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https://issues.apache.org/jira/browse/PDFBOX-62?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13991590#comment-13991590
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Andreas Lehmkühler commented on PDFBOX-62:
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Thanks Juraj, I'm following the same approach to calculate the width, but mine
already looks a little bit more mature. It supports the correct
encoding/mapping, monospaced fonts and I know where these magic factor comes
from (it's 1/unitsPerEm , a value which can be found in the head table) ;-)
We have to see what to do with the fonts, first of all I'd like to add the
calculation part.
> Incorrect (zero) character widths returned in some docs
> -------------------------------------------------------
>
> Key: PDFBOX-62
> URL: https://issues.apache.org/jira/browse/PDFBOX-62
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering, Text extraction
> Assignee: Andreas Lehmkühler
> Attachments: 5542.pdf, PDFBOX-2059_PDTrueTypeFont.diff,
> PDTrueTypeFont.diff, pdfbox-2006-zerowidth.pdf-1.png,
> pdfbox-62-zerowidth.pdf-1.png
>
>
> [imported from SourceForge]
> http://sourceforge.net/tracker/index.php?group_id=78314&atid=552832&aid=1216674
> Originally submitted by tamirhassan on 2005-06-07 13:42.
> For certain PDF documents (such as the one attached)
> the character/string widths (as obtained e.g. by the
> PDFont.getStringWidth method) are not returned
> correctly, i.e. they appear to be correct for punctuation
> characters but are zero for alphanumeric characters.
> It seems as if these alphanumeric characters are NOT
> within PDFont.firstChar and PDFont.lastChar in the
> Type 1 font. The method therefore attempts to obtain
> the font widths from the AFM (font metric) file, but fails
> (silently) with a 'resource is null' logline message.
> (Note that this problem doesn't seem to occur with Type
> 1 fonts in other documents.)
> A more detailed discussion regarding this issue can be
> found in this link:
> http://sourceforge.net/forum/forum.php?
> thread_id=1260349&forum_id=267205
> Thanks in advance for any help that can be obtained,
> Tam
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