drunkards walk

src/map_builders/cellular_automata.rs

@@ -1,4 +1,7 @@
-use super::{spawner, Map, MapBuilder, Position, TileType, SHOW_MAPGEN};
+use super::{
+    generate_voronoi_spawn_regions, remove_unreachable_areas_returning_most_distant, spawner, Map, MapBuilder,
+    Position, TileType, SHOW_MAPGEN,
+};
 use rltk::RandomNumberGenerator;
 use specs::prelude::*;
 use std::collections::HashMap;
@@ -122,50 +125,15 @@ impl CellularAutomataBuilder {
             start_idx = self.map.xy_idx(self.starting_position.x, self.starting_position.y);
         }
 
-        // Find all tiles we can reach from the starting point
-        let map_starts: Vec<usize> = vec![start_idx];
-        let dijkstra_map = rltk::DijkstraMap::new(self.map.width, self.map.height, &map_starts, &self.map, 200.0);
-        let mut exit_tile = (0, 0.0f32);
-        for (i, tile) in self.map.tiles.iter_mut().enumerate() {
-            if *tile == TileType::Floor {
-                let distance_to_start = dijkstra_map.map[i];
-                // We can't get to this tile - so we'll make it a wall
-                if distance_to_start == std::f32::MAX {
-                    *tile = TileType::Wall;
-                } else {
-                    // If it is further away than our current exit candidate, move the exit
-                    if distance_to_start > exit_tile.1 {
-                        exit_tile.0 = i;
-                        exit_tile.1 = distance_to_start;
-                    }
-                }
-            }
-        }
+        // Find all tiles reachable from starting pos
+        let exit_tile = remove_unreachable_areas_returning_most_distant(&mut self.map, start_idx);
         self.take_snapshot();
 
-        self.map.tiles[exit_tile.0] = TileType::DownStair;
+        // Place stairs
+        self.map.tiles[exit_tile] = TileType::DownStair;
         self.take_snapshot();
 
-        // Build noise map for spawning entities
-        let mut noise = rltk::FastNoise::seeded(rng.roll_dice(1, 65536) as u64);
-        noise.set_noise_type(rltk::NoiseType::Cellular);
-        noise.set_frequency(0.08);
-        noise.set_cellular_distance_function(rltk::CellularDistanceFunction::Manhattan);
-
-        for y in 1..self.map.height - 1 {
-            for x in 1..self.map.width - 1 {
-                let idx = self.map.xy_idx(x, y);
-                if self.map.tiles[idx] == TileType::Floor {
-                    let cell_value_f = noise.get_noise(x as f32, y as f32) * 10240.0;
-                    let cell_value = cell_value_f as i32;
-
-                    if self.noise_areas.contains_key(&cell_value) {
-                        self.noise_areas.get_mut(&cell_value).unwrap().push(idx);
-                    } else {
-                        self.noise_areas.insert(cell_value, vec![idx]);
-                    }
-                }
-            }
-        }
+        // Noise map for spawning entities
+        self.noise_areas = generate_voronoi_spawn_regions(&self.map, rng);
     }
 }

src/map_builders/common.rs

@@ -1,5 +1,6 @@
 use super::{Map, Rect, TileType};
 use std::cmp::{max, min};
+use std::collections::HashMap;
 
 pub fn apply_room_to_map(map: &mut Map, room: &Rect) {
     for y in room.y1 + 1..=room.y2 {
@@ -27,3 +28,52 @@ pub fn apply_vertical_tunnel(map: &mut Map, y1: i32, y2: i32, x: i32) {
         }
     }
 }
+
+pub fn remove_unreachable_areas_returning_most_distant(map: &mut Map, start_idx: usize) -> usize {
+    map.populate_blocked();
+    let map_starts: Vec<usize> = vec![start_idx];
+    let dijkstra_map = rltk::DijkstraMap::new(map.width as usize, map.height as usize, &map_starts, map, 200.0);
+    let mut exit_tile = (0, 0.0f32);
+    for (i, tile) in map.tiles.iter_mut().enumerate() {
+        if *tile == TileType::Floor {
+            let distance_to_start = dijkstra_map.map[i];
+            // We can't get to this tile - so we'll make it a wall
+            if distance_to_start == std::f32::MAX {
+                *tile = TileType::Wall;
+            } else {
+                // If it is further away than our current exit candidate, move the exit
+                if distance_to_start > exit_tile.1 {
+                    exit_tile.0 = i;
+                    exit_tile.1 = distance_to_start;
+                }
+            }
+        }
+    }
+    return exit_tile.0;
+}
+
+#[allow(clippy::map_entry)]
+pub fn generate_voronoi_spawn_regions(map: &Map, rng: &mut rltk::RandomNumberGenerator) -> HashMap<i32, Vec<usize>> {
+    let mut noise_areas: HashMap<i32, Vec<usize>> = HashMap::new();
+    let mut noise = rltk::FastNoise::seeded(rng.roll_dice(1, 65536) as u64);
+    noise.set_noise_type(rltk::NoiseType::Cellular);
+    noise.set_frequency(0.08);
+    noise.set_cellular_distance_function(rltk::CellularDistanceFunction::Manhattan);
+
+    for y in 1..map.height - 1 {
+        for x in 1..map.width - 1 {
+            let idx = map.xy_idx(x, y);
+            if map.tiles[idx] == TileType::Floor {
+                let cell_value_f = noise.get_noise(x as f32, y as f32) * 10240.0;
+                let cell_value = cell_value_f as i32;
+
+                if noise_areas.contains_key(&cell_value) {
+                    noise_areas.get_mut(&cell_value).unwrap().push(idx);
+                } else {
+                    noise_areas.insert(cell_value, vec![idx]);
+                }
+            }
+        }
+    }
+    return noise_areas;
+}

