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https://issues.apache.org/jira/browse/PDFBOX-4515?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16819393#comment-16819393
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Tilman Hausherr commented on PDFBOX-4515:
-----------------------------------------

OK, so getting the callout line works. About the rectangle - I see now that the 
rectangle is the outer rectangle, i.e. with everything. So getting the inner 
rectangle is trickier. I think the /RD entry plays a role. You can get that one 
with {{getRectDifference()}}. From what I see, to get the lower values of the 
inner rectangle you add the first two /RD values to the outer rectangle, and to 
get the higher values, you substract the last two /RD values. To see what I 
mean, open the file with PDFDebugger.

> Support for Add Text Callout Annotation tool.
> ---------------------------------------------
>
>                 Key: PDFBOX-4515
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-4515
>             Project: PDFBox
>          Issue Type: Wish
>          Components: PDModel
>    Affects Versions: 2.0.15
>            Reporter: Kaushlendra Singh
>            Priority: Major
>              Labels: Annotations
>         Attachments: Screen Shot 2019-04-15 at 5.39.31 PM.png, myPdf.pdf
>
>
> I am trying to extract information related to "Add Text Callout" annotation 
> tool from pdf. I get to know from initial research that it's a "FreeText" 
> type annotation and it's intent is "FreeTextCallout". But I am unable to 
> figure out like how can I get the rectangle info for both the box and arrow 
> attached to it. I am able to get the bounding box which encloses both the 
> markups. I don't know it's already implemented or not.



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