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https://issues.apache.org/jira/browse/PDFBOX-4313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16625081#comment-16625081
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Andreas Lehmkühler commented on PDFBOX-4313:
--------------------------------------------
Linebreaks are triggered only if the last and the current textposition don't
overlap at all. The given case is a corner case.
This is the relevant code from PDFTextStripper
{code}
private boolean overlap(float y1, float height1, float y2, float height2)
{
return within(y1, y2, .1f) || y2 <= y1 && y2 >= y1 - height1
|| y1 <= y2 && y1 >= y2 - height2;
}
{code}
These are the relevant testpositions from DrawPrintTextLocations
{code}
String[714.886,293.3178 fs=6.0 xscale=6.0 height=3.468 space=1.6680002
width=1.3319702]l
String[20.0,297.63782 fs=6.0 xscale=6.0 height=3.468 space=1.6680002
width=4.3320007]D
293.3178 <= 297.63782 && 293.3178 >= 297.63782 - 3.468 = 293.16982 -> leads to
"true" and doesn't detect the line break
{code}
I've experimented with some threshold values to make the overlap detection a
little bit more lenient. I've used 90% of the given height values.
{code}
private boolean overlap(float y1, float height1, float y2, float height2)
{
return within(y1, y2, .1f) || (y2 <= y1 && y1 - height1 - y2 < - (height1 *
0.1f))
|| (y1 <= y2 && y2 - height2 - y1 < - (height2 * 0.1f));
}
{code}
Could this be a reasonable solution? Instead of using a fixed threshold we
could introduce another parameter to change that value from the outside.
> PDFTextStripper groups unrelated chunks into words
> --------------------------------------------------
>
> Key: PDFBOX-4313
> URL: https://issues.apache.org/jira/browse/PDFBOX-4313
> Project: PDFBox
> Issue Type: Bug
> Components: Text extraction
> Affects Versions: 2.0.11
> Reporter: Emilian Bold
> Priority: Major
> Attachments: 1536938716546.pdf, PDFBOX-4313-Test.pdf,
> PDFBOX-4313-Test_sorted.txt, PDFBOX-4313-Test_unsorted.txt, PDFBOX-4313.pdf,
> PDFBOX4313Test.java, PDFBOX4313Test.java, crop-fisa-sintetica.png,
> pdfbox-words.png
>
>
> I have the text "10" and "11" and they get merged into to "1110" word.
> Coordinates are:
> 1 575.36 x 227.4 w 4.447998 h 5.736
> 1 579.752 x 227.4 w 4.447998 h 5.736
> 1 526.2 x 227.4 w 4.447998 h 5.736
> 0 530.59204 x 227.4 w 4.447998 h 5.736
> The bug is in in this PDFTextStripper chunk:
> {{
> // test if our TextPosition starts after a new word would
> be expected to start
> if (expectedStartOfNextWordX !=
> EXPECTED_START_OF_NEXT_WORD_X_RESET_VALUE
> && expectedStartOfNextWordX < positionX &&
> // only bother adding a space if the last
> character was not a space
> lastPosition.getTextPosition().getUnicode() !=
> null
> &&
> !lastPosition.getTextPosition().getUnicode().endsWith(" "))
> {
> line.add(LineItem.getWordSeparator());
> }
> }}
> which seems to add a word separator only if the next char is "after" the
> current word. It never expects that the next char might be "before" the
> current word.
> I guess this could also be framed as a RTL problem, but the PDF is a plain
> PDF, it just seems that Oracle Reports generates these chunks in the reverse
> order.
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