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https://issues.apache.org/jira/browse/PDFBOX-4515?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16820706#comment-16820706
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Tilman Hausherr commented on PDFBOX-4515:
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RC = rich text string, not supported by PDFBox (but by Adobe) that shall be
used to generate the appearance of the annotation
DA = default appearance string. But if the /AP already exists, that one counts.
DS = default style string
I remember that I had trouble too when working on freetext annotations
appearance handling last year, see lets see my own comments and code there… the
/C color is the fill color. The last non stroking color in /DA is the stroking
color (for border) and as non stroking color (for text). But I didn't work with
rich texts so I don't know that one.
If you change characteristics of existing annotations when I recommend you
remove the appearance. Ideally you recreate it yourself. If you can't Adobe
will do it for you. Other viewers (e.g. PDFBox 2.0.* and PDF.js won't).
> 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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