532 lines
15 KiB
Python
532 lines
15 KiB
Python
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import sys
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from collections import deque
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import heapq
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import time
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import os
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from abc import ABC, abstractmethod
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from typing import List, Optional, Dict, Any
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DATA_PATH = r"C:\Users\User\2026-rff_mp\ShulpinIN\maze_lab2\docs\data"
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class Observer(ABC):
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@abstractmethod
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def update(self, event: str, data: Any = None):
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pass
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class Observable:
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def __init__(self):
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self._observers: List[Observer] = []
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def attach(self, observer: Observer):
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self._observers.append(observer)
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def detach(self, observer: Observer):
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self._observers.remove(observer)
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def notify(self, event: str, data: Any = None):
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for observer in self._observers:
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observer.update(event, data)
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class Tile:
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def __init__(self, x: int, y: int):
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self._x = x
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self._y = y
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self._wall = False
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self._start = False
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self._exit = False
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@property
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def x(self) -> int:
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return self._x
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@property
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def y(self) -> int:
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return self._y
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@property
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def is_wall(self) -> bool:
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return self._wall
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@is_wall.setter
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def is_wall(self, v: bool):
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self._wall = v
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@property
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def is_start(self) -> bool:
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return self._start
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@is_start.setter
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def is_start(self, v: bool):
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self._start = v
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@property
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def is_exit(self) -> bool:
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return self._exit
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@is_exit.setter
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def is_exit(self, v: bool):
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self._exit = v
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def passable(self) -> bool:
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return not self._wall
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def __hash__(self):
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return hash((self._x, self._y))
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def __eq__(self, other):
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if not isinstance(other, Tile):
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return False
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return self._x == other._x and self._y == other._y
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class Maze:
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def __init__(self, w: int, h: int):
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self._w = w
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self._h = h
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self._cells = [[Tile(x, y) for x in range(w)] for y in range(h)]
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self._start: Optional[Tile] = None
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self._exit: Optional[Tile] = None
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@property
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def width(self) -> int:
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return self._w
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@property
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def height(self) -> int:
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return self._h
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@property
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def start(self) -> Optional[Tile]:
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return self._start
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@property
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def exit(self) -> Optional[Tile]:
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return self._exit
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def get_cell(self, x: int, y: int) -> Optional[Tile]:
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if 0 <= x < self._w and 0 <= y < self._h:
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return self._cells[y][x]
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return None
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def set_cell(self, x: int, y: int, kind: str):
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c = self.get_cell(x, y)
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if not c:
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return
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if kind == 'wall':
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c.is_wall = True
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elif kind == 'start':
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if self._start:
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self._start.is_start = False
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c.is_start = True
