EnableLowMemoryUsage(Int32,Int32,MedicalViewerImageInformation[]) Method

Enables loading frames only when viewed to more efficiently use the system memory.

Syntax

C#
Visual Basic
Objective-C
Java
C++

public void EnableLowMemoryUsage( 
   int hiddenFramesCount,
   int imageCount,
   MedicalViewerImageInformation[] imagesInformation
)

'Declaration
 
Public Overloads Sub EnableLowMemoryUsage( _
   ByVal hiddenFramesCount As Integer, _
   ByVal imageCount As Integer, _
   ByVal imagesInformation() As MedicalViewerImageInformation _
)

'Usage
 
Dim instance As MedicalViewerCell
Dim hiddenFramesCount As Integer
Dim imageCount As Integer
Dim imagesInformation() As MedicalViewerImageInformation
 
instance.EnableLowMemoryUsage(hiddenFramesCount, imageCount, imagesInformation)

public:
void EnableLowMemoryUsage( 
   int hiddenFramesCount,
   int imageCount,
   array<MedicalViewerImageInformation^>^ imagesInformation
)

Parameters

hiddenFramesCount: The number of unseen frames that the control will load. Setting this value for example, to 2, makes the control load the 2 frames before the viewed frames as well as the 2 frames after the viewed frames.
imageCount: The number of total frames that will be included in the specified cell.
imagesInformation: An object that contains the image information being set. Can be null

Remarks

The low memory usage feature works by preventing the control from loading all of the frames at runtime; instead, the control will load only the frames that are currently visible on the cell (plus the specified number of hidden frames). The control will send a request each time the user scrolls down or up, or changes the number of visible frames, etc. For example, suppose the cell layout is a 2X2 (see Rows and Columns, and the user needs to load more than 100000 frames. When low memory usage is enabled, the control will not load them all. Instead, this method will send a FramesRequested event when the cell is loaded, requesting 4 frames (1, 2, 3 and 4) (because the cell is 2X2). Once the user scrolls down the cell to view frame number 5, frame number 1 will be disposed of because it is no longer visible. Then the event will be fired to request frame number 5. When frames are requested, the user is supposed to send them to the control using the SetRequestedImage(RasterImage,Int32) method.
hiddenFramesCount allows the control load a specific number of frames ahead (so if you have a 2X2 cell and you set hiddenFramesCount to 3, the method will request (1, 2, 3, 4, 5, 6, 7). The method will normally request also 0, -1, -2. but since those indexes are not valid, the control will not request them.
If the low memory usage feature is not needed, load images directly by assigning the image to the cell using the Image property.
To stop using the low memory usage feature, remove the cell that has this feature enabled and then add it again.

Example

      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.

      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
      using Leadtools;
      using Leadtools.Codecs;
      using Leadtools.MedicalViewer;

      class MedicalViewerForm : Form
      {
         private MedicalViewer _medicalViewer;
         public Label label;
         void MedicalViewerForm_SizeChanged(object sender, EventArgs e)
         {
            _medicalViewer.Size = new Size(this.ClientRectangle.Right, this.ClientRectangle.Bottom);
         }

         public MedicalViewerForm()
         {
            RasterCodecs _codecs = new RasterCodecs();
            RasterImage _image;

            this.SizeChanged += new EventHandler(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(this.ClientRectangle.Right, this.ClientRectangle.Bottom - 10);

            // Load an image and then add it to the control.
            //_image = _codecs.Load(LeadtoolsExamples.Common.ImagesPath.Path + "xa.dcm");
            MedicalViewerMultiCell cell = new MedicalViewerMultiCell(null, 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, this.ClientRectangle.Bottom - 10);
            label.Size = new Size(this.ClientRectangle.Right, 10);
            label.Text = "Here the statistical information will appear";

            Controls.Add(_medicalViewer);
            _medicalViewer.Dock = DockStyle.Fill;
         }
         public MedicalViewer Viewer
         {
            get { return _medicalViewer; }
         }
      }

      MedicalViewerForm GetMedicalControl()
      {
         return new MedicalViewerForm();
      }

