Add DLA map building algorithms, finishing section 4.8

src/map_builders/dla.rs

@@ -0,0 +1,340 @@
+use super::common::{
+    generate_voronoi_spawn_regions, remove_unreachable_areas_returning_most_distant,
+};
+use super::MapBuilder;
+use crate::{components::Position, spawner, Map, TileType, SHOW_MAPGEN_VISUALIZER};
+use rltk::RandomNumberGenerator;
+use specs::prelude::*;
+use std::collections::HashMap;
+
+#[derive(PartialEq, Copy, Clone)]
+pub enum DLAAlgorithm {
+    WalkInwards,
+    WalkOutwards,
+    CentralAttractor,
+}
+
+#[derive(PartialEq, Copy, Clone)]
+#[allow(dead_code)]
+pub enum DLASymmetry {
+    None,
+    Horizontal,
+    Vertical,
+    Both,
+}
+
+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: DLASymmetry,
+    floor_percent: f32,
+}
+
+impl MapBuilder for DLABuilder {
+    fn build_map(&mut self) {
+        self.build();
+    }
+
+    fn spawn_entities(&mut self, ecs: &mut World) {
+        for area in self.noise_areas.iter() {
+            spawner::spawn_region(ecs, area.1, self.depth);
+        }
+    }
+
+    fn get_map(&self) -> Map {
+        self.map.clone()
+    }
+
+    fn get_starting_position(&self) -> Position {
+        self.starting_position
+    }
+
+    fn get_snapshot_history(&self) -> Vec<Map> {
+        self.history.clone()
+    }
+
+    fn take_snapshot(&mut self) {
+        if SHOW_MAPGEN_VISUALIZER {
+            let mut snapshot = self.map.clone();
+            for v in snapshot.revealed_tiles.iter_mut() {
+                *v = true;
+            }
+            self.history.push(snapshot);
+        }
+    }
+}
+
+impl DLABuilder {
+    pub fn new(new_depth: i32) -> DLABuilder {
+        DLABuilder {
+            map: Map::new(new_depth),
+            starting_position: Position::default(),
+            depth: new_depth,
+            history: Vec::new(),
+            noise_areas: HashMap::new(),
+            algorithm: DLAAlgorithm::WalkOutwards,
+            brush_size: 1,
+            symmetry: DLASymmetry::None,
+            floor_percent: 0.25,
+        }
+    }
+
+    pub fn walk_inwards(new_depth: i32) -> DLABuilder {
+        DLABuilder {
+            algorithm: DLAAlgorithm::WalkInwards,
+            ..DLABuilder::new(new_depth)
+        }
+    }
+
+    pub fn walk_outwards(new_depth: i32) -> DLABuilder {
+        DLABuilder {
+            brush_size: 2,
+            ..DLABuilder::new(new_depth)
+        }
+    }
+
+    pub fn central_attractor(new_depth: i32) -> DLABuilder {
+        DLABuilder {
+            algorithm: DLAAlgorithm::CentralAttractor,
+            brush_size: 2,
+            ..DLABuilder::new(new_depth)
+        }
+    }
+
+    pub fn insectoid(new_depth: i32) -> DLABuilder {
+        DLABuilder {
+            algorithm: DLAAlgorithm::CentralAttractor,
+            brush_size: 2,
+            symmetry: DLASymmetry::Horizontal,
+            ..DLABuilder::new(new_depth)
+        }
+    }
+
+    #[allow(clippy::map_entry)]
+    fn build(&mut self) {
+        let mut rng = RandomNumberGenerator::new();
+
+        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();
+
+        // Carve a starting seed
+        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);
+                    }
+
+                    self.paint(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);
+                    }
+
+                    self.paint(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);
+                    }
+
+                    self.paint(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::DownStairs;
+        self.take_snapshot();
+
+        // Now we build a noise map for use in spawning entities later
+        self.noise_areas = generate_voronoi_spawn_regions(&self.map, &mut rng);
+    }
+
+    fn paint(&mut self, x: i32, y: i32) {
+        match self.symmetry {
+            DLASymmetry::None => self.apply_paint(x, y),
+            DLASymmetry::Horizontal => {
+                let center_x = self.map.width / 2;
+                if x == center_x {
+                    self.apply_paint(x, y);
+                } else {
+                    let dist_x = i32::abs(center_x - x);
+                    self.apply_paint(center_x + dist_x, y);
+                    self.apply_paint(center_x - dist_x, y);
+                }
+            }
+            DLASymmetry::Vertical => {
+                let center_y = self.map.height / 2;
+                if y == center_y {
+                    self.apply_paint(x, y);
+                } else {
+                    let dist_y = i32::abs(center_y - y);
+                    self.apply_paint(x, center_y + dist_y);
+                    self.apply_paint(x, center_y - dist_y);
+                }
+            }
+            DLASymmetry::Both => {
+                let center_x = self.map.width / 2;
+                let center_y = self.map.height / 2;
+                if x == center_x && y == center_y {
+                    self.apply_paint(x, y);
+                } else {
+                    let dist_x = i32::abs(center_x - x);
+                    self.apply_paint(center_x + dist_x, y);
+                    self.apply_paint(center_x - dist_x, y);
+                    let dist_y = i32::abs(center_y - y);
+                    self.apply_paint(x, center_y + dist_y);
+                    self.apply_paint(x, center_y - dist_y);
+                }
+            }
+        }
+        let digger_idx = self.map.xy_idx(x, y);
+        self.map.tiles[digger_idx] = TileType::Floor;
+    }
+
+    fn apply_paint(&mut self, x: i32, y: i32) {
+        match self.brush_size {
+            1 => {
+                let digger_idx = self.map.xy_idx(x, y);
+                self.map.tiles[digger_idx] = TileType::Floor;
+            }
+            _ => {
+                let half_brush_size = self.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 < self.map.width - 1
+                            && brush_y > 1
+                            && brush_y < self.map.height - 1
+                        {
+                            let idx = self.map.xy_idx(brush_x, brush_y);
+                            self.map.tiles[idx] = TileType::Floor;
+                        }
+                    }
+                }
+            }
+        }
+    }
+}

