v0.3.0c: added the ability to get all cells from a room

src/com/shatteredpixel/shatteredpixeldungeon/levels/Room.java

@@ -137,6 +137,14 @@ public class Room extends Rect implements Graph.Node, Bundlable {
 			(top + bottom) / 2 + (((bottom - top) & 1) == 1 ? Random.Int( 2 ) : 0) );
 	}
 
+	public HashSet<Integer> getCells(){
+		HashSet<Point> points = getPoints();
+		HashSet<Integer> cells = new HashSet<>();
+		for( Point point : points)
+			cells.add(point.x + point.y*Level.WIDTH);
+		return cells;
+	}
+	
 	// **** Graph.Node interface ****
 
 	@Override