diffusion-limited aggregation, symmetry, brushes

src/map_builders/common.rs

@@ -77,3 +77,71 @@ pub fn generate_voronoi_spawn_regions(map: &Map, rng: &mut rltk::RandomNumberGen
     }
     return noise_areas;
 }
+
+#[derive(PartialEq, Copy, Clone)]
+pub enum Symmetry {
+    None,
+    Horizontal,
+    Vertical,
+    Both,
+}
+
+pub fn paint(map: &mut Map, mode: Symmetry, brush_size: i32, x: i32, y: i32) {
+    match mode {
+        Symmetry::None => apply_paint(map, brush_size, x, y),
+        Symmetry::Horizontal => {
+            let centre_x = map.width / 2;
+            if x == centre_x {
+                apply_paint(map, brush_size, x, y);
+            } else {
+                let dist_x = i32::abs(centre_x - x);
+                apply_paint(map, brush_size, centre_x + dist_x, y);
+                apply_paint(map, brush_size, centre_x - dist_x, y);
+            }
+        }
+        Symmetry::Vertical => {
+            let centre_y = map.height / 2;
+            if y == centre_y {
+                apply_paint(map, brush_size, x, y);
+            } else {
+                let dist_y = i32::abs(centre_y - y);
+                apply_paint(map, brush_size, x, centre_y + dist_y);
+                apply_paint(map, brush_size, x, centre_y - dist_y);
+            }
+        }
+        Symmetry::Both => {
+            let centre_x = map.width / 2;
+            let centre_y = map.height / 2;
+            if x == centre_x && y == centre_y {
+                apply_paint(map, brush_size, x, y);
+            } else {
+                let dist_x = i32::abs(centre_x - x);
+                apply_paint(map, brush_size, centre_x + dist_x, y);
+                apply_paint(map, brush_size, centre_x - dist_x, y);
+                let dist_y = i32::abs(centre_y - y);
+                apply_paint(map, brush_size, x, centre_y + dist_y);
+                apply_paint(map, brush_size, x, centre_y - dist_y);
+            }
+        }
+    }
+}
+
+fn apply_paint(map: &mut Map, brush_size: i32, x: i32, y: i32) {
+    match brush_size {
+        1 => {
+            let digger_idx = map.xy_idx(x, y);
+            map.tiles[digger_idx] = TileType::Floor;
+        }
+        _ => {
+            let half_brush_size = brush_size / 2;
+            for brush_y in y - half_brush_size..y + half_brush_size {
+                for brush_x in x - half_brush_size..x + half_brush_size {
+                    if brush_x > 1 && brush_x < map.width - 1 && brush_y > 1 && brush_y < map.height - 1 {
+                        let idx = map.xy_idx(brush_x, brush_y);
+                        map.tiles[idx] = TileType::Floor;
+                    }
+                }
+            }
+        }
+    }
+}

