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from typing import List
import pygame
import math
from Direction import DIRECTION
import map as Map
import random
class Ghost():
def __init__(self):
self.x = 75
self.y = 75
self.tx = 0
self.ty = 0
self.speed = 3
def heuristic(self, pacman_pos, next_pos):
return abs(next_pos[0] - pacman_pos[0]) + abs(next_pos[1] - pacman_pos[1])
# checks if the current position of pacman is either a dot, big dot or free
def is_valid(self, maze, x, y):
is_dot = maze[y][x] == Map.D
is_big_dot = maze[y][x] == Map.BD
is_free = maze[y][x] == 0
return (is_dot or is_free or is_big_dot)
# checks collision with pacman and obstacles returns false if there is a collision and true otherwise
def check_collision(self, nx, ny, gx, gy, maze):
direct_x = [1, 0, -1, 0, 1, 1, -1, -1]
direct_y = [0, 1, 0, -1, -1, 1, -1, 1]
# print(f"nx: {nx}, ny: {ny}")
# print()
# print(maze[3][13], self.is_valid(maze, 13, 3))
print()
if nx == 391 and ny == 79:
print("----------------------")
for i in range(len(direct_x)):
px = nx + direct_x[i] * 14
py = ny + direct_y[i] * 14
print(px, py)
x = px // gx
y = py // gy
# print(f"x: {x}, y: {y} is_valid({x}, {y}) = {self.is_valid(maze, x, y)}")
if not self.is_valid(maze, x, y):
return False
return True
def get_possible_moves(self, maze):
possible_directions = {}
up = (0, -self.speed)
down = (0, self.speed)
right = (self.speed, 0)
left = (-self.speed, 0)
if self.check_collision(up[0], up[1], 30, 30, maze):
possible_directions[up] = DIRECTION.UP
if self.check_collision(down[0], down[1], 30, 30, maze):
possible_directions[down] = DIRECTION.DOWN
if self.check_collision(right[0], right[1], 30, 30, maze):
possible_directions[right] = DIRECTION.RIGHT
if self.check_collision(left[0], left[1], 30, 30, maze):
possible_directions[left] = DIRECTION.LEFT
return possible_directions
# def get_next_move(self, pacman_pos, maze):
# possible_directions = self.get_possible_moves(maze)
#
# next_move = DIRECTION.RIGHT
# mn = 1000000 # really big number
#
# for pos, dir in possible_directions.items():
# h = self.heuristic(pacman_pos, pos)
# if h < mn:
# mn = h
# print("dir: ", dir)
# next_move = dir
#
# print("Min h:", mn)
# # print("Left: ", self.heuristic(pacman_pos))
# print("Best: next_move", next_move)
# return next_move
def get_next_move(self, pacman_pos, maze):
dx = [1, 0, -1, 0]
dy = [0, 1, 0, -1]
ret = len(dx) * [math.inf]
for i in range(len(dx)):
nx = self.x + dx[i] * self.speed
ny = self.y + dy[i] * self.speed
if self.check_collision(nx, ny, 30, 30, maze):
ret[i] = self.heuristic((nx, ny), pacman_pos)
min_idx = ret.index(min(ret))
# if min_idx == 1:
# print(f"({self.x}, {self.y})")
# print(self.check_collision(391, 79, 30, 30, maze))
return (dx[min_idx] * self.speed, dy[min_idx] * self.speed)
def move(self, maze, player_pos):
next_move = self.get_next_move(player_pos, maze)
dx = 0
dy = 0
self.x += next_move[0]
self.y += next_move[1]
# if next_move == DIRECTION.UP:
# self.ty = -self.speed
# self.tx = 0
# elif next_move == DIRECTION.DOWN:
# self.ty = self.speed
# self.tx = 0
# elif next_move == DIRECTION.RIGHT:
# self.tx = self.speed
# self.ty = 0
# elif next_move == DIRECTION.LEFT:
# self.tx = -self.speed
# self.ty = 0
#
#
# if self.check_collision(self.tx, self.ty, 30, 30, maze):
# dx = self.tx
# dy = self.ty
#
# if dx < 0:
# self.direction = DIRECTION.LEFT
# elif dx > 0:
# self.direction = DIRECTION.RIGHT
# elif dy < 0:
# self.direction = DIRECTION.UP
# elif dy > 0:
# self.direction = DIRECTION.DOWN
#
# if self.check_collision(dx, dy, 30, 30, maze):
# self.x += dx
# self.y += dy
def draw(self, screen):
radius = 30 // 2
pos = (self.x , self.y)
pygame.draw.circle