Going berserk!

src/main.rs

@@ -36,6 +36,8 @@ const MAX_ROOMS: i32 = 30;
 const FOV_ALGO: FovAlgorithm = FovAlgorithm::Basic;
 const FOV_LIGHT_WALLS: bool = true;
 const TORCH_RADIUS: i32 = 10;
+const MAX_ROOM_MONSTERS: i32 = 3;
+const PLAYER: usize = 0;
 
 struct Tcod {
   root: Root,
@@ -49,18 +51,21 @@ struct Object {
   y: i32,
   char: char,
   color: Color,
+  name: String,
+  blocks: bool,
+  alive: bool,
 }
 
 impl Object {
-  pub fn new(x: i32, y: i32, char: char, color: Color) -> Self {
-    Object { x, y, char, color }
-  }
-
-  // Move by given amount, if the destination is not blocked
-  pub fn move_by(&mut self, dx: i32, dy: i32, game: &Game) {
-    if !game.map[(self.x + dx) as usize][(self.y + dy) as usize].blocked {
-      self.x += dx;
-      self.y += dy;
+  pub fn new(x: i32, y: i32, char: char, name: &str, color: Color, blocks: bool) -> Self {
+    Object {
+      x: x,
+      y: y,
+      char: char,
+      color: color,
+      name: name.into(),
+      blocks: blocks,
+      alive: false,
     }
   }
 
@@ -69,6 +74,15 @@ impl Object {
     con.set_default_foreground(self.color);
     con.put_char(self.x, self.y, self.char, BackgroundFlag::None);
   }
+
+  pub fn pos(&self) -> (i32, i32) {
+    (self.x, self.y)
+  }
+
+  pub fn set_pos(&mut self, x: i32, y: i32) {
+    self.x = x;
+    self.y = y;
+  }
 }
 
 #[derive(Clone, Copy, Debug)]
@@ -132,34 +146,60 @@ impl Rect {
   }
 }
 
-fn handle_keys(tcod: &mut Tcod, game: &Game, player: &mut Object) -> bool {
+#[derive(Clone, Copy, Debug, PartialEq)]
+enum PlayerAction {
+  TookTurn,
+  DidntTakeTurn,
+  Exit,
+}
+
+fn handle_keys(tcod: &mut Tcod, game: &Game, objects: &mut Vec<Object>) -> PlayerAction {
   use tcod::input::Key;
   use tcod::input::KeyCode::*;
+  use PlayerAction::*;
 
   let key = tcod.root.wait_for_keypress(true);
-  match key {
-    Key {
-      code: Enter,
-      alt: true,
-      ..
-    } => {
+  let player_alive = objects[PLAYER].alive;
+
+  match (key, key.text(), player_alive) {
+    (
+      Key {
+        code: Enter,
+        alt: true,
+        ..
+      },
+      _,
+      _,
+    ) => {
       // Alt+Enter: toggle fullscreen
       let fullscreen = tcod.root.is_fullscreen();
       tcod.root.set_fullscreen(!fullscreen);
+      DidntTakeTurn
     }
-    Key { code: Escape, .. } => return true, // exit game
+    (Key { code: Escape, .. }, _, _) => Exit, // exit game
 
-    Key { code: Up, .. } => player.move_by(0, -1, game),
-    Key { code: Down, .. } => player.move_by(0, 1, game),
-    Key { code: Left, .. } => player.move_by(-1, 0, game),
-    Key { code: Right, .. } => player.move_by(1, 0, game),
+    (Key { code: Up, .. }, _, true) => {
+      player_move_or_attack(0, -1, game, objects);
+      TookTurn
+    }
+    (Key { code: Down, .. }, _, true) => {
+      player_move_or_attack(0, 1, game, objects);
+      TookTurn
+    }
+    (Key { code: Left, .. }, _, true) => {
+      player_move_or_attack(-1, 0, game, objects);
+      TookTurn
+    }
+    (Key { code: Right, .. }, _, true) => {
+      player_move_or_attack(1, 0, game, objects);
+      TookTurn
+    }
 
-    _ => {}
+    _ => DidntTakeTurn,
   }
-  false
 }
 
-fn make_map(player: &mut Object) -> Map {
+fn make_map(objects: &mut Vec<Object>) -> Map {
   // Fill the map with unblocked tiles
   let mut map = vec![vec![Tile::wall(); MAP_HEIGHT as usize]; MAP_WIDTH as usize];
 
@@ -178,11 +218,11 @@ fn make_map(player: &mut Object) -> Map {
 
     if !failed {
       create_room(new_room, &mut map);
+      place_objects(new_room, &map, objects);
       let (new_x, new_y) = new_room.center();
 
       if rooms.is_empty() {
-        player.x = new_x;
-        player.y = new_y;
+        objects[PLAYER].set_pos(new_x, new_y);
       } else {
         let (prev_x, prev_y) = rooms[rooms.len() - 1].center();
 
