Finish generating the empty town map, completing section 5.4

src/camera.rs

@@ -143,6 +143,7 @@ fn get_tile_glyph(idx: usize, map: &Map) -> (rltk::FontCharType, RGB, RGB) {
         TileType::Grass => (rltk::to_cp437('"'), RGB::named(rltk::GREEN)),
         TileType::ShallowWater => (rltk::to_cp437('≈'), RGB::named(rltk::CYAN)),
         TileType::DeepWater => (rltk::to_cp437('≈'), RGB::named(rltk::NAVY_BLUE)),
+        TileType::Gravel => (rltk::to_cp437(';'), RGB::named(rltk::GRAY)),
     };
 
     if map.bloodstains.contains(&idx) {

src/map/tiletype.rs

@@ -11,6 +11,7 @@ pub enum TileType {
     DeepWater,
     WoodFloor,
     Bridge,
+    Gravel,
 }
 
 pub fn tile_walkable(tt: TileType) -> bool {
@@ -23,6 +24,7 @@ pub fn tile_walkable(tt: TileType) -> bool {
             | TileType::ShallowWater
             | TileType::WoodFloor
             | TileType::Bridge
+            | TileType::Gravel
     )
 }
 

src/map_builders/town.rs

@@ -1,23 +1,18 @@
-use ::rltk::RandomNumberGenerator;
+use std::collections::HashSet;
+
+use ::rltk::{Point, RandomNumberGenerator};
 
 use super::{BuilderChain, BuilderMap, InitialMapBuilder};
-use crate::map_builders::area_starting_points::AreaStartingPosition;
-use crate::map_builders::distant_exit::DistantExit;
-use crate::TileType;
+use crate::{Position, TileType};
 
 pub fn town_builder(
     new_depth: i32,
-    rng: &mut RandomNumberGenerator,
+    _rng: &mut RandomNumberGenerator,
     width: i32,
     height: i32,
 ) -> BuilderChain {
-    let (start_x, start_y) = super::random_start_position(rng);
     let mut chain = BuilderChain::new(new_depth, width, height);
-
-    chain
-        .start_with(TownBuilder::new())
-        .with(AreaStartingPosition::new(start_x, start_y))
-        .with(DistantExit::new());
+    chain.start_with(TownBuilder::new());
 
     chain
 }
@@ -45,6 +40,29 @@ impl TownBuilder {
             *t = true;
         }
         build_data.take_snapshot();
+
+        let (mut available_building_tiles, wall_gap_y) = self.town_walls(rng, build_data);
+        let mut buildings = self.buildings(rng, build_data, &mut available_building_tiles);
+        let doors = self.add_doors(rng, build_data, &mut buildings, wall_gap_y);
+
+        self.add_paths(build_data, &doors);
+
+        let exit_idx = build_data.map.xy_idx(build_data.width - 5, wall_gap_y);
+        build_data.map.tiles[exit_idx] = TileType::DownStairs;
+
+        // Sort buildings by size
+        let mut building_size: Vec<(usize, i32)> = Vec::new();
+        for (i, building) in buildings.iter().enumerate() {
+            building_size.push((i, building.2 * building.3));
+        }
+        building_size.sort_by(|a, b| b.1.cmp(&a.1));
+
+        // Start in the pub
+        let the_pub = &buildings[building_size[0].0];
+        build_data.starting_position = Some(Position {
+            x: the_pub.0 + (the_pub.2 / 2),
+            y: the_pub.1 + (the_pub.3 / 2),
+        })
     }
 
