fixed corredor masks and added corredor width options

src/exporter.rs

@@ -6,7 +6,7 @@ use image::{DynamicImage, ImageFormat, RgbaImage, imageops::FilterType};
 use rfd::FileDialog;
 use tiny_skia::{FillRule, Paint, PathBuilder, Pixmap, Rect, Stroke, StrokeDash, Transform};
 
-use crate::layout::{Door, DungeonLayout, Room};
+use crate::layout::{Door, DungeonLayout, Room, corridor_cells};
 use crate::ui::{ExportFormat, MaskFormat, UiSettings};
 
 const BG: (u8, u8, u8, u8) = (24, 24, 26, 255);
@@ -83,24 +83,21 @@ struct SceneData {
     corridor_cells: HashSet<(usize, usize)>,
     corridor_edges: HashSet<((usize, usize), (usize, usize))>,
     room_cells: HashSet<(usize, usize)>,
+    room_edges: HashSet<((usize, usize), (usize, usize))>,
     door_edges: HashSet<((usize, usize), (usize, usize))>,
 }
 
-fn collect_scene_data(layout: &DungeonLayout) -> SceneData {
+fn collect_scene_data(layout: &DungeonLayout, settings: &UiSettings) -> SceneData {
     let mut scene = SceneData::default();
 
     for door in &layout.doors {
-        scene.door_edges.insert(norm_edge(door.from, door.to));
+        for edge in door_edges_for(door, settings.cols, settings.rows) {
+            scene.door_edges.insert(edge);
+        }
     }
 
-    for corridor in &layout.corridors {
-        for &cell in &corridor.path {
-            scene.corridor_cells.insert(cell);
-        }
-        for pair in corridor.path.windows(2) {
-            scene.corridor_edges.insert(norm_edge(pair[0], pair[1]));
-        }
-    }
+    scene.corridor_cells = corridor_cells(layout, settings.cols, settings.rows);
+    scene.corridor_edges = corridor_edges_from_cells(&scene.corridor_cells);
 
     for room in &layout.rooms {
         for x in room.x..(room.x + room.width) {
@@ -109,6 +106,7 @@ fn collect_scene_data(layout: &DungeonLayout) -> SceneData {
             }
         }
     }
+    scene.room_edges = room_edges_from_rooms(&layout.rooms);
 
     scene
 }
@@ -168,7 +166,7 @@ pub fn export_with_dialog(
 
 fn render_pixmap(layout: &DungeonLayout, settings: &UiSettings) -> Result<Pixmap, String> {
     let g = ExportGeometry::new(settings.cols, settings.rows);
-    let scene = collect_scene_data(layout);
+    let scene = collect_scene_data(layout, settings);
     let mut pixmap =
         Pixmap::new(g.width, g.height).ok_or_else(|| "Failed to allocate canvas".to_string())?;
     fill_bg(&mut pixmap, BG);
@@ -206,7 +204,7 @@ fn render_pixmap(layout: &DungeonLayout, settings: &UiSettings) -> Result<Pixmap
         &mut pixmap,
         &g,
         &scene.room_cells,
-        None,
+        Some(&scene.room_edges),
         &scene.door_edges,
         wall_w,
         BLACK,
@@ -243,7 +241,7 @@ fn export_composite_masks(
     std::fs::create_dir_all(folder).map_err(|e| format!("Failed creating folder: {e}"))?;
 
     let g = ExportGeometry::new(settings.cols, settings.rows);
-    let scene = collect_scene_data(layout);
+    let scene = collect_scene_data(layout, settings);
     let wall_w = (g.cell / 5.0).max(1.0);
     let door_w = (g.cell / 10.0).max(1.0);
 
@@ -401,22 +399,18 @@ fn build_svg(layout: &DungeonLayout, settings: &UiSettings) -> String {
         );
     }
 
