protected bool Wave(ESubject subject)
        {
            int countRow = WorldModel.countRow;
            int countColumn = WorldModel.countColumn;
            int[,] grid = new int[countRow, countColumn];
            Queue<Indices> queue = new Queue<Indices>();
            queue.Enqueue(new Indices(model.Y, model.X));
            bool found = false;
            int step = 1;
            Indices end = new Indices();
            while (queue.Count > 0 && !found)
            {
                Indices i = queue.Dequeue();
                grid[i.I, i.J] = step;
                for (int j = 0; j < 4; j++)
                {
                    i.I += dy[j];
                    i.J += dx[j];
                    if (i.I < 0 || i.I >= countRow || i.J < 0 || i.J >= countColumn || grid[i.I,i.J] > 0)
                        continue;
                    if (WorldModel.world[i.I, i.J].IsPassable)
                    {
                        queue.Enqueue(i);
                        grid[i.I, i.J] = step + 1;
                    }
                    else
                    {
                        found = WorldModel.world[i.I, i.J].GetTile == subject;
                        if (found)
                        {
                            end.I = i.I;
                            end.J = i.J;
                            grid[i.I, i.J] = step + 1;
                            break;
                        }
                    }
                }
                step++;
            }
            return found;
        }