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c.is_wall = False
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self._start = c
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elif kind == 'exit':
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if self._exit:
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self._exit.is_exit = False
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c.is_exit = True
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c.is_wall = False
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self._exit = c
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elif kind == 'path':
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c.is_wall = False
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def neighbours(self, cell: Tile) -> List[Tile]:
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result = []
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for dx, dy in [(0, -1), (0, 1), (-1, 0), (1, 0)]:
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nx, ny = cell.x + dx, cell.y + dy
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nb = self.get_cell(nx, ny)
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if nb and nb.passable():
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result.append(nb)
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return result
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class MazeLoader(ABC):
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@abstractmethod
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def load(self, filename: str) -> Maze:
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pass
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class TextMazeLoader(MazeLoader):
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def load(self, filename: str) -> Maze:
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with open(filename, 'r', encoding='utf-8') as f:
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lines = [line.rstrip('\n') for line in f.readlines()]
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h = len(lines)
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w = max(len(line) for line in lines) if h else 0
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start_count = 0
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exit_count = 0
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maze = Maze(w, h)
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for y, line in enumerate(lines):
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for x, ch in enumerate(line):
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if ch == '#':
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maze.set_cell(x, y, 'wall')
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elif ch == 'S':
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maze.set_cell(x, y, 'start')
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start_count += 1
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elif ch == 'E':
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maze.set_cell(x, y, 'exit')
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exit_count += 1
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else:
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maze.set_cell(x, y, 'path')
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if start_count != 1 or exit_count != 1:
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raise ValueError(f"Maze must have one S and one E. Found: S={start_count}, E={exit_count}")
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return maze
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class PathFinder(ABC):
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def __init__(self):
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self._visited = 0
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@abstractmethod
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def find(self, maze: Maze, start: Tile, goal: Tile) -> List[Tile]:
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pass
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def _reconstruct(self, parent: Dict[Tile, Optional[Tile]], start: Tile, goal: Tile) -> List[Tile]:
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path = []
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current = goal
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while current is not None:
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path.append(current)
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current = parent.get(current)
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path.reverse()
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return path if path and path[0] == start else []
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@property
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def visited_count(self) -> int:
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return self._visited
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class BFS(PathFinder):
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def find(self, maze: Maze, start: Tile, goal: Tile) -> List[Tile]:
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queue = deque([start])
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parent = {start: None}
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visited = {start}
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while queue:
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current = queue.popleft()
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if current == goal:
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self._visited = len(visited)
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return self._reconstruct(parent, start, goal)
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for neighbor in maze.neighbours(current):
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if neighbor not in visited:
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visited.add(neighbor)
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parent[neighbor] = current
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queue.append(neighbor)
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self._visited = len(visited)
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return []
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class DFS(PathFinder):
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def find(self, maze: Maze, start: Tile, goal: Tile) -> List[Tile]:
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stack = [start]
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parent = {start: None}
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visited = {start}
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while stack:
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current = stack.pop()
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if current == goal:
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self._visited = len(visited)
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return self._reconstruct(parent, start, goal)
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for neighbor in maze.neighbours(current):
