Hands-On Game Development with Rust/

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Adding Stairs to the Map

Adding Stairs to the Map

Learn how to define stairs and add stairs to map rendering and theming systems.

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Staircases are a popular means of transport to deeper levels. Stairs can occupy a single tile, are relatively easy to render, and are intuitive.

Making and rendering staircases

Add a new Exit entry in TileType enumeration for the staircases to render staircases within our dungeon in map.rs:

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#[derive(Copy, Clone, PartialEq)]
pub enum TileType {
    Wall,
    Floor,
    Exit
}

The TileType enum is matched in map_builder/themes.rs because themes need to know how to render every tile type. Add a match branch to draw the downward staircases in map_builder/themes.rs:

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impl MapTheme for DungeonTheme {
    fn tile_to_render(&self, tile_type: TileType) -> FontCharType {
        match tile_type {
            TileType::Floor => to_cp437('.'),
            TileType::Wall => to_cp437('#'),
            TileType::Exit => to_cp437('>'),
        }
    }
}

The forest theme also needs to draw staircases, so make the same change in the forest renderer:

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impl MapTheme for ForestTheme {
    fn tile_to_render(&self, tile_type: TileType) -> FontCharType {
        match tile_type {
            TileType::Floor => to_cp437(';'),
            TileType::Wall => to_cp437('"'),
            TileType::Exit => to_cp437('>'),
        }
    }
}

Now that the game can render exit (staircase) tiles, it’s time to make them accessible to the adventurer, and perhaps the monsters too.

Update dungeon navigation

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