-    let mut corridor_cells = HashSet::new();
-    let mut corridor_edges = HashSet::new();
+    let corridor_cells = corridor_cells(layout, settings.cols, settings.rows);
+    let corridor_edges = corridor_edges_from_cells(&corridor_cells);
     let mut room_cells = HashSet::new();
+    let room_edges = room_edges_from_rooms(&layout.rooms);
     let mut door_edges = HashSet::new();
 
     for door in &layout.doors {
-        door_edges.insert(norm_edge(door.from, door.to));
-    }
-    for corridor in &layout.corridors {
-        for &cell in &corridor.path {
-            corridor_cells.insert(cell);
-        }
-        for pair in corridor.path.windows(2) {
-            corridor_edges.insert(norm_edge(pair[0], pair[1]));
+        for edge in door_edges_for(door, settings.cols, settings.rows) {
+            door_edges.insert(edge);
         }
     }
+    // corridor_cells/corridor_edges already populated with corridor widths
     for room in &layout.rooms {
         for x in room.x..(room.x + room.width) {
             for y in room.y..(room.y + room.height) {
@@ -486,7 +480,14 @@ fn build_svg(layout: &DungeonLayout, settings: &UiSettings) -> String {
         &door_edges,
         wall_w,
     );
-    append_svg_walls(&mut s, &g, &room_cells, None, &door_edges, wall_w);
+    append_svg_walls(
+        &mut s,
+        &g,
+        &room_cells,
+        Some(&room_edges),
+        &door_edges,
+        wall_w,
+    );
 
     for door in &layout.doors {
         let (color, dash) = if settings.colorblind_mode {
@@ -505,7 +506,7 @@ fn build_svg(layout: &DungeonLayout, settings: &UiSettings) -> String {
             ("rgb(220,70,70)", None)
         };
 
-        if let Some((x1, y1, x2, y2)) = door_line_points(&g, door.from, door.to) {
+        if let Some((x1, y1, x2, y2)) = door_line_points(&g, door.from, door.to, door.width) {
             if let Some(pattern) = dash {
                 let _ = writeln!(
                     s,
@@ -847,7 +848,7 @@ fn draw_door(
     color: (u8, u8, u8, u8),
     style: DoorStyle,
 ) {
-    let Some((x1, y1, x2, y2)) = door_line_points(g, door.from, door.to) else {
+    let Some((x1, y1, x2, y2)) = door_line_points(g, door.from, door.to, door.width) else {
         return;
     };
     draw_line(pixmap, x1, y1, x2, y2, width, color, style);
@@ -857,22 +858,31 @@ fn door_line_points(
     g: &ExportGeometry,
     a: (usize, usize),
     b: (usize, usize),
+    width_cells: usize,
 ) -> Option<(f32, f32, f32, f32)> {
     if a.0.abs_diff(b.0) + a.1.abs_diff(b.1) != 1 {
         return None;
     }
 
+    let width_cells = width_cells.max(1) as isize;
+    let min_offset = -((width_cells - 1) / 2);
+    let max_offset = width_cells / 2;
+
     if a.0 != b.0 {
         let x = g.left() + (a.0.max(b.0) as f32) * g.cell;
-        let row = a.1;
-        let y0 = g.top() + row as f32 * g.cell;
-        let y1 = y0 + g.cell;
+        let row = a.1 as isize;
+        let y0_cell = (row + min_offset).clamp(0, g.rows.saturating_sub(1) as isize);
+        let y1_cell = (row + max_offset).clamp(0, g.rows.saturating_sub(1) as isize);
+        let y0 = g.top() + y0_cell as f32 * g.cell;
+        let y1 = g.top() + (y1_cell as f32 + 1.0) * g.cell;
         Some((x, y0, x, y1))
     } else {
         let y = g.top() + (a.1.max(b.1) as f32) * g.cell;
-        let col = a.0;
-        let x0 = g.left() + col as f32 * g.cell;
-        let x1 = x0 + g.cell;
+        let col = a.0 as isize;
+        let x0_cell = (col + min_offset).clamp(0, g.cols.saturating_sub(1) as isize);
+        let x1_cell = (col + max_offset).clamp(0, g.cols.saturating_sub(1) as isize);
+        let x0 = g.left() + x0_cell as f32 * g.cell;
+        let x1 = g.left() + (x1_cell as f32 + 1.0) * g.cell;
         Some((x0, y, x1, y))
     }
 }
@@ -954,3 +964,76 @@ fn dotted_line(
 fn norm_edge(a: (usize, usize), b: (usize, usize)) -> ((usize, usize), (usize, usize)) {
     if a <= b { (a, b) } else { (b, a) }
 }
+
+fn corridor_edges_from_cells(
+    corridor_cells: &HashSet<(usize, usize)>,
+) -> HashSet<((usize, usize), (usize, usize))> {
+    let mut edges = HashSet::new();
+    for &(col, row) in corridor_cells {
+        let right = (col + 1, row);
+        let bottom = (col, row + 1);
+        if corridor_cells.contains(&right) {
+            edges.insert(norm_edge((col, row), right));
+        }
+        if corridor_cells.contains(&bottom) {
+            edges.insert(norm_edge((col, row), bottom));
+        }
+    }
+    edges
+}
+
+fn room_edges_from_rooms(rooms: &[Room]) -> HashSet<((usize, usize), (usize, usize))> {
+    let mut edges = HashSet::new();
+    for room in rooms {
+        let x_end = room.x + room.width;
+        let y_end = room.y + room.height;
+        for x in room.x..x_end {
+            for y in room.y..y_end {
+                if x + 1 < x_end {
+                    edges.insert(norm_edge((x, y), (x + 1, y)));
+                }
+                if y + 1 < y_end {
+                    edges.insert(norm_edge((x, y), (x, y + 1)));
+                }
+            }
+        }
+    }
+    edges
+}
+
+fn door_edges_for(door: &Door, cols: usize, rows: usize) -> Vec<((usize, usize), (usize, usize))> {
+    let mut edges = Vec::new();
+    if door.from.0.abs_diff(door.to.0) + door.from.1.abs_diff(door.to.1) != 1 {
+        return edges;
+    }
+
+    let width = door.width.max(1) as isize;
+    let min_offset = -((width - 1) / 2);
+    let max_offset = width / 2;
+
+    if door.from.0 != door.to.0 {
+        let y = door.from.1 as isize;
+        for dy in min_offset..=max_offset {
+            let ny = y + dy;
+            if ny < 0 || ny >= rows as isize {
+                continue;
+            }
+            let a = (door.from.0, ny as usize);
+            let b = (door.to.0, ny as usize);
+            edges.push(norm_edge(a, b));
+        }
+    } else {
+        let x = door.from.0 as isize;
+        for dx in min_offset..=max_offset {
+            let nx = x + dx;
+            if nx < 0 || nx >= cols as isize {
+                continue;
+            }
+            let a = (nx as usize, door.from.1);
+            let b = (nx as usize, door.to.1);
+            edges.push(norm_edge(a, b));
+        }
+    }
+
+    edges
+}

