add visuals and camera - chapter 5

rusty-roguelike/src/camera.rs

@@ -0,0 +1,26 @@
+use crate::prelude::*;
+
+pub struct Camera {
+    pub left_x: i32,
+    pub right_x: i32,
+    pub top_y: i32,
+    pub bottom_y: i32,
+}
+
+impl Camera {
+    pub fn new(player_position: Point) -> Self {
+        return Self {
+            left_x: player_position.x - DISPLAY_WIDTH / 2,
+            right_x: player_position.x + DISPLAY_WIDTH / 2,
+            top_y: player_position.y - DISPLAY_HEIGHT / 2,
+            bottom_y: player_position.y + DISPLAY_HEIGHT / 2,
+        };
+    }
+
+    pub fn on_player_move(&mut self, player_position: Point) {
+        self.left_x = player_position.x - DISPLAY_WIDTH / 2;
+        self.right_x = player_position.x + DISPLAY_WIDTH / 2;
+        self.top_y = player_position.y - DISPLAY_HEIGHT / 2;
+        self.bottom_y = player_position.y + DISPLAY_HEIGHT / 2;
+    }
+}

rusty-roguelike/src/main.rs

@@ -1,42 +1,69 @@
 mod map;
 mod player;
+mod map_builder;
+mod camera;
 
 mod prelude {
     pub use bracket_lib::prelude::*;
     pub use crate::map::*;
     pub use crate::player::*;
+    pub use crate::map_builder::*;
+    pub use crate::camera::*;
     
     pub const SCREEN_WIDTH: i32 = 80;
     pub const SCREEN_HEIGHT: i32 = 50;
+    
+    pub const DISPLAY_WIDTH: i32 = SCREEN_WIDTH / 2;
+    pub const DISPLAY_HEIGHT: i32 = SCREEN_HEIGHT / 2;
 }
 
+const FONT_PATH: &str = "dungeonfont.png";
+
 use prelude::*;
 
 struct State {
     map: Map,
     player: Player,
+    camera: Camera,
 }
 
 impl State {
     fn new() -> Self {
+        let mut rng = RandomNumberGenerator::new();
+        let mb = MapBuilder::new(&mut rng);
+
         return Self {
-            map: Map::new(),
-            player: Player::new(Point { x: SCREEN_WIDTH / 2, y: SCREEN_HEIGHT / 2 }),
+            map: mb.map,
+            player: Player::new(mb.player_start),
+            camera: Camera::new(mb.player_start),
         };
     }
 }
 
 impl GameState for State {
     fn tick(&mut self, ctx: &mut BTerm) {
+        ctx.set_active_console(0);
         ctx.cls();
-        self.player.update(ctx, &self.map);
-        self.map.render(ctx);
-        self.player.render(ctx);
+        ctx.set_active_console(1);
+        ctx.cls();
+
+        self.player.update(ctx, &self.map, &mut self.camera);
+        self.map.render(ctx, &self.camera);
+        self.player.render(ctx, &self.camera);
     }
 }
 
 fn main() -> BError {
-    let context = BTermBuilder::simple80x50().with_title("Dungeon Crawler").with_fps_cap(30.0).build()?;
+    let context = BTermBuilder::new()
+        .with_title("Dungeon Crawler")
+        .with_fps_cap(30.0)
+        .with_dimensions(DISPLAY_WIDTH, DISPLAY_HEIGHT)
+        .with_tile_dimensions(32, 32)
+        .with_resource_path("resources/")
+        .with_font(FONT_PATH, 32, 32)
+        .with_simple_console(DISPLAY_WIDTH, DISPLAY_HEIGHT, FONT_PATH)
+        .with_simple_console_no_bg(DISPLAY_WIDTH, DISPLAY_HEIGHT, FONT_PATH)
+        .build()?;
 
     return main_loop(context, State::new());
 }

rusty-roguelike/src/map.rs

@@ -2,7 +2,7 @@ pub use crate::prelude::*;
 
 const NUM_TILES: usize = (SCREEN_WIDTH * SCREEN_HEIGHT) as usize;
 
-#[derive(Copy, Clone, PartialEq)]
+#[derive(Copy, Clone, PartialEq, Debug)]
 pub enum TileType {
     Floor,
     Wall,
@@ -39,16 +39,33 @@ impl Map {
         }
     }
     
-    pub fn render(&self, ctx: &mut BTerm) {
-        for y in 0..SCREEN_HEIGHT {
-            for x in 0..SCREEN_WIDTH {
-                let idx = map_idx(x, y);
-                match self.tiles[idx] {
-                    TileType::Floor => {
-                        ctx.set(x, y, YELLOW, BLACK, to_cp437('.'));
-                    }
-                    TileType::Wall => {
-                        ctx.set(x, y, GREEN, BLACK, to_cp437('#'));
+    pub fn render(&self, ctx: &mut BTerm, camera: &Camera) {
+        ctx.set_active_console(0);
+
+        for y in camera.top_y..camera.bottom_y {
+            for x in camera.left_x..camera.right_x {
+                if self.in_bounds(Point::new(x, y)) {
+                    let idx = map_idx(x, y);
+
+                    match self.tiles[idx] {
+                        TileType::Wall => {
+                            ctx.set(
+                                x - camera.left_x,
+                                y - camera.top_y,
+                                WHITE,
+                                BLACK,
+                                to_cp437('#'),
+                            );
+                        }
+                        TileType::Floor => {
+                            ctx.set(
+                                x - camera.left_x,
+                                y - camera.top_y,
+                                WHITE,
+                                BLACK,
+                                to_cp437('.'),
+                            );
+                        }
                     }
                 }
             }

