[Libreoffice-ux-advise] [Bug 92152] Add half arrowheads

https://bugs.documentfoundation.org/show_bug.cgi?id=92152

--- Comment #8 from Regina Henschel <rb.henschel@t-online.de> ---
I have searched a little bit. "half arrowhead" is used:

(mostly drawn filled)
single electron movement
"magnetic north" symbol

(mostly drawn as line)
chemical equilibrium
UML asynchronous message

Search for black/white images and the above phrases give some useful results.

Connecting head and line should work best for a ratio of line width 0.02cm to
arrow head width 0.3cm. That is the ratio assumed in the code. Your proposal
seems a little bit off in that ratio.

In your proposal the arrow head is on the left side. Looking at the pictures I
have seen, it seems that a version with arrow head on the right side is needed
too.

Your path has two zero movements. Why?

pdf-export has an additional line on the right side. I do not know why. It
might be an error in the pdf export.

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