feat: tunnel implementation, pathfinding debug mode

src/constants.rs

@@ -32,6 +32,8 @@ pub enum MapTile {
     PowerPellet,
     /// A starting position for an entity.
     StartingPosition(u8),
+    /// A tunnel tile.
+    Tunnel,
 }
 
 /// The raw layout of the game board, as a 2D array of characters.
@@ -50,7 +52,7 @@ pub const RAW_BOARD: [&str; BOARD_HEIGHT as usize] = [
     "     #.##    1     ##.#     ",
     "     #.## ###==### ##.#     ",
     "######.## #      # ##.######",
-    "      .   #2 3 4 #   .      ",
+    "T     .   #2 3 4 #   .     T",
     "######.## #      # ##.######",
     "     #.## ######## ##.#     ",
     "     #.##          ##.#     ",

src/game.rs

@@ -2,6 +2,7 @@
 use std::cell::RefCell;
 use std::rc::Rc;
 
+use rand::seq::IteratorRandom;
 use sdl2::image::LoadTexture;
 use sdl2::keyboard::Keycode;
 use sdl2::render::{Texture, TextureCreator};
@@ -34,6 +35,13 @@ static GHOST_EYES_TEXTURE_DATA: &[u8] = include_bytes!("../assets/32/ghost_eyes.
 ///
 /// This struct contains all the information necessary to run the game, including
 /// the canvas, textures, fonts, game objects, and the current score.
+#[derive(PartialEq, Eq, Clone, Copy)]
+pub enum DebugMode {
+    None,
+    Grid,
+    Pathfinding,
+}
+
 pub struct Game<'a> {
     canvas: &'a mut Canvas<Window>,
     map_texture: Texture<'a>,
@@ -42,7 +50,7 @@ pub struct Game<'a> {
     font: Font<'a, 'static>,
     pacman: Rc<RefCell<Pacman<'a>>>,
     map: Rc<std::cell::RefCell<Map>>,
-    debug: bool,
+    debug_mode: DebugMode,
     score: u32,
     audio: Audio,
     // Add ghost
@@ -120,7 +128,7 @@ impl Game<'_> {
         Game {
             canvas,
             pacman,
-            debug: false,
+            debug_mode: DebugMode::None,
             map,
             map_texture,
             pellet_texture,
@@ -144,7 +152,11 @@ impl Game<'_> {
 
         // Toggle debug mode
         if keycode == Keycode::Space {
-            self.debug = !self.debug;
+            self.debug_mode = match self.debug_mode {
+                DebugMode::None => DebugMode::Grid,
+                DebugMode::Grid => DebugMode::Pathfinding,
+                DebugMode::Pathfinding => DebugMode::None,
+            };
         }
 
         // Reset game
@@ -173,18 +185,40 @@ impl Game<'_> {
         // Reset the score
         self.score = 0;
 
-        // Reset Pac-Man position
+        // Reset Pacman position
         let mut pacman = self.pacman.borrow_mut();
         pacman.pixel_position = Map::cell_to_pixel((1, 1));
         pacman.cell_position = (1, 1);
+        pacman.in_tunnel = false;
+        pacman.direction = Direction::Right;
+        pacman.next_direction = None;
+        pacman.stopped = false;
 
-        // Reset ghost positions
-        self.blinky.set_mode(crate::ghost::GhostMode::House);
-        self.blinky.pixel_position = Map::cell_to_pixel((13, 11));
-        self.blinky.cell_position = (13, 11);
-        self.blinky.direction = Direction::Left;
+        // Reset ghost positions and mode
+        let mut rng = rand::rng();
+        let map = self.map.borrow();
+        let mut valid_positions = vec![];
+        for x in 1..(crate::constants::BOARD_WIDTH - 1) {
+            for y in 1..(crate::constants::BOARD_HEIGHT - 1) {
+                let tile_option = map.get_tile((x as i32, y as i32));
 
-        event!(tracing::Level::INFO, "Game reset - map and score cleared");
+                if let Some(tile) = tile_option {
+                    match tile {
+                        MapTile::Empty | MapTile::Pellet | MapTile::PowerPellet => {
+                            valid_positions.push((x, y));
+                        }
+                        _ => {}
+                    }
+                }
+            }
+        }
+        if let Some(&(gx, gy)) = valid_positions.iter().choose(&mut rng) {
+            self.blinky.pixel_position = Map::cell_to_pixel((gx, gy));
+            self.blinky.cell_position = (gx, gy);
+            self.blinky.in_tunnel = false;
+            self.blinky.direction = Direction::Left;
+            self.blinky.mode = crate::ghost::GhostMode::Chase;
+        }
     }
 
