Make MapBuilder modular with MapArchitect trait

src/map_builder/automata.rs

@@ -0,0 +1,94 @@
+use super::MapArchitect;
+use crate::prelude::*;
+
+pub struct CellularAutomataArchitect {}
+
+impl MapArchitect for CellularAutomataArchitect {
+    fn new(&mut self, rng: &mut RandomNumberGenerator) -> MapBuilder {
+        let mut mb = MapBuilder {
+            map: Map::new(),
+            rooms: Vec::new(),
+            monster_spawns: Vec::new(),
+            player_start: Point::zero(),
+            amulet_start: Point::zero(),
+            theme: super::themes::DungeonTheme::new(),
+        };
+
+        self.random_noise_map(rng, &mut mb.map);
+        for _ in 0..10 {
+            self.iteration(&mut mb.map);
+        }
+
+        let start = self.find_start(&mb.map);
+        mb.monster_spawns = mb.spawn_monsters(&start, rng);
+        mb.player_start = start;
+        mb.amulet_start = mb.find_most_distant(&mb.player_start);
+
+        mb
+    }
+}
+
+impl CellularAutomataArchitect {
+    fn random_noise_map(&mut self, rng: &mut RandomNumberGenerator, map: &mut Map) {
+        map.tiles.iter_mut().for_each(|t| {
+            let roll = rng.range(0, 100);
+            if roll > 55 {
+                *t = TileType::Floor;
+            } else {
+                *t = TileType::Wall;
+            }
+        });
+    }
+
+    fn count_neighbors(&self, x: i32, y: i32, map: &Map) -> usize {
+        let mut neighbors = 0;
+
+        for iy in -1..=1 {
+            for ix in -1..1 {
+                if !(ix == 0 && iy == 0) && map.tiles[map_idx(x + ix, y + iy)] == TileType::Wall {
+                    neighbors += 1;
+                }
+            }
+        }
+
+        neighbors
+    }
+
+    fn iteration(&mut self, map: &mut Map) {
+        let mut new_tiles = map.tiles.clone();
+
+        for y in 1..SCREEN_HEIGHT - 1 {
+            for x in 1..SCREEN_WIDTH - 1 {
+                let neighbors = self.count_neighbors(x, y, map);
+                let idx = map_idx(x, y);
+                if neighbors > 4 || neighbors == 0 {
+                    new_tiles[idx] = TileType::Wall;
+                } else {
+                    new_tiles[idx] = TileType::Floor;
+                }
+            }
+        }
+
+        map.tiles = new_tiles;
+    }
+
+    fn find_start(&self, map: &Map) -> Point {
+        let center = Point::new(SCREEN_WIDTH / 2, SCREEN_HEIGHT / 2);
+        let closest_point = map
+            .tiles
+            .iter()
+            .enumerate()
+            .filter(|(_, t)| **t == TileType::Floor)
+            .map(|(idx, _)| {
+                (
+                    idx,
+                    DistanceAlg::Pythagoras.distance2d(center, map.index_to_point2d(idx)),
+                )
+            })
+            .min_by(|(_, distance), (_, distance2)| distance.partial_cmp(&distance2).unwrap())
+            .map(|(idx, _)| idx)
+            .unwrap();
+
+        map.index_to_point2d(closest_point)
+    }
+}

