Gazetteer labels misplaced when degrees-towards-zenith are negative

[martignoni]

Expected Behaviour

When degrees-towards-zenith < 0 in gazetteer file, gazetteer labels should be displayed below the lower end of the line pointing to the polygon line, instead of above.

Actual Behaviour

Gazetteer labels are displayed above the lower end of the line pointing to the polygon line, which causes legibility issues when label's angle is eg. 45° (see screenshot).

Steps to reproduce

System

• Stellarium version: Stellarium 25.0+ (v25.0.61-a8d2146 [master]) and Stellarium 24.4 for macOS 11.0+; Qt6; universal
• Operating system: macOS Sequioa 15.3.1
• Graphics Card: Radeon Pro 580X 8 Go and Apple M2 GPU
• Screen type: Any (not applicable)

Landscape

1. Add gazetteer file attached to a landscape folder (remove .txt from file name).
2. Re-launch Stellarium.
3. Select landscape with above mentioned gazetteer file.
4. Set "Text angle" of labels to 45°.
5. Observe that labels are displayed above the lower end of the line pointing to the polygon line

Logfile

Log file shows no problem. See attachment.

gazetteer.en.utf8.txt

log.txt

[github-actions]

Hello @martignoni!

Thank you for suggesting this enhancement.

[gzotti]

Label was never planned below horizon. Not difficult, just not urgent.

[martignoni]

Label was never planned below horizon.

This is indeed what I had imagined.

Not difficult, just not urgent.

I'll try to give it a look.