Refactor map module

src/main.rs

@@ -14,6 +14,12 @@ pub struct State {
     ecs: World,
 }
 
+impl State {
+    fn run_systems(&mut self) {
+        self.ecs.maintain();
+    }
+}
+
 impl GameState for State {
     fn tick(&mut self, ctx: &mut Rltk) {
         ctx.cls();
@@ -21,8 +27,7 @@ impl GameState for State {
         player_input(self, ctx);
         self.run_systems();
 
-        let map = self.ecs.fetch::<Vec<TileType>>();
-        draw_map(&map, ctx);
+        draw_map(&self.ecs, ctx);
 
         let positions = self.ecs.read_storage::<Position>();
         let renderables = self.ecs.read_storage::<Renderable>();
@@ -33,12 +38,6 @@ impl GameState for State {
     }
 }
 
-impl State {
-    fn run_systems(&mut self) {
-        self.ecs.maintain();
-    }
-}
-
 fn main() -> rltk::BError {
     use rltk::RltkBuilder;
 
@@ -52,12 +51,11 @@ fn main() -> rltk::BError {
     gs.ecs.register::<Renderable>();
     gs.ecs.register::<Player>();
 
-    let (rooms, map) = new_map_rooms_and_corridors();
+    let map: Map = Map::new_map_rooms_and_corridors();
+    let (player_x, player_y) = map.rooms[0].center();
 
     gs.ecs.insert(map);
 
-    let (player_x, player_y) = rooms[0].center();
-
     gs.ecs
         .create_entity()
         .with(Position { x: player_x, y: player_y })

src/map.rs

@@ -1,6 +1,7 @@
 use rltk::{ RGB, Rltk, RandomNumberGenerator };
 use super::{Rect};
 use std::cmp::{min, max};
+use specs::prelude::*;
 
 #[derive(PartialEq, Copy, Clone)]
 pub enum TileType {
@@ -8,46 +9,57 @@ 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,
 }
 
-/// Makes a map with solid boundaries and 400 randomly placed walls.
-/// No guarantees that it won't look awful.
-pub fn new_map_text() -> Vec<TileType> {
-    let mut map = vec![TileType::Floor; 80 * 50];
-
-    // Make the boundary 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 as usize * self.width as usize) + x as usize
     }
 
-    // Now randomly add a bunch of walls.
-    // First get the random number generator
-    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;
+    fn apply_room_to_map(&mut self, room: &Rect) {
+        for y in room.y1+1 ..= room.y2 {
+            for x in room.x1+1 ..= room.x2 {
+                let idx = self.xy_idx(x, y);
+                self.tiles[idx] = TileType::Floor;
+            }
         }
     }
 
-    map
+    fn apply_horizontal_tunnel(&mut self, x1: i32, x2: i32, y: i32) {
+        for x in min(x1, x2) ..= max(x1, x2) {
+            let idx = self.xy_idx(x, y);
+
+            if idx > 0 && idx < self.width as usize * self.height as usize {
+                self.tiles[idx as usize] = TileType::Floor;
+            }
+        }
     }
 
-pub fn new_map_rooms_and_corridors() -> (Vec<Rect>, Vec<TileType>) {
-    let mut map = vec![TileType::Wall; 80  * 50];
+    fn apply_vertical_tunnel(&mut self, y1: i32, y2: i32, x: i32) {
+        for y in min(y1, y2) ..= max(y1, y2) {
+            let idx = self.xy_idx(x, y);
+
+            if idx > 0 && idx < self.width as usize * self.height as usize {
+                self.tiles[idx as usize] = TileType::Floor;
+            }
+        }
+    }
+
+    /// Makes a new map using the algorithm from http://rogueliketutorials.com/tutorials/tcod/part-3/
+    /// This gives a handful of random rooms and corridors joining them together
+    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;
@@ -63,68 +75,43 @@ pub fn new_map_rooms_and_corridors() -> (Vec<Rect>, Vec<TileType>) {
             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);
+                map.apply_room_to_map(&new_room);
 
-            if ! rooms.is_empty() {
+                if ! map.rooms.is_empty() {
                     let (new_x, new_y) = new_room.center();
-                let (prev_x, prev_y) = rooms[rooms.len()-1].center();
+                    let (prev_x, prev_y) = map.rooms[map.rooms.len()-1].center();
 
                     if rng.range(0, 2) == 1 {
-                    apply_horizontal_tunnel(&mut map, prev_x, new_x, prev_y);
-                    apply_vertical_tunnel(&mut map, prev_y, new_y, new_x);
+                        map.apply_horizontal_tunnel(prev_x, new_x, prev_y);
+                        map.apply_vertical_tunnel(prev_y, new_y, new_x);
                     } else {
-                    apply_vertical_tunnel(&mut map, prev_y, new_y, prev_x);
-                    apply_horizontal_tunnel(&mut map, prev_x, new_x, new_y);
+                        map.apply_vertical_tunnel(prev_y, new_y, prev_x);
+                        map.apply_horizontal_tunnel(prev_x, new_x, new_y);
                     }
                 }
 
-            rooms.push(new_room);
+                map.rooms.push(new_room);
             }
         }
 
-    (rooms, map)
-}
-
-fn apply_room_to_map(room: &Rect, map: &mut [TileType]) {
-    for y in room.y1+1 ..= room.y2 {
-        for x in room.x1+1 ..= room.x2 {
-            map[xy_idx(x, y)] = TileType::Floor;
-        }
+        map
     }
 }
 
-fn apply_horizontal_tunnel(map: &mut [TileType], x1: i32, x2: i32, y: i32) {
-    for x in min(x1, x2) ..= max(x1, x2) {
-        let idx = xy_idx(x, y);
+pub fn draw_map(ecs: &World, ctx: &mut Rltk) {
+    let map = ecs.fetch::<Map>();
 
-        if idx > 0 && idx < 80*50 {
-            map[idx as usize] = TileType::Floor;
-        }
-    }
-}
-
-fn apply_vertical_tunnel(map: &mut [TileType], y1: i32, y2: i32, x: i32) {
-    for y in min(y1, y2) ..= max(y1, y2) {
-        let idx = xy_idx(x, y);
-
-        if idx > 0 && idx < 80*50 {
-            map[idx as usize] = TileType::Floor;
-        }
-    }
-}
-
-pub fn draw_map(map: &[TileType], ctx: &mut Rltk) {
     let mut y = 0;
     let mut x = 0;
 
-    for tile in map.iter() {
+    for (_idx, tile) in map.tiles.iter().enumerate() {
         match tile {
             TileType::Floor => {
                 ctx.set(

src/player.rs

@@ -1,16 +1,16 @@
 use rltk::{VirtualKeyCode, Rltk};
 use specs::prelude::*;
-use super::{Position, Player, TileType, xy_idx, State};
+use super::{Position, Player, TileType, State, Map};
 use std::cmp::{min, max};
 
 pub 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 destination_idx = xy_idx(pos.x + delta_x, pos.y + delta_y);
-        if map[destination_idx] != TileType::Wall {
+        let destination_idx = map.xy_idx(pos.x + delta_x, pos.y + delta_y);
+        if map.tiles[destination_idx] != TileType::Wall {
             pos.x = min(79, max(0, pos.x + delta_x));
             pos.y = min(49, max(0, pos.y + delta_y));
         }