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@@ -270,14 +270,15 @@ class Board { |
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* Predicate to check if a wall creates a closed room. |
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* |
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* This algorithm has a complexity of O(N^2) where N represents the total |
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* number of tiles it should be used with care. |
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* number of tiles. |
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* It should be used with care. |
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* |
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* @param tileId The tileId of the wall where the wall is. |
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* @param direction The wall's relative direction from the tile. |
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* @return True if the wall creates a closed room, false otherwise. |
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*/ |
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private boolean createsClosedRoom (int tileId, int direction) { |
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// Get a snapshot of the current walls |
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private boolean makesClosedRoom (int tileId, int direction) { |
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// Get a snapshot list of all the walls (all the walls on the board) |
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ArrayList<Edge> w = new ArrayList<Edge>(); |
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for (Edge it : walls) |
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w.add(new Edge(it)); |
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@@ -286,13 +287,13 @@ class Board { |
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Graph g = new Graph(new Edge(tileId, direction)); |
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int size; |
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do { |
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size = w.size(); |
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size = w.size(); // mark the size (before the pass) |
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for (int i =0, S=w.size() ; i<S ; ++i) |
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if (g.attach(w.get(i))) { |
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w.remove(i); |
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--i; --S; |
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if (g.attach(w.get(i))) { // Can we attach the edge(wall) to the graph ? |
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w.remove(i); // If yes remove it from the wall list |
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--i; --S; // decrease iterator and size to match ArrayList's new values |
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} |
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} while (size != w.size()); |
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} while (size != w.size()); // If the size hasn't change(no new graph leafs) exit |
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// Search if a vertex is attached more than once. |
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// This means that there is at least 2 links to the same node |
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@@ -342,7 +343,7 @@ class Board { |
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if (tiles[rightTileId.apply(tileId)].hasWalls() >= Const.maxTileWalls) return false; |
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break; |
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} |
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if (Session.loopGuard && createsClosedRoom(tileId, direction)) |
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if (Session.loopGuard && makesClosedRoom(tileId, direction)) |
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return false; |
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return true; |
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} |
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