dungeon: fix placeholder zombie from spawning in walls

1 files changed, 20 insertions, 0 deletions

diff --git a/dungeon/src/map.rs b/dungeon/src/map.rs
index f4a8729..6daa3c7 100644
--- a/dungeon/src/map.rs
+++ b/dungeon/src/map.rs
@@ -1,6 +1,7 @@
 //! The `map` module contains structures of the dungeon game map
 //! including the current `Floor`, and map `Tile`.
 
+use rand::{Rng, SeedableRng, rngs::StdRng};
 use strum::IntoEnumIterator;
 use strum_macros::EnumIter;
 
@@ -64,16 +65,20 @@ pub struct Floor {
 	hash: RefCell<u64>,
 	/// If the tiles are dirty (hash needs to be recomputed)
 	dirty: RefCell<bool>,
+	/// Custom rng
+	rng: StdRng,
 }
 impl Floor {
 	/// Internal constructor for `Floor`
 	fn new(tiles: Box<[Tile; TILE_COUNT]>, player_start: Pos, seed: u64) -> Self {
+		let rng = rand::rngs::StdRng::seed_from_u64(seed);
 		Self {
 			tiles,
 			player_start,
 			seed,
 			hash: RefCell::new(0),
 			dirty: RefCell::new(true),
+			rng,
 		}
 	}
 
@@ -210,6 +215,21 @@ impl Floor {
 		}
 		output
 	}
+
+	/// Returns a random open (no wall) position
+	pub fn random_pos(&mut self) -> Pos {
+		loop {
+			let x = self.rng.random_range(0..MAP_SIZE);
+			let y = self.rng.random_range(0..MAP_SIZE);
+			let Some(pos) = Pos::new(x, y) else {
+				continue;
+			};
+			if self.get(pos) != Tile::Air {
+				continue;
+			}
+			break pos;
+		}
+	}
 }
 
 impl Default for Floor {