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https://issues.apache.org/jira/browse/PDFBOX-1991?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13940607#comment-13940607
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John Hewson commented on PDFBOX-1991:
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Perhaps, though I'd expect if we need such a measurement then it would actually
be the clipping rectangle (or similar), rather than the page height.
> Shading PaintContexts should not depend on the page height
> ----------------------------------------------------------
>
> Key: PDFBOX-1991
> URL: https://issues.apache.org/jira/browse/PDFBOX-1991
> Project: PDFBox
> Issue Type: Improvement
> Components: Rendering
> Affects Versions: 2.0.0
> Reporter: John Hewson
> Priority: Minor
> Labels: shading, shadingpattern
>
> I'd like to remove the page height parameter from PDPattern as soon as
> possible because of doubts over its safety (i.e. the current stream being
> processed may be a pattern or a form, not a page). Before I do that we need
> to remove its only use, which is...
> The page height is passed to all shading PaintContext subclasses but it is
> only used in GouraudShadingContext. However, all other drawing in PDFBox is
> done using the native PDF y-axis which is flipped via a call to
> Graphics2D#scale(0, -1) but the following code in GouraudShadingContext flips
> the y-axis:
> v.point = new Point.Double(v.point.getX(), pageHeight + xform.getTranslateY()
> - v.point.getY());
> So it seems like this could be removed and the y-axis inversion done
> elsewhere with either a Matrix, AffineTransform or Grpahics2D#scale.
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