[okular] [Bug 407463] Improve straight line annotation style

[Tobias Deiminger]

https://bugs.kde.org/show_bug.cgi?id=407463

--- Comment #3 from Tobias Deiminger <haxtibal at posteo.de> ---
(In reply to Simone Gaiarin from comment #2)
> You are right. I have not thought about that use case.

But you're also right in that not all combinations make sense.

Let's check, how could leader line + arrow X be used?
- LL+Square: Partially overlapping. No idea what this is good for.
- LL+Circle: No visual conflict. No idea what this is good for.
- LL+Diamond: No visual conflict. No idea what this is good for.
- LL+OpenArrow: Best for dimensioning of longer distances.
- LL+ClosedArrow: Similar to OpenArrow.
- LL+None: No conflict.
- LL+Butt: Complete conflict.
- LL+ROpenArrow: Best for dimensioning of shorter distances. But we must arrows
"outside" leader for this use case (currently bug?).
- LL+RClosedArrow: Similar to ROpenArrow.
- LL+Slash: No conflict. No idea what this is good for.

In attachment 120022 I faked the text "20 mm" by using typewriter. That's
clumsy, we should better use the native caption feature of line annotations.
It's implemented in poppler as LineAnnotation::lineShowCaption, but Okular
does't expose this setting => additional item for improvement.

Unrelated: Square, circle, diamond, and closed arrows can be filled with a
color. Fill color is not yet exposed in Okular GUI => additional item for
improvement.

So there are multiple things to improve, and some of them need more
consideration. Would you mind turning this bug into a Phabricator task?

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