option for LuaForce.clear_chart to not remove tags

[thesixthroc]

For a mod I'm making, I'd like to be able to clear the chart without tags disappearing. I assume that clear_chart just nils the chart, but would it be possible to provide a way to clear the chart but leaving the tags?

[Rseding91]

Unfortunately; no. The tags are stored directly on the chart itself so if the chart is removed so are the tags.

[Stringweasel]

You could always work around it. Use find_chart_tags to find all the tags in the area you want to clear and remember them, and after you cleared the chart you add_chart_tag them all back in.

[curiosity]

You could always work around it. Use find_chart_tags to find all the tags in the area you want to clear and remember them, and after you cleared the chart you add_chart_tag them all back in.

It's more complicated than that:

Note
The chunk must be charted for a tag to be valid at that location.

[Stringweasel]

It's more complicated than that:

Ahh, thought there might be something like that lurking with Rseding said that tags are stored in the chart. Thanks for clarifying

[BenSeidel]

could always work around it. Use find_chart_tags to find all the tags in the area you want to clear and remember them, and after you cleared the chart you add_chart_tag them all back in.

This would work if you store the tags when the chunk is cleared, but restore them in the on_chunk_charted event

[thesixthroc]

There is a subtle reason I haven't tried; I want to perform this action every tick, on multiplayer. Ne pas.

[curiosity]

There is a subtle reason I haven't tried; I want to perform this action every tick, on multiplayer. Ne pas.

If you just want to get rid of the mapping of terrain, you can set map size to something very small and generate the actual map during runtime.

[Qon]

There is a subtle reason I haven't tried; I want to perform this action every tick, on multiplayer. Ne pas.

Setting a chart tag shouldn't be extremely expensive. It should be very cheap even if it's done in lua compared to chunk generation. Restoring chart tags every tick is possible to do quickly if you use tables with chunk location as index.