Transitions: name sometimes overlaps with other elements

[ebousse]

Describe the bug

In a state machine diagram, it sometimes happens that transition names are overlapping other graphical elements, making them unreadable.

(This is a similar issue as this older one: #2025)

To Reproduce

Steps to reproduce the behavior:

1. Download and open this Gaphor project: monopoly.zip
2. Open State machine "Case terrain"
3. Look at the transition between Vide and Hypothéqué

Expected behavior

I expect the transition name to not overlap, which here should be OK given the available space around.

Screenshots

OS

• Linux (Fedora 39)
• macOS
• Windows

Version

Version of Gaphor: 2.22.1 (Flatpak)

[amolenaar]

Hi @ebousse,

The placement algorithm is pretty simple. With this angle it assumes the arrow is attached to the left side.

We have a way to find out which side a relation is connected to, so we can probably make it a little smarter. (we did not have that when the original algorithm was written)

[ebousse]

The placement algorithm is pretty simple. With this angle it assumes the arrow is attached to the left side.

This explains a lot! Thanks, as a workaround I'll keep this fact in mind when placing my arrows.

We have a way to find out which side a relation is connected to, so we can probably make it a little smarter. (we did not have that when the original algorithm was written)

Sounds great, looking forward to it :)

[marek-piirikivi]

That's rough problem to solve automatically. I remember @sz332 proposed somewhere to make the names draggable so you can reposition them more freely. Maybe we want to pursue this?