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https://issues.apache.org/jira/browse/PDFBOX-2692?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14337202#comment-14337202
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John Hewson commented on PDFBOX-2692:
-------------------------------------
Plug-in and extension APIs are great. But that doesn't mean subclassing.
Remember that every single public or protected method or field, and the order
in which those are called and modified are part of an implicit public contract
when subclassing is used. Far better to delegate plug-in functionality via
tightly controlled interfaces.
> Possibility to use our own and/or overwrite PageDrawer class
> ------------------------------------------------------------
>
> Key: PDFBOX-2692
> URL: https://issues.apache.org/jira/browse/PDFBOX-2692
> Project: PDFBox
> Issue Type: Wish
> Components: Rendering
> Affects Versions: 2.0.0
> Environment: JDK 1.8, Windows 7, PDF-Box - current trunk
> Reporter: Manfred Pock
> Labels: features
>
> We use PDFBox to render PDF's. Additionally, we have the posibility to add
> different kinds of annotation (stamp, marks, free text, notes..) like in a
> wysiwyg-editor. To do this, it is necessary that we paint these annotations
> on our own.
> Another reason is not to paint all parts: for example we have a pdf with an
> embedded picture. Behind the picture we have the OCR-text to this picture.
> This text is only needed for searching und should not be painted.
> Thus it would be useful to use our own derived PageDrawer. As I see there are
> some things to change.
> a.) remove the final from PagerDrawer-class.
> b.) make some global-variables (graphics, xform, pageSize...) protected,
> c.) also some methods like setRenderingHints should be protected
> d.) maybe the possibility to say to the PDFRender which PageDrawer should be
> used.
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