src/map_builders/drunkard.rs

@@ -0,0 +1,214 @@
+use super::{
+    generate_voronoi_spawn_regions, remove_unreachable_areas_returning_most_distant, spawner, Map, MapBuilder,
+    Position, TileType, SHOW_MAPGEN,
+};
+use rltk::RandomNumberGenerator;
+use specs::prelude::*;
+use std::collections::HashMap;
+
+#[derive(PartialEq, Copy, Clone)]
+pub enum DrunkSpawnMode {
+    StartingPoint,
+    Random,
+}
+
+pub struct DrunkardSettings {
+    pub spawn_mode: DrunkSpawnMode,
+    pub drunken_lifetime: i32,
+    pub floor_percent: f32,
+}
+
+pub struct DrunkardsWalkBuilder {
+    map: Map,
+    starting_position: Position,
+    depth: i32,
+    history: Vec<Map>,
+    noise_areas: HashMap<i32, Vec<usize>>,
+    settings: DrunkardSettings,
+}
+
+impl MapBuilder for DrunkardsWalkBuilder {
+    fn build_map(&mut self, rng: &mut RandomNumberGenerator) {
+        return self.build(rng);
+    }
+    fn spawn_entities(&mut self, ecs: &mut World) {
+        for area in self.noise_areas.iter() {
+            spawner::spawn_region(ecs, area.1, self.depth);
+        }
+    }
+    //  Getters
+    fn get_map(&mut self) -> Map {
+        return self.map.clone();
+    }
+    fn get_starting_pos(&mut self) -> Position {
+        return self.starting_position.clone();
+    }
+    // Mapgen visualisation stuff
+    fn get_snapshot_history(&self) -> Vec<Map> {
+        return self.history.clone();
+    }
+    fn take_snapshot(&mut self) {
+        if SHOW_MAPGEN {
+            let mut snapshot = self.map.clone();
+            for v in snapshot.revealed_tiles.iter_mut() {
+                *v = true;
+            }
+            self.history.push(snapshot);
+        }
+    }
+}
+
+impl DrunkardsWalkBuilder {
+    pub fn new(new_depth: i32, settings: DrunkardSettings) -> DrunkardsWalkBuilder {
+        DrunkardsWalkBuilder {
+            map: Map::new(new_depth),
+            starting_position: Position { x: 0, y: 0 },
+            depth: new_depth,
+            history: Vec::new(),
+            noise_areas: HashMap::new(),
+            settings,
+        }
+    }
+
+    pub fn open_area(new_depth: i32) -> DrunkardsWalkBuilder {
+        DrunkardsWalkBuilder {
+            map: Map::new(new_depth),
+            starting_position: Position { x: 0, y: 0 },
+            depth: new_depth,
+            history: Vec::new(),
+            noise_areas: HashMap::new(),
+            settings: DrunkardSettings {
+                spawn_mode: DrunkSpawnMode::StartingPoint,
+                drunken_lifetime: 400,
+                floor_percent: 0.5,
+            },
+        }
+    }
+
+    pub fn open_halls(new_depth: i32) -> DrunkardsWalkBuilder {
+        DrunkardsWalkBuilder {
+            map: Map::new(new_depth),
+            starting_position: Position { x: 0, y: 0 },
+            depth: new_depth,
+            history: Vec::new(),
+            noise_areas: HashMap::new(),
+            settings: DrunkardSettings {
+                spawn_mode: DrunkSpawnMode::Random,
+                drunken_lifetime: 400,
+                floor_percent: 0.5,
+            },
+        }
+    }
+
+    pub fn winding_passages(new_depth: i32) -> DrunkardsWalkBuilder {
+        DrunkardsWalkBuilder {
+            map: Map::new(new_depth),
+            starting_position: Position { x: 0, y: 0 },
+            depth: new_depth,
+            history: Vec::new(),
+            noise_areas: HashMap::new(),
+            settings: DrunkardSettings {
+                spawn_mode: DrunkSpawnMode::Random,
+                drunken_lifetime: 100,
+                floor_percent: 0.4,
+            },
+        }
+    }
+
+    #[allow(clippy::map_entry)]
+    fn build(&mut self, rng: &mut RandomNumberGenerator) {
+        // Central starting pos
+        self.starting_position = Position { x: self.map.width / 2, y: self.map.height / 2 };
+        let start_idx = self.map.xy_idx(self.starting_position.x, self.starting_position.y);
+        self.map.tiles[start_idx] = TileType::Floor;
+
+        let total_tiles = self.map.width * self.map.height;
+        let desired_floor_tiles = (self.settings.floor_percent * total_tiles as f32) as usize;
+        let mut floor_tile_count = self.map.tiles.iter().filter(|a| **a == TileType::Floor).count();
+        let mut digger_count = 0;
+        let mut active_digger_count = 0;
+
+        while floor_tile_count < desired_floor_tiles {
+            let mut did_something = false;
+            let mut drunk_x;
+            let mut drunk_y;
+            match self.settings.spawn_mode {
+                DrunkSpawnMode::StartingPoint => {
+                    drunk_x = self.starting_position.x;
+                    drunk_y = self.starting_position.y;
+                }
+                DrunkSpawnMode::Random => {
+                    if digger_count == 0 {
+                        drunk_x = self.starting_position.x;
+                        drunk_y = self.starting_position.y;
+                    } else {
+                        drunk_x = rng.roll_dice(1, self.map.width - 3) + 1;
+                        drunk_y = rng.roll_dice(1, self.map.height - 3) + 1;
+                    }
+                }
+            }
+            let mut drunk_life = self.settings.drunken_lifetime;
+
+            while drunk_life > 0 {
+                let drunk_idx = self.map.xy_idx(drunk_x, drunk_y);
+                if self.map.tiles[drunk_idx] == TileType::Wall {
+                    did_something = true;
+                }
+                self.map.tiles[drunk_idx] = TileType::DownStair;
+
+                let stagger_direction = rng.roll_dice(1, 4);
+                match stagger_direction {
+                    1 => {
+                        if drunk_x > 2 {
+                            drunk_x -= 1;
+                        }
+                    }
+                    2 => {
+                        if drunk_x < self.map.width - 2 {
+                            drunk_x += 1;
+                        }
+                    }
+                    3 => {
+                        if drunk_y > 2 {
+                            drunk_y -= 1;
+                        }
+                    }
+                    _ => {
+                        if drunk_y < self.map.height - 2 {
+                            drunk_y += 1;
+                        }
+                    }
+                }
+                drunk_life -= 1;
+            }
+            if did_something {
+                self.take_snapshot();
+                active_digger_count += 1;
+            }
+
+            digger_count += 1;
+            for t in self.map.tiles.iter_mut() {
+                if *t == TileType::DownStair {
+                    *t = TileType::Floor;
+                }
+            }
+            floor_tile_count = self.map.tiles.iter().filter(|a| **a == TileType::Floor).count();
+        }
+
+        rltk::console::log(format!(
+            "{} dwarves gave up their sobriety, of whom {} actually found a wall.",
+            digger_count, active_digger_count
+        ));
+
+        // Find all tiles reachable from starting pos
+        let exit_tile = remove_unreachable_areas_returning_most_distant(&mut self.map, start_idx);
+        self.take_snapshot();
+
+        // Place stairs
+        self.map.tiles[exit_tile] = TileType::DownStair;
+        self.take_snapshot();
+
+        // Noise map for spawning entities
+        self.noise_areas = generate_voronoi_spawn_regions(&self.map, rng);
+    }
+}