     /// Advances the game by one tick.
@@ -275,7 +309,7 @@ impl Game<'_> {
         self.render_ui();
 
         // Draw the debug grid
-        if self.debug {
+        if self.debug_mode == DebugMode::Grid {
             for x in 0..BOARD_WIDTH {
                 for y in 0..BOARD_HEIGHT {
                     let tile = self
@@ -294,6 +328,7 @@ impl Game<'_> {
                             MapTile::Pellet => Some(Color::RED),
                             MapTile::PowerPellet => Some(Color::MAGENTA),
                             MapTile::StartingPosition(_) => Some(Color::GREEN),
+                            MapTile::Tunnel => Some(Color::CYAN),
                         };
                     }
 
@@ -308,6 +343,19 @@ impl Game<'_> {
             self.draw_cell((next_cell.0 as u32, next_cell.1 as u32), Color::YELLOW);
         }
 
+        // Pathfinding debug mode
+        if self.debug_mode == DebugMode::Pathfinding {
+            // Show the current path for Blinky
+            if let Some((path, _)) = self.blinky.get_path_to_target({
+                let (tx, ty) = self.blinky.get_target_tile();
+                (tx as u32, ty as u32)
+            }) {
+                for &(x, y) in &path {
+                    self.draw_cell((x, y), Color::YELLOW);
+                }
+            }
+        }
+
         // Present the canvas
         self.canvas.present();
     }

src/ghost.rs

@@ -1,4 +1,4 @@
-use pathfinding::prelude::astar;
+use pathfinding::prelude::dijkstra;
 use sdl2::{
     pixels::Color,
     render::{Canvas, Texture},
@@ -11,7 +11,7 @@ use rand::Rng;
 
 use crate::{
     animation::AnimatedTexture,
-    constants::{MapTile, BOARD_OFFSET, CELL_SIZE},
+    constants::{MapTile, BOARD_OFFSET, BOARD_WIDTH, CELL_SIZE},
     direction::Direction,
     entity::Entity,
     map::Map,
@@ -67,8 +67,6 @@ pub struct Ghost<'a> {
     pub mode: GhostMode,
     /// The type/personality of this ghost
     pub ghost_type: GhostType,
-    /// Whether the ghost is currently blue (frightened)
-    pub is_blue: bool,
     /// Reference to the game map
     pub map: Rc<RefCell<Map>>,
     /// Reference to Pac-Man for targeting
@@ -81,6 +79,8 @@ pub struct Ghost<'a> {
     body_sprite: AnimatedTexture<'a>,
     /// Ghost eyes sprite
     eyes_sprite: AnimatedTexture<'a>,
+    /// Whether the ghost is currently in a tunnel
+    pub in_tunnel: bool,
 }
 
 impl Ghost<'_> {
@@ -103,13 +103,13 @@ impl Ghost<'_> {
             direction: Direction::Left,
             mode: GhostMode::Chase,
             ghost_type,
-            is_blue: false,
             map,
             pacman,
             speed: 3,
             modulation: SimpleTickModulator::new(1.0),
             body_sprite,
             eyes_sprite: AnimatedTexture::new(eyes_texture, 1, 4, 32, 32, Some((-4, -4))),
+            in_tunnel: false,
         }
     }
 
@@ -150,14 +150,23 @@ impl Ghost<'_> {
     }
 
     /// Calculates the path to the target tile using the A* algorithm.
-    fn get_path_to_target(&self, target: (u32, u32)) -> Option<(Vec<(u32, u32)>, u32)> {
+    pub fn get_path_to_target(&self, target: (u32, u32)) -> Option<(Vec<(u32, u32)>, u32)> {
         let start = self.cell_position;
         let map = self.map.borrow();
 
