dungeoncrawler

dungeoncrawler/Cargo.toml

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+[package]
+name = "dungeoncrawler"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+bracket-lib = "~0.8.1"

dungeoncrawler/src/main.rs

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+mod map;
+mod player;
+
+mod prelude {
+    pub use bracket_lib::prelude::*;
+    pub const SCREEN_WIDTH: i32 = 80;
+    pub const SCREEN_HEIGHT: i32 = 50;
+    pub use crate::map::*;
+    pub use crate::player::*;
+}
+
+use prelude::*;
+
+struct State {
+    map: Map,
+    player: Player,
+}
+
+impl State {
+    fn new() -> Self {
+        Self {
+            map: Map::new(),
+            player: Player::new(Point { x: 0, y: 0 }),
+        }
+    }
+}
+
+impl GameState for State {
+    fn tick(&mut self, ctx: &mut BTerm) {
+        ctx.cls();
+        self.player.update(ctx, &self.map);
+        self.map.render(ctx);
+        self.player.render(ctx);
+    }
+}
+
+fn main() -> BError {
+    let ctx = BTermBuilder::simple80x50()
+        .with_title("Dungeon Crawler")
+        .with_fps_cap(30.0)
+        .build()?;
+
+    main_loop(ctx, State::new())
+}

dungeoncrawler/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>,
+}
+
+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 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))
+        }
+    }
+}
+
+pub fn map_idx(x: i32, y: i32) -> usize {
+    ((y * SCREEN_WIDTH) + x) as usize
+}

dungeoncrawler/src/player.rs

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