@@ -225,9 +265,71 @@ fn create_v_tunnel(y1: i32, y2: i32, x: i32, map: &mut Map) {
   }
 }
 
+fn place_objects(room: Rect, map: &Map, objects: &mut Vec<Object>) {
+  let num_monsters = rand::thread_rng().gen_range(0, MAX_ROOM_MONSTERS + 1);
+
+  for _ in 0..num_monsters {
+    let x = rand::thread_rng().gen_range(room.x1 + 1, room.x2);
+    let y = rand::thread_rng().gen_range(room.y1 + 1, room.y2);
+
+    if !is_blocked(x, y, map, objects) {
+      let mut monster = if rand::random::<f32>() < 0.8 {
+        // 80% chance of spawning an orc
+        Object::new(x, y, 'o', "orc", DESATURATED_GREEN, true)
+      } else {
+        // 20% chance of spawning a troll
+        Object::new(x, y, 'T', "troll", DARKER_GREEN, true)
+      };
+
+      monster.alive = true;
+      objects.push(monster);
+    }
+  }
+}
+
+fn is_blocked(x: i32, y: i32, map: &Map, objects: &[Object]) -> bool {
+  if map[x as usize][y as usize].blocked {
+    return true;
+  }
+
+  objects
+    .iter()
+    .any(|object| object.blocks && object.pos() == (x, y))
+}
+
+// Move by given amount, if the destination is not blocked
+fn move_by(id: usize, dx: i32, dy: i32, map: &Map, objects: &mut [Object]) {
+  let (x, y) = objects[id].pos();
+  if !is_blocked(x + dx, y + dy, map, objects) {
+    objects[id].set_pos(x + dx, y + dy);
+  }
+}
+
+fn player_move_or_attack(dx: i32, dy: i32, game: &Game, objects: &mut [Object]) {
+  // The coordinates the player is moving to / attacking
+  let x = objects[PLAYER].x + dx;
+  let y = objects[PLAYER].y + dy;
+
+  // Try to find an attackable object there
+  let target_id = objects.iter().position(|object| object.pos() == (x, y));
+
+  // Attack target if found, move otherwise
+  match target_id {
+    Some(target_id) => {
+      println!(
+        "The {} laughs at your puny efforts to attack him!",
+        objects[target_id].name
+      );
+    }
+    None => {
+      move_by(PLAYER, dx, dy, &game.map, objects);
+    }
+  }
+}
+
 fn render_all(tcod: &mut Tcod, game: &mut Game, objects: &[Object], fov_recompute: bool) {
   if fov_recompute {
-    let player = &objects[0];
+    let player = &objects[PLAYER];
     tcod
       .fov
       .compute_fov(player.x, player.y, TORCH_RADIUS, FOV_LIGHT_WALLS, FOV_ALGO);
@@ -294,17 +396,15 @@ fn main() {
   };
 
   // Create player object
-  let player = Object::new(0, 0, '@', WHITE);
-
-  // // Create an NPC
-  let npc = Object::new(SCREEN_WIDTH / 2 - 5, SCREEN_HEIGHT / 2, '@', YELLOW);
+  let mut player = Object::new(0, 0, '@', "player", WHITE, true);
+  player.alive = true;
 
   // List of objects in the world
-  let mut objects = [player, npc];
+  let mut objects = vec![player];
 
   let mut game = Game {
     // Generate map
-    map: make_map(&mut objects[0]),
+    map: make_map(&mut objects),
   };
 
   // Populate FOV map, according to generated map
@@ -325,15 +425,24 @@ fn main() {
   while !tcod.root.window_closed() {
     tcod.con.clear();
 
-    let fov_recompute = previous_player_position != (objects[0].x, objects[0].y);
+    let fov_recompute = previous_player_position != (objects[PLAYER].pos());
     render_all(&mut tcod, &mut game, &objects, fov_recompute);
     tcod.root.flush();
 
-    let player = &mut objects[0];
-    previous_player_position = (player.x, player.y);
-    let exit = handle_keys(&mut tcod, &game, player);
-    if exit {
+    previous_player_position = objects[PLAYER].pos();
+    let player_action = handle_keys(&mut tcod, &game, &mut objects);
+    if player_action == PlayerAction::Exit {
       break;
     }
+
+    // Let monsters take their turn
+    if objects[PLAYER].alive && player_action != PlayerAction::DidntTakeTurn {
+      for object in &objects {
+        // ONly if object is not player
+        if (object as *const _) != (&objects[PLAYER] as *const _) {
+          println!("The {} growls!", object.name);
+        }
+      }
+    }
   }
 }