-        astar(
+        dijkstra(
             &start,
             |&p| {
                 let mut successors = vec![];
+                let tile = map.get_tile((p.0 as i32, p.1 as i32));
+                // Tunnel wrap: if currently in a tunnel, add the opposite exit as a neighbor
+                if let Some(MapTile::Tunnel) = tile {
+                    if p.0 == 0 {
+                        successors.push(((BOARD_WIDTH - 2, p.1), 1));
+                    } else if p.0 == BOARD_WIDTH - 1 {
+                        successors.push(((1, p.1), 1));
+                    }
+                }
                 for dir in &[
                     Direction::Up,
                     Direction::Down,
@@ -167,16 +176,14 @@ impl Ghost<'_> {
                     let (dx, dy) = dir.offset();
                     let next_p = (p.0 as i32 + dx, p.1 as i32 + dy);
                     if let Some(tile) = map.get_tile(next_p) {
-                        if tile != MapTile::Wall {
-                            successors.push(((next_p.0 as u32, next_p.1 as u32), 1));
+                        if tile == MapTile::Wall {
+                            continue;
                         }
+                        successors.push(((next_p.0 as u32, next_p.1 as u32), 1));
                     }
                 }
                 successors
             },
-            |&p| {
-                ((p.0 as i32 - target.0 as i32).abs() + (p.1 as i32 - target.1 as i32).abs()) as u32
-            },
             |&p| p == target,
         )
     }
@@ -304,25 +311,53 @@ impl Entity for Ghost<'_> {
                 (self.pixel_position.1 as u32 / CELL_SIZE) - BOARD_OFFSET.1,
             );
 
-            // Pathfinding logic
-            let target_tile = self.get_target_tile();
-            if let Some((path, _)) =
-                self.get_path_to_target((target_tile.0 as u32, target_tile.1 as u32))
-            {
-                if path.len() > 1 {
-                    let next_move = path[1];
-                    let (x, y) = self.cell_position;
-                    let dx = next_move.0 as i32 - x as i32;
-                    let dy = next_move.1 as i32 - y as i32;
-                    self.direction = if dx > 0 {
-                        Direction::Right
-                    } else if dx < 0 {
-                        Direction::Left
-                    } else if dy > 0 {
-                        Direction::Down
-                    } else {
-                        Direction::Up
-                    };
+            let current_tile = self
+                .map
+                .borrow()
+                .get_tile((self.cell_position.0 as i32, self.cell_position.1 as i32))
+                .unwrap_or(MapTile::Empty);
+            if current_tile == MapTile::Tunnel {
+                self.in_tunnel = true;
+            }
+
+            // Tunnel logic: if in tunnel, force movement and prevent direction change
+            if self.in_tunnel {
+                // If out of bounds, teleport to the opposite side and exit tunnel
+                if self.cell_position.0 == 0 {
+                    self.cell_position.0 = BOARD_WIDTH - 2;
+                    self.pixel_position =
+                        Map::cell_to_pixel((self.cell_position.0, self.cell_position.1));
+                    self.in_tunnel = false;
+                } else if self.cell_position.0 == BOARD_WIDTH - 1 {
+                    self.cell_position.0 = 1;
+                    self.pixel_position =
+                        Map::cell_to_pixel((self.cell_position.0, self.cell_position.1));
+                    self.in_tunnel = false;
+                } else {
+                    // While in tunnel, do not allow direction change
+                    // and always move in the current direction
+                }
+            } else {
+                // Pathfinding logic (only if not in tunnel)
+                let target_tile = self.get_target_tile();
+                if let Some((path, _)) =
+                    self.get_path_to_target((target_tile.0 as u32, target_tile.1 as u32))
+                {
+                    if path.len() > 1 {
+                        let next_move = path[1];
+                        let (x, y) = self.cell_position;
+                        let dx = next_move.0 as i32 - x as i32;
+                        let dy = next_move.1 as i32 - y as i32;
+                        self.direction = if dx > 0 {
+                            Direction::Right
+                        } else if dx < 0 {
+                            Direction::Left
+                        } else if dy > 0 {
+                            Direction::Down
+                        } else {
+                            Direction::Up
+                        };
+                    }
                 }
             }
 

src/map.rs

@@ -2,6 +2,18 @@
 use crate::constants::{MapTile, BOARD_OFFSET, CELL_SIZE};
 use crate::constants::{BOARD_HEIGHT, BOARD_WIDTH};
 
+#[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
+pub struct Position(pub u32, pub u32);
+
+impl Position {
+    pub fn as_i32(&self) -> (i32, i32) {
+        (self.0 as i32, self.1 as i32)
+    }
+    pub fn wrapping_add(&self, dx: i32, dy: i32) -> Position {
+        Position((self.0 as i32 + dx) as u32, (self.1 as i32 + dy) as u32)
+    }
+}
+
 /// The game map.
 ///
 /// The map is represented as a 2D array of `MapTile`s. It also stores a copy of
@@ -41,6 +53,7 @@ impl Map {
                     '.' => MapTile::Pellet,
                     'o' => MapTile::PowerPellet,
                     ' ' => MapTile::Empty,
+                    'T' => MapTile::Tunnel,
                     c @ '0' | c @ '1' | c @ '2' | c @ '3' | c @ '4' => {
                         MapTile::StartingPosition(c.to_digit(10).unwrap() as u8)
                     }

