Mouse-look

src/main.rs

@@ -13,7 +13,7 @@ const SCREEN_WIDTH: i32 = 80;
 const SCREEN_HEIGHT: i32 = 50;
 const FPS: i32 = 20;
 const MAP_WIDTH: i32 = 80;
-const MAP_HEIGHT: i32 = 45;
+const MAP_HEIGHT: i32 = 43;
 const COLOR_DARK_WALL: Color = Color { r: 0, g: 0, b: 100 };
 const COLOR_LIGHT_WALL: Color = Color {
   r: 130,
@@ -38,10 +38,18 @@ const FOV_LIGHT_WALLS: bool = true;
 const TORCH_RADIUS: i32 = 10;
 const MAX_ROOM_MONSTERS: i32 = 3;
 const PLAYER: usize = 0;
+// Sizes and coordinates relevant for the GUI
+const BAR_WIDTH: i32 = 20;
+const PANEL_HEIGHT: i32 = 7;
+const PANEL_Y: i32 = SCREEN_HEIGHT - PANEL_HEIGHT;
+const MSG_X: i32 = BAR_WIDTH + 2;
+const MSG_WIDTH: i32 = SCREEN_WIDTH - BAR_WIDTH - 2;
+const MSG_HEIGHT: usize = PANEL_HEIGHT as usize - 1;
 
 struct Tcod {
   root: Root,
   con: Offscreen,
+  panel: Offscreen,
   fov: FovMap,
 }
 
@@ -94,7 +102,7 @@ impl Object {
     ((dx.pow(2) + dy.pow(2)) as f32).sqrt()
   }
 
-  pub fn take_damage(&mut self, damage: i32) {
+  pub fn take_damage(&mut self, damage: i32, game: &mut Game) {
     // Apply damage if possible
     if let Some(fighter) = self.fighter.as_mut() {
       if damage > 0 {
@@ -106,26 +114,33 @@ impl Object {
     if let Some(fighter) = self.fighter {
       if fighter.hp <= 0 {
         self.alive = false;
-        fighter.on_death.callback(self);
+        fighter.on_death.callback(self, game);
       }
     }
   }
 
-  pub fn attack(&mut self, target: &mut Object) {
+  pub fn attack(&mut self, target: &mut Object, game: &mut Game) {
     // A simple formula for attack damage
     let damage = self.fighter.map_or(0, |f| f.power) - target.fighter.map_or(0, |f| f.defense);
     if damage > 0 {
       // Make the target take some damage
-      println!(
+      game.messages.add(
+        format!(
           "{} attacks {} for {} hit points.",
           self.name, target.name, damage
+        ),
+        WHITE,
       );
-      target.take_damage(damage);
+
+      target.take_damage(damage, game);
     } else {
-      println!(
+      game.messages.add(
+        format!(
           "{} attacks {} but it has no effect!",
           self.name, target.name
-      )
+        ),
+        WHITE,
+      );
     }
   }
 }
@@ -159,6 +174,7 @@ type Map = Vec<Vec<Tile>>;
 
 struct Game {
   map: Map,
+  messages: Messages,
 }
 
 // A rectangle on the map, used to characterise a room.
@@ -201,6 +217,26 @@ struct Fighter {
   on_death: DeathCallback,
 }
 
+struct Messages {
+  messages: Vec<(String, Color)>,
+}
+
+impl Messages {
+  pub fn new() -> Self {
+    Self { messages: vec![] }
+  }
+
+  // Add the new message as a tuple, with the text and the color
+  pub fn add<T: Into<String>>(&mut self, message: T, color: Color) {
+    self.messages.push((message.into(), color));
+  }
+
+  // Create a `DoubleEndedIterator` over the messages
+  pub fn iter(&self) -> impl DoubleEndedIterator<Item = &(String, Color)> {
+    self.messages.iter()
+  }
+}
+
 #[derive(Clone, Copy, Debug, PartialEq)]
 enum PlayerAction {
   TookTurn,
@@ -220,17 +256,17 @@ enum DeathCallback {
 }
 
 impl DeathCallback {
-  fn callback(self, object: &mut Object) {
+  fn callback(self, object: &mut Object, game: &mut Game) {
     use DeathCallback::*;
-    let callback: fn(&mut Object) = match self {
+    let callback = match self {
       Player => player_death,
       Monster => monster_death,
     };
-    callback(object);
+    callback(object, game);
   }
 }
 