src/layout.rs

@@ -23,12 +23,14 @@ pub struct Corridor {
     pub start_room_id: usize,
     pub end_room_id: usize,
     pub path: Vec<(usize, usize)>,
+    pub width: usize,
 }
 
 #[derive(Debug, Clone)]
 pub struct Door {
     pub from: (usize, usize),
     pub to: (usize, usize),
+    pub width: usize,
     pub locked: bool,
     pub archway: bool,
 }
@@ -56,6 +58,8 @@ pub fn generate_layout(
     min_room_size: usize,
     max_room_size: usize,
     square_rooms_only: bool,
+    min_corridor_width: usize,
+    max_corridor_width: usize,
     corridor_randomness_percent: usize,
     dead_end_room_percent: usize,
     door_settings: DoorSettings,
@@ -65,12 +69,15 @@ pub fn generate_layout(
         ^ ((target_room_count as u64) << 16)
         ^ (min_room_size as u64)
         ^ ((max_room_size as u64) << 8)
+        ^ ((min_corridor_width as u64) << 24)
+        ^ ((max_corridor_width as u64) << 28)
         ^ ((corridor_randomness_percent as u64) << 56)
         ^ ((dead_end_room_percent as u64) << 40);
     let base_seed = seed::derive_seed(seed, layout_salt);
     let mut room_rng = SimpleRng::new(seed::derive_seed(base_seed, 1));
     let mut graph_rng = SimpleRng::new(seed::derive_seed(base_seed, 2));
     let mut path_rng = SimpleRng::new(seed::derive_seed(base_seed, 3));
+    let mut corridor_rng = SimpleRng::new(seed::derive_seed(base_seed, 4));
 
     let mut rooms = Vec::new();
     let mut corridors = Vec::new();
@@ -155,6 +162,10 @@ pub fn generate_layout(
     }
 
     let randomness = (corridor_randomness_percent.min(100) as f32) / 100.0;
+    let mut min_width = min_corridor_width.max(1);
+    let max_grid_width = cols.max(1).min(rows.max(1));
+    let max_width = max_corridor_width.max(min_width).min(max_grid_width);
+    min_width = min_width.min(max_width);
     let centers: Vec<(usize, usize)> = rooms.iter().map(Room::center_cell).collect();
     let target_dead_end_rooms = ((rooms.len() * dead_end_room_percent.min(50)) + 50) / 100;
     let room_edges =
@@ -187,6 +198,7 @@ pub fn generate_layout(
                 start_room_id,
                 end_room_id,
                 path,
+                width: corridor_rng.range_inclusive(min_width, max_width),
             });
             next_corridor_id = next_corridor_id.wrapping_add(1);
         }
@@ -197,11 +209,17 @@ pub fn generate_layout(
         corridors,
         doors: Vec::new(),
     };
-    apply_doors(&mut layout, seed, door_settings);
+    apply_doors(&mut layout, seed, door_settings, cols, rows);
     layout
 }
 
