Disappearing track near 180° East

[wthaem]

Describe the bug

Attached is a GPX file with a track located near but west of 180° East. This track is correctly painted with one zoom level and one map position. This track disappears when moving or zooming the map slightly.

The attached snapshot consist of 3 parts: the upper left and the lower parts are equal and show the track. The upper right snapshot was taken after slight move of the map. Here, the track can't be seen.

What have you done to circle down the problem?

To Reproduce

1. Load attached GPX file
2. Double click the track to position it on the map
3. Check if it can bee seen
4. Move map or zoom it a bit to see the track appearing resp. disappearing

Can be reproduced!

Expected behavior

The track should be always on the map

Screenshots

Attached

Attachments

GPX file + snapshots

Tracebacks

None

Desktop

• OS: Windows 10
• QMapShack Version: 1.16.1, latest dev
• Window Manager: [e.g. KDE, GNOME]

Additional context

My impression is that 180° East is somehow involved in the problem. Extreme case: Move track to the east so that right border is at 180° East.

NZ.zip

[kiozen]

This is a known problem at 180°. A correct rendering would make the already quite complex code even more complex.

A workaround is to use a projection that takes 180° as center. I do not have an EPSG code at hand but those projections exist.

[wthaem]

Thanks for the quick answer. I wasn't aware that this is known.