.Active)
      cell.SetAction(MedicalViewerActionType.Offset, MedicalViewerMouseButtons.Right, MedicalViewerActionFlags.Active)

      cell.Rows = 1
      cell.Columns = 1
      cell.FitImageToCell = True

      ' adjust some properties of the cell and add some tags.
      _medicalViewer.Cells(0).SetTag(2, MedicalViewerTagAlignment.TopLeft, MedicalViewerTagType.UserData, "EX. ID 230-36-5448")
      _medicalViewer.Cells(0).SetTag(4, MedicalViewerTagAlignment.TopLeft, MedicalViewerTagType.Frame)
      _medicalViewer.Cells(0).SetTag(6, MedicalViewerTagAlignment.TopLeft, MedicalViewerTagType.Scale)
      _medicalViewer.Cells(0).SetTag(2, MedicalViewerTagAlignment.BottomLeft, MedicalViewerTagType.WindowLevelData)
      _medicalViewer.Cells(0).SetTag(1, MedicalViewerTagAlignment.BottomLeft, MedicalViewerTagType.FieldOfView)


      ' Load another image and then add it to the control.
      _image = _codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "mr.dcm"))
      _medicalViewer.Cells.Add(New MedicalViewerMultiCell(_image, True, 2, 2))

      ' add some actions that will be used to change the properties of the images inside the control.
      _medicalViewer.Cells(1).AddAction(MedicalViewerActionType.WindowLevel)
      _medicalViewer.Cells(1).AddAction(MedicalViewerActionType.Alpha)
      _medicalViewer.Cells(1).AddAction(MedicalViewerActionType.Offset)
      _medicalViewer.Cells(1).AddAction(MedicalViewerActionType.RectangleRegion)

      ' assign the added actions to a mouse button, meaning that when the user clicks and drags the mouse button, the associated action will be activated.
      _medicalViewer.Cells(1).SetAction(MedicalViewerActionType.RectangleRegion, MedicalViewerMouseButtons.Left, MedicalViewerActionFlags.Active)
      _medicalViewer.Cells(1).SetAction(MedicalViewerActionType.Alpha, MedicalViewerMouseButtons.Middle, MedicalViewerActionFlags.Active)
      _medicalViewer.Cells(1).SetAction(MedicalViewerActionType.Offset, MedicalViewerMouseButtons.Right, MedicalViewerActionFlags.Active)

      ' adjust some properties of the cell and add some tags.
      _medicalViewer.Cells(1).SetTag(2, MedicalViewerTagAlignment.TopLeft, MedicalViewerTagType.UserData, "EX. ID 230-36-5448")
      _medicalViewer.Cells(1).SetTag(4, MedicalViewerTagAlignment.TopLeft, MedicalViewerTagType.Frame)
      _medicalViewer.Cells(1).SetTag(6, MedicalViewerTagAlignment.TopLeft, MedicalViewerTagType.Scale)
      _medicalViewer.Cells(1).SetTag(2, MedicalViewerTagAlignment.BottomLeft, MedicalViewerTagType.WindowLevelData)
      _medicalViewer.Cells(1).SetTag(1, MedicalViewerTagAlignment.BottomLeft, MedicalViewerTagType.FieldOfView)

      label = New Label()
      label.Location = New Point(0, Me.ClientRectangle.Bottom - 10)
      label.Size = New Size(Me.ClientRectangle.Right, 10)
      label.Text = "Here the statistical information will appear"

      Controls.Add(_medicalViewer)
      _medicalViewer.Dock = DockStyle.Fill
   End Sub
   Public ReadOnly Property Viewer() As MedicalViewer
      Get
         Return _medicalViewer
      End Get
   End Property
End Class

Private Function GetMedicalControl() As MedicalViewerForm
   Return New MedicalViewerForm()
End Function

' This example shows how to use the low memory usage feature to display a medical image with multiple pages. it will also invert all the bitmap to show the invert function works even if the bitmap is not loaded yet.
<TestMethod()> _
Public Sub MedicalViewerLowMemoryUsageExample()
   Dim myForm As MedicalViewerForm = GetMedicalControl()
   Dim medicalViewer As MedicalViewer = myForm.Viewer
   Dim cell As MedicalViewerMultiCell = CType(medicalViewer.Cells(0), MedicalViewerMultiCell)


   Dim codecs As RasterCodecs = New RasterCodecs()
   Dim i As Integer = 0
   Dim count As Integer


   Dim info As CodecsImageInfo
   Dim fileName As String = Path.Combine(LEAD_VARS.ImagesDir, "xa.dcm")
   info = codecs.GetInformation(fileName, True)
   count = info.TotalPages
   Dim a As MedicalViewerImageInformation() = New MedicalViewerImageInformation(count - 1) {}

   i = 0
   Do While i < count
      info = codecs.GetInformation(fileName, True, i + 1)
      a(i) = New MedicalViewerImageInformation()
      a(i).ImageHeight = info.Height
      a(i).ImageWidth = info.Width
      a(i).XResolution = info.XResolution
      a(i).YResolution = info.YResolution
      i += 1
   Loop

   AddHandler cell.ActiveSubCellChanged, AddressOf medicalViewer_ActiveSubCellChanged1
   AddHandler cell.FramesRequested, AddressOf medicalViewer_FramesRequested
   cell.EnableLowMemoryUsage(2, count, a)
   myForm.ShowDialog()
End Sub

Private Sub medicalViewer_ActiveSubCellChanged1(ByVal sender As Object, ByVal e As MedicalViewerActiveSubCellChangedEventArgs)
   Dim imageInformation As String = ""
   Dim cell As MedicalViewerMultiCell = CType(sender, MedicalViewerMultiCell)

   If cell.VirtualImage(e.SubCellIndex).ImageExist Then
      imageInformation = "Image bit per pixel = " & cell.VirtualImage(e.SubCellIndex).Image.BitsPerPixel.ToString()
   End If

   CType(cell.ParentViewer.Parent, MedicalViewerForm).label.Text = imageInformation & " HasRegion = " & cell.VirtualImage(e.SubCellIndex).HasRegion
End Sub

Private Sub medicalViewer_FramesRequested(ByVal sender As Object, ByVal e As MedicalViewerRequestedFramesInformationEventArgs)
   Dim cell As MedicalViewerMultiCell = CType(sender, MedicalViewerMultiCell)
   Dim fileName As String = Path.Combine(LEAD_VARS.ImagesDir, "xa.dcm")
   Dim _codecs As RasterCodecs = New RasterCodecs()
   Dim i As Integer
   Dim b As RasterImage

   If e.RequestedFramesIndexes.Length > 0 Then
      b = _codecs.Load(fileName, 0, CodecsLoadByteOrder.BgrOrGray, e.RequestedFramesIndexes(0) + 1, e.RequestedFramesIndexes(0) + 1)
   Else
      Return
   End If

   i = 1
   Do While i < e.RequestedFramesIndexes.Length
      b.AddPage(_codecs.Load(fileName, 0, CodecsLoadByteOrder.BgrOrGray, e.RequestedFramesIndexes(i) + 1, e.RequestedFramesIndexes(i) + 1))
      i += 1
   Loop

   cell.SetRequestedImage(b, e.RequestedFramesIndexes, MedicalViewerSetImageOptions.Insert)
End Sub


Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class