Highlighting text based on x and y co-ordinates - RadaeePDF.com
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TOPIC: Highlighting text based on x and y co-ordinates

Highlighting text based on x and y co-ordinates 1 year 1 month ago #13087

  • highc0d3r
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Hi,
We are working on a pdf viewer where we have to highlight text based on x and y axis. We are saving the x and y co-ordinates to local storage and when ever the user loads the pdf based on the x and y point we want to perform the highlight. of that text. Is there any way to do that ? If so please share us a sample code so that we can perform the highlight

Thanks

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Last edit: by highc0d3r.

Highlighting text based on x and y co-ordinates 1 year 1 month ago #13091

  • nermeen
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The most straightforward way, is to save the highlight annotation start and end char indices in PDF coordinates, and then reuse it to recreated the highlight.
You can use:
PDFPAge.ObjsGetCharIndex
to get the char index at x,y in PDF coordinates
PDFPage.AddAnnotMarkup
to recreated the highlight annotation

If you have a premium license you can use:
PDFAnnot.Export
to export an annot
PDFPage.ImportAnnot
to import an annot.

If what you want is something different, please explain with details.

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Last edit: by nermeen.

Highlighting text based on x and y co-ordinates 1 year 1 month ago #13095

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how to get the x,y co-ordinates and pass it to the PDFPAge.ObjsGetCharIndex() to get start index and end index ?

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Highlighting text based on x and y co-ordinates 1 year 1 month ago #13099

  • nermeen
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It depends on how you want to implement it, if it's based on the touch event, then x,y will be the touch point,
You only need to convert screen coordinates to PDF coordinates, using
PDFVPage.ToPDFX, ToPDFY
like in PDFVPage.SetSel the char index is calculated in PDFVSel.SetSel
In the demo project it works based on the following scenario:
  1. Click on the highlight button, which starts the selection mode
    m_view.vSelStart();
  2. Handle the selection based on touch events: PDFView.OnSelTouchBegin, OnSelTouchMove, OnSelTouchEnd
  3. Show the selection handling dialog
  4. End selection mode
    m_view.vSelEnd();

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