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https://issues.apache.org/jira/browse/PDFBOX-1960?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13921629#comment-13921629
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John Hewson commented on PDFBOX-1960:
-------------------------------------
Right, but that's the opposite of the result AffineTransform gives, here's an
updated example where I try to transform an existing CTM matrix using a new
matrix B.
System.out.println("CTM:");
AffineTransform atCTM = new AffineTransform(2.0, -0, 0, 2, 1.251E-12, 1684.0);
System.out.println(atCTM);
Matrix mCTM = new Matrix();
mCTM.setFromAffineTransform(atCTM);
System.out.println(" PDFBox Matrix" + mCTM);
System.out.println(" ");
System.out.println("B:");
AffineTransform atB = new AffineTransform(0.6, 0, 0, 0.6, 302.6, 1091.38);
System.out.println(atB);
Matrix mB = new Matrix();
mB.setFromAffineTransform(atB);
System.out.println(" PDFBox Matrix" + mB);
System.out.println("=");
atCTM.preConcatenate(atB); // atCTM = atB * atCTM
System.out.println(atCTM);
mCTM = mB.multiply(mCTM); // mCTM = mB * mCTM
System.out.println(" PDFBox Matrix" + mCTM);
> 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
> Assignee: Maruan Sahyoun
> 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]] =
> [[1.2, 0.0, 605.2000000000013], [0.0, 1.2, 3866.76]]
> PDFBox Matrix:
> [[2.0,0.0,0.0][0.0,2.0,0.0][1.251E-12,1684.0,1.0]] *
> [[0.6,0.0,0.0][0.0,0.6,0.0][302.6,1091.38,1.0]] =
> [[1.2,0.0,0.0][0.0,1.2,0.0][302.6,2101.78,1.0]]
> I suggest that we remove Matrix and replace it with AffineTransform.
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