src/map_builder/drunkard.rs

@@ -0,0 +1,87 @@
+use super::MapArchitect;
+use crate::prelude::*;
+
+const STAGGER_DISTANCE: usize = 400;
+const NUM_TILES: usize = (SCREEN_WIDTH * SCREEN_HEIGHT) as usize;
+const DESIRED_FLOOR: usize = NUM_TILES / 3;
+
+pub struct DrunkardsWalkArchitect {}
+
+impl MapArchitect for DrunkardsWalkArchitect {
+    fn new(&mut self, rng: &mut RandomNumberGenerator) -> MapBuilder {
+        let mut mb = MapBuilder {
+            map: Map::new(),
+            rooms: Vec::new(),
+            monster_spawns: Vec::new(),
+            player_start: Point::zero(),
+            amulet_start: Point::zero(),
+            theme: super::themes::DungeonTheme::new(),
+        };
+
+        mb.fill(TileType::Wall);
+        let center = Point::new(SCREEN_WIDTH / 2, SCREEN_HEIGHT / 2);
+        self.drunkard(&center, rng, &mut mb.map);
+
+        while mb
+            .map
+            .tiles
+            .iter()
+            .filter(|t| **t == TileType::Floor)
+            .count()
+            < DESIRED_FLOOR
+        {
+            self.drunkard(
+                &Point::new(rng.range(0, SCREEN_WIDTH), rng.range(0, SCREEN_HEIGHT)),
+                rng,
+                &mut mb.map,
+            );
+
+            let dijkstra_map = DijkstraMap::new(
+                SCREEN_WIDTH,
+                SCREEN_HEIGHT,
+                &[mb.map.point2d_to_index(center)],
+                &mb.map,
+                1024.0,
+            );
+            dijkstra_map
+                .map
+                .iter()
+                .enumerate()
+                .filter(|(_, distance)| *distance > &2000.0)
+                .for_each(|(idx, _)| mb.map.tiles[idx] = TileType::Wall);
+        }
+
+        mb.monster_spawns = mb.spawn_monsters(&center, rng);
+        mb.player_start = center;
+        mb.amulet_start = mb.find_most_distant(&mb.player_start);
+
+        mb
+    }
+}
+
+impl DrunkardsWalkArchitect {
+    fn drunkard(&mut self, start: &Point, rng: &mut RandomNumberGenerator, map: &mut Map) {
+        let mut drunkard_pos = start.clone();
+        let mut distance_staggered = 0;
+
+        loop {
+            let drunk_idx = map.point2d_to_index(drunkard_pos);
+            map.tiles[drunk_idx] = TileType::Floor;
+
+            match rng.range(0, 4) {
+                0 => drunkard_pos.x -= 1,
+                1 => drunkard_pos.x += 1,
+                2 => drunkard_pos.y -= 1,
+                _ => drunkard_pos.y += 1,
+            }
+            if !map.in_bounds(drunkard_pos) {
+                break;
+            }
+
+            distance_staggered += 1;
+            if distance_staggered > STAGGER_DISTANCE {
+                break;
+            }
+        }
+    }
+}

src/map_builder/empty.rs

@@ -0,0 +1,27 @@
+use super::MapArchitect;
+use crate::prelude::*;
+
+pub struct EmptyArchitect {}
+
+impl MapArchitect for EmptyArchitect {
+    fn new(&mut self, rng: &mut RandomNumberGenerator) -> MapBuilder {
+        let mut mb = MapBuilder {
+            map: Map::new(),
+            rooms: Vec::new(),
+            monster_spawns: Vec::new(),
+            player_start: Point::zero(),
+            amulet_start: Point::zero(),
+            theme: super::themes::DungeonTheme::new(),
+        };
+        mb.fill(TileType::Floor);
+        mb.player_start = Point::new(SCREEN_WIDTH / 2, SCREEN_HEIGHT / 2);
+        mb.amulet_start = mb.find_most_distant(&mb.player_start);
+        for _ in 0..50 {
+            mb.monster_spawns.push(Point::new(
+                rng.range(1, SCREEN_WIDTH),
+                rng.range(1, SCREEN_HEIGHT),
+            ));
+        }
+        mb
+    }
+}

src/map_builder/mod.rs

@@ -1,35 +1,72 @@
+mod automata;
+mod drunkard;
+mod empty;
+mod prefab;
+mod rooms;
+mod themes;
+
 use crate::prelude::*;
+use automata::CellularAutomataArchitect;
+use drunkard::DrunkardsWalkArchitect;
+use empty::EmptyArchitect;
+use prefab::apply_prefab;
+use rooms::RoomsArchitect;
+use themes::*;
 
 const NUM_ROOMS: usize = 20;
 