src/map_builders/dla.rs

@@ -0,0 +1,241 @@
+use super::{
+    common::Symmetry, generate_voronoi_spawn_regions, paint, 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 DLAAlgorithm {
+    WalkInwards,
+    WalkOutwards,
+    CentralAttractor,
+}
+
+pub struct DLABuilder {
+    map: Map,
+    starting_position: Position,
+    depth: i32,
+    history: Vec<Map>,
+    noise_areas: HashMap<i32, Vec<usize>>,
+    algorithm: DLAAlgorithm,
+    brush_size: i32,
+    symmetry: Symmetry,
+    floor_percent: f32,
+}
+
+impl MapBuilder for DLABuilder {
+    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 DLABuilder {
+    pub fn walk_inwards(new_depth: i32) -> DLABuilder {
+        DLABuilder {
+            map: Map::new(new_depth),
+            starting_position: Position { x: 0, y: 0 },
+            depth: new_depth,
+            history: Vec::new(),
+            noise_areas: HashMap::new(),
+            algorithm: DLAAlgorithm::WalkInwards,
+            brush_size: 1,
+            symmetry: Symmetry::None,
+            floor_percent: 0.25,
+        }
+    }
+
+    pub fn walk_outwards(new_depth: i32) -> DLABuilder {
+        DLABuilder {
+            map: Map::new(new_depth),
+            starting_position: Position { x: 0, y: 0 },
+            depth: new_depth,
+            history: Vec::new(),
+            noise_areas: HashMap::new(),
+            algorithm: DLAAlgorithm::WalkOutwards,
+            brush_size: 2,
+            symmetry: Symmetry::None,
+            floor_percent: 0.25,
+        }
+    }
+
+    pub fn central_attractor(new_depth: i32) -> DLABuilder {
+        DLABuilder {
+            map: Map::new(new_depth),
+            starting_position: Position { x: 0, y: 0 },
+            depth: new_depth,
+            history: Vec::new(),
+            noise_areas: HashMap::new(),
+            algorithm: DLAAlgorithm::CentralAttractor,
+            brush_size: 2,
+            symmetry: Symmetry::None,
+            floor_percent: 0.25,
+        }
+    }
+
+    pub fn insectoid(new_depth: i32) -> DLABuilder {
+        DLABuilder {
+            map: Map::new(new_depth),
+            starting_position: Position { x: 0, y: 0 },
+            depth: new_depth,
+            history: Vec::new(),
+            noise_areas: HashMap::new(),
+            algorithm: DLAAlgorithm::CentralAttractor,
+            brush_size: 2,
+            symmetry: Symmetry::Horizontal,
+            floor_percent: 0.25,
+        }
+    }
+
+    #[allow(clippy::map_entry)]
+    fn build(&mut self, rng: &mut RandomNumberGenerator) {
+        // Carve starting seed
+        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.take_snapshot();
+        self.map.tiles[start_idx] = TileType::Floor;
+        self.map.tiles[start_idx - 1] = TileType::Floor;
+        self.map.tiles[start_idx + 1] = TileType::Floor;
+        self.map.tiles[start_idx - self.map.width as usize] = TileType::Floor;
+        self.map.tiles[start_idx + self.map.width as usize] = TileType::Floor;
+
+        // Random walker
+        let total_tiles = self.map.width * self.map.height;
+        let desired_floor_tiles = (self.floor_percent * total_tiles as f32) as usize;
+        let mut floor_tile_count = self.map.tiles.iter().filter(|a| **a == TileType::Floor).count();
+        while floor_tile_count < desired_floor_tiles {
+            match self.algorithm {
+                DLAAlgorithm::WalkInwards => {
+                    let mut digger_x = rng.roll_dice(1, self.map.width - 3) + 1;
+                    let mut digger_y = rng.roll_dice(1, self.map.height - 3) + 1;
+                    let mut prev_x = digger_x;
+                    let mut prev_y = digger_y;
+                    let mut digger_idx = self.map.xy_idx(digger_x, digger_y);
+                    while self.map.tiles[digger_idx] == TileType::Wall {
+                        prev_x = digger_x;
+                        prev_y = digger_y;
+                        let stagger_direction = rng.roll_dice(1, 4);
+                        match stagger_direction {
+                            1 => {
+                                if digger_x > 2 {
+                                    digger_x -= 1;
+                                }
+                            }
+                            2 => {
+                                if digger_x < self.map.width - 2 {
+                                    digger_x += 1;
+                                }
+                            }
+                            3 => {
+                                if digger_y > 2 {
+                                    digger_y -= 1;
+                                }
+                            }
+                            _ => {
+                                if digger_y < self.map.height - 2 {
+                                    digger_y += 1;
+                                }
+                            }
+                        }
+                        digger_idx = self.map.xy_idx(digger_x, digger_y);
+                    }
+                    paint(&mut self.map, self.symmetry, self.brush_size, prev_x, prev_y);
+                }
+                DLAAlgorithm::WalkOutwards => {
+                    let mut digger_x = self.starting_position.x;
+                    let mut digger_y = self.starting_position.y;
+                    let mut digger_idx = self.map.xy_idx(digger_x, digger_y);
+                    while self.map.tiles[digger_idx] == TileType::Floor {
+                        let stagger_direction = rng.roll_dice(1, 4);
+                        match stagger_direction {
+                            1 => {
+                                if digger_x > 2 {
+                                    digger_x -= 1;
+                                }
+                            }
+                            2 => {
+                                if digger_x < self.map.width - 2 {
+                                    digger_x += 1;
+                                }
+                            }
+                            3 => {
+                                if digger_y > 2 {
+                                    digger_y -= 1;
+                                }
+                            }
+                            _ => {
+                                if digger_y < self.map.height - 2 {
+                                    digger_y += 1;
+                                }
+                            }
+                        }
+                        digger_idx = self.map.xy_idx(digger_x, digger_y);
+                    }
+                    paint(&mut self.map, self.symmetry, self.brush_size, digger_x, digger_y);
+                }
+                DLAAlgorithm::CentralAttractor => {
+                    let mut digger_x = rng.roll_dice(1, self.map.width - 3) + 1;
+                    let mut digger_y = rng.roll_dice(1, self.map.height - 3) + 1;
+                    let mut prev_x = digger_x;
+                    let mut prev_y = digger_y;
+                    let mut digger_idx = self.map.xy_idx(digger_x, digger_y);
+
+                    let mut path = rltk::line2d(
+                        rltk::LineAlg::Bresenham,
+                        rltk::Point::new(digger_x, digger_y),
+                        rltk::Point::new(self.starting_position.x, self.starting_position.y),
+                    );
+
+                    while self.map.tiles[digger_idx] == TileType::Wall && !path.is_empty() {
+                        prev_x = digger_x;
+                        prev_y = digger_y;
+                        digger_x = path[0].x;
+                        digger_y = path[0].y;
+                        path.remove(0);
+                        digger_idx = self.map.xy_idx(digger_x, digger_y);
+                    }
+                    paint(&mut self.map, self.symmetry, self.brush_size, prev_x, prev_y);
+                }
+                _ => {}
+            }
+            self.take_snapshot();
+            floor_tile_count = self.map.tiles.iter().filter(|a| **a == TileType::Floor).count();
+        }
+        // Find all tiles we can reach from the starting point
+        let exit_tile = remove_unreachable_areas_returning_most_distant(&mut self.map, start_idx);
+        self.take_snapshot();
+
+        // Place the stairs
+        self.map.tiles[exit_tile] = TileType::DownStair;
+        self.take_snapshot();
+
+        // Now we build a noise map for use in spawning entities later
+        self.noise_areas = generate_voronoi_spawn_regions(&self.map, rng);
+    }
+}

