correct room positions. no coridors yet.

src/common/random.rs

@@ -3,9 +3,9 @@
 use rand::prelude::*;
 
 
-/// Generate random number between start and end inclusive on both ends
+/// Generate random number between start (inclusive) and end (exclusive).
 pub fn random_range(rng: &mut StdRng, start: usize, end: usize) -> usize {
-    let max = (end - start + 1) as u32;
+    let max = (end - start) as u32;
     ((rng.next_u32() % max) + start as u32) as usize
 }
 
@@ -23,7 +23,7 @@ mod tests {
         let system_time = SystemTime::now().duration_since(UNIX_EPOCH).expect("Can't access system time");
         let mut rng = StdRng::seed_from_u64(system_time.as_millis() as u64);
         let x = random_range(&mut rng, 5, 8);
-        assert!(x >= 5 && x <= 8);
+        assert!(x >= 5 && x < 8);
     }
 
 }

src/dungeon/random_rooms.rs

@@ -56,8 +56,8 @@ impl RandomRoomsGen {
         for _ in 0..self.max_rooms {
             let w = random::random_range(rng, self.min_room_size, self.max_room_size);
             let h = random::random_range(rng, self.min_room_size, self.max_room_size);
-            let x = random::random_range(rng, 0, width - w);
+            let x = random::random_range(rng, 1, width - w);
-            let y = random::random_range(rng, 0, height - h);
+            let y = random::random_range(rng, 1, height - h);
             let new_room = Rect::new(x as i32, y as i32, w as i32, h as i32);
             let intersects = rooms.iter().any(|r| new_room.intersect(r));
             if !intersects {