'Declaration
 
Public Overloads Sub Add( _
   ByVal options As ImGearPDETextFlags, _
   ByVal index As Integer, _
   ByVal text As String, _
   ByVal font As ImGearPDEFont, _
   ByVal graphicsState As ImGearPDEGraphicState, _
   ByVal textState As ImGearPDETextState, _
   ByVal textMatrix As ImGearPDFFixedMatrix _
) 

Private sampleText As String = "Russian: Русский Текст. Greek: Κείμενο στην ελληνική γλώσσα. Japanese: 日本  Chinese: 借用本院學術活動中"
	Private Shared Sub AddUnicodeTextToDocument(ByVal igPdfDocument As ImGearPDFDocument, ByVal textToAdd As String)
    ' Initialize current page attributes.
    Const pageWidth As Integer = CInt((8.5 * 300))
    Const pageHeight As Integer = 11 * 300
    Dim usLetterRectangle As ImGearPDFFixedRect = New ImGearPDFFixedRect(0, 0, ImGearPDF.IntToFixed(pageWidth), ImGearPDF.IntToFixed(pageHeight))
    
    ' Create new PDF page in document.
    Dim igPdfPage As ImGearPDFPage = igPdfDocument.CreateNewPage(-1, usLetterRectangle)
    
    ' This is current text position on the page.
    Dim xPosition As Integer = 20, yPosition As Integer = 40
    
    Const encodingName As String = "Identity-H"
    Dim encoding As ImGearPDFSysEncoding = New ImGearPDFSysEncoding(New ImGearPDFAtom(encodingName))
    
    ' Enumerate all system fonts to find one that can represent our text. Add to the page.
    ImGearPDFSysFont.Enumerate(New ImGearPDFSysFont.ImGearPDFSysFontEnumerate(Function(ByVal systemFont As ImGearPDFSysFont, ByVal userData As Object)
        ' // Check the possibility to create font by system font with given encoding.
        Dim flags As ImGearPDEFontCreateFlags = systemFont.GetCreateFlags(encoding)
        If flags = ImGearPDEFontCreateFlags.CREATE_NOT_ALLOWED Then
            Return True
        End If

        ' Check the possibility to create font for unicode text, embedding, and embedding only a subset.
        If (flags And ImGearPDEFontCreateFlags.CREATE_TO_UNICODE) = 0 Or
           (flags And ImGearPDEFontCreateFlags.CREATE_EMBEDDED) = 0 Or
           (flags And ImGearPDEFontCreateFlags.CREATE_SUBSET) = 0 Then
            Return True
        End If

        ' Create the font by system font.
        Using font As ImGearPDEFont = New ImGearPDEFont(systemFont, encoding, New ImGearPDFAtom(systemFont.Name.String), flags)
            ' Check this font is able to represent given string.
            If font.IsTextRepresentable(textToAdd) Then
                ' Get content that be able to fix the changes.
                Dim pdfContent As ImGearPDEContent = igPdfPage.GetContent()
                
                ' Integrate text to the current page.
                Dim textElement As ImGearPDEText = CreateTextElement(textToAdd, font, 30, xPosition, pageHeight - yPosition, pageWidth - 40)
                If textElement IsNot Nothing Then
                    pdfContent.AddElement(CInt(ImGearPDEInsertElement.AFTER_LAST), textElement)
                    textElement.Dispose()
                End If

                ' Fix the changes on the page and release content.
                igPdfPage.SetContent()
                igPdfPage.ReleaseContent()
                
                ' Integrate font to the document.
                If textElement IsNot Nothing Then
                    font.CreateToUnicodeNow(igPdfDocument)
                    font.EmbedNow(igPdfDocument)
                    font.SubsetNow(igPdfDocument)
                    Return False
                End If
            End If
        End Using

        Return True
    End Function), Nothing)
    
    ' Release current PDF page.
    igPdfPage.Dispose()
    
End Sub


Private Shared Function CreateTextElement(ByVal Text As String, ByVal Font As ImGearPDEFont, ByVal FontSize As Int32, ByVal x As Integer, ByVal y As Integer, ByVal w As Integer) As ImGearPDEText
    Dim textElement As ImGearPDEText = Nothing
    
    Dim colorSpace As ImGearPDEColorSpace = New ImGearPDEColorSpace(New ImGearPDFAtom("DeviceGray"))
    
    Dim gState As ImGearPDEGraphicState = New ImGearPDEGraphicState()
    gState.StrokeColorSpec.Space = colorSpace
    gState.FillColorSpec.Space = colorSpace
    gState.MiterLimit = CInt(ImGearPDFFixedValues.TEN)
    gState.Flatness = CInt(ImGearPDFFixedValues.ONE)
    gState.LineWidth = CInt(ImGearPDFFixedValues.ONE)
    
    Dim textMatrix As ImGearPDFFixedMatrix = New ImGearPDFFixedMatrix()
    textMatrix.A = ImGearPDF.IntToFixed(FontSize)
    textMatrix.D = ImGearPDF.IntToFixed(FontSize)
    textMatrix.H = ImGearPDF.IntToFixed(x)
    textMatrix.V = ImGearPDF.IntToFixed(y)
    
    textElement = New ImGearPDEText()
    textElement.Add(ImGearPDETextFlags.RUN, 0, Text, Font, gState, Nothing, textMatrix)
    
    colorSpace.Dispose()
    gState.Dispose()
    
    Return textElement
End Function