-pub fn apply_doors(layout: &mut DungeonLayout, seed: u64, settings: DoorSettings) {
+pub fn apply_doors(
+    layout: &mut DungeonLayout,
+    seed: u64,
+    settings: DoorSettings,
+    cols: usize,
+    rows: usize,
+) {
     layout.doors.clear();
 
     let mut rng = SimpleRng::new(seed::derive_seed(seed, 0xD005_5EED_u64));
@@ -209,40 +227,67 @@ pub fn apply_doors(layout: &mut DungeonLayout, seed: u64, settings: DoorSettings
     let room_hall = (settings.room_hallway_percent.min(100) as f32) / 100.0;
     let locked = (settings.locked_percent.min(100) as f32) / 100.0;
 
+    let corridor_cells = corridor_cells(layout, cols, rows);
     let mut seen_edges = HashSet::new();
-    for corridor in &layout.corridors {
-        for pair in corridor.path.windows(2) {
-            if pair[0] == pair[1] {
-                continue;
-            }
-            let edge = normalized_cell_edge(pair[0], pair[1]);
-            if !seen_edges.insert(edge) {
-                continue;
-            }
-
-            let a_in_room = room_index_at_cell(&layout.rooms, edge.0).is_some();
-            let b_in_room = room_index_at_cell(&layout.rooms, edge.1).is_some();
-            let is_room_hallway = a_in_room ^ b_in_room;
-            let is_middle = !a_in_room && !b_in_room;
-
-            if is_room_hallway {
     let door_chance = base * room_hall;
-                let place_door = door_chance > 0.0 && rng.next_f32() <= door_chance;
+    for corridor in &layout.corridors {
+        if corridor.path.len() < 2 {
+            continue;
+        }
 
+        let start_room = &layout.rooms[corridor.start_room_id];
+        let end_room = &layout.rooms[corridor.end_room_id];
+
+        if let Some(edge) = room_exit_edge(&corridor.path, start_room, true) {
+            if seen_edges.insert(edge) {
+                let place_door = door_chance > 0.0 && rng.next_f32() <= door_chance;
                 layout.doors.push(Door {
                     from: edge.0,
                     to: edge.1,
+                    width: corridor.width.max(1),
                     locked: place_door && rng.next_f32() <= locked,
                     archway: !place_door,
                 });
-                continue;
+            }
         }
 
-            if is_middle && settings.allow_middle_corridor_doors {
-                if base > 0.0 && rng.next_f32() <= base {
+        if let Some(edge) = room_exit_edge(&corridor.path, end_room, false) {
+            if seen_edges.insert(edge) {
+                let place_door = door_chance > 0.0 && rng.next_f32() <= door_chance;
                 layout.doors.push(Door {
                     from: edge.0,
                     to: edge.1,
+                    width: corridor.width.max(1),
+                    locked: place_door && rng.next_f32() <= locked,
+                    archway: !place_door,
+                });
+            }
+        }
+    }
+
+    if settings.allow_middle_corridor_doors {
+        for &(x, y) in &corridor_cells {
+            let right = (x + 1, y);
+            let bottom = (x, y + 1);
+            if x + 1 < cols && corridor_cells.contains(&right) {
+                let edge = normalized_cell_edge((x, y), right);
+                if seen_edges.insert(edge) && base > 0.0 && rng.next_f32() <= base {
+                    layout.doors.push(Door {
+                        from: edge.0,
+                        to: edge.1,
+                        width: 1,
+                        locked: rng.next_f32() <= locked,
+                        archway: false,
+                    });
+                }
+            }
+            if y + 1 < rows && corridor_cells.contains(&bottom) {
+                let edge = normalized_cell_edge((x, y), bottom);
+                if seen_edges.insert(edge) && base > 0.0 && rng.next_f32() <= base {
+                    layout.doors.push(Door {
+                        from: edge.0,
+                        to: edge.1,
+                        width: 1,
                         locked: rng.next_f32() <= locked,
                         archway: false,
                     });
@@ -252,6 +297,115 @@ pub fn apply_doors(layout: &mut DungeonLayout, seed: u64, settings: DoorSettings
     }
 }
 