src/map_builders/drunkard.rs

@@ -1,6 +1,6 @@
 use super::{
-    generate_voronoi_spawn_regions, remove_unreachable_areas_returning_most_distant, spawner, Map, MapBuilder,
-    Position, TileType, SHOW_MAPGEN,
+    generate_voronoi_spawn_regions, paint, remove_unreachable_areas_returning_most_distant, spawner, Map, MapBuilder,
+    Position, Symmetry, TileType, SHOW_MAPGEN,
 };
 use rltk::RandomNumberGenerator;
 use specs::prelude::*;
@@ -16,6 +16,8 @@ pub struct DrunkardSettings {
     pub spawn_mode: DrunkSpawnMode,
     pub drunken_lifetime: i32,
     pub floor_percent: f32,
+    pub brush_size: i32,
+    pub symmetry: Symmetry,
 }
 
 pub struct DrunkardsWalkBuilder {
@@ -59,17 +61,6 @@ impl MapBuilder for DrunkardsWalkBuilder {
 }
 
 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),
@@ -81,6 +72,8 @@ impl DrunkardsWalkBuilder {
                 spawn_mode: DrunkSpawnMode::StartingPoint,
                 drunken_lifetime: 400,
                 floor_percent: 0.5,
+                brush_size: 1,
+                symmetry: Symmetry::None,
             },
         }
     }
@@ -96,6 +89,8 @@ impl DrunkardsWalkBuilder {
                 spawn_mode: DrunkSpawnMode::Random,
                 drunken_lifetime: 400,
                 floor_percent: 0.5,
+                brush_size: 1,
+                symmetry: Symmetry::None,
             },
         }
     }
@@ -111,6 +106,42 @@ impl DrunkardsWalkBuilder {
                 spawn_mode: DrunkSpawnMode::Random,
                 drunken_lifetime: 100,
                 floor_percent: 0.4,
+                brush_size: 1,
+                symmetry: Symmetry::None,
+            },
+        }
+    }
+
+    pub fn fat_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,
+                brush_size: 2,
+                symmetry: Symmetry::None,
+            },
+        }
+    }
+
+    pub fn fearful_symmetry(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,
+                brush_size: 1,
+                symmetry: Symmetry::Both,
             },
         }
     }
@@ -154,6 +185,7 @@ impl DrunkardsWalkBuilder {
                 if self.map.tiles[drunk_idx] == TileType::Wall {
                     did_something = true;
                 }
+                paint(&mut self.map, self.settings.symmetry, self.settings.brush_size, drunk_x, drunk_y);
                 self.map.tiles[drunk_idx] = TileType::DownStair;
 
                 let stagger_direction = rng.roll_dice(1, 4);

src/map_builders/mod.rs

@@ -3,6 +3,7 @@ mod bsp_dungeon;
 mod bsp_interior;
 mod cellular_automata;
 mod common;
+mod dla;
 mod drunkard;
 mod maze;
 mod simple_map;
@@ -20,8 +21,8 @@ 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, 8);
+    /*let mut rng = rltk::RandomNumberGenerator::new();
+    let builder = rng.roll_dice(1, 14);
     match builder {
         1 => Box::new(bsp_dungeon::BspDungeonBuilder::new(new_depth)),
         2 => Box::new(bsp_interior::BspInteriorBuilder::new(new_depth)),
@@ -29,8 +30,14 @@ pub fn random_builder(new_depth: i32) -> Box<dyn MapBuilder> {
         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)),
+        6 => Box::new(drunkard::DrunkardsWalkBuilder::fat_passages(new_depth)),
+        6 => Box::new(drunkard::DrunkardsWalkBuilder::fearful_symmetry(new_depth)),
         7 => Box::new(maze::MazeBuilder::new(new_depth)),
+        8 => Box::new(dla::DLABuilder::walk_inwards(new_depth)),
+        9 => Box::new(dla::DLABuilder::walk_outwards(new_depth)),
+        10 => Box::new(dla::DLABuilder::central_attractor(new_depth)),
+        11 => Box::new(dla::DLABuilder::insectoid(new_depth)),
         _ => Box::new(simple_map::SimpleMapBuilder::new(new_depth)),
-    }
-    //Box::new(drunkard::DrunkardsWalkBuilder::winding_passages(new_depth))
+    }*/
+    Box::new(drunkard::DrunkardsWalkBuilder::fearful_symmetry(new_depth))
 }