src/pacman.rs

@@ -11,7 +11,7 @@ use tracing::event;
 use crate::{
     animation::AnimatedTexture,
     constants::MapTile,
-    constants::{BOARD_OFFSET, CELL_SIZE},
+    constants::{BOARD_OFFSET, BOARD_WIDTH, CELL_SIZE},
     direction::Direction,
     entity::Entity,
     map::Map,
@@ -35,6 +35,7 @@ pub struct Pacman<'a> {
     speed: u32,
     modulation: SimpleTickModulator,
     sprite: AnimatedTexture<'a>,
+    pub in_tunnel: bool,
 }
 
 impl Pacman<'_> {
@@ -60,6 +61,7 @@ impl Pacman<'_> {
             stopped: false,
             modulation: SimpleTickModulator::new(1.0),
             sprite: AnimatedTexture::new(atlas, 2, 3, 32, 32, Some((-4, -4))),
+            in_tunnel: false,
         }
     }
 
@@ -171,42 +173,58 @@ impl Entity for Pacman<'_> {
         // Pac-Man can only change direction when he is perfectly aligned with the grid.
         let can_change = self.internal_position_even() == (0, 0);
 
-        if let Some(next_direction) = self.next_direction {
-            if next_direction == self.direction.opposite() {
-                let next_tile_position = self.next_cell(Some(next_direction));
+        if can_change {
+            self.cell_position = (
+                (self.pixel_position.0 as u32 / CELL_SIZE) - BOARD_OFFSET.0,
+                (self.pixel_position.1 as u32 / CELL_SIZE) - BOARD_OFFSET.1,
+            );
+
+            let current_tile = self
+                .map
+                .borrow()
+                .get_tile((self.cell_position.0 as i32, self.cell_position.1 as i32))
+                .unwrap_or(MapTile::Empty);
+            if current_tile == MapTile::Tunnel {
+                self.in_tunnel = true;
+            }
+
+            // Tunnel logic: if in tunnel, force movement and prevent direction change
+            if self.in_tunnel {
+                // If out of bounds, teleport to the opposite side and exit tunnel
+                if self.cell_position.0 == 0 {
+                    self.cell_position.0 = BOARD_WIDTH - 2;
+                    self.pixel_position =
+                        Map::cell_to_pixel((self.cell_position.0 + 1, self.cell_position.1));
+                    self.in_tunnel = false;
+                } else if self.cell_position.0 == BOARD_WIDTH - 1 {
+                    self.cell_position.0 = 1;
+                    self.pixel_position =
+                        Map::cell_to_pixel((self.cell_position.0 - 1, self.cell_position.1));
+                    self.in_tunnel = false;
+                } else {
+                    // While in tunnel, do not allow direction change
+                    // and always move in the current direction
+                }
+            } else {
+                // Handle direction change as normal
+                self.handle_direction_change();
+
+                // Check if the next tile in the current direction is a wall.
+                let next_tile_position = self.next_cell(None);
                 let next_tile = self
                     .map
                     .borrow()
                     .get_tile(next_tile_position)
                     .unwrap_or(MapTile::Empty);
 
-                if next_tile != MapTile::Wall {
-                    self.direction = next_direction;
-                    self.next_direction = None;
+                if !self.stopped && next_tile == MapTile::Wall {
+                    self.stopped = true;
+                } else if self.stopped && next_tile != MapTile::Wall {
+                    self.stopped = false;
                 }
             }
         }
 
-        if can_change {
-            self.handle_direction_change();
-
-            // Check if the next tile in the current direction is a wall.
-            let next_tile_position = self.next_cell(None);
-            let next_tile = self
-                .map
-                .borrow()
-                .get_tile(next_tile_position)
-                .unwrap_or(MapTile::Empty);
-
-            if !self.stopped && next_tile == MapTile::Wall {
-                event!(tracing::Level::DEBUG, "Wall collision. Stopping.");
-                self.stopped = true;
-            } else if self.stopped && next_tile != MapTile::Wall {
-                event!(tracing::Level::DEBUG, "Wall collision resolved. Moving.");
-                self.stopped = false;
-            }
-        }
-
         if !self.stopped {
             if self.modulation.next() {
                 let speed = self.speed as i32;