refactor map into struct with impl trait

src/main.rs

@@ -1,4 +1,4 @@
-use rltk::{Console, GameState, Rltk, RGB, VirtualKeyCode};
+use rltk::{Console, GameState, Rltk, VirtualKeyCode, RGB};
 use specs::prelude::*;
 use std::cmp::{max, min};
 mod rect;
@@ -10,52 +10,60 @@ pub use map::*;
 extern crate specs_derive;
 
 #[derive(Component)]
-struct Position {
+pub struct Position {
     x: i32,
     y: i32,
 }
 
 #[derive(Component)]
-struct Renderable {
+pub struct Renderable {
     glyph: u8,
     fg: RGB,
     bg: RGB,
 }
 
-struct State {
-    ecs: World
+pub struct State {
+    ecs: World,
 }
 
 #[derive(Component)]
-struct LeftMover {}
+pub struct LeftMover {}
 
 #[derive(Component, Debug)]
-struct Player {}
+pub struct Player {}
 
 fn try_move_player(delta_x: i32, delta_y: i32, ecs: &mut World) {
     let mut positions = ecs.write_storage::<Position>();
     let mut players = ecs.write_storage::<Player>();
-    let map = ecs.fetch::<Vec<TileType>>();
+    let map = ecs.fetch::<Map>();
 
     for (_player, pos) in (&mut players, &mut positions).join() {
         let x = min(79, max(0, pos.x + delta_x));
         let y = min(49, max(0, pos.y + delta_y));
-	if map[xy_idx(x,y)] != TileType::Wall {
+        if map.tile_at(x,y) != TileType::Wall {
             pos.x = x;
             pos.y = y;
         }
     }
 }
 
-fn player_input(gs: &mut State, ctx: &mut Rltk) {
+pub fn player_input(gs: &mut State, ctx: &mut Rltk) {
     // Player movement
     match ctx.key {
         None => {} // Nothing happened
         Some(key) => match key {
             VirtualKeyCode::Left => try_move_player(-1, 0, &mut gs.ecs),
+            VirtualKeyCode::Numpad4 => try_move_player(-1, 0, &mut gs.ecs),
+            VirtualKeyCode::H => try_move_player(-1, 0, &mut gs.ecs),
             VirtualKeyCode::Right => try_move_player(1, 0, &mut gs.ecs),
+            VirtualKeyCode::Numpad6 => try_move_player(1, 0, &mut gs.ecs),
+            VirtualKeyCode::L => try_move_player(1, 0, &mut gs.ecs),
             VirtualKeyCode::Up => try_move_player(0, -1, &mut gs.ecs),
+            VirtualKeyCode::Numpad8 => try_move_player(0, -1, &mut gs.ecs),
+            VirtualKeyCode::K => try_move_player(0, -1, &mut gs.ecs),
             VirtualKeyCode::Down => try_move_player(0, 1, &mut gs.ecs),
+            VirtualKeyCode::Numpad2 => try_move_player(0, 1, &mut gs.ecs),
+            VirtualKeyCode::J => try_move_player(0, 1, &mut gs.ecs),
             _ => {}
         },
     }
@@ -64,17 +72,17 @@ fn player_input(gs: &mut State, ctx: &mut Rltk) {
 struct LeftWalker {}
 
 impl<'a> System<'a> for LeftWalker {
-    type SystemData = (ReadStorage<'a, LeftMover>, 
-                        WriteStorage<'a, Position>);
+    type SystemData = (ReadStorage<'a, LeftMover>, WriteStorage<'a, Position>);
 
     fn run(&mut self, (lefty, mut pos): Self::SystemData) {
         for (_lefty, pos) in (&lefty, &mut pos).join() {
             pos.x -= 1;
-            if pos.x < 0 { pos.x = 79; }
+            if pos.x < 0 {
+                pos.x = 79;
+            }
         }
     }
 }
-
 
 impl State {
     fn run_systems(&mut self) {
@@ -89,8 +97,8 @@ impl GameState for State {
         ctx.cls();
         self.run_systems();
         player_input(self, ctx);
-	let map = self.ecs.fetch::<Vec<TileType>>();
-	draw_map(&map, ctx);
+        let map = self.ecs.fetch::<Map>();
+        map.draw_map(ctx);
         let positions = self.ecs.read_storage::<Position>();
         let renderables = self.ecs.read_storage::<Renderable>();
 
@@ -105,9 +113,10 @@ fn main() {
     let context = RltkBuilder::simple80x50()
         .with_title("Roguelike Tutorial")
         .build();
-    let mut gs = State {
-        ecs: World::new()
-    };
+    let mut gs = State { ecs: World::new() };
+    let map = Map::new_map_rooms_and_corridors();
+    let (player_x, player_y) = map.rooms[0].center();
+
     gs.ecs.register::<Position>();
     gs.ecs.register::<Renderable>();
     gs.ecs.register::<LeftMover>();
@@ -115,7 +124,10 @@ fn main() {
 
     gs.ecs
         .create_entity()
-        .with(Position { x: 40, y: 25 })
+        .with(Position {
+            x: player_x,
+            y: player_y,
+        })
         .with(Renderable {
             glyph: rltk::to_cp437('@'),
             fg: RGB::named(rltk::YELLOW),
@@ -136,9 +148,7 @@ fn main() {
             .with(LeftMover {})
             .build();
     }
-
-    gs.ecs.insert(new_map_rooms_and_corridors());
+    gs.ecs.insert(map);
 
     rltk::main_loop(context, gs);
 }
-

src/map.rs

@@ -8,63 +8,53 @@ pub enum TileType {
     Floor,
 }
 
-pub fn xy_idx(x: i32, y: i32) -> usize {
-    (y as usize * 80) + x as usize
+pub struct Map {
+    pub tiles: Vec<TileType>,
+    pub rooms: Vec<Rect>,
+    pub width: i32,
+    pub height: i32,
 }
 
