11.41 also, for what it’s worth.

Uh… yikes, I see the issue. Filing a bug for 11.50.

Ignoring all the actual drawing and focusing on just the create/prep/delete callbacks:
You’ll get
1) createOurMapLayer(), when map is first opened (or, if already opened)
2) immediate call to prep_cache()

Move aircraft on map such that map loads new scenery and you’ll get
3) another call to prep_cache() — makes sense, there are new bounds
4) call to will_be_deleted() — huh?

Continue to move aircraft and you’ll get more prep_cache() followed by will_be_deleted().

The layer provided on every call is the same, so it’s not like you’re deleting one layer to create another layer.

In the example code, will_be_deleted() simple sets global g_layer to null, but since that’s not actually used or referenced for drawing, it doesn’t really accomplish much.

Documentation says “Optional callback to inform you this layer is being deleted (due to its owning map being destroyed).” But the map isn’t being destroyed when the aircraft is merely moved (if it were, then we should be seeing another Create).

Is there a way to draw the map in an EFIS panel, and customize the terrain colors?

Thanks

Um… I’m not an OpenGL expert, but I don’t know that it’s possible to create something like an OpenGL projection to replace mapping the coordinates, just because cartographic projections are “weird.”

I’d write a wrapper function to do the projection into map coordinates once, then use it everywhere.

Thanks. I was afraid of that 🙂

I have a number of objects I want to put on the map, but they only have local coordinates. It seems like a lot of extra processing to convert them to lon/lat format first, and then one more time to map coordinates.

Would a direct projection function be a possibility in the future?

XPLMLocalToWorld() in the XPLMGraphics header converts from OpenGL coordinates to latitude, longitude, and elevation in meters MSL which you can then pass into the map projection function (XPLMMapProject()).

There is not. At present, we only support drawing fixed map layers.