      // 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.

      public void MedicalViewerLowMemoryUsageExample()
      {
         MedicalViewerForm myForm = GetMedicalControl();
         MedicalViewer medicalViewer = myForm.Viewer;
         MedicalViewerMultiCell cell = (MedicalViewerMultiCell)(medicalViewer.Cells[0]);


         RasterCodecs codecs = new RasterCodecs();
         int i = 0;
         int count;


         CodecsImageInfo info;
         string fileName = Path.Combine(LEAD_VARS.ImagesDir,"xa.dcm");
         info = codecs.GetInformation(fileName, true);
         count = info.TotalPages;
         MedicalViewerImageInformation[] a = new MedicalViewerImageInformation[count];

         for (i = 0; i < count; i++)
         {
            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;
         }

         cell.ActiveSubCellChanged += new EventHandler<MedicalViewerActiveSubCellChangedEventArgs>(medicalViewer_ActiveSubCellChanged1);
         cell.FramesRequested += new EventHandler<MedicalViewerRequestedFramesInformationEventArgs>(medicalViewer_FramesRequested);
         cell.EnableLowMemoryUsage(2, count, a);
         myForm.ShowDialog();
      }

      void medicalViewer_ActiveSubCellChanged1(object sender, MedicalViewerActiveSubCellChangedEventArgs e)
      {
         string imageInformation = "";
         MedicalViewerMultiCell cell = (MedicalViewerMultiCell)sender;

         if (cell.VirtualImage[e.SubCellIndex].ImageExist)
         {
            imageInformation = "Image bit per pixel = " + cell.VirtualImage[e.SubCellIndex].Image.BitsPerPixel.ToString();
         }

         ((MedicalViewerForm)(cell.ParentViewer.Parent)).label.Text = imageInformation + " HasRegion = " + cell.VirtualImage[e.SubCellIndex].HasRegion;
      }

      void medicalViewer_FramesRequested(object sender, MedicalViewerRequestedFramesInformationEventArgs e)
      {
         MedicalViewerMultiCell cell = (MedicalViewerMultiCell)(sender);
         string fileName =Path.Combine(LEAD_VARS.ImagesDir,"xa.dcm");
         RasterCodecs _codecs = new RasterCodecs();
         int i;
         RasterImage b;

         if (e.RequestedFramesIndexes.Length > 0)
         {
            b = _codecs.Load(fileName, 0, CodecsLoadByteOrder.BgrOrGray, e.RequestedFramesIndexes[0] + 1, e.RequestedFramesIndexes[0] + 1);
         }
         else
            return;

         for (i = 1; i < e.RequestedFramesIndexes.Length; i++)
         {
            b.AddPage(_codecs.Load(fileName, 0, CodecsLoadByteOrder.BgrOrGray, e.RequestedFramesIndexes[i] + 1, e.RequestedFramesIndexes[i] + 1));
         }

         cell.SetRequestedImage(b, e.RequestedFramesIndexes, MedicalViewerSetImageOptions.Insert);
      }


      static class LEAD_VARS
      {
      public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
      }

      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.

      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
      using Leadtools;
      using Leadtools.Codecs;
      using Leadtools.MedicalViewer;

      class MedicalViewerForm : Form
      {
         private MedicalViewer _medicalViewer;
         public Label label;
         void MedicalViewerForm_SizeChanged(object sender, EventArgs e)
         {
            _medicalViewer.Size = new Size(this.ClientRectangle.Right, this.ClientRectangle.Bottom);
         }

         public MedicalViewerForm()
         {
            RasterCodecs _codecs = new RasterCodecs();
            RasterImage _image;

            this.SizeChanged += new EventHandler(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(this.ClientRectangle.Right, this.ClientRectangle.Bottom - 10);

            // Load an image and then add it to the control.
            //_image = _codecs.Load(LeadtoolsExamples.Common.ImagesPath.Path + "xa.dcm");
            MedicalViewerMultiCell cell = new MedicalViewerMultiCell(null, 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, this.ClientRectangle.Bottom - 10);
            label.Size = new Size(this.ClientRectangle.Right, 10);
            label.Text = "Here the statistical information will appear";

