Markus Seifert created PDFBOX-6020:
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Summary: mix of subscript and superscript can lead to unnecessary
new lines during text extraction
Key: PDFBOX-6020
URL: https://issues.apache.org/jira/browse/PDFBOX-6020
Project: PDFBox
Issue Type: Bug
Components: Text extraction
Affects Versions: 3.0.5 PDFBox
Reporter: Markus Seifert
I'm currently upgrading our usage of PDFBox from Version 2.0.19 to 3.0.5.
Worked out fine so far but one of our JUnit-Tests failed with the new version.
During text extraction by using PDFTextStripper unnecessary line feeds were
created for a line, that contained subscript as well as superscript text. While
debugging the issue I found some changes that were made in Methode
PDFTextStripper.writePage(). I think maxYForLine, maxHeightForLine and
minYTopForLine, which are used for the overlap-check, are reset too often.
There's a check made with the value of 'Math.abs(position.getX() -
lastPosition.getTextPosition().getX())'. But I think is might have to be
changed to 'Math.abs(position.getX() - (lastPosition.getTextPosition().getX() +
lastPosition.getTextPosition().getWidth()))' to find relevant gaps.
An example-PDF can be downloaded from
[https://patentimages.storage.googleapis.com/57/b2/2f/3b5ffe86d83ef5/DE102016007628A1.pdf|https://deref-gmx.net/mail/client/1zP7-96Q_X4/dereferrer/?redirectUrl=https%3A%2F%2Fpatentimages.storage.googleapis.com%2F57%2Fb2%2F2f%2F3b5ffe86d83ef5%2FDE102016007628A1.pdf&lm]
The text-line we had problems with was on page 2: 'gin-Anion
(12-Wolframato-1-phosphat) kann durch die Summenformel [P(W12O40)]3-
beschrieben werden oder'.
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