[luatex] \pdfstartlink/\pdfextension startlink and QuadPoints

Alexander Grahn A.Grahn at hzdr.de
Thu Apr 18 12:17:14 CEST 2019


On Wed, Apr 17, 2019 at 09:50:42PM +0100, Joseph Wright wrote:
>Working on some low-level support for hyperlinks, I've come across the 
>hypdivps package (https://ctan.org/pkg/hypdvips). It's largely about 
>doing stuff in DVI mode that pdfTeX/LuaTeX in PDF mode can do anyway. 
>However, there is one PDF feature that hypdvips can use that doesn't 
>seem to show up in pdfTeX or LuaTeX: QuadPoints.
>
>Briefly, QuadPoints allow an annotation to an area defined by multiple 
>rectangles contained within the outer /Rect boundary. The usefulness 
>appears when breaking a link across lines: using QuadPoints, this is a 
>single object rather than multiple ones. pdfTeX and LuaTeX handle 
>breaking links and creation of the necessary annotations, but don't do 
>that using QuadPoints. I wonder if this was
>
>- Never considered
>- Considered but not at the time feasible (viewer support?)

Only Acrobat (Reader) seems to support QuadPoints. They were used to
produce rotated and sheared links:

https://tex.stackexchange.com/a/417546

Alexander

>- Considered but too complex to implement
>- Tried but buggy or otherwise defective
>
>Does anyone have any insight? I can see only one mention of QuadPoints 
>on the pdfTeX list 
>(https://tug.org/pipermail/pdftex/2007-February/007028.html).
>
>Joseph
>


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