2 files changed, 46 insertions, 4 deletions
diff --git a/core/src/ch/asynk/tankontank/engine/Board.java b/core/src/ch/asynk/tankontank/engine/Board.java
index 8884b0f..62e03f2 100644
--- a/core/src/ch/asynk/tankontank/engine/Board.java
+++ b/core/src/ch/asynk/tankontank/engine/Board.java
@@ -346,16 +346,16 @@ public abstract class Board implements Disposable
         nodesToPoints(nodes, targets);
     }
 
-    public void possiblePaths(Pawn pawn, int col0, int row0, int col1, int row1, Set<GridPoint2> points)
+    public int nodesToSet(List<Vector<SearchBoard.Node>> nodes, Set<GridPoint2> points)
     {
         // FIXME : optimize this
         for (GridPoint2 point : points)
             gridPoint2Pool.free(point);
         points.clear();
 
-        List<Vector<SearchBoard.Node>> paths = searchBoard.possiblePaths(pawn, col0, row0, col1, row1);
-        for (Vector<SearchBoard.Node> path : paths) {
+        for (Vector<SearchBoard.Node> path : nodes) {
             for (int i = 0, n = path.size(); i < n; i++) {
+                // FIXME : optimize this
                 GridPoint2 point = gridPoint2Pool.obtain();
                 SearchBoard.Node node = path.get(i);
                 point.set(node.col, node.row);
@@ -363,6 +363,20 @@ public abstract class Board implements Disposable
                     gridPoint2Pool.free(point);
             }
         }
+
+        return nodes.size();
+    }
+
+    public int possiblePaths(Pawn pawn, int col0, int row0, int col1, int row1, Set<GridPoint2> points)
+    {
+        List<Vector<SearchBoard.Node>> paths = searchBoard.possiblePaths(pawn, col0, row0, col1, row1);
+        return nodesToSet(paths, points);
+    }
+
+    public int possiblePathsFilterAdd(int col, int row, Set<GridPoint2> points)
+    {
+        List<Vector<SearchBoard.Node>> paths = searchBoard.possiblePathsFilterAdd(col, row);
+        return nodesToSet(paths, points);
     }
 
     public void disableOverlaysOn(int col, int row)
diff --git a/core/src/ch/asynk/tankontank/engine/SearchBoard.java b/core/src/ch/asynk/tankontank/engine/SearchBoard.java
index 7e03153..9a11835 100644
--- a/core/src/ch/asynk/tankontank/engine/SearchBoard.java
+++ b/core/src/ch/asynk/tankontank/engine/SearchBoard.java
@@ -36,6 +36,7 @@ public class SearchBoard
 
     private ArrayDeque<Node> path = new ArrayDeque<Node>(20);
     private List<Vector<Node>> possiblePaths = new LinkedList<Vector<Node>>();
+    private List<Node> possiblePathsFilters = new Vector<Node>(5);
 
     private List<Node> moves;
     private List<Node> targets;
@@ -487,10 +488,37 @@ public class SearchBoard
         return los;
     }
 
-    public List<Vector<Node>> possiblePaths(Pawn pawn, int col0, int row0, int col1, int row1)
+    public void clearPossiblePaths()
     {
         path.clear();
+        for (Vector<Node> v : possiblePaths)
+            v.clear();
         possiblePaths.clear();
+        possiblePathsFilters.clear();
+    }
+
+    public List<Vector<Node>> possiblePathsFilterAdd(int col, int row)
+    {
+        possiblePathsFilters.add(getNode(col, row));
+        int n = possiblePathsFilters.size();
+
+        List<Vector<Node>> paths = new LinkedList<Vector<Node>>();
+        for (Vector<Node> path : possiblePaths) {
+            int ok = 0;
+            for (Node filter : possiblePathsFilters) {
+                if (path.contains(filter))
+                    ok += 1;
+            }
+            if (ok == n)
+                paths.add(path);
+        }
+
+        return paths;
+    }
+
+    public List<Vector<Node>> possiblePaths(Pawn pawn, int col0, int row0, int col1, int row1)
+    {
+        clearPossiblePaths();
 
         Node from = getNode(col0, row0);
         Node to = getNode(col1, row1);