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https://issues.apache.org/jira/browse/PDFBOX-1960?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13920567#comment-13920567
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Maruan Sahyoun commented on PDFBOX-1960:
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I’m not in favor of replacing Matrix with AffineTransform as one of the goals
of 2.0 is to have a core which can potentially be ported to Android. As
AffineTransform is not available on Android we’d need something there too
anyway. And Matrix is used inside PDFBox not only for drawing purposes. So I’d
propose to fix Matrix if the results are wrong.
> Matrix is wrong
> ---------------
>
> Key: PDFBOX-1960
> URL: https://issues.apache.org/jira/browse/PDFBOX-1960
> Project: PDFBox
> Issue Type: Bug
> Affects Versions: 1.8.4, 2.0.0
> Reporter: John Hewson
> Priority: Critical
>
> I've been driven insane recently by trying to get pattern fills to render
> correctly. Patterns have their own matrix which is concatenated to the CTM
> and no matter how I applied the transformation, the results were wrong.
> It turns out that org.apache.pdfbox.util.Matrix is not behaving as expected,
> here's an example from a pattern I'm working on. I performed the same
> concatenation (i.e. multiplication) using our Matrix and Java's
> AffineTransform, the results are as follows:
> Java AffineTransform:
> [[2.0, 0.0, 1.251E-12], [-0.0, 2.0, 1684.0]] *
> [[0.6, 0.0, 302.6], [0.0, 0.6, 1091.38]] =
> [[0.6,0.0,0.0][0.0,0.6,0.0][605.21,2856.34,1.0]]
> PDFBox Matrix:
> [[2.0,-0.0,0.0][0.0,2.0,0.0][1.251E-12,1684.0,1.0]] *
> [[0.3,0.0,0.0][0.0,0.300007,0.0][302.60,586.17,1.0]] =
> [[0.6,0.0,0.0][0.0,0.6,0.0][302.6,1091.38,1.0]]
> I suggest that we remove Matrix and replace it with AffineTransform.
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