-fn handle_keys(tcod: &mut Tcod, game: &Game, objects: &mut Vec<Object>) -> PlayerAction {
+fn handle_keys(tcod: &mut Tcod, game: &mut Game, objects: &mut Vec<Object>) -> PlayerAction {
   use tcod::input::Key;
   use tcod::input::KeyCode::*;
   use PlayerAction::*;
@@ -400,7 +436,7 @@ fn move_by(id: usize, dx: i32, dy: i32, map: &Map, objects: &mut [Object]) {
   }
 }
 
-fn player_move_or_attack(dx: i32, dy: i32, game: &Game, objects: &mut [Object]) {
+fn player_move_or_attack(dx: i32, dy: i32, game: &mut Game, objects: &mut [Object]) {
   // The coordinates the player is moving to / attacking
   let x = objects[PLAYER].x + dx;
   let y = objects[PLAYER].y + dy;
@@ -414,7 +450,7 @@ fn player_move_or_attack(dx: i32, dy: i32, game: &Game, objects: &mut [Object])
   match target_id {
     Some(target_id) => {
       let (player, target) = mut_two(PLAYER, target_id, objects);
-      player.attack(target);
+      player.attack(target, game);
     }
     None => {
       move_by(PLAYER, dx, dy, &game.map, objects);
@@ -435,7 +471,7 @@ fn move_towards(id: usize, target_x: i32, target_y: i32, map: &Map, objects: &mu
   move_by(id, dx, dy, map, objects);
 }
 
-fn ai_take_turn(monster_id: usize, tcod: &Tcod, game: &Game, objects: &mut [Object]) {
+fn ai_take_turn(monster_id: usize, tcod: &Tcod, game: &mut Game, objects: &mut [Object]) {
   // A basic monster takes its turn. If you can see it, it can see you.
   let (monster_x, monster_y) = objects[monster_id].pos();
   if tcod.fov.is_in_fov(monster_x, monster_y) {
@@ -446,7 +482,7 @@ fn ai_take_turn(monster_id: usize, tcod: &Tcod, game: &Game, objects: &mut [Obje
     } else if objects[PLAYER].fighter.map_or(false, |f| f.hp > 0) {
       // Close enough, attach! (if the player is still alive.)
       let (monster, player) = mut_two(monster_id, PLAYER, objects);
-      monster.attack(player);
+      monster.attack(player, game);
     }
   }
 }
@@ -462,19 +498,21 @@ fn mut_two<T>(first_index: usize, second_index: usize, items: &mut [T]) -> (&mut
   }
 }
 
-fn player_death(player: &mut Object) {
+fn player_death(player: &mut Object, game: &mut Game) {
   // The game ended!
-  println!("You died!");
+  game.messages.add("You died!", RED);
 
   // For added effect, transform the player into corpse!
   player.char = '%';
   player.color = DARK_RED;
 }
 
-fn monster_death(monster: &mut Object) {
+fn monster_death(monster: &mut Object, game: &mut Game) {
   // Transform it into a nasty corpse! It doesn't block, can't be
   // attacked and doesn't move
-  println!("{} is dead!", monster.name);
+  game
+    .messages
+    .add(format!("{} is dead!", monster.name), ORANGE);
   monster.char = '%';
   monster.color = DARK_RED;
   monster.blocks = false;
@@ -483,6 +521,41 @@ fn monster_death(monster: &mut Object) {
   monster.name = format!("remains of {}", monster.name);
 }
 
+fn render_bar(
+  panel: &mut Offscreen,
+  x: i32,
+  y: i32,
+  total_width: i32,
+  name: &str,
+  value: i32,
+  maximum: i32,
+  bar_color: Color,
+  back_color: Color,
+) {
+  // Render a bar (HP, experience, etc). First calculate the width of the bar
+  let bar_width = (value as f32 / maximum as f32 * total_width as f32) as i32;
+
+  // Render the background first
+  panel.set_default_background(back_color);
+  panel.rect(x, y, total_width, 1, false, BackgroundFlag::Screen);
+
+  // Now render the bar on top
+  panel.set_default_background(bar_color);
+  if bar_width > 0 {
+    panel.rect(x, y, bar_width, 1, false, BackgroundFlag::Screen);
+  }
+
+  // Finally, some centered text with the values
+  panel.set_default_foreground(WHITE);
+  panel.print_ex(
+    x + total_width / 2,
+    y,
+    BackgroundFlag::None,
+    TextAlignment::Center,
+    &format!("{}: {}/{}", name, value, maximum),
+  );
+}
+
 fn render_all(tcod: &mut Tcod, game: &mut Game, objects: &[Object], fov_recompute: bool) {
   if fov_recompute {
     let player = &objects[PLAYER];
@@ -530,18 +603,6 @@ fn render_all(tcod: &mut Tcod, game: &mut Game, objects: &[Object], fov_recomput
     }
   }
 