rusty-roguelike/src/map_builder.rs

@@ -0,0 +1,97 @@
+use crate::prelude::*;
+
+const NUM_ROOMS: usize = 20;
+
+pub struct MapBuilder {
+    pub map: Map,
+    pub rooms: Vec<Rect>,
+    pub player_start: Point,
+}
+
+
+impl MapBuilder {
+    pub fn new(rng: &mut RandomNumberGenerator) -> Self {
+        let mut mb = MapBuilder {
+            map: Map::new(),
+            rooms: Vec::new(),
+            player_start: Point::zero(), 
+        };
+
+        mb.fill(TileType::Wall);
+        mb.build_random_rooms(rng);
+        mb.build_corridors(rng);
+        mb.player_start = mb.rooms[0].center();
+
+        return mb;
+    }
+
+    fn fill(&mut self, tile: TileType) {
+        self.map.tiles.iter_mut().for_each(|t| *t = tile);
+    }
+
+    fn build_random_rooms(&mut self, rng: &mut RandomNumberGenerator) {
+        while self.rooms.len() < NUM_ROOMS {
+            let room = Rect::with_size(
+                rng.range(1, SCREEN_WIDTH - 10),
+                rng.range(1, SCREEN_HEIGHT - 10),
+                rng.range(2, 10),
+                rng.range(2, 10),
+            );
+
+            let mut overlap = false;
+            for r in self.rooms.iter() {
+                if r.intersect(&room) {
+                    overlap = true;
+                    break;
+                }
+            }
+
+            if !overlap {
+                room.for_each(|p| {
+                    if p.x > 0 && p.x < SCREEN_WIDTH && p.y > 0 && p.y < SCREEN_HEIGHT {
+                        let p_idx = map_idx(p.x, p.y);
+                        self.map.tiles[p_idx] = TileType::Floor;
+                    }
+                });
+
+                self.rooms.push(room);
+            }
+        }
+    }
+
+    fn build_corridors(&mut self, rng: &mut RandomNumberGenerator) {
+        let mut rooms = self.rooms.clone();
+        rooms.sort_by(|a, b| a.center().x.cmp(&b.center().x));
+
+        for (i, room) in rooms.iter().enumerate().skip(1) {
+            let prev = rooms[i-1].center();
+            let next = room.center();
+
+            if rng.range(0, 2) == 1 {
+                self.apply_vertical_tunnel(prev.y, next.y, prev.x);
+                self.apply_horizontal_tunnel(prev.x, next.x, next.y);
+            } else {
+                self.apply_horizontal_tunnel(prev.x, next.x, prev.y);
+                self.apply_vertical_tunnel(prev.y, next.y, next.x);
+            }
+        }
+    }
+
+    fn apply_vertical_tunnel(&mut self, y1: i32, y2: i32, x: i32) {
+        use std::cmp::{min, max};
+        for y in min(y1, y2) ..= max(y1, y2) {
+            if let Some(idx) = self.map.try_idx(Point::new(x, y)) {
+                self.map.tiles[idx] = TileType::Floor;
+            }
+        }
+    }
+
+    fn apply_horizontal_tunnel(&mut self, x1: i32, x2: i32, y: i32) {
+        use std::cmp::{min, max};
+        for x in min(x1, x2) ..= max(x1, x2) {
+            if let Some(idx) = self.map.try_idx(Point::new(x, y)) {
+                self.map.tiles[idx] = TileType::Floor;
+            }
+        }
+    }
+}

rusty-roguelike/src/player.rs

@@ -13,7 +13,7 @@ impl Player {
         };
     }
 
-    pub fn update(&mut self, ctx: &mut BTerm, map: &Map) {
+    pub fn update(&mut self, ctx: &mut BTerm, map: &Map, camera: &mut Camera) {
         if let Some(key) = ctx.key {
             let delta = match key {
                 VirtualKeyCode::Up => Point::new(0, -1),
@@ -26,14 +26,17 @@ impl Player {
             let new_pos = self.position + delta;
             if map.can_enter_tile(new_pos) {
                 self.position = new_pos;
+                camera.on_player_move(new_pos);
             }
         }
     }
 
-    pub fn render(&self, ctx: &mut BTerm) {
+    pub fn render(&self, ctx: &mut BTerm, camera: &Camera) {
+        ctx.set_active_console(1);
+
         return ctx.set(
-            self.position.x,
-            self.position.y,
+            self.position.x - camera.left_x,
+            self.position.y - camera.top_y,
             WHITE,
             BLACK,
             to_cp437('@')