Getting the location within a pdf document

[Todd Holliday]

I am using the WPF PdfViewer hosted in a WinForms application. This was the only way I could get the freehand annotation tools.

I am having several issues that all revolve around not being able to get the actual position on a pdf page. I have setup an event for a mouse click on the page which then calls a function to insert text at the position specified in the args variable. As I understand the documentation this is supposed to be the position relative to the current document.

    Private Sub Viewer_PageClicked(sender As Object, args As Syncfusion.Windows.PdfViewer.PageClickedEventArgs) Handles Viewer.PageClicked

        If tsbBallonText.Checked Then

            InsertTextObj(args.Position)

        End If

    End Sub

The InsertTextObj simply captures the text and creates a free text annotation at the position of the mouse click.

    Private Sub InsertTextObj(ByVal pointInPage As Windows.Point)

        Dim pdfDoc As PdfLoadedDocument = Viewer.LoadedDocument

        If pdfDoc Is Nothing Then

            Return

        End If

        Dim iPage As Integer = Viewer.CurrentPageIndex - 1

        Dim pdfPg As PdfLoadedPage = pdfDoc.Pages(iPage)

        Dim dlgText As New dlgTextInput

        dlgText.tbMessageText.Font = textFont

        If dlgText.ShowDialog() = DialogResult.OK Then

            Dim sText As String = dlgText.tbMessageText.Text

            Dim bPopup As Boolean = dlgText.tsbPopUp.Checked

            Dim iRotation As Integer = dlgText.nmRotation.Value

            textFont = dlgText.tbMessageText.Font

            Dim pFont As Syncfusion.Pdf.Graphics.PdfFont = New Syncfusion.Pdf.Graphics.PdfTrueTypeFont(textFont)

            Dim sSize As SizeF = GetTextSize(sText, textFont.Name, textFont.Size)

            Dim freeText As New PdfFreeTextAnnotation(New RectangleF(pointInPage.X, pointInPage.Y, sSize.Width, sSize.Height))

            freeText.Name = "Field_FreeText"

            freeText.Font = pFont

            freeText.Text = sText

            pdfPg.Annotations.Add(freeText)

            Dim ms As New IO.MemoryStream

            pdfDoc.Save(ms)

            pdfView.pdfViewer.Load(ms)

        End If

        dlgText.Close()

    End Sub

When the annotation is created it is no where near the X and Y points I send it. The difference between the points sent from the PageClick function are not consistent when clicking different locations on the page. I have this same issue when attempting to drag and drop text on to the pdf page. I can't find a way to get the actual page location from the screen location that is sent to the Drop event. Since this is a hosted WPF control and not a WinForms control the PointToClient method is not available. Any help on this would be greatly appreciated.

Thanks

ToddH

[Divya Dhayalan]

Hi Todd, 

 

Thank you for contacting Syncfusion support. 

 

Please find the table below. 

 

Query	Details
I am using the WPF PdfViewer hosted in a WinForms application. This was the only way I could get the freehand annotation tools.    I am having several issues that all revolve around not being able to get the actual position on a pdf page. I have setup an event for a mouse click on the page which then calls a function to insert text at the position specified in the args variable. As I understand the documentation this is supposed to be the position relative to the current document.        Private Sub Viewer_PageClicked(sender As Object, args As Syncfusion.Windows.PdfViewer.PageClickedEventArgs) Handles Viewer.PageClicked          If tsbBallonText.Checked Then              InsertTextObj(args.Position)          End If      End Sub    The InsertTextObj simply captures the text and creates a free text annotation at the position of the mouse click.        Private Sub InsertTextObj(ByVal pointInPage As Windows.Point)          Dim pdfDoc As PdfLoadedDocument = Viewer.LoadedDocument          If pdfDoc Is Nothing Then              Return          End If          Dim iPage As Integer = Viewer.CurrentPageIndex - 1          Dim pdfPg As PdfLoadedPage = pdfDoc.Pages(iPage)          Dim dlgText As New dlgTextInput          dlgText.tbMessageText.Font = textFont          If dlgText.ShowDialog() = DialogResult.OK Then              Dim sText As String = dlgText.tbMessageText.Text              Dim bPopup As Boolean = dlgText.tsbPopUp.Checked              Dim iRotation As Integer = dlgText.nmRotation.Value              textFont = dlgText.tbMessageText.Font              Dim pFont As Syncfusion.Pdf.Graphics.PdfFont = New Syncfusion.Pdf.Graphics.PdfTrueTypeFont(textFont)              Dim sSize As SizeF = GetTextSize(sText, textFont.Name, textFont.Size)              Dim freeText As New PdfFreeTextAnnotation(New RectangleF(pointInPage.X, pointInPage.Y, sSize.Width, sSize.Height))              freeText.Name = "Field_FreeText"              freeText.Font = pFont              freeText.Text = sText              pdfPg.Annotations.Add(freeText)              Dim ms As New IO.MemoryStream              pdfDoc.Save(ms)              pdfView.pdfViewer.Load(ms)          End If          dlgText.Close()      End Sub    When the annotation is created it is nowhere near the X and Y points I send it. The difference between the points sent from the PageClick function are not consistent when clicking different locations on the page.	There are two factors need to consider, if you need to add any annotations in the pages using PdfLoadedDocument and based on the position obtained from “PageClicked” event. The factors are    1.       Pixel to Point Conversion [The position values obtained from the control will be in pixels, and the annotations are expected to be added in points value if you are using PdfLoadedDocument].  2.       Zoom Factor [The position values obtained from the control will be varied with the zoom values, and the annotations are expected to be added in 100% zoom value if you are using PdfLoadedDocument]    Please find the below code snippet to achieve the proper positioning of elements.    'Get the ZoomRatio of PdfViewerControl  Dim zoomfactor As Single = WPFUserControl_PdfViewer.PdfViewer.ZoomPercentage / 100.0F    Dim clickedPosition As System.Windows.Point = mouseClickedPosition  Dim unitConvertor As PdfUnitConvertor = New PdfUnitConvertor()    'Convert the screen coordinates to Points with respect to zoom   Dim positionX As Single = unitConvertor.ConvertFromPixels(CSng((clickedPosition.X / zoomfactor)), PdfGraphicsUnit.Point)    Dim positionY As Single = unitConvertor.ConvertFromPixels(CSng((clickedPosition.Y / zoomfactor)), PdfGraphicsUnit.Point)    We have created sample for your reference, and it can be downloaded from the below link,  https://www.syncfusion.com/downloads/support/forum/165826/ze/test-210741846
I have this same issue when attempting to drag and drop text on to the pdf page. I can't find a way to get the actual page location from the screen location that is sent to the Drop event. Since this is a hosted WPF control and not a WinForms control the PointToClient method is not available. Any help on this would be greatly appreciated.	In our PdfViewerControl we do not have support to drag and drop text on to the PDF Pages. We suspect that you are drag and drop the elements and adding it to the pages with the help of “PageClicked” event. If so, please consider the above factors and let us know if it helps. Also, kindly provide us more details if our observation is different from yours.

 

Regards, 

Divya