+fn room_exit_edge(
+    path: &[(usize, usize)],
+    room: &Room,
+    from_start: bool,
+) -> Option<((usize, usize), (usize, usize))> {
+    let in_room = |cell: (usize, usize)| {
+        cell.0 >= room.x
+            && cell.0 < room.x + room.width
+            && cell.1 >= room.y
+            && cell.1 < room.y + room.height
+    };
+
+    if from_start {
+        for pair in path.windows(2) {
+            if in_room(pair[0]) && !in_room(pair[1]) {
+                return Some(normalized_cell_edge(pair[0], pair[1]));
+            }
+        }
+    } else {
+        for pair in path.windows(2).rev() {
+            if in_room(pair[1]) && !in_room(pair[0]) {
+                return Some(normalized_cell_edge(pair[0], pair[1]));
+            }
+        }
+    }
+
+    None
+}
+
+pub fn corridor_cells(layout: &DungeonLayout, cols: usize, rows: usize) -> HashSet<(usize, usize)> {
+    let mut cells = HashSet::new();
+    if cols == 0 || rows == 0 {
+        return cells;
+    }
+
+    let mut room_cells = HashSet::new();
+    for room in &layout.rooms {
+        for x in room.x..(room.x + room.width) {
+            for y in room.y..(room.y + room.height) {
+                room_cells.insert((x, y));
+            }
+        }
+    }
+
+    for corridor in &layout.corridors {
+        let width = corridor.width.max(1);
+        let min_offset = -((width as isize - 1) / 2);
+        let max_offset = width as isize / 2;
+        if corridor.path.len() == 1 {
+            let (x, y) = corridor.path[0];
+            for dy in min_offset..=max_offset {
+                let ny = y as isize + dy;
+                if ny < 0 || ny >= rows as isize {
+                    continue;
+                }
+                let cell = (x, ny as usize);
+                if !room_cells.contains(&cell) {
+                    cells.insert(cell);
+                }
+            }
+            continue;
+        }
+
+        for pair in corridor.path.windows(2) {
+            let a = pair[0];
+            let b = pair[1];
+            if a == b {
+                continue;
+            }
+
+            if a.0 != b.0 {
+                let x0 = a.0.min(b.0);
+                let x1 = a.0.max(b.0);
+                let y = a.1 as isize;
+                for x in x0..=x1 {
+                    for dy in min_offset..=max_offset {
+                        let ny = y + dy;
+                        if ny < 0 || ny >= rows as isize {
+                            continue;
+                        }
+                        let cell = (x, ny as usize);
+                        if !room_cells.contains(&cell) {
+                            cells.insert(cell);
+                        }
+                    }
+                }
+            } else {
+                let y0 = a.1.min(b.1);
+                let y1 = a.1.max(b.1);
+                let x = a.0 as isize;
+                for y in y0..=y1 {
+                    for dx in min_offset..=max_offset {
+                        let nx = x + dx;
+                        if nx < 0 || nx >= cols as isize {
+                            continue;
+                        }
+                        let cell = (nx as usize, y);
+                        if !room_cells.contains(&cell) {
+                            cells.insert(cell);
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    cells
+}
+
 fn build_room_connection_edges(
     centers: &[(usize, usize)],
     randomness: f32,
@@ -557,15 +711,6 @@ fn manhattan_distance(a: (usize, usize), b: (usize, usize)) -> usize {
     a.0.abs_diff(b.0) + a.1.abs_diff(b.1)
 }
 
