UseDPI Property

'Declaration
 
Public Property UseDPI As Boolean

Private Class MedicalViewerUseDPIForm : Inherits Form
    Private _medicalViewer As MedicalViewer
    Private _seriesManager As MedicalViewerSeriesManager
    Private Sub MedicalViewer_SizeChanged(ByVal sender As Object, ByVal e As EventArgs)
        _medicalViewer.Size = New Size(Me.ClientRectangle.Right, Me.ClientRectangle.Bottom)
    End Sub

    Public Sub New(ByVal output As MedicalViewerSeriesManager)
        DicomEngine.Startup()
        Dim _codecs As RasterCodecs = New RasterCodecs()

        AddHandler SizeChanged, AddressOf MedicalViewer_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)

        _seriesManager = output

        Dim cell As MedicalViewerMultiCell = New MedicalViewerMultiCell(Nothing, True, 1, 1)

        Dim index As Integer
        Dim count As Integer = output.Stacks(0).Items.Count
        Dim codecsInformation As CodecsImageInfo

        Dim imageInformation As MedicalViewerImageInformation() = New MedicalViewerImageInformation(count - 1) {}

        index = 0
        Do While index < count
            codecsInformation = _codecs.GetInformation(CStr(output.Stacks(0).Items(index).Data), True)

            imageInformation(index) = New MedicalViewerImageInformation()
            imageInformation(index).ImageHeight = codecsInformation.Width
            imageInformation(index).ImageWidth = codecsInformation.Width
            imageInformation(index).XResolution = codecsInformation.XResolution
            imageInformation(index).YResolution = codecsInformation.YResolution
            index += 1
        Loop

        AddHandler cell.FramesRequested, AddressOf cell_FramesRequested
        AddHandler FormClosing, AddressOf MedicalViewerLocalizer_FormClosing
        cell.EnableLowMemoryUsage(2, count, imageInformation)
        cell.FitImageToCell = False

        ' 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)
        AddHandler cell.CellMouseClick, AddressOf cell_CellMouseClick

        ' 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.ReferenceLine.Enabled = True
        cell.ReferenceLine.Color = Color.Yellow
        cell.ShowCellBoundaries = True

        _medicalViewer.Cells.Add(cell)
        ' 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)

        cell.PixelSpacing = output.Stacks(0).PixelSpacing

        index = 0
        Do While index < count
            cell.SetImagePosition(index, output.Stacks(0).Items(index).ImagePosition, (index = count - 1))
            index += 1
        Loop
        cell.ImageOrientation = output.Stacks(0).Items(0).ImageOrientationArray
        cell.FrameOfReferenceUID = output.Stacks(0).Items(0).FrameOfReferenceUID

        Controls.Add(_medicalViewer)
        _medicalViewer.Dock = DockStyle.Fill
        DicomEngine.Shutdown()
    End Sub

    Private Sub cell_CellMouseClick(ByVal sender As Object, ByVal e As MedicalViewerCellMouseEventArgs)

        ' This is used to switch between displaying the image using the DPI of the image relative to the DPI of the screen, or displaying it noramlly.
        CType(sender, MedicalViewerCell).UseDPI = Not (CType(sender, MedicalViewerCell)).UseDPI
    End Sub

    Private Sub MedicalViewerLocalizer_FormClosing(ByVal sender As Object, ByVal e As FormClosingEventArgs)
    End Sub

    Private Sub cell_FramesRequested(ByVal sender As Object, ByVal e As MedicalViewerRequestedFramesInformationEventArgs)
        Dim cell As MedicalViewerMultiCell = CType(sender, MedicalViewerMultiCell)
        Dim _codecs As RasterCodecs = New RasterCodecs()
        Dim i As Integer
        Dim image As RasterImage
        Dim fileName As String

        If e.RequestedFramesIndexes.Length > 0 Then
            fileName = CStr(_seriesManager.Stacks(0).Items(e.RequestedFramesIndexes(0)).Data)
            image = _codecs.Load(fileName)
        Else
            Return
        End If

        i = 1
        Do While i < e.RequestedFramesIndexes.Length
            fileName = CStr(_seriesManager.Stacks(0).Items(e.RequestedFramesIndexes(i)).Data)
            image.AddPage(_codecs.Load(fileName))
            i += 1
        Loop

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

    Public ReadOnly Property Viewer() As MedicalViewer
        Get
            Return _medicalViewer
        End Get
    End Property
End Class

Private Function GetMedicalViewerUseDPIForm() As MedicalViewerUseDPIForm
    Dim form As MedicalViewerSeriesManagerFrom = New MedicalViewerSeriesManagerFrom()
    Dim output As MedicalViewerSeriesManager = form.LoadJamesHead()

    Return New MedicalViewerUseDPIForm(output)
End Function

' This example changes the default window level value by decrease the width by 100. Then resets the images based on the new value.

Public Sub MedicalViewerUseDPIExample()
    Dim myForm As MedicalViewerUseDPIForm = GetMedicalViewerUseDPIForm()
    Dim medicalViewer As MedicalViewer = myForm.Viewer

    myForm.ShowDialog()
End Sub