feat: add dungeon crawl with graphic

Author: mdssjc

books/hands-on-rust/dungeoncrawl/resources/dungeonfont.png

@@ -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 {
+        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;
+    }
+}

books/hands-on-rust/dungeoncrawl/src/camera.rs

@@ -1,20 +1,25 @@
+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 use crate::camera::*;
     pub use crate::map::*;
     pub use crate::map_builder::*;
     pub use crate::player::*;
+    pub const DISPLAY_WIDTH: i32 = SCREEN_WIDTH / 2;
+    pub const DISPLAY_HEIGHT: i32 = SCREEN_HEIGHT / 2;
 }
 
 use prelude::*;
 
 struct State {
     map: Map,
     player: Player,
+    camera: Camera,
 }
 
 impl State {
@@ -24,23 +29,33 @@ impl State {
         Self {
             map: map_builder.map,
             player: Player::new(map_builder.player_start),
+            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();
-        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()
+    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("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())

books/hands-on-rust/dungeoncrawl/src/main.rs

@@ -22,16 +22,31 @@ 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::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('#'),
+                            );
+                        }
                     }
                 }
             }

books/hands-on-rust/dungeoncrawl/src/map.rs

@@ -9,17 +9,18 @@ impl Player {
         Self { position }
     }
 
-    pub fn render(&self, ctx: &mut BTerm) {
+    pub fn render(&self, ctx: &mut BTerm, camera: &Camera) {
+        ctx.set_active_console(1);
         ctx.set(
-            self.position.x,
-            self.position.y,
+            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) {
+    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),
@@ -32,6 +33,7 @@ impl Player {
             let new_position = self.position + delta;
             if map.can_enter_tile(new_position) {
                 self.position = new_position;
+                camera.on_player_move(new_position);
             }
         }
     }