-fn room_index_at_cell(rooms: &[Room], cell: (usize, usize)) -> Option<usize> {
-    rooms.iter().position(|room| {
-        cell.0 >= room.x
-            && cell.0 < room.x + room.width
-            && cell.1 >= room.y
-            && cell.1 < room.y + room.height
-    })
-}
-
 fn normalized_cell_edge(a: (usize, usize), b: (usize, usize)) -> ((usize, usize), (usize, usize)) {
     if a <= b { (a, b) } else { (b, a) }
 }

src/main.rs

@@ -8,7 +8,7 @@ use std::collections::HashSet;
 
 use eframe::egui;
 use egui::{Color32, Stroke};
-use layout::{DoorSettings, DungeonLayout, shortest_path_cells};
+use layout::{DoorSettings, DungeonLayout, corridor_cells, shortest_path_cells};
 use ui::{UiSettings, draw_side_panel};
 
 fn main() -> eframe::Result<()> {
@@ -38,6 +38,8 @@ impl Default for DungeonApp {
             settings.min_room_size,
             settings.max_room_size,
             settings.square_rooms_only,
+            settings.min_corridor_width,
+            settings.max_corridor_width,
             settings.corridor_randomness,
             settings.dead_end_rooms_percent,
             door_settings_from_ui(&settings),
@@ -65,6 +67,12 @@ impl eframe::App for DungeonApp {
         if self.settings.min_room_size > self.settings.max_room_size {
             self.settings.max_room_size = self.settings.min_room_size;
         }
+        if self.settings.min_corridor_width == 0 {
+            self.settings.min_corridor_width = 1;
+        }
+        if self.settings.min_corridor_width > self.settings.max_corridor_width {
+            self.settings.max_corridor_width = self.settings.min_corridor_width;
+        }
 
         if panel_result.reset_clicked || panel_result.settings_changed {
             self.regenerate_layout();
@@ -133,6 +141,8 @@ impl DungeonApp {
             self.settings.min_room_size,
             self.settings.max_room_size,
             self.settings.square_rooms_only,
+            self.settings.min_corridor_width,
+            self.settings.max_corridor_width,
             self.settings.corridor_randomness,
             self.settings.dead_end_rooms_percent,
             door_settings_from_ui(&self.settings),
@@ -306,6 +316,8 @@ impl DungeonApp {
             &mut self.layout,
             self.settings.seed,
             door_settings_from_ui(&self.settings),
+            self.settings.cols,
+            self.settings.rows,
         );
     }
 }
@@ -333,6 +345,8 @@ enum DragState {
 struct GridGeometry {
     rect: egui::Rect,
     cell_size: f32,
+    cols: usize,
+    rows: usize,
 }
 
 fn draw_grid(painter: &egui::Painter, area: egui::Rect, cols: usize, rows: usize) -> GridGeometry {
@@ -379,6 +393,8 @@ fn draw_grid(painter: &egui::Painter, area: egui::Rect, cols: usize, rows: usize
     GridGeometry {
         rect: grid_rect,
         cell_size,
+        cols,
+        rows,
     }
 }
 
@@ -394,21 +410,15 @@ fn draw_layout(
     let room_fill = Color32::from_rgb(70, 120, 160);
     let corridor_fill = Color32::from_rgb(210, 190, 120);
     let wall_color = Color32::BLACK;
-    let mut corridor_cells_set = HashSet::new();
-    let mut corridor_edges_set = HashSet::new();
+    let corridor_cells_set = corridor_cells(layout, geometry.cols, geometry.rows);
+    let corridor_edges_set = corridor_edges_from_cells(&corridor_cells_set);
     let mut room_cells_set = HashSet::new();
+    let room_edges_set = room_edges_from_rooms(&layout.rooms);
     let mut door_edges_set = HashSet::new();
 
     for door in &layout.doors {
-        door_edges_set.insert(normalized_edge(door.from, door.to));
-    }
-
-    for corridor in &layout.corridors {
-        for &cell in &corridor.path {
-            corridor_cells_set.insert(cell);
-        }
-        for pair in corridor.path.windows(2) {
-            corridor_edges_set.insert(normalized_edge(pair[0], pair[1]));
+        for edge in door_edges_for(door, geometry.cols, geometry.rows) {
+            door_edges_set.insert(edge);
         }
     }
 
@@ -510,12 +520,15 @@ fn draw_layout(
         let left = col.checked_sub(1).map(|x| (x, row));
         let top = row.checked_sub(1).map(|y| (col, y));
 