-fn new_map_test() -> Vec<TileType> {
-    let mut map = vec![TileType::Floor; 80 * 50];
-
-    // Make the boundaries walls
-    for x in 0..80 {
-        map[xy_idx(x, 0)] = TileType::Wall;
-        map[xy_idx(x, 49)] = TileType::Wall;
-    }
-    for y in 0..50 {
-        map[xy_idx(0, y)] = TileType::Wall;
-        map[xy_idx(79, y)] = TileType::Wall;
+impl Map {
+    pub fn xy_idx(&self, x: i32, y: i32) -> usize {
+        ((y * self.width) + x) as usize
     }
 
-    // Now we'll randomly splat a bunch of walls. It won't be pretty, but it's a decent illustration.
-    // First, obtain the thread-local RNG:
-    let mut rng = rltk::RandomNumberGenerator::new();
-
-    for _i in 0..400 {
-        let x = rng.roll_dice(1, 79);
-        let y = rng.roll_dice(1, 49);
-        let idx = xy_idx(x, y);
-        if idx != xy_idx(40, 25) {
-            map[idx] = TileType::Wall;
-        }
+    pub fn tile_at(&self, x: i32, y:i32) -> TileType {
+        self.tiles[self.xy_idx(x, y)]
     }
 
-    map
-}
-
-fn apply_room_to_map(room: &Rect, map: &mut Vec<TileType>) {
+    fn apply_room_to_map(&mut self, room: &Rect) {
         for x in room.x1..room.x2 {
             for y in room.y1..room.y2 {
-            map[xy_idx(x, y)] = TileType::Floor
+                let idx = self.xy_idx(x,y);
+                self.tiles[idx] = TileType::Floor
             }
         }
     }
 
-fn apply_horizontal_tunnel(map: &mut Vec<TileType>, x1: i32, x2: i32, y: i32) {
+    fn apply_horizontal_tunnel(&mut self, x1: i32, x2: i32, y: i32) {
         for x in min(x1, x2)..=max(x1, x2) {
-        map[xy_idx(x, y)] = TileType::Floor
+            let idx=self.xy_idx(x, y);
+            self.tiles[idx] = TileType::Floor
         }
     }
 
-fn apply_vertical_tunnel(map: &mut Vec<TileType>, x: i32, y1: i32, y2: i32) {
+    fn apply_vertical_tunnel(&mut self, x: i32, y1: i32, y2: i32) {
         for y in min(y1, y2)..=max(y1, y2) {
-        map[xy_idx(x, y)] = TileType::Floor
+            let idx=self.xy_idx(x, y);
+            self.tiles[idx] = TileType::Floor
         }
     }
 
-pub fn new_map_rooms_and_corridors() -> Vec<TileType> {
-    let mut map = vec![TileType::Wall; 80 * 50];
+    pub fn new_map_rooms_and_corridors() -> Map {
+        let mut map = Map {
+            tiles: vec![TileType::Wall; 80 * 50],
+            rooms: Vec::new(),
+            width: 80,
+            height: 50,
+        };
 
-    let mut rooms: Vec<Rect> = Vec::new();
         const MAX_ROOMS: i32 = 30;
         const MIN_SIZE: i32 = 6;
         const MAX_SIZE: i32 = 10;
@@ -78,45 +68,43 @@ pub fn new_map_rooms_and_corridors() -> Vec<TileType> {
             let y = rng.roll_dice(1, 50 - h - 1) - 1;
             let new_room = Rect::new(x, y, w, h);
             let mut ok = true;
-        for other_room in rooms.iter() {
+            for other_room in map.rooms.iter() {
                 if new_room.intersect(other_room) {
                     ok = false
                 }
             }
             if ok {
-            apply_room_to_map(&new_room, &mut map);
-            if rooms.len() > 0 {
+                map.apply_room_to_map(&new_room);
+                if map.rooms.len() > 0 {
                     let r1_center = new_room.center();
-                let r2_center = rooms[rooms.len() - 1].center();
+                    let r2_center = map.rooms[map.rooms.len() - 1].center();
                     if rng.range(0, 2) == 1 {
-                    apply_horizontal_tunnel(&mut map, r1_center.0, r2_center.0, r1_center.1);
-                    apply_vertical_tunnel(
-                        &mut map,
+                        map.apply_horizontal_tunnel(r1_center.0, r2_center.0, r1_center.1);
+                        map.apply_vertical_tunnel(
                             max(r1_center.0, r2_center.0),
                             r1_center.1,
                             r2_center.1,
                         );
                     } else {
-                    apply_vertical_tunnel(&mut map, r1_center.0, r1_center.1, r2_center.1);
-                    apply_horizontal_tunnel(
-                        &mut map,
+                        map.apply_vertical_tunnel(r1_center.0, r1_center.1, r2_center.1);
+                        map.apply_horizontal_tunnel(
                             r1_center.0,
                             r2_center.0,
                             max(r1_center.1, r2_center.1),
                         );
                     }
                 }
-            rooms.push(new_room);
+                map.rooms.push(new_room);
             }
         }
 
         map
     }
 
-pub fn draw_map(map: &[TileType], ctx: &mut Rltk) {
+    pub fn draw_map(&self, ctx: &mut Rltk) {
         let mut y = 0;
         let mut x = 0;
-    for tile in map.iter() {
+        for tile in self.tiles.iter() {
             // Render a tile depending upon the tile type
             match tile {
                 TileType::Floor => {
@@ -147,3 +135,4 @@ pub fn draw_map(map: &[TileType], ctx: &mut Rltk) {
             }
         }
     }
+}