chap5

.gitignore

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+/target

Cargo.toml

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+[package]
+name = "dungeoncrawl"
+version = "0.1.0"
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+bracket-lib = "~0.8.1"

src/camera.rs

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+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 {
+        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;
+    }
+}

src/main.rs

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

src/map.rs

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+use crate::prelude::*;
+const NUM_TILES: usize = (SCREEN_WIDTH * SCREEN_HEIGHT) as usize;
+
+#[derive(Copy, Clone, PartialEq)]
+pub enum TileType {
+    Wall,
+    Floor,
+}
+
+pub struct Map {
+    pub tiles: Vec<TileType>,
+}
+
+pub fn map_idx(x: i32, y: i32) -> usize {
+    ((y * SCREEN_WIDTH) + x) as usize
+}
+
+impl Map {
+    pub fn new() -> Self {
+        Self {
+            tiles: vec![TileType::Floor; NUM_TILES],
+        }
+    }
+    // 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::Floor => {
+                            ctx.set(
+                                x - camera.left_x,
+                                y - camera.top_y,
+                                WHITE,
+                                BLACK,
+                                to_cp437('.'),
+                            );
+                        }
+                        TileType::Wall => {
+                            ctx.set(
+                                x - camera.left_x,
+                                y - camera.top_y,
+                                WHITE,
+                                BLACK,
+                                to_cp437('#'),
+                            );
+                        }
+                    }
+                }
+            }
+        }
+    }
+    pub fn in_bounds(&self, point: Point) -> bool {
+        point.x >= 0 && point.x < SCREEN_WIDTH && point.y >= 0 && point.y < SCREEN_HEIGHT
+    }
+    pub fn can_enter_tile(&self, point: Point) -> bool {
+        self.in_bounds(point) && self.tiles[map_idx(point.x, point.y)] == TileType::Floor
+    }
+    pub fn try_idx(&self, point: Point) -> Option<usize> {
+        if !self.in_bounds(point) {
+            None
+        } else {
+            Some(map_idx(point.x, point.y))
+        }
+    }
+}

src/map_builder.rs

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+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();
+        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;
+                }
+            }
+            if !overlap {
+                room.for_each(|p| {
+                    if p.x > 0 && p.x < SCREEN_WIDTH && p.y > 0 && p.y < SCREEN_HEIGHT {
+                        let idx = map_idx(p.x, p.y);
+                        self.map.tiles[idx] = TileType::Floor;
+                    }
+                });
+
+                self.rooms.push(room)
+            }
+        }
+    }
+
+    fn apply_horizontal_tunnel(&mut self, x1: i32, x2: i32, y: i32) {
+        use std::cmp::{max, min};
+        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 as usize] = TileType::Floor;
+            }
+        }
+    }
+
+    fn apply_vertical_tunnel(&mut self, y1: i32, y2: i32, x: i32) {
+        use std::cmp::{max, min};
+        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 as usize] = TileType::Floor;
+            }
+        }
+    }
+
+    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 new = room.center();
+
+            if rng.range(0, 2) == 1 {
+                self.apply_horizontal_tunnel(prev.x, new.x, prev.y);
+                self.apply_vertical_tunnel(prev.y, new.y, prev.x);
+            } else {
+                self.apply_vertical_tunnel(prev.y, new.y, prev.x);
+                self.apply_horizontal_tunnel(prev.x, new.x, prev.y);
+            }
+        }
+    }
+}

src/player.rs

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+use crate::prelude::*;
+
+pub struct Player {
+    pub position: Point,
+}
+impl Player {
+    pub fn new(position: Point) -> Self {
+        Self { position }
+    }
+    pub fn render(&self, ctx: &mut BTerm, camera: &Camera) {
+        ctx.set_active_console(1);
+        ctx.set(
+            self.position.x - camera.left_x,
+            self.position.y - camera.top_y,
+            WHITE,
+            BLACK,
+            to_cp437('@'),
+        );
+    }
+    pub fn update(&mut self, ctx: &mut BTerm, map: &Map, camera: &mut Camera) {
+        if let Some(key) = ctx.key {
+            let delta = match key {
+                VirtualKeyCode::Left => Point::new(-1, 0),
+                VirtualKeyCode::Right => Point::new(1, 0),
+                VirtualKeyCode::Up => Point::new(0, -1),
+                VirtualKeyCode::Down => Point::new(0, 1),
+                _ => Point::zero(),
+            };
+            let new_position = self.position + delta;
+            if map.can_enter_tile(new_position) {
+                self.position = new_position;
+                camera.on_player_move(new_position);
+            }
+        }
+    }
+}