-        if col == 0
+        let left_edge = col == 0
             || (!room_cells_set.contains(&(col - 1, row))
+                || left
+                    .map(|n| !room_edges_set.contains(&normalized_edge((col, row), n)))
+                    .unwrap_or(true))
                 && left
                     .map(|n| !door_edges_set.contains(&normalized_edge((col, row), n)))
-                    .unwrap_or(true))
-        {
+                    .unwrap_or(true);
+        if left_edge {
             draw_wall_segment(
                 painter,
                 egui::pos2(rect.left(), rect.top()),
@@ -524,7 +537,8 @@ fn draw_layout(
                 wall_color,
             );
         }
-        if !room_cells_set.contains(&right)
+        if (!room_cells_set.contains(&right)
+            || !room_edges_set.contains(&normalized_edge((col, row), right)))
             && !door_edges_set.contains(&normalized_edge((col, row), right))
         {
             draw_wall_segment(
@@ -535,12 +549,15 @@ fn draw_layout(
                 wall_color,
             );
         }
-        if row == 0
+        let top_edge = row == 0
             || (!room_cells_set.contains(&(col, row - 1))
+                || top
+                    .map(|n| !room_edges_set.contains(&normalized_edge((col, row), n)))
+                    .unwrap_or(true))
                 && top
                     .map(|n| !door_edges_set.contains(&normalized_edge((col, row), n)))
-                    .unwrap_or(true))
-        {
+                    .unwrap_or(true);
+        if top_edge {
             draw_wall_segment(
                 painter,
                 egui::pos2(rect.left(), rect.top()),
@@ -549,7 +566,8 @@ fn draw_layout(
                 wall_color,
             );
         }
-        if !room_cells_set.contains(&bottom)
+        if (!room_cells_set.contains(&bottom)
+            || !room_edges_set.contains(&normalized_edge((col, row), bottom)))
             && !door_edges_set.contains(&normalized_edge((col, row), bottom))
         {
             draw_wall_segment(
@@ -588,6 +606,7 @@ fn draw_layout(
             geometry,
             door.from,
             door.to,
+            door.width,
             Stroke::new(door_width_px, color),
             style,
         );
@@ -636,6 +655,83 @@ fn normalized_edge(a: (usize, usize), b: (usize, usize)) -> ((usize, usize), (us
     if a <= b { (a, b) } else { (b, a) }
 }
 
+fn corridor_edges_from_cells(
+    corridor_cells: &HashSet<(usize, usize)>,
+) -> HashSet<((usize, usize), (usize, usize))> {
+    let mut edges = HashSet::new();
+    for &(col, row) in corridor_cells {
+        let right = (col + 1, row);
+        let bottom = (col, row + 1);
+        if corridor_cells.contains(&right) {
+            edges.insert(normalized_edge((col, row), right));
+        }
+        if corridor_cells.contains(&bottom) {
+            edges.insert(normalized_edge((col, row), bottom));
+        }
+    }
+    edges
+}
+
+fn room_edges_from_rooms(rooms: &[layout::Room]) -> HashSet<((usize, usize), (usize, usize))> {
+    let mut edges = HashSet::new();
+    for room in rooms {
+        let x_end = room.x + room.width;
+        let y_end = room.y + room.height;
+        for x in room.x..x_end {
+            for y in room.y..y_end {
+                if x + 1 < x_end {
+                    edges.insert(normalized_edge((x, y), (x + 1, y)));
+                }
+                if y + 1 < y_end {
+                    edges.insert(normalized_edge((x, y), (x, y + 1)));
+                }
+            }
+        }
+    }
+    edges
+}
+
+fn door_edges_for(
+    door: &layout::Door,
+    cols: usize,
+    rows: usize,
+) -> Vec<((usize, usize), (usize, usize))> {
+    let mut edges = Vec::new();
+    if door.from.0.abs_diff(door.to.0) + door.from.1.abs_diff(door.to.1) != 1 {
+        return edges;
+    }
+
+    let width = door.width.max(1) as isize;
+    let min_offset = -((width - 1) / 2);
+    let max_offset = width / 2;
+
+    if door.from.0 != door.to.0 {
+        let y = door.from.1 as isize;
+        for dy in min_offset..=max_offset {
+            let ny = y + dy;
+            if ny < 0 || ny >= rows as isize {
+                continue;
+            }
+            let a = (door.from.0, ny as usize);
+            let b = (door.to.0, ny as usize);
+            edges.push(normalized_edge(a, b));
+        }
+    } else {
+        let x = door.from.0 as isize;
+        for dx in min_offset..=max_offset {
+            let nx = x + dx;
+            if nx < 0 || nx >= cols as isize {
+                continue;
+            }
+            let a = (nx as usize, door.from.1);
+            let b = (nx as usize, door.to.1);
+            edges.push(normalized_edge(a, b));
+        }
+    }
+
+    edges
+}
+
 fn pointer_to_grid(pointer_pos: egui::Pos2, geometry: &GridGeometry) -> Option<(f32, f32)> {
     if !geometry.rect.contains(pointer_pos) {
         return None;
@@ -726,6 +822,7 @@ fn draw_door_line(
     geometry: &GridGeometry,
     a: (usize, usize),
     b: (usize, usize),
+    width_cells: usize,
     stroke: Stroke,
     style: DoorLineStyle,
 ) {
@@ -733,17 +830,25 @@ fn draw_door_line(
         return;
     }
 
