How To: Analyze the position of each word in the text

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How To: Analyze the position of each word in the text

Post by tjimenez » Sun Feb 24, 2013 06:08 PM

Hello,

We are testing your "VintaSoftPDF.NET SDK" & "VintaSoftImaging.NET SDK" to get the following:

Explore each word in the text of PDF file for to know his position (X,Y,width and height -rounding box-)

If we have next portion of code:

----------------------------------------------------------------------------------------------------------------------------------------------
    Private imageViewer1 As Vintasoft.Imaging.ImageViewer
    Private _fileStream As System.IO.Stream = Nothing
    Private _document As Vintasoft.Pdf.PdfDocument
    Private _useEmbeddedThumbnails As Boolean = True
    Private _titlePrefix As String = "VintaSoft PDF Reader Demo v3.1 {0}"
    Private _isFirstOpenedPage As Boolean = False

            _fileStream = New System.IO.FileStream(strArchivoPDF, System.IO.FileMode.Open, System.IO.FileAccess.Read)
            _document = Vintasoft.Pdf.PdfDocumentController.OpenDocument(_fileStream)
            _document.RenderingSettings.DrawPdfAnnotations = True
            _document.RenderingSettings.DrawVintasoftAnnotations = True
            _document.RenderingSettings.UseEmbeddedThumbnails = _useEmbeddedThumbnails
            _fileStream.Position = 0
            Dim openFileThread As New System.Threading.Thread(AddressOf OpenFileAsynchronously)
            openFileThread.Start()
            _isFirstOpenedPage = True
            Text = String.Format(_titlePrefix, String.Format("- {0}", System.IO.Path.GetFileName(strArchivoPDF)))
            If _document.IsEncrypted Then
                Text += " (SECURED)"
            End If
            ' #############################
            ' Let's go to generate JPG's...
            ' #############################
            firstPage = 1
            lastPage = _document.Pages.Count

            For pageNo = 1 To _document.Pages.Count
                    strNombreArchivoJPG = "PAG_" & Format(pageNo, "000") & ".jpg"
                    MsgBox(_document.Pages(pageNo).TextRegion.TextContent)
                    'we need to explore the position of each word in the text
                    .../...
            Next
----------------------------------------------------------------------------------------------------------------------------------------------

We have been reviewing the help, not just find a way to do this easily with TextRegion, Subregion, LineSubregion, GetWordSubRegion ???
We don't understand who it works...
Can you help us ?
Thanks.

Re: How To: Analyze the position of each word in the text

Post by Alex » Mon Feb 25, 2013 07:50 AM

Hello,

Here is an example that demonstrates how to get positions of words on PDF page:

Imports System.Drawing
Imports Vintasoft.Pdf
Imports Vintasoft.Pdf.Tree
Imports Vintasoft.Pdf.Content.TextExtraction

Module Module1

    Sub Main()
        ' open existing PDF document
        Dim pdfDocument As New PdfDocument("d:\PdfTest.pdf")

        ' for each PDF page
        For i As Integer = 0 To pdfDocument.Pages.Count - 1
            Console.WriteLine(String.Format("PDF page {0}", i))

            GetInfoAboutWordsOfPdfPage(pdfDocument.Pages(i))
        Next

        ' free resources
        pdfDocument.Dispose()

        Console.ReadLine()
    End Sub

    Public Sub GetInfoAboutWordsOfPdfPage(ByVal page As PdfPage)
        Dim region As TextRegion = page.TextRegion
        ' for each text line on PDF page
        For i As Integer = 0 To region.Lines.Length - 1
            Dim line As TextRegionLine = region.Lines(i)
            Console.WriteLine(String.Format("  Line{0}", i))

            Dim wordIndexInLine As Integer = 0
            Dim wordString As String = ""
            Dim wordStartSymbolIndex As Integer = 0
            Dim wordEndSymbolIndex As Integer = 0
            Dim curentSymbol As TextRegionSymbol
            ' for each symbol in text line
            For j As Integer = 0 To line.Symbols.Length - 1
                curentSymbol = line.Symbols(j)

                wordString = String.Format("{0}{1}", wordString, curentSymbol.TextSymbol.Symbol)

                If curentSymbol.TextSymbol.Symbol = " " Then
                    Dim wordX As Single = line.Symbols(wordStartSymbolIndex).Region.LeftTop.X
                    Dim wordY As Single = line.Symbols(wordStartSymbolIndex).Region.LeftTop.Y
                    Dim wordWidth As Single = line.Symbols(wordEndSymbolIndex).Region.RightBottom.X - wordX
                    Dim wordHeight As Single = line.Symbols(wordEndSymbolIndex).Region.RightBottom.Y - wordY
                    Console.WriteLine(String.Format("    Word{0}={1}, X={2}, Y={3}, Width={4}, Height={5}", _
                                        wordIndexInLine, _
                                        wordString, _
                                        wordX, wordY, wordWidth, wordHeight))

                    wordIndexInLine = wordIndexInLine + 1
                    wordString = ""
                    wordStartSymbolIndex = j + 1
                    wordEndSymbolIndex = j + 1
                End If
            Next
        Next
    End Sub

End Module

Best regards, Alexander

Re: How To: Analyze the position of each word in the text

Post by tjimenez » Mon Feb 25, 2013 12:10 PM

Okay, it's a lot easier than I thought.
Thank you very much for your efficiency.

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