Bevy Minesweeper: Safe Start

#rust #gamedev #tutorial #bevy

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We can uncover tiles, but a good minesweeper should provide a safe start uncovered zone.
Let's activate the BoardOptions parameter in our main.rs:

// main.rs
// ..
    .insert_resource(BoardOptions {
        // ..
+        safe_start: true,
        // ..
    }
// ..

This option does nothing now, we need to implement it in our board_plugin.
We want to find an empty tile and schedule its tile cover for uncovering, since we already have uncovering systems we will just insert a Uncover component on it.

We need to retrieve the current covered_tile_entity to be able to uncover it.
Since we want only one safe start we will add yet again a new argument for our spawn_tiles function.

Clippy already says it has too many already !

We will refactor it on part 9, let's get this working:

// lib.rs
// ..
fn spawn_tiles(
        // ..
+        safe_start_entity: &mut Option<Entity>,
    ) {
        // ..
        covered_tiles.insert(coordinates, entity);
+       if safe_start_entity.is_none() && *tile == Tile::Empty {
+         *safe_start_entity = Some(entity);
+       }
}

And now we change our setup_board startup system accordingly:

// lib.rs
// ..
+ let mut safe_start = None;
commands
     .spawn()
     .insert(Name::new("Board"))
// ..
Self::spawn_tiles(
    //..
+     &mut safe_start,
);
// ..
+ if options.safe_start {
+    if let Some(entity) = safe_start {
+        commands.entity(entity).insert(Uncover);
+    }
+ }
// ..