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https://issues.apache.org/jira/browse/PDFBOX-3353?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16341268#comment-16341268
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Tilman Hausherr commented on PDFBOX-3353:
-----------------------------------------
I played around a bit with line arrows... here are my observations for a double
arrow line 100,600 to 500,600 with width 10, see attached file
Line-Annotation-OpenArrow-w10-AP.pdf:
{code:java}
10 w
0 G
q
S
1 0 0 1 0 0 cm
q
0 g
0 G
1 w
BT
/Helv 9 Tf
0 g
269.863 597.394 Td
(Circle->Square) Tj
ET
Q
110 600 m
259.8628 600 l
S
340.1372 600 m
490 600 l
S
Q
187.9419 554.9995 m
109.9999 600 l
187.9419 645.0005 l
S
412.0581 645.0005 m
490.0001 600 l
412.0581 554.9995 l
S
{code}
- line is shortened by the width when there is an arrow
- shorter lines => inverted arrow (won't bother with it for now)
- font size 9, not 12
- peak of the arrow is at shortened line endpoint
- the gap between lines and text is the line width
- length of arrow side about 10 x the line width
- angle is about 30°, but a test with asin/acos gets weird results???
- x = cos = 0.779419 => acos = 38.79°
- y = sin = 0.450005 => asin = 26.74°
- this would mean that the coordinate is not really on the circle... I tried
this:
[https://stackoverflow.com/questions/15994194/how-to-convert-x-y-coordinates-to-an-angle]
- Math.toDegrees(Math.atan2(45.0005, 187.9419 - 109.9999)) result is 30°.
- However there is a difference, especially in the y value of my calculations.
My y delta is 50, Adobe has 45.
The result is now much closer to what Adobe does (especially for the file from
PDFBOX-2019).
> 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 PDFBox
> Reporter: Tilman Hausherr
> Priority: Major
> Labels: Annotations
> Attachments: AnnotationSample.Standard.pdf,
> CTAN-example-Annotations-rot270.pdf, CTAN-example-Annotations.pdf,
> Line-Annotation-OpenArrow-w10-AP.pdf, PDFBOX-2019-Annotations.pdf,
> PDFBOX-2898-Annotations.pdf, PDFBOX-3353-highlight-noAP-001796-p1.pdf,
> PDFBOX-3353-highlight-noAP.pdf, PDFJS-7115-indirect-rect.pdf,
> ShowAnnotation-4.java, ShowAnnotation-5.java, ShowAnnotation-6.java,
> SquareAnnotations.pdf, annots.pdf, gs-bugzilla-693664-AnnotationTest.pdf,
> line_dimension_appearance_stream-noAP.pdf,
> line_dimension_appearance_stream.pdf, pdf_commenting_new.pdf,
> showAnnotation.java, 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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