Add drunkards walk

.idea/workspace.xml

@@ -13,15 +13,11 @@
   </component>
   <component name="ChangeListManager">
     <list default="true" id="a9f5cad0-d253-42e8-a38a-89dfec417dbc" name="Changes" comment="">
-      <change afterPath="$PROJECT_DIR$/src/map_builders/cellular_automata.rs" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/src/map_builders/drunkard.rs" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/components.rs" beforeDir="false" afterPath="$PROJECT_DIR$/src/components.rs" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/savegame.json" beforeDir="false" afterPath="$PROJECT_DIR$/savegame.json" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/map_builders/bsp/mod.rs" beforeDir="false" afterPath="$PROJECT_DIR$/src/map_builders/bsp/mod.rs" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/map_builders/common.rs" beforeDir="false" afterPath="$PROJECT_DIR$/src/map_builders/common.rs" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/map_builders/bsp_dungeon.rs" beforeDir="false" afterPath="$PROJECT_DIR$/src/map_builders/bsp_dungeon.rs" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/map_builders/bsp_interior.rs" beforeDir="false" afterPath="$PROJECT_DIR$/src/map_builders/bsp_interior.rs" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/src/map_builders/mod.rs" beforeDir="false" afterPath="$PROJECT_DIR$/src/map_builders/mod.rs" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/map_builders/simple_map.rs" beforeDir="false" afterPath="$PROJECT_DIR$/src/map_builders/simple_map.rs" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/spawner.rs" beforeDir="false" afterPath="$PROJECT_DIR$/src/spawner.rs" afterDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
@@ -82,7 +78,7 @@
       <option name="number" value="Default" />
       <option name="presentableId" value="Default" />
       <updated>1643546643557</updated>
-      <workItem from="1643546645546" duration="7299000" />
+      <workItem from="1643546645546" duration="12996000" />
     </task>
     <servers />
   </component>

src/map_builders/common.rs

@@ -1,4 +1,5 @@
 use std::cmp::{max, min};
+use std::collections::HashMap;
 
 use crate::rect::Rect;
 use crate::{Map, TileType};
@@ -37,3 +38,53 @@ pub fn reveal_all(map: &Map) -> Map {
     }
     snapshot
 }
+
+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;
+                }
+            }
+        }
+    }
+
+    exit_tile.0
+}
+
+pub fn generate_voronois_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]);
+                }
+            }
+        }
+    }
+
+    noise_areas
+}