src/map_builders/mod.rs

@@ -3,6 +3,7 @@ mod bsp_dungeon;
 mod bsp_interior;
 mod cellular_automata;
 mod common;
+mod drunkard;
 mod simple_map;
 use common::*;
 use rltk::RandomNumberGenerator;
@@ -19,11 +20,14 @@ pub trait MapBuilder {
 
 pub fn random_builder(new_depth: i32) -> Box<dyn MapBuilder> {
     let mut rng = rltk::RandomNumberGenerator::new();
-    let builder = rng.roll_dice(1, 4);
+    let builder = rng.roll_dice(1, 7);
     match builder {
         1 => Box::new(bsp_dungeon::BspDungeonBuilder::new(new_depth)),
         2 => Box::new(bsp_interior::BspInteriorBuilder::new(new_depth)),
         3 => Box::new(cellular_automata::CellularAutomataBuilder::new(new_depth)),
+        4 => Box::new(drunkard::DrunkardsWalkBuilder::open_area(new_depth)),
+        5 => Box::new(drunkard::DrunkardsWalkBuilder::open_halls(new_depth)),
+        6 => Box::new(drunkard::DrunkardsWalkBuilder::winding_passages(new_depth)),
         _ => Box::new(simple_map::SimpleMapBuilder::new(new_depth)),
     }
 }