            Controls.Add(_medicalViewer);
            _medicalViewer.Dock = DockStyle.Fill;
         }
         public MedicalViewer Viewer
         {
            get { return _medicalViewer; }
         }
      }

      MedicalViewerForm GetMedicalControl()
      {
         return new MedicalViewerForm();
      }

      // 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.

      public void MedicalViewerLowMemoryUsageExample()
      {
         MedicalViewerForm myForm = GetMedicalControl();
         MedicalViewer medicalViewer = myForm.Viewer;
         MedicalViewerMultiCell cell = (MedicalViewerMultiCell)(medicalViewer.Cells[0]);


         RasterCodecs codecs = new RasterCodecs();
         int i = 0;
         int count;


         CodecsImageInfo info;
         string fileName = Path.Combine(LEAD_VARS.ImagesDir,"xa.dcm");
         info = codecs.GetInformation(fileName, true);
         count = info.TotalPages;
         MedicalViewerImageInformation[] a = new MedicalViewerImageInformation[count];

         for (i = 0; i < count; i++)
         {
            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;
         }

         cell.ActiveSubCellChanged += new EventHandler<MedicalViewerActiveSubCellChangedEventArgs>(medicalViewer_ActiveSubCellChanged1);
         cell.FramesRequested += new EventHandler<MedicalViewerRequestedFramesInformationEventArgs>(medicalViewer_FramesRequested);
         cell.EnableLowMemoryUsage(2, count, a);
         myForm.ShowDialog();
      }

      void medicalViewer_ActiveSubCellChanged1(object sender, MedicalViewerActiveSubCellChangedEventArgs e)
      {
         string imageInformation = "";
         MedicalViewerMultiCell cell = (MedicalViewerMultiCell)sender;

         if (cell.VirtualImage[e.SubCellIndex].ImageExist)
         {
            imageInformation = "Image bit per pixel = " + cell.VirtualImage[e.SubCellIndex].Image.BitsPerPixel.ToString();
         }

         ((MedicalViewerForm)(cell.ParentViewer.Parent)).label.Text = imageInformation + " HasRegion = " + cell.VirtualImage[e.SubCellIndex].HasRegion;
      }

      void medicalViewer_FramesRequested(object sender, MedicalViewerRequestedFramesInformationEventArgs e)
      {
         MedicalViewerMultiCell cell = (MedicalViewerMultiCell)(sender);
         string fileName =Path.Combine(LEAD_VARS.ImagesDir,"xa.dcm");
         RasterCodecs _codecs = new RasterCodecs();
         int i;
         RasterImage b;

         if (e.RequestedFramesIndexes.Length > 0)
         {
            b = _codecs.Load(fileName, 0, CodecsLoadByteOrder.BgrOrGray, e.RequestedFramesIndexes[0] + 1, e.RequestedFramesIndexes[0] + 1);
         }
         else
            return;

         for (i = 1; i < e.RequestedFramesIndexes.Length; i++)
         {
            b.AddPage(_codecs.Load(fileName, 0, CodecsLoadByteOrder.BgrOrGray, e.RequestedFramesIndexes[i] + 1, e.RequestedFramesIndexes[i] + 1));
         }

         cell.SetRequestedImage(b, e.RequestedFramesIndexes, MedicalViewerSetImageOptions.Insert);
      }


      static class LEAD_VARS
      {
      public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
      }

      using Leadtools;
      using Leadtools.Codecs;
      using Leadtools.MedicalViewer;

      class MedicalViewerForm : Form
      {
         private MedicalViewer _medicalViewer;
         public Label label;
         void MedicalViewerForm_SizeChanged(object sender, EventArgs e)
         {
            _medicalViewer.Size = new Size(this.ClientRectangle.Right, this.ClientRectangle.Bottom);
         }

         public MedicalViewerForm()
         {
            RasterCodecs _codecs = new RasterCodecs();
            RasterImage _image;

            this.SizeChanged += new EventHandler(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(this.ClientRectangle.Right, this.ClientRectangle.Bottom - 10);