src/map_builders/mod.rs

@@ -2,6 +2,7 @@ mod bsp_dungeon;
 mod bsp_interior;
 mod cellular_automata;
 mod common;
+mod dla;
 mod drunkard;
 mod maze;
 mod simple_map;
@@ -11,6 +12,7 @@ use bsp_dungeon::BspDungeonBuilder;
 use bsp_interior::BspInteriorBuilder;
 use cellular_automata::CellularAutomataBuilder;
 use common::*;
+use dla::DLABuilder;
 use drunkard::DrunkardsWalkBuilder;
 use maze::MazeBuilder;
 use simple_map::SimpleMapBuilder;
@@ -27,7 +29,7 @@ pub trait MapBuilder {
 
 pub fn random_builder(new_depth: i32) -> Box<dyn MapBuilder> {
     let mut rng = rltk::RandomNumberGenerator::new();
-    match rng.roll_dice(1, 8) {
+    match rng.roll_dice(1, 12) {
         1 => Box::new(BspDungeonBuilder::new(new_depth)),
         2 => Box::new(BspInteriorBuilder::new(new_depth)),
         3 => Box::new(CellularAutomataBuilder::new(new_depth)),
@@ -35,6 +37,10 @@ pub fn random_builder(new_depth: i32) -> Box<dyn MapBuilder> {
         5 => Box::new(DrunkardsWalkBuilder::open_halls(new_depth)),
         6 => Box::new(DrunkardsWalkBuilder::winding_passages(new_depth)),
         7 => Box::new(MazeBuilder::new(new_depth)),
+        8 => Box::new(DLABuilder::walk_inwards(new_depth)),
+        9 => Box::new(DLABuilder::walk_outwards(new_depth)),
+        10 => Box::new(DLABuilder::central_attractor(new_depth)),
+        11 => Box::new(DLABuilder::insectoid(new_depth)),
         _ => Box::new(SimpleMapBuilder::new(new_depth)),
     }
 }