drunkards walk

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);
+    }
+}