            // Load an image and then add it to the control.
            //_image = _codecs.Load(LeadtoolsExamples.Common.ImagesPath.Path + "xa.dcm");
            MedicalViewerMultiCell cell = new MedicalViewerMultiCell(null, 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, this.ClientRectangle.Bottom - 10);
            label.Size = new Size(this.ClientRectangle.Right, 10);
            label.Text = "Here the statistical information will appear";

            Controls.Add(_medicalViewer);
            _medicalViewer.Dock = DockStyle.Fill;
         }
         public MedicalViewer Viewer
         {
            get { return _medicalViewer; }
         }
      }

      MedicalViewerForm GetMedicalControl()
      {
         return new MedicalViewerForm();
      }

      // 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.

      public void MedicalViewerLowMemoryUsageExample()
      {
         MedicalViewerForm myForm = GetMedicalControl();
         MedicalViewer medicalViewer = myForm.Viewer;
         MedicalViewerMultiCell cell = (MedicalViewerMultiCell)(medicalViewer.Cells[0]);


         RasterCodecs codecs = new RasterCodecs();
         int i = 0;
         int count;


         CodecsImageInfo info;
         string fileName = Path.Combine(LEAD_VARS.ImagesDir,"xa.dcm");
         info = codecs.GetInformation(fileName, true);
         count = info.TotalPages;
         MedicalViewerImageInformation[] a = new MedicalViewerImageInformation[count];

         for (i = 0; i < count; i++)
         {
            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;
         }

         cell.ActiveSubCellChanged += new EventHandler<MedicalViewerActiveSubCellChangedEventArgs>(medicalViewer_ActiveSubCellChanged1);
         cell.FramesRequested += new EventHandler<MedicalViewerRequestedFramesInformationEventArgs>(medicalViewer_FramesRequested);
         cell.EnableLowMemoryUsage(2, count, a);
         myForm.ShowDialog();
      }

      void medicalViewer_ActiveSubCellChanged1(object sender, MedicalViewerActiveSubCellChangedEventArgs e)
      {
         string imageInformation = "";
         MedicalViewerMultiCell cell = (MedicalViewerMultiCell)sender;

         if (cell.VirtualImage[e.SubCellIndex].ImageExist)
         {
            imageInformation = "Image bit per pixel = " + cell.VirtualImage[e.SubCellIndex].Image.BitsPerPixel.ToString();
         }

         ((MedicalViewerForm)(cell.ParentViewer.Parent)).label.Text = imageInformation + " HasRegion = " + cell.VirtualImage[e.SubCellIndex].HasRegion;
      }

      void medicalViewer_FramesRequested(object sender, MedicalViewerRequestedFramesInformationEventArgs e)
      {
         MedicalViewerMultiCell cell = (MedicalViewerMultiCell)(sender);
         string fileName =Path.Combine(LEAD_VARS.ImagesDir,"xa.dcm");
         RasterCodecs _codecs = new RasterCodecs();
         int i;
         RasterImage b;

         if (e.RequestedFramesIndexes.Length > 0)
         {
            b = _codecs.Load(fileName, 0, CodecsLoadByteOrder.BgrOrGray, e.RequestedFramesIndexes[0] + 1, e.RequestedFramesIndexes[0] + 1);
         }
         else
            return;

         for (i = 1; i < e.RequestedFramesIndexes.Length; i++)
         {
            b.AddPage(_codecs.Load(fileName, 0, CodecsLoadByteOrder.BgrOrGray, e.RequestedFramesIndexes[i] + 1, e.RequestedFramesIndexes[i] + 1));
         }

         cell.SetRequestedImage(b, e.RequestedFramesIndexes, MedicalViewerSetImageOptions.Insert);
      }


      static class LEAD_VARS
      {
      public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
      }

Requirements

Target Platforms

Reference

MedicalViewerCell Class
MedicalViewerCell Members
Overload List