Hands-on Rust

Theming Your Dungeon

Now that you know how to use traits to make replaceable components, let’s give the game a bit more visual flair by substituting different map themes at runtime. Your dungeon could become a forest—or anything else you can draw. Alongside varied map design, this also helps to keep players interested.

Open map_builder/mod.rs, and add a new trait defining a map theme:

MapTheming/themed/src/map_builder/mod.rs

pub trait MapTheme : Sync + Send {
    fn tile_to_render(&self, tile_type: TileType) -> FontCharType;
}

The required function signature should make sense: given a tile type, you return a character to render from the map font. Sync+Send is new.^[61] Rust emphasizes “fearless concurrency,” which means you can write ...