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https://issues.apache.org/jira/browse/PDFBOX-4692?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16976022#comment-16976022
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Gili commented on PDFBOX-4692:
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It would be good to document this in the Javadoc.
As well, would it be possible to expose this logic (best-effort ascent/descent
calculation) instead of making users reimplement this outside of the API?
My goal is to parse PDF files with a known format (e.g. bank-specific,
credit-card-specific account statements) and segment its text into tabular
format. To do this, I need to know what line of text lies to the left/right,
above/below another. If I only have (X, Y) positions to go by (but no
width/height) it becomes difficult to group rows. Some columns begin slightly
above others, but end below them. If the text overlaps horizontally I treat it
as part of the same row. Any ideas?
> Document if and when PDFont.getFontDescriptor() may return null
> ---------------------------------------------------------------
>
> Key: PDFBOX-4692
> URL: https://issues.apache.org/jira/browse/PDFBOX-4692
> Project: PDFBox
> Issue Type: Improvement
> Components: Documentation
> Affects Versions: 2.0.17
> Environment: Windows 10.0.18362.418
> Reporter: Gili
> Priority: Major
> Attachments: image-2019-11-16-22-03-15-015.png
>
>
> Please document under which conditions {{PDFont.getFontDescriptor()}} may
> return null and what can be done to calculate the text ascent/descent.
> Clearly, this should be possible to calculate as the text ends up getting
> rendered.
> Background information:
> I have a PDF file (credit card statement, so it cannot be shared easily) that
> contains an embedded {{PDType3Font}} called "C0EX06Q0". When I invoke
> {{PDFont.getFontDescriptor()}} I get null.
> I have a screenshot of what it looks like.
> !image-2019-11-16-22-03-15-015.png|thumbnail!
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