src/map_builders/drunkard.rs

@@ -0,0 +1,180 @@
+use std::collections::HashMap;
+use rltk::RandomNumberGenerator;
+use crate::{Map, Position, SHOW_MAPGEN_VISUALIZER, TileType, World};
+use crate::map_builders::common::{generate_voronois_spawn_regions, remove_unreachable_areas_returning_most_distant, reveal_all};
+use crate::map_builders::MapBuilder;
+use crate::spawner::spawn_region;
+
+pub struct DrunkardsWalkBuilder {
+    map: Map,
+    starting_position: Position,
+    depth: i32,
+    history: Vec<Map>,
+    noise_areas: HashMap<i32, Vec<usize>>,
+    settings: DrunkardSettings,
+}
+
+#[derive(PartialEq, Copy, Clone)]
+pub enum DrunkSpawnMode { StartingPoint, Random }
+
+pub struct DrunkardSettings {
+    pub spawn_mode: DrunkSpawnMode,
+    pub drunken_lifetime: i32,
+    pub floor_percent: f32,
+}
+
+impl DrunkardsWalkBuilder {
+    pub fn new(new_depth: i32, settings: DrunkardSettings) -> Self {
+        Self {
+            depth: new_depth,
+            map: Map::new(new_depth),
+            history: Vec::new(),
+            noise_areas: HashMap::new(),
+            starting_position: Position::default(),
+            settings,
+        }
+    }
+
+    pub fn open_area(new_depth: i32) -> Self {
+        DrunkardsWalkBuilder::new(
+            new_depth,
+            DrunkardSettings {
+                spawn_mode: DrunkSpawnMode::StartingPoint,
+                drunken_lifetime: 400,
+                floor_percent: 0.5,
+            },
+        )
+    }
+
+
+    pub fn open_halls(new_depth: i32) -> Self {
+        DrunkardsWalkBuilder::new(
+            new_depth,
+            DrunkardSettings {
+                spawn_mode: DrunkSpawnMode::Random,
+                drunken_lifetime: 400,
+                floor_percent: 0.5,
+            },
+        )
+    }
+
+    pub fn winding_passages(new_depth: i32) -> Self {
+        DrunkardsWalkBuilder::new(
+            new_depth,
+            DrunkardSettings {
+                spawn_mode: DrunkSpawnMode::Random,
+                drunken_lifetime: 100,
+                floor_percent: 0.4,
+            },
+        )
+    }
+
+
+    fn build(&mut self) {
+        let mut rng = RandomNumberGenerator::new();
+
+        self.starting_position = Position::new(self.map.width / 2, 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 = self.starting_position.x;
+            let mut drunk_y = self.starting_position.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::DownStairs;
+
+                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::DownStairs {
+                    *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));
+
+        let exit_tile = remove_unreachable_areas_returning_most_distant(&mut self.map, start_idx);
+        self.take_snapshot();
+
+        self.map.tiles[exit_tile] = TileType::DownStairs;
+        self.take_snapshot();
+
+        self.noise_areas = generate_voronois_spawn_regions(&self.map, &mut rng);
+    }
+}
+
+impl MapBuilder for DrunkardsWalkBuilder {
+    fn build_map(&mut self) {
+        self.build();
+    }
+
+    fn spawn_entities(&mut self, ecs: &mut World) {
+        for area in self.noise_areas.iter() {
+            spawn_region(ecs, area.1, self.depth);
+        }
+    }
+
+    fn get_map(&self) -> Map {
+        self.map.clone()
+    }
+
+    fn get_starting_position(&self) -> Position {
+        self.starting_position.clone()
+    }
+
+    fn get_snapshot_history(&self) -> Vec<Map> {
+        self.history.clone()
+    }
+
+    fn take_snapshot(&mut self) {
+        if SHOW_MAPGEN_VISUALIZER {
+            self.history.push(reveal_all(&self.map))
+        }
+    }
+}

src/map_builders/mod.rs

@@ -5,6 +5,7 @@ use crate::map_builders::bsp_interior::BspInteriorBuilder;
 use crate::map_builders::simple_map::SimpleMapBuilder;
 use crate::{Map, Position};
 use crate::map_builders::cellular_automata::CellularAutomataBuilder;
+use crate::map_builders::drunkard::{DrunkardSettings, DrunkardsWalkBuilder, DrunkSpawnMode};
 
 mod bsp;
 mod bsp_dungeon;
@@ -12,6 +13,7 @@ mod bsp_interior;
 mod cellular_automata;
 mod common;
 mod simple_map;
+mod drunkard;
 
 pub trait MapBuilder {
     fn build_map(&mut self);
@@ -24,9 +26,12 @@ pub trait MapBuilder {
 
 pub fn new_random_builder(new_depth: i32) -> Box<dyn MapBuilder> {
     let mut rng = rltk::RandomNumberGenerator::new();
-    //let builder_choice = rng.roll_dice(1, 4);
+    //let builder_choice = rng.roll_dice(1, 7);
-    let builder_choice = 3;
+    let builder_choice = 4;
     match builder_choice {
+        6 => Box::new(DrunkardsWalkBuilder::open_area(new_depth)),
+        5 => Box::new(DrunkardsWalkBuilder::open_halls(new_depth)),
+        4 => Box::new(DrunkardsWalkBuilder::winding_passages(new_depth)),
         3 => Box::new(CellularAutomataBuilder::new(new_depth)),
         2 => Box::new(BspInteriorBuilder::new(new_depth)),
         1 => Box::new(SimpleMapBuilder::new(new_depth)),