tiles now have lake or ocean method

src/core/Util.ts

@@ -1,4 +1,4 @@
-import {Cell} from "./Game";
+import {Cell, Tile} from "./Game";
 
 export function manhattanDist(c1: Cell, c2: Cell): number {
     return Math.abs(c1.x - c2.x) + Math.abs(c1.y - c2.y);
@@ -6,4 +6,20 @@ export function manhattanDist(c1: Cell, c2: Cell): number {
 
 export function within(value: number, min: number, max: number): number {
     return Math.min(Math.max(value, min), max);
+}
+
+export function bfs(tile: Tile, dist: number): Set<Tile> {
+    const seen = new Set<Tile>
+    const q: Tile[] = []
+    q.push(tile)
+    while (q.length > 0) {
+        const curr = q.pop()
+        seen.add(curr)
+        for (const n of curr.neighbors()) {
+            if (!seen.has(n) && manhattanDist(tile.cell(), n.cell()) <= dist) {
+                q.push(n)
+            }
+        }
+    }
+    return seen
 }