[jira] [Updated] (PDFBOX-1960) Matrix and AffineTransform have confusing differences

["John Hewson (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PDFBOX-1960?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

John Hewson updated PDFBOX-1960:
--------------------------------

    Summary: Matrix and AffineTransform have confusing differences  (was: Matrix and AffineTransform differ)

> Matrix and AffineTransform have confusing differences
> -----------------------------------------------------
>
>                 Key: PDFBOX-1960
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-1960
>             Project: PDFBox
>          Issue Type: Improvement
>    Affects Versions: 2.0.0
>            Reporter: John Hewson
>            Assignee: Maruan Sahyoun
>            Priority: Minor
>
> 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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