[jira] [Created] (PDFBOX-4449) Rotated pages produce matrix value like -0.999999999999999 instead of -1

["Tilman Hausherr (JIRA)" <ji...@apache.org>]

Tilman Hausherr created PDFBOX-4449:
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             Summary: 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
             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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