Dungeon building blocks

src/main.rs

@@ -3,14 +3,15 @@
 #![allow(unused_mut)]
 #![allow(dead_code)]
 
+use std::cmp;
 use tcod::colors::*;
 use tcod::console::*;
 
-const MAP_WIDTH: i32 = 80;
-const MAP_HEIGHT: i32 = 45;
 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 COLOR_DARK_WALL: Color = Color { r: 0, g: 0, b: 100 };
 const COLOR_DARK_GROUND: Color = Color {
     r: 50,
@@ -23,6 +24,7 @@ struct Tcod {
     con: Offscreen,
 }
 
+#[derive(Debug)]
 struct Object {
     x: i32,
     y: i32,
@@ -35,10 +37,12 @@ impl Object {
         Object { x, y, char, color }
     }
 
-    // Move by given amount
-    pub fn move_by(&mut self, dx: i32, dy: i32) {
-        self.x += dx;
-        self.y += dy;
+    // 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;
+        }
     }
 
     // Set the color and then draw the character that represents this object at its position
@@ -70,11 +74,36 @@ impl Tile {
     }
 }
 
-fn handle_keys(tcod: &mut Tcod, player: &mut Object) -> bool {
+type Map = Vec<Vec<Tile>>;
+
+struct Game {
+    map: Map,
+}
+
+// A rectangle on the map, used to characterise a room.
+#[derive(Clone, Copy, Debug)]
+struct Rect {
+    x1: i32,
+    y1: i32,
+    x2: i32,
+    y2: i32,
+}
+
+impl Rect {
+    pub fn new(x: i32, y: i32, w: i32, h: i32) -> Self {
+        Rect {
+            x1: x,
+            y1: y,
+            x2: x + w,
+            y2: y + h,
+        }
+    }
+}
+
+fn handle_keys(tcod: &mut Tcod, game: &Game, player: &mut Object) -> bool {
     use tcod::input::Key;
     use tcod::input::KeyCode::*;
 
-    // todo: handle keys
     let key = tcod.root.wait_for_keypress(true);
     match key {
         Key {
@@ -88,16 +117,86 @@ fn handle_keys(tcod: &mut Tcod, player: &mut Object) -> bool {
         }
         Key { code: Escape, .. } => return true, // exit game
 
-        Key { code: Up, .. } => player.move_by(0, -1),
-        Key { code: Down, .. } => player.move_by(0, 1),
-        Key { code: Left, .. } => player.move_by(-1, 0),
-        Key { code: Right, .. } => player.move_by(1, 0),
+        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),
 
         _ => {}
     }
     false
 }
 
+fn make_map() -> Map {
+    // Fill the map with unblocked tiles
+    let mut map = vec![vec![Tile::wall(); MAP_HEIGHT as usize]; MAP_WIDTH as usize];
+
+    // Create two rooms
+    let room1 = Rect::new(20, 15, 10, 15);
+    let room2 = Rect::new(50, 15, 10, 15);
+    create_room(room1, &mut map);
+    create_room(room2, &mut map);
+    create_h_tunnel(25, 55, 23, &mut map);
+
+    map
+}
+
+fn create_room(room: Rect, map: &mut Map) {
+    // Go through the tiles in the rectangle and make them passable
+    for x in (room.x1 + 1)..room.x2 {
+        for y in (room.y1 + 1)..room.y2 {
+            map[x as usize][y as usize] = Tile::empty();
+        }
+    }
+}
+
+fn create_h_tunnel(x1: i32, x2: i32, y: i32, map: &mut Map) {
+    // Horizontal tunnel. `min()` and `max()` are used in case
+    // `x1 > x2`
+    for x in cmp::min(x1, x2)..(cmp::max(x1, x2) + 1) {
+        map[x as usize][y as usize] = Tile::empty();
+    }
+}
+
+fn create_v_tunnel(y1: i32, y2: i32, x: i32, map: &mut Map) {
+    // Vertical tunnel
+    for y in cmp::min(y1, y2)..(cmp::max(y1, y2) + 1) {
+        map[x as usize][y as usize] = Tile::empty();
+    }
+}
+
+fn render_all(tcod: &mut Tcod, game: &Game, objects: &[Object]) {
+    // Draw all objects in the list
+    for object in objects {
+        object.draw(&mut tcod.con);
+    }
+
+    // Go through all tiles and set their background color
+    for y in 0..MAP_HEIGHT {
+        for x in 0..MAP_WIDTH {
+            let wall = game.map[x as usize][y as usize].block_sight;
+            if wall {
+                tcod.con
+                    .set_char_background(x, y, COLOR_DARK_WALL, BackgroundFlag::Set);
+            } else {
+                tcod.con
+                    .set_char_background(x, y, COLOR_DARK_GROUND, BackgroundFlag::Set)
+            }
+        }
+    }
+
+    // Blit contents of "con" to the root console
+    blit(
+        &tcod.con,
+        (0, 0),
+        (MAP_WIDTH, MAP_HEIGHT),
+        &mut tcod.root,
+        (0, 0),
+        1.0,
+        1.0,
+    );
+}
+
 fn main() {
     tcod::system::set_fps(FPS);
 
@@ -108,12 +207,12 @@ fn main() {
         .title("Rust/libtcod tutorial")
         .init();
 
-    let con = Offscreen::new(SCREEN_WIDTH, SCREEN_HEIGHT);
+    let con = Offscreen::new(MAP_WIDTH, MAP_HEIGHT);
 
     let mut tcod = Tcod { root, con };
 
     // Create player object
-    let player = Object::new(SCREEN_WIDTH / 2, SCREEN_HEIGHT / 2, '@', WHITE);
+    let player = Object::new(25, 23, '@', WHITE);
 
     // // Create an NPC
     let npc = Object::new(SCREEN_WIDTH / 2 - 5, SCREEN_HEIGHT / 2, '@', YELLOW);
@@ -121,6 +220,11 @@ fn main() {
     // List of objects in the world
     let mut objects = [player, npc];
 
+    let game = Game {
+        // Generate map
+        map: make_map(),
+    };
+
     while !tcod.root.window_closed() {
         tcod.con.clear();
 
@@ -128,19 +232,11 @@ fn main() {
             object.draw(&mut tcod.con)
         }
 
-        blit(
-            &tcod.con,
-            (0, 0),
-            (SCREEN_WIDTH, SCREEN_HEIGHT),
-            &mut tcod.root,
-            (0, 0),
-            1.0,
-            1.0,
-        );
+        render_all(&mut tcod, &game, &objects);
         tcod.root.flush();
 
         let player = &mut objects[0];
-        let exit = handle_keys(&mut tcod, player);
+        let exit = handle_keys(&mut tcod, &game, player);
         if exit {
             break;
         }