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https://issues.apache.org/jira/browse/PDFBOX-4449?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16756281#comment-16756281
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ASF subversion and git services commented on PDFBOX-4449:
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Commit 1852535 from Tilman Hausherr in branch 'pdfbox/trunk'
[ https://svn.apache.org/r1852535 ]
PDFBOX-4449: remove uneeded cast; apply Math.abs() to scale values
> Rotated pages produce matrix value like -0.999999999999999 instead of -1
> ------------------------------------------------------------------------
>
> Key: PDFBOX-4449
> URL: https://issues.apache.org/jira/browse/PDFBOX-4449
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 2.0.13
> Reporter: Tilman Hausherr
> Assignee: Tilman Hausherr
> Priority: Minor
> Fix For: 2.0.14, 3.0.0 PDFBox
>
>
> I was wondering why I got AffineTransform objects like
> {code}
> AffineTransform[[-4.371139E-8, 0.999999999999999, 7.96E-13],
> [0.999999999999999, 4.371139E-8, -3.4619420881E-5]]
> {code}
> which makes debugging difficult, instead of
> {code}
> AffineTransform[[0.0, 1.0, -0.0], [1.0, 0.0, -0.0]]
> {code}
> The cause is this code line in PDFRenderer:
> {code}
> graphics.rotate((float) Math.toRadians(rotationAngle));
> {code}
> Solution: removing the cast produces a nice AffineTransform object:
> {code}
> graphics.rotate(Math.toRadians(rotationAngle));
> {code}
> However... this resulted in rendering bugs in several files
> (gs-bugzilla690022-reduced-rotations.pdf,
> gs-bugzilla690022-reduced-rotations-cropbox.pdf,
> PDFJS-5811-2-p4_reduced-rotations.pdf). Researching this found that
> {{getScalingFactorX()}} and {{getScalingFactorY()}} return negative values
> which they didn't before. Using {{Math.abs()}} solves this problem and now
> two files are slightly better (lines no longer very slightly diagonal):
> PDFBOX-2376-466070.pdf page 24 and
> PDFBOX-4399-046615_p9_OCG-NoRotate-Annotations.pdf .
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