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if neighbor not in visited:
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visited.add(neighbor)
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parent[neighbor] = current
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stack.append(neighbor)
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self._visited = len(visited)
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return []
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class AStar(PathFinder):
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def _heuristic(self, cell: Tile, goal: Tile) -> int:
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return abs(cell.x - goal.x) + abs(cell.y - goal.y)
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def find(self, maze: Maze, start: Tile, goal: Tile) -> List[Tile]:
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heap = []
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counter = 0
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start_f = self._heuristic(start, goal)
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heapq.heappush(heap, (start_f, counter, start))
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counter += 1
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parent = {}
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g_score = {start: 0}
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f_score = {start: start_f}
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visited = set()
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while heap:
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current_f, _, current = heapq.heappop(heap)
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visited.add(current)
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if current == goal:
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self._visited = len(visited)
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return self._reconstruct(parent, start, goal)
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if current_f > f_score.get(current, float('inf')):
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continue
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for neighbor in maze.neighbours(current):
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tentative_g = g_score[current] + 1
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if tentative_g < g_score.get(neighbor, float('inf')):
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parent[neighbor] = current
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g_score[neighbor] = tentative_g
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new_f = tentative_g + self._heuristic(neighbor, goal)
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f_score[neighbor] = new_f
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heapq.heappush(heap, (new_f, counter, neighbor))
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counter += 1
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self._visited = len(visited)
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return []
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class MazeSolver(Observable):
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def __init__(self, maze: Maze):
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super().__init__()
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self._maze = maze
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self._algorithm: Optional[PathFinder] = None
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def set_algorithm(self, algorithm: PathFinder):
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self._algorithm = algorithm
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def solve(self) -> Optional[Dict[str, Any]]:
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if not self._algorithm:
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raise ValueError("Algorithm not set")
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start_time = time.perf_counter()
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path = self._algorithm.find(self._maze, self._maze.start, self._maze.exit)
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end_time = time.perf_counter()
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elapsed_ms = (end_time - start_time) * 1000
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return {
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'time_ms': elapsed_ms,
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'visited': self._algorithm.visited_count,
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'path_length': len(path),
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'path': path
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}
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class Command(ABC):
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@abstractmethod
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def execute(self) -> bool:
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pass
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@abstractmethod
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def undo(self) -> bool:
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pass
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class MoveCommand(Command):
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def __init__(self, player: 'Player', dx: int, dy: int, maze: Maze):
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self._player = player
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self._dx = dx
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self._dy = dy
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self._maze = maze
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self._executed = False
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def execute(self) -> bool:
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new_x = self._player.position.x + self._dx
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new_y = self._player.position.y + self._dy
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target = self._maze.get_cell(new_x, new_y)
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if target and target.passable():
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self._player.move_to(target)
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self._executed = True
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return True
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return False
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def undo(self) -> bool:
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if self._executed:
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self._player.undo()
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self._executed = False
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return True
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return False
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class Player:
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def __init__(self, start_tile: Tile):