+trait MapArchitect {
+    fn new(&mut self, rng: &mut RandomNumberGenerator) -> MapBuilder;
+}
+
+pub trait MapTheme: Sync + Send {
+    fn tile_to_render(&self, tile_type: TileType) -> FontCharType;
+}
+
 pub struct MapBuilder {
     pub map: Map,
     pub rooms: Vec<Rect>,
+    pub monster_spawns: Vec<Point>,
     pub player_start: Point,
     pub amulet_start: Point,
+    pub theme: Box<dyn MapTheme>,
 }
 
 impl MapBuilder {
     pub fn new(rng: &mut RandomNumberGenerator) -> Self {
-        let mut mb = MapBuilder {
-            map: Map::new(),
-            rooms: Vec::new(),
-            player_start: Point::zero(),
-            amulet_start: Point::zero(),
+        let mut architect: Box<dyn MapArchitect> = match rng.range(0, 3) {
+            0 => Box::new(DrunkardsWalkArchitect {}),
+            1 => Box::new(RoomsArchitect {}),
+            2 => Box::new(CellularAutomataArchitect {}),
+            _ => Box::new(EmptyArchitect {}),
         };
-        mb.fill(TileType::Wall);
-        mb.build_random_rooms(rng);
-        mb.build_corridors(rng);
-        mb.player_start = mb.rooms[0].center();
+
+        let mut mb = architect.new(rng);
+        apply_prefab(&mut mb, rng);
+
+        mb.theme = match rng.range(0, 2) {
+            0 => DungeonTheme::new(),
+            _ => ForestTheme::new(),
+        };
+
+        mb
+    }
+
+    fn fill(&mut self, tile: TileType) {
+        self.map.tiles.iter_mut().for_each(|t| *t = tile);
+    }
+
+    fn find_most_distant(&self, point: &Point) -> Point {
         let dijkstra_map = DijkstraMap::new(
             SCREEN_WIDTH,
             SCREEN_HEIGHT,
-            &[mb.map.point2d_to_index(mb.player_start)],
-            &mb.map,
+            &[self.map.point2d_to_index(*point)],
+            &self.map,
             1024.0,
         );
+
         const UNREACHABLE: &f32 = &f32::MAX;
-        mb.amulet_start = mb.map.index_to_point2d(
+        self.map.index_to_point2d(
             dijkstra_map
                 .map
                 .iter()
@@ -38,12 +75,7 @@ impl MapBuilder {
                 .max_by(|a, b| a.1.partial_cmp(b.1).unwrap())
                 .unwrap()
                 .0,
-        );
-        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) {
@@ -110,4 +142,28 @@ impl MapBuilder {
             }
         }
     }
+
+    fn spawn_monsters(&self, start: &Point, rng: &mut RandomNumberGenerator) -> Vec<Point> {
+        const NUM_MONSTERS: usize = 50;
+        let mut spawnable_tiles: Vec<Point> = self
+            .map
+            .tiles
+            .iter()
+            .enumerate()
+            .filter(|(idx, t)| {
+                **t == TileType::Floor
+                    && DistanceAlg::Pythagoras.distance2d(*start, self.map.index_to_point2d(*idx))
+                        > 10.0
+            })
+            .map(|(idx, _)| self.map.index_to_point2d(idx))
+            .collect();
+
+        let mut spawns = Vec::new();
+        for _ in 0..NUM_MONSTERS {
+            let target_index = rng.random_slice_index(&spawnable_tiles).unwrap();
+            spawns.push(spawnable_tiles[target_index]);
+            spawnable_tiles.remove(target_index);
+        }
+        spawns
+    }
 }