-  // Show the player's stats
-  tcod.root.set_default_foreground(WHITE);
-  if let Some(fighter) = objects[PLAYER].fighter {
-    tcod.root.print_ex(
-      1,
-      SCREEN_HEIGHT - 2,
-      BackgroundFlag::None,
-      TextAlignment::Left,
-      format!("HP: {}/{} ", fighter.hp, fighter.max_hp),
-    );
-  }
-
   // Blit contents of "con" to the root console
   blit(
     &tcod.con,
@@ -552,6 +613,48 @@ fn render_all(tcod: &mut Tcod, game: &mut Game, objects: &[Object], fov_recomput
     1.0,
     1.0,
   );
+
+  // Prepare to render the GUI panel
+  tcod.panel.set_default_background(BLACK);
+  tcod.panel.clear();
+
+  // Show the player's stats
+  let hp = objects[PLAYER].fighter.map_or(0, |f| f.hp);
+  let max_hp = objects[PLAYER].fighter.map_or(0, |f| f.max_hp);
+  render_bar(
+    &mut tcod.panel,
+    1,
+    1,
+    BAR_WIDTH,
+    "HP",
+    hp,
+    max_hp,
+    LIGHT_RED,
+    DARKER_RED,
+  );
+
+  // Print the game messages, one line at a time
+  let mut y = MSG_HEIGHT as i32;
+  for &(ref msg, color) in game.messages.iter().rev() {
+    let msg_height = tcod.panel.get_height_rect(MSG_X, y, MSG_WIDTH, 0, msg);
+    y -= msg_height;
+    if y < 0 {
+      break;
+    }
+    tcod.panel.set_default_foreground(color);
+    tcod.panel.print_rect(MSG_X, y, MSG_WIDTH, 0, msg);
+  }
+
+  // Blit contents of "panel" to the root console
+  blit(
+    &tcod.panel,
+    (0, 0),
+    (SCREEN_WIDTH, PANEL_HEIGHT),
+    &mut tcod.root,
+    (0, PANEL_Y),
+    1.0,
+    1.0,
+  );
 }
 
 fn main() {
@@ -567,6 +670,7 @@ fn main() {
   let mut tcod = Tcod {
     root,
     con: Offscreen::new(MAP_WIDTH, MAP_HEIGHT),
+    panel: Offscreen::new(SCREEN_WIDTH, PANEL_HEIGHT),
     fov: FovMap::new(MAP_WIDTH, MAP_HEIGHT),
   };
 
@@ -587,6 +691,7 @@ fn main() {
   let mut game = Game {
     // Generate map
     map: make_map(&mut objects),
+    messages: Messages::new(),
   };
 
   // Populate FOV map, according to generated map
@@ -603,6 +708,12 @@ fn main() {
 
   let mut previous_player_position = (-1, -1);
 
+  // A warm welcoming message!
+  game.messages.add(
+    "Welcome stranger! Prepare to perish in the Tomb of Doom.",
+    RED,
+  );
+
   // Main game loop
   while !tcod.root.window_closed() {
     tcod.con.clear();
@@ -612,7 +723,7 @@ fn main() {
     tcod.root.flush();
 
     previous_player_position = objects[PLAYER].pos();
-    let player_action = handle_keys(&mut tcod, &game, &mut objects);
+    let player_action = handle_keys(&mut tcod, &mut game, &mut objects);
     if player_action == PlayerAction::Exit {
       break;
     }
@@ -621,7 +732,7 @@ fn main() {
     if objects[PLAYER].alive && player_action != PlayerAction::DidntTakeTurn {
       for id in 0..objects.len() {
         if objects[id].ai.is_some() {
-          ai_take_turn(id, &tcod, &game, &mut objects);
+          ai_take_turn(id, &tcod, &mut game, &mut objects);
         }
       }
     }