+    let width_cells = width_cells.max(1);
+    let min_offset = -((width_cells as isize - 1) / 2);
+    let max_offset = width_cells as isize / 2;
+
     if a.0 != b.0 {
         let x = geometry.rect.left() + (a.0.max(b.0) as f32) * geometry.cell_size;
-        let row = a.1;
-        let y0 = geometry.rect.top() + row as f32 * geometry.cell_size;
-        let y1 = y0 + geometry.cell_size;
+        let row = a.1 as isize;
+        let y0_cell = (row + min_offset).clamp(0, geometry.rows.saturating_sub(1) as isize);
+        let y1_cell = (row + max_offset).clamp(0, geometry.rows.saturating_sub(1) as isize);
+        let y0 = geometry.rect.top() + y0_cell as f32 * geometry.cell_size;
+        let y1 = geometry.rect.top() + (y1_cell as f32 + 1.0) * geometry.cell_size;
         draw_styled_line(painter, egui::pos2(x, y0), egui::pos2(x, y1), stroke, style);
     } else {
         let y = geometry.rect.top() + (a.1.max(b.1) as f32) * geometry.cell_size;
-        let col = a.0;
-        let x0 = geometry.rect.left() + col as f32 * geometry.cell_size;
-        let x1 = x0 + geometry.cell_size;
+        let col = a.0 as isize;
+        let x0_cell = (col + min_offset).clamp(0, geometry.cols.saturating_sub(1) as isize);
+        let x1_cell = (col + max_offset).clamp(0, geometry.cols.saturating_sub(1) as isize);
+        let x0 = geometry.rect.left() + x0_cell as f32 * geometry.cell_size;
+        let x1 = geometry.rect.left() + (x1_cell as f32 + 1.0) * geometry.cell_size;
         draw_styled_line(painter, egui::pos2(x0, y), egui::pos2(x1, y), stroke, style);
     }
 }

src/ui.rs

@@ -97,6 +97,8 @@ pub struct UiSettings {
     pub min_room_size: usize,
     pub max_room_size: usize,
     pub square_rooms_only: bool,
+    pub min_corridor_width: usize,
+    pub max_corridor_width: usize,
     pub corridor_randomness: usize,
     pub dead_end_rooms_percent: usize,
     pub door_frequency_percent: usize,
@@ -122,6 +124,8 @@ impl Default for UiSettings {
             min_room_size: 2,
             max_room_size: 6,
             square_rooms_only: false,
+            min_corridor_width: 1,
+            max_corridor_width: 2,
             corridor_randomness: 0,
             dead_end_rooms_percent: 0,
             door_frequency_percent: 30,
@@ -403,6 +407,36 @@ fn draw_layout_tab(ui: &mut egui::Ui, settings: &mut UiSettings, result: &mut Si
             .changed();
     });
 
+    ui.add_space(8.0);
+    ui.label("Min Corridor Width");
+    ui.horizontal(|ui| {
+        result.settings_changed |= ui
+            .add(egui::Slider::new(&mut settings.min_corridor_width, 1..=10).show_value(false))
+            .changed();
+        result.settings_changed |= ui
+            .add(
+                egui::DragValue::new(&mut settings.min_corridor_width)
+                    .speed(1.0)
+                    .range(1..=50),
+            )
+            .changed();
+    });
+
+    ui.add_space(8.0);
+    ui.label("Max Corridor Width");
+    ui.horizontal(|ui| {
+        result.settings_changed |= ui
+            .add(egui::Slider::new(&mut settings.max_corridor_width, 1..=10).show_value(false))
+            .changed();
+        result.settings_changed |= ui
+            .add(
+                egui::DragValue::new(&mut settings.max_corridor_width)
+                    .speed(1.0)
+                    .range(1..=50),
+            )
+            .changed();
+    });
+
     ui.add_space(8.0);
     ui.label("Dead-End Rooms (%)");
     ui.horizontal(|ui| {