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Author: Dinesh-Kumar-E

Maze-Solver/BFS.py

@@ -0,0 +1,333 @@
+import Path_Backtrack
+
+import copy
+
+import Draw
+import timeit
+import time
+
+
+class Queue:
+
+    def __init__(self):
+
+        self.Queue = []
+
+
+    def Add_element(self, data):
+
+        #print("data : ",data)
+
+
+        if data is None:
+            return
+
+
+        flag = any(isinstance(i, list) for i in data)
+
+
+        if not flag:
+
+            self.Queue.append(data)
+             
+        else:
+            for i in data:
+
+                self.Queue.append(i)
+                
+
+    def remove(self):
+
+        if len(self.Queue) != 0:
+
+            last_element = self.Queue[0]
+
+            self.Queue = self.Queue[1:]
+
+            return last_element
+
+        else:
+
+            return 0
+
+
+    def display(self):
+
+        return self.Queue
+
+
+    def is_empty(self):
+
+        return True if len(self.Queue) == 0 else False
+
+
+
+def read_file(FileLoc):
+
+    Map = []
+
+
+    with open(FileLoc) as file:
+
+        lines = file.readlines()
+
+        for line in lines:
+
+            temp = []
+
+            temp.extend(line)
+
+
+            if "\n" in temp:
+
+                temp.remove("\n")
+
+
+            Map.append(temp)
+
+
+        file.close()
+
+
+    #print("File loaded successfully")
+
+
+    return Map
+
+
+
+def Map_Dimension(map):
+
+    row, column = 0, 0
+
+    row, column = len(map), len(map[0])
+
+
+    return row, column
+
+
+
+def Location(map, element):
+
+    row, column = Map_Dimension(map)
+
+    #print(row,column)
+
+    walls = []
+
+
+    if element == "Walls":
+
+        wall_element = "+"
+
+        #print(row,column)
+
+        for x in range(row):
+
+            for y in range(column):
+
+                #print(x,y)
+
+                if map[x][y] == wall_element:
+
+                    walls.append([x, y])
+
+
+        return walls
+
+    else:
+
+        for x in range(row):
+
+            for y in range(column):
+
+                if map[x][y] == element:
+
+                    return [x, y]
+
+
+
+def Available_move(map, pos, walls, explored):
+
+    row, column = Map_Dimension(map)
+
+    #print("pos : ", pos)
+
+    up = [pos[0] - 1, pos[1]]
+
+    down = [pos[0] + 1, pos[1]]
+
+    left = [pos[0], pos[1] - 1]
+
+    right = [pos[0], pos[1] + 1]
+
+
+    moves = [up, down, left, right]
+
+
+    result = copy.deepcopy(moves)
+
+
+    for x in range(4):
+
+        i = moves[x]
+
+        # print(i)
+
+        if (i[0]) < 0:
+            if i in result:
+
+                result.remove(i)
+
+        if (i[1]) < 0:
+            if i in result:
+
+                result.remove(i)
+
+        if i[0] >= row:
+            if i in result:
+
+                result.remove(i)
+
+        if i[1] >= column:
+            if i in result:
+
+                result.remove(i)
+
+
+    moves = copy.deepcopy(result)
+
+
+    for i in moves:
+
+        if i in walls:
+
+            result.remove(i)
+
+
+    moves = copy.deepcopy(result)
+
+
+    for i in moves:
+
+        if i in explored:
+
+            result.remove(i)
+
+
+    #print("available move : ", result)
+
+
+    if len(result) != 0:
+        return result
+    else:
+
+        return None
+
+
+def BFS_Algorithm(grid, start_point, end_point):
+
+    t0 = timeit.default_timer()
+
+    frontier = Queue()
+
+    path = Path_Backtrack.Path_Finder()
+
+    explored = []
+
+    destination = Location(grid, end_point)
+
+    walls = Location(grid, "Walls")
+
+    #print("Walls -->", walls)
+
+    initial_position = Location(grid, start_point)
+
+    frontier.Add_element(initial_position)
+
+    while not frontier.is_empty():
+
+        #print("Frontier->", frontier.display())
+
+        previous = frontier.remove()
+
+        #print(previous, "--> Pop Element")  # printing pop element
+
+        #print("Frontier->", frontier.display())
+
+
+        if previous == destination:
+
+            #path.Print()
+
+            res = path.Trace(initial_position, destination)
+
+            t1 = timeit.default_timer()
+            print(res)
+
+            elapsed_time = round((t1 - t0) * 10 ** 6, 3)
+
+            l = len(res)  # type: ignore
+
+            property = {"method":"BFS",
+
+                        "speed":str(elapsed_time)+str(" nano seconds"),
+
+                        "cost":str(len(explored)),
+
+                        "moves":str(l)}
+
+            graph = Draw.Create_Graph(res,walls,Map_Dimension(grid),property,explored)
+
+            graph.graph()
+
+            return
+        else:
+
+            #time.sleep(1)
+
+            explored.append(previous)
+
+            moves = Available_move(grid, previous, walls, explored)
+
+
+            #if moves is not None:
+
+            #    frontier.Add_element(moves)
+
+
+            path.Add_element(previous, moves)
+
+
+            if not moves:
+
+                continue
+            else:
+
+                frontier.Add_element(moves)
+
+    else:
+
+        print("No Solutions Found !")
+
+
+    #path.Trace(start_point, end_point)
+
+
+
+def runner(Loc,Start,Destination):
+
+    #print("working 1")
+
+    #location = Loc
+
+    #location = File_Opener.get_path()
+
+    Map = read_file(Loc)
+    
+    BFS_Algorithm(Map, Start, Destination)
+    
+    
+#runner()
+
+