     fn grass_layer(&mut self, build_data: &mut BuilderMap) {
@@ -86,4 +104,199 @@ impl TownBuilder {
         }
         build_data.take_snapshot();
     }
+
+    fn town_walls(
+        &mut self,
+        rng: &mut RandomNumberGenerator,
+        build_data: &mut BuilderMap,
+    ) -> (HashSet<usize>, i32) {
+        let mut available_building_tiles: HashSet<usize> = HashSet::new();
+        let wall_gap_y = rng.roll_dice(1, build_data.height - 9) + 5;
+        for y in 1..build_data.height - 2 {
+            if !(y > wall_gap_y - 4 && y < wall_gap_y + 4) {
+                let idx = build_data.map.xy_idx(30, y);
+                build_data.map.tiles[idx] = TileType::Wall;
+                build_data.map.tiles[idx - 1] = TileType::Floor;
+
+                let idx_right = build_data.map.xy_idx(build_data.width - 2, y);
+                build_data.map.tiles[idx_right] = TileType::Wall;
+
+                for x in 31..build_data.width - 2 {
+                    let gravel_idx = build_data.map.xy_idx(x, y);
+                    build_data.map.tiles[gravel_idx] = TileType::Gravel;
+                    if y > 2 && y < build_data.height - 1 {
+                        available_building_tiles.insert(gravel_idx);
+                    }
+                }
+            } else {
+                for x in 30..build_data.width {
+                    let road_idx = build_data.map.xy_idx(x, y);
+                    build_data.map.tiles[road_idx] = TileType::Road;
+                }
+            }
+        }
+        build_data.take_snapshot();
+
+        for x in 30..build_data.width - 1 {
+            let idx_top = build_data.map.xy_idx(x, 1);
+            let idx_bot = build_data.map.xy_idx(x, build_data.height - 2);
+            build_data.map.tiles[idx_top] = TileType::Wall;
+            build_data.map.tiles[idx_bot] = TileType::Wall;
+        }
+        build_data.take_snapshot();
+
+        (available_building_tiles, wall_gap_y)
+    }
+
+    fn buildings(
+        &mut self,
+        rng: &mut RandomNumberGenerator,
+        build_data: &mut BuilderMap,
+        available_building_tiles: &mut HashSet<usize>,
+    ) -> Vec<(i32, i32, i32, i32)> {
+        let mut buildings = Vec::new();
+        let mut n_buildings = 0;
+
+        while n_buildings < 12 {
+            let bx = rng.roll_dice(1, build_data.map.width - 32) + 30;
+            let by = rng.roll_dice(1, build_data.map.height) - 2;
+            let bw = rng.roll_dice(1, 8) + 4;
+            let bh = rng.roll_dice(1, 8) + 4;
+            let mut possible = true;
+
+            for y in by..by + bh {
+                for x in bx..bx + bw {
+                    if x < 0 || x > build_data.width - 1 || y < 0 || y > build_data.height - 1 {
+                        possible = false;
+                    } else {
+                        let idx = build_data.map.xy_idx(x, y);
+                        if !available_building_tiles.contains(&idx) {
+                            possible = false;
+                        }
+                    }
+                }
+            }
+
+            if possible {
+                n_buildings += 1;
+                buildings.push((bx, by, bw, bh));
+                for y in by..by + bh {
+                    for x in bx..bx + bw {
+                        let idx = build_data.map.xy_idx(x, y);
+                        build_data.map.tiles[idx] = TileType::WoodFloor;
+
+                        available_building_tiles.remove(&idx);
+                        available_building_tiles.remove(&(idx + 1));
+                        available_building_tiles.remove(&(idx + build_data.width as usize));
+                        available_building_tiles.remove(&(idx - 1));
+                        available_building_tiles.remove(&(idx - build_data.width as usize));
+                    }
+                }
+                build_data.take_snapshot();
+            }
+        }
+
+        // Outline buildings
+        let mut mapclone = build_data.map.clone();
+        for y in 2..build_data.height - 2 {
+            for x in 32..build_data.width - 2 {
+                let idx = build_data.map.xy_idx(x, y);
+                if build_data.map.tiles[idx] == TileType::WoodFloor {
+                    let mut neighbors = 0;
+                    if build_data.map.tiles[idx - 1] != TileType::WoodFloor {
+                        neighbors += 1;
+                    }
+                    if build_data.map.tiles[idx + 1] != TileType::WoodFloor {
+                        neighbors += 1;
+                    }
+                    if build_data.map.tiles[idx - build_data.width as usize] != TileType::WoodFloor
+                    {
+                        neighbors += 1;
+                    }
+                    if build_data.map.tiles[idx + build_data.width as usize] != TileType::WoodFloor
+                    {
+                        neighbors += 1;
+                    }
+                    if neighbors > 0 {
+                        mapclone.tiles[idx] = TileType::Wall;
+                    }
+                }
+            }
+        }
+        build_data.map = mapclone;
+        build_data.take_snapshot();
+
+        buildings
+    }
+
+    fn add_doors(
+        &mut self,
+        rng: &mut RandomNumberGenerator,
+        build_data: &mut BuilderMap,
+        buildings: &mut Vec<(i32, i32, i32, i32)>,
+        wall_gap_y: i32,
+    ) -> Vec<usize> {
+        let mut doors = Vec::new();
+        for building in buildings.iter() {
+            let door_x = building.0 + 1 + rng.roll_dice(1, building.2 - 3);
+            let cy = building.1 + (building.3 / 2);
+            let idx = if cy > wall_gap_y {
+                // Door on the north wall
+                build_data.map.xy_idx(door_x, building.1)
+            } else {
+                build_data.map.xy_idx(door_x, building.1 + building.3 - 1)
+            };
+            build_data.map.tiles[idx] = TileType::Floor;
+            build_data.spawn_list.push((idx, "Door".to_string()));
+            doors.push(idx);
+        }
+        build_data.take_snapshot();
+
+        doors
+    }
+
+    fn add_paths(&mut self, build_data: &mut BuilderMap, doors: &[usize]) {
+        let mut roads = Vec::new();
+        for y in 0..build_data.height {
+            for x in 0..build_data.width {
+                let idx = build_data.map.xy_idx(x, y);
+                if build_data.map.tiles[idx] == TileType::Road {
+                    roads.push(idx);
+                }
+            }
+        }
+
+        build_data.map.populate_blocked();
+        for door_idx in doors.iter() {
+            let mut nearest_roads: Vec<(usize, f32)> = Vec::new();
+            let door_pt = Point::new(
+                *door_idx as i32 % build_data.map.width as i32,
+                *door_idx as i32 / build_data.map.width as i32,
+            );
+            for r in roads.iter() {
+                nearest_roads.push((
+                    *r,
+                    ::rltk::DistanceAlg::PythagorasSquared.distance2d(
+                        door_pt,
+                        Point::new(
+                            *r as i32 % build_data.map.width,
+                            *r as i32 / build_data.map.width as i32,
+                        ),
+                    ),
+                ));
+            }
+            nearest_roads.sort_by(|a, b| a.1.partial_cmp(&b.1).unwrap());
+
+            let destination = nearest_roads[0].0;
+            let path = ::rltk::a_star_search(*door_idx, destination, &build_data.map);
+            if path.success {
+                for step in path.steps.iter() {
+                    let idx = *step as usize;
+                    build_data.map.tiles[idx] = TileType::Road;
+                    roads.push(idx);
+                }
+            }
+            build_data.take_snapshot();
+        }
+    }
 }