Polyline Vertices Specification

Please forgive my obtuseness, but I’m trying to create a PdfAnnotation
consisting of, for a simple example, an X pattern which I assume would be a
SUBTYPE of POLYLINE (one or more discontiguous line segments?). If so then I
think I’m providing the vertices incorrectly.If I specify vertices like
this:
*put(PdfName.SUBTYPE, PdfName.POLYGON);
float[] coords = { 100f, 100f, 200f, 200f, 100f, 200f, 200f, 100f };
put(PdfName.VERTICES, new PdfArray(coords));*
The following is generated:
*2 0 obj
<</C[1 1
0]/Type/Annot/Contents(contents)/Title(title)/Subtype/Polygon/Rect[99 99 201
201]/Vertices[100 100 200 200 100 200 200 100]>>*
and I get a yellow hourglass shape as expected, annotation title/contents
are loaded correctly, and the annotation appears in the Acrobat Comments
List.
But if I change POLYGON to POLYLINE (hoping to get an X instead of an
hourglass), the (almost) identical PDF code is generated (Polyline replaces
Polygon):
*2 0 obj
<</C[1 1
0]/Type/Annot/Contents(contents)/Title(title)/Subtype/Polyline/Rect[99 99
201 201]/Vertices[100 100 200 200 100 200 200 100]>>*
but a question mark appears instead of any line segments and no annotation
appears in the Comments List.
I’ve tried variations such as trying to create a PdfArray of PdfArrays,
placing all x-coords first, then all y-coords, etc. I have itext-pdfa-5.3.4
jars loaded.
Thanks very much…
- Dan



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