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self._position = start_tile
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self._previous = None
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@property
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def position(self) -> Tile:
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return self._position
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def move_to(self, tile: Tile):
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self._previous = self._position
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self._position = tile
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def undo(self):
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if self._previous:
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self._position, self._previous = self._previous, None
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class ConsoleView(Observer):
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def __init__(self, maze: Maze, player: Optional[Player] = None):
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self._maze = maze
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self._player = player
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self._current_path: List[Tile] = []
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def update(self, event: str, data: Any = None):
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if event == "solving_finished":
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self._current_path = data.get('path', [])
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self._display_solution(data)
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def _display_solution(self, stats: Dict):
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os.system('cls' if os.name == 'nt' else 'clear')
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print("=" * (self._maze.width * 2 + 4))
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print("MAZE SOLUTION")
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print("=" * (self._maze.width * 2 + 4))
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for y in range(self._maze.height):
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print(" ", end='')
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for x in range(self._maze.width):
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cell = self._maze.get_cell(x, y)
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if cell == self._maze.start:
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print('S', end=' ')
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elif cell == self._maze.exit:
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print('E', end=' ')
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elif cell.is_wall:
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print('#', end=' ')
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elif self._current_path and cell in self._current_path:
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print('●', end=' ')
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else:
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print('.', end=' ')
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print()
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|
|
print("=" * (self._maze.width * 2 + 4))
|
||
|
|
print(f"Time: {stats['time_ms']:.3f} ms")
|
||
|
|
print(f"Visited: {stats['visited']}")
|
||
|
|
print(f"Path length: {stats['path_length']}")
|
||
|
|
|
||
|
|
def display_maze(self):
|
||
|
|
os.system('cls' if os.name == 'nt' else 'clear')
|
||
|
|
print("=" * (self._maze.width * 2 + 4))
|
||
|
|
print("MAZE")
|
||
|
|
print("=" * (self._maze.width * 2 + 4))
|
||
|
|
|
||
|
|
for y in range(self._maze.height):
|
||
|
|
print(" ", end='')
|
||
|
|
for x in range(self._maze.width):
|
||
|
|
cell = self._maze.get_cell(x, y)
|
||
|
|
if self._player and cell == self._player.position:
|
||
|
|
print('P', end=' ')
|
||
|
|
elif cell == self._maze.start:
|
||
|
|
print('S', end=' ')
|
||
|
|
elif cell == self._maze.exit:
|
||
|
|
print('E', end=' ')
|
||
|
|
elif cell.is_wall:
|
||
|
|
print('#', end=' ')
|
||
|
|
else:
|
||
|
|
print('.', end=' ')
|
||
|
|
print()
|
||
|
|
|
||
|
|
print("=" * (self._maze.width * 2 + 4))
|
||
|
|
print("S - start E - exit # - wall . - path P - player")
|
||
|
|
|
||
|
|
|
||
|
|
def interactive_mode(maze: Maze):
|
||
|
|
player = Player(maze.start)
|
||
|
|
view = ConsoleView(maze, player)
|
||
|
|
view.display_maze()
|
||
|
|
|
||
|
|
solver = MazeSolver(maze)
|
||
|
|
solver.attach(view)
|
||
|
|
|
||
|
|
commands_history: List[Command] = []
|
||
|
|
|
||
|
|
print("\nControls:")
|
||
|
|
print("H (←) J (↓) K (↑) L (→) - move")
|
||
|
|
print("U - undo")
|
||
|
|
print("B - BFS")
|
||
|
|
print("D - DFS")
|
||
|
|
print("A - A*")
|
||
|
|
print("Q - quit")
|
||
|
|
print("\n" + "=" * 50)
|
||
|
|
|
||
|
|
while True:
|
||
|
|
cmd = input("\n> ").lower().strip()
|
||
|
|
|
||
|
|
if cmd == 'q':
|
||
|
|
break
|
||
|
|
|
||
|
|
elif cmd == 'b':
|
||
|
|
solver.set_algorithm(BFS())
|
||
|
|
result = solver.solve()
|
||
|
|
if result:
|
||
|
|
print(f"BFS: {result['time_ms']:.3f} ms, visited={result['visited']}, length={result['path_length']}")
|
||
|
|
|
||
|
|
elif cmd == 'd':
|
||
|
|
solver.set_algorithm(DFS())
|
||
|
|
result = solver.solve()
|
||
|
|
if result:
|
||
|
|
print(f"DFS: {result['time_ms']:.3f} ms, visited={result['visited']}, length={result['path_length']}")
|
||
|
|
|
||
|
|
elif cmd == 'a':
|
||
|
|
solver.set_algorithm(AStar())
|
||
|
|
result = solver.solve()
|
||
|
|
if result:
|
||
|
|
print(f"A*: {result['time_ms']:.3f} ms, visited={result['visited']}, length={result['path_length']}")
|
||
|
|
|
||
|
|
elif cmd in ['h', 'j', 'k', 'l']:
|
||
|
|
dir_map = {'h': (-1, 0), 'l': (1, 0), 'k': (0, -1), 'j': (0, 1)}
|
||
|
|
dx, dy = dir_map[cmd]
|
||
|
|
move = MoveCommand(player, dx, dy, maze)
|
||
|
|
|
||
|
|
if move.execute():
|
||
|
|
commands_history.append(move)
|
||
|
|
view.display_maze()
|
||
|
|
|
||
|
|
if player.position == maze.exit:
|
||
|
|
print("\n*** YOU ESCAPED! ***")
|
||
|
|
print(f"Total moves: {len(commands_history)}")
|
||
|
|
break
|
||
|
|
else:
|
||
|
|
print("Blocked!")
|
||
|
|
|
||
|
|
elif cmd == 'u':
|
||
|
|
if commands_history:
|
||
|
|
last_command = commands_history.pop()
|
||
|
|
last_command.undo()
|
||
|
|
view.display_maze()
|
||
|
|
print("Undo successful")
|
||
|
|
else:
|
||
|
|
print("Nothing to undo")
|
||
|
|
|
||
|
|
else:
|
||
|
|
print("Unknown command")
|
||
|
|
|
||
|
|
|
||
|
|
def main():
|
||
|
|
if len(sys.argv) > 1 and sys.argv[1] == 'experiment':
|
||
|
|
import subprocess
|
||
|
|
subprocess.run([sys.executable, 'plots.py'])
|
||
|
|
return
|
||
|
|
|
||
|
|
loader = TextMazeLoader()
|
||
|
|
|
||
|
|
|
||
|
|
maze_file = os.path.join(DATA_PATH, "maze1.txt")
|
||
|
|
|
||
|
|
if not os.path.exists(maze_file):
|
||
|
|
print(f"ERROR: Maze file not found: {maze_file}")
|
||
|
|
print(f"Please create maze1.txt in: {DATA_PATH}")
|
||
|
|
return
|
||
|
|
|
||
|
|
maze = loader.load(maze_file)
|
||
|
|
interactive_mode(maze)
|
||
|
|
|
||
|
|
|
||
|
|
if __name__ == "__main__":
|
||
|
|
main()
|