feat: show a mid point for linear elements

[ad1992]

midpoint.mp4

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[maielo]

🔥 🔥 🔥 looking forward for this one !

[ad1992]

🔥 🔥 🔥 looking forward for this one !

On the way 😉

[dwelle]

The goal is for the mid-point to be "phantom" until you click/drag on it. This way there's no actual point, unlike in current version where the point is always there, making the arrow 3-point from the start.

And in the future we may also allow adding more midpoints "forever" (until a given threshold).

Figma:

We should also decide whether double-clicking on a point outside the editor should remove it.

[zsviczian]

Behavior is different if I drag the arrow (the mid point is added) and if I click, move the pointer and double click (the mid point is not added).

I agree with @dwelle that the mid-point should be invisible until used. If line sloppiness is cartoonist the mid-point breaks the continuity of the line which stylistically does not look very nice.
I also agree that this would make sense if mid-points would continue to sub sections of the line. In its current form I don't yet see the value add of this feature, rather the contrary, because of the line break effect as shown on the video. If you want a multi-point line you can click-move-click-move-doubleclick.

2022-08-04.13-34-06.mp4

.

[ad1992]

@zsviczian yes the point will be a phantom point. As for the initial release it will be just on mid of linear elements.
I am not sure if we should allow deleting via double click outside editor once added, I am thinking we can leave it for the line editor for deleting the points but its still open for discussion.
As per mid points between segments, we will be discussing that post the initial release.