Chunk grid map

ArcanumLib.Gui.Map — a top-down chunk map for dialogs (land claims, zones, region pickers).

• ChunkTerrainSource (client): 32×32 terrain thumbnails per chunk column in the vanilla world-map style. Reads the client’s world-map cache (Maps/<save>.db, read-only connection) so explored-but-unloaded land shows, and renders loaded chunks live. Main thread only; keep one per session.
• GuiElementChunkGrid: LMB click/drag selects chunks (drag starting on a selected chunk deselects), RMB/MMB drag pans, wheel zooms. Base layer baked into one texture; only re-baked on change.

var terrain = new ChunkTerrainSource(capi);   // once per session, Dispose on shutdown

composer.AddChunkGrid(ElementBounds.Fixed(0, 30, 600, 560), g =>
{
    g.Terrain = terrain;
    g.CenterOn(playerChunkX, playerChunkZ);
    g.IsSelectable = (cx, cz) => !IsForeign(cx, cz);
    g.PaintOverlay = (ctx, geo) => GuiElementChunkGrid.PaintCells(ctx, geo, myChunks, fill, edge, GuiElement.scaled(2));
    g.MarkerPos = () => capi.World.Player.Entity.Pos.XYZ;
    g.SelectionChanged += () => Use(g.Selection);   // keys: ChunkTerrainSource.Key(cx, cz)
    g.ViewChanged += RequestDataForNewView;
}, "map");

ChunkGridGeometry (passed to painters) maps chunk → element pixels (X(cx), Y(cz), Cell) and world blocks → pixels (WorldX, WorldZ). PaintCells fills a chunk set and strokes only its outer border.