src/map_builder/prefab.rs

@@ -0,0 +1,84 @@
+use crate::prelude::*;
+
+const FORTRESS: (&str, i32, i32) = (
+    "
+------------
+---######---
+---#----#---
+---#-M--#---
+-###----###-
+--M------M--
+-###----###-
+---#----#---
+---#----#---
+---######---
+------------
+",
+    12,
+    11,
+);
+
+pub fn apply_prefab(mb: &mut MapBuilder, rng: &mut RandomNumberGenerator) {
+    let mut placement = None;
+
+    let dijkstra_map = DijkstraMap::new(
+        SCREEN_WIDTH,
+        SCREEN_HEIGHT,
+        &[mb.map.point2d_to_index(mb.player_start)],
+        &mb.map,
+        1024.0,
+    );
+
+    let mut attempts = 0;
+    while placement.is_none() && attempts < 10 {
+        let dimensions = Rect::with_size(
+            rng.range(0, SCREEN_WIDTH - FORTRESS.1),
+            rng.range(0, SCREEN_HEIGHT - FORTRESS.2),
+            FORTRESS.1,
+            FORTRESS.2,
+        );
+
+        let mut can_place = false;
+        dimensions.for_each(|pt| {
+            let idx = mb.map.point2d_to_index(pt);
+            let distance = dijkstra_map.map[idx];
+            if distance < 2000.0 && distance > 20.0 && mb.amulet_start != pt {
+                can_place = true;
+            }
+        });
+
+        if can_place {
+            placement = Some(Point::new(dimensions.x1, dimensions.y1));
+            let points = dimensions.point_set();
+            mb.monster_spawns.retain(|pt| !points.contains(pt));
+        }
+
+        attempts += 1;
+    }
+
+    if let Some(placement) = placement {
+        let string_vec: Vec<char> = FORTRESS
+            .0
+            .chars()
+            .filter(|a| *a != '\r' && *a != '\n')
+            .collect();
+        let mut i = 0;
+
+        for ty in placement.y..placement.y + FORTRESS.2 {
+            for tx in placement.x..placement.x + FORTRESS.1 {
+                let idx = map_idx(tx, ty);
+                let c = string_vec[i];
+                match c {
+                    'M' => {
+                        mb.map.tiles[idx] = TileType::Floor;
+                        mb.monster_spawns.push(Point::new(tx, ty));
+                    }
+                    '-' => mb.map.tiles[idx] = TileType::Floor,
+                    '#' => mb.map.tiles[idx] = TileType::Wall,
+                    _ => println!("No idea what to do with [{}]", c),
+                }
+                i += 1;
+            }
+        }
+    }
+}

src/map_builder/rooms.rs

@@ -0,0 +1,28 @@
+use super::MapArchitect;
+use crate::prelude::*;
+
+pub struct RoomsArchitect {}
+
+impl MapArchitect for RoomsArchitect {
+    fn new(&mut self, rng: &mut RandomNumberGenerator) -> MapBuilder {
+        let mut mb = MapBuilder {
+            map: Map::new(),
+            rooms: Vec::new(),
+            monster_spawns: Vec::new(),
+            player_start: Point::zero(),
+            amulet_start: Point::zero(),
+            theme: super::themes::DungeonTheme::new(),
+        };
+
+        mb.fill(TileType::Wall);
+        mb.build_random_rooms(rng);
+        mb.build_corridors(rng);
+        mb.player_start = mb.rooms[0].center();
+        mb.amulet_start = mb.find_most_distant(&mb.player_start);
+        for room in mb.rooms.iter().skip(1) {
+            mb.monster_spawns.push(room.center());
+        }
+
+        mb
+    }
+}

src/map_builder/themes.rs

@@ -0,0 +1,35 @@
+use super::MapTheme;
+use crate::prelude::*;
+
+pub struct DungeonTheme {}
+pub struct ForestTheme {}
+
+impl DungeonTheme {
+    pub fn new() -> Box<dyn MapTheme> {
+        Box::new(Self {})
+    }
+}
+
+impl MapTheme for DungeonTheme {
+    fn tile_to_render(&self, tile_type: TileType) -> FontCharType {
+        match tile_type {
+            TileType::Floor => to_cp437('.'),
+            TileType::Wall => to_cp437('#'),
+        }
+    }
+}
+
+impl ForestTheme {
+    pub fn new() -> Box<dyn MapTheme> {
+        Box::new(Self {})
+    }
+}
+
+impl MapTheme for ForestTheme {
+    fn tile_to_render(&self, tile_type: TileType) -> FontCharType {
+        match tile_type {
+            TileType::Floor => to_cp437(';'),
+            TileType::Wall => to_cp437('"'),
+        }
+    }
+}