update for new RLTK version

src/map.rs

@@ -96,12 +96,54 @@ impl Map {
 
         map
     }
+
+    fn is_exit_valid(&self, x: i32, y: i32) -> bool {
+        if x < 1 || x > self.width - 1 || y < 1 || y > self.height - 1 {
+            return false;
+        }
+        let idx = self.xy_idx(x, y);
+        self.tiles[idx as usize] != TileType::Wall
+    }
 }
 
 impl BaseMap for Map {
     fn is_opaque(&self, idx: usize) -> bool {
         self.tiles[idx as usize] == TileType::Wall
     }
+    
+    fn get_available_exits(&self, idx: usize) -> rltk::SmallVec<[(usize, f32); 10]> {
+        let mut exits = rltk::SmallVec::new();
+        let x = idx as i32 % self.width;
+        let y = idx as i32 / self.width;
+        let w = self.width as usize;
+        // Cardinal directions
+        if self.is_exit_valid(x - 1, y) {
+            exits.push((idx - 1, 1.0))
+        };
+        if self.is_exit_valid(x + 1, y) {
+            exits.push((idx + 1, 1.0))
+        };
+        if self.is_exit_valid(x, y - 1) {
+            exits.push((idx - w, 1.0))
+        };
+        if self.is_exit_valid(x, y + 1) {
+            exits.push((idx + w, 1.0))
+        };
+        // Diagonals
+        if self.is_exit_valid(x - 1, y - 1) {
+            exits.push(((idx - w) - 1, 1.45));
+        }
+        if self.is_exit_valid(x + 1, y - 1) {
+            exits.push(((idx - w) + 1, 1.45));
+        }
+        if self.is_exit_valid(x - 1, y + 1) {
+            exits.push(((idx + w) - 1, 1.45));
+        }
+        if self.is_exit_valid(x + 1, y + 1) {
+            exits.push(((idx + w) + 1, 1.45));
+        }
+        exits
+    }
 }
 
 impl Algorithm2D for Map {