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https://issues.apache.org/jira/browse/PDFBOX-3353?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16145761#comment-16145761
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Tilman Hausherr commented on PDFBOX-3353:
-----------------------------------------
Thanks for sharing... However I can't use that code directly because you you're
using a different strategy than I did, you're drawing the arrow at the native
angle, i.e. you're not using my "lazy" strategy (rotate first to avoid any
thinking about the line angle). But your thoughts are still useful.
I think I understand what you do:
- shorten the line by 1 unit for the arrow tip
- have each arrow side line 30° from the main line.
Your argument about the arrow tip is of course correct. And my rendering of
PDFBOX-2019 is obviously not good.
To get a sharp angle we need to draw the path in a single step, i.e. move,
line, line, instead of move, line, move, line. My code would change to
{code}
if (PDAnnotationLine.LE_OPEN_ARROW.equals(line.getStartPointEndingStyle()))
{
cs.moveTo(6, 3);
cs.lineTo(0, 0);
cs.lineTo(6, -3);
cs.stroke();
}
if (PDAnnotationLine.LE_OPEN_ARROW.equals(line.getEndPointEndingStyle()))
{
cs.moveTo(lineLength - 6, 3);
cs.lineTo(lineLength, 0);
cs.lineTo(lineLength - 6, -3);
cs.stroke();
}
{code}
Re the rendering of PDFBOX-2019, I suspect the width plays a role too in the
shortening. I haven't had much time recently... What one could do is to create
various horizontal line annotations and see what Adobe does.
> Create appearance streams for annotations
> -----------------------------------------
>
> Key: PDFBOX-3353
> URL: https://issues.apache.org/jira/browse/PDFBOX-3353
> Project: PDFBox
> Issue Type: Task
> Components: PDModel, Rendering
> Affects Versions: 1.8.12, 2.0.0, 2.0.1, 2.0.2, 3.0.0
> Reporter: Tilman Hausherr
> Labels: Annotations
> Attachments: line_dimension_appearance_stream-noAP.pdf,
> line_dimension_appearance_stream.pdf,
> PDFBOX-3353-highlight-noAP-001796-p1.pdf, PDFBOX-3353-highlight-noAP.pdf,
> ShowAnnotation-4.java, showAnnotation.java, SquareAnnotations.pdf,
> text_markup_ap_test.pdf
>
>
> Create appearance streams for annotations when missing.
> I'll start by replacing current code for Ink and Link annotations.
> Good example PDFs:
> http://www.pdfill.com/example/pdf_commenting_new.pdf
> https://github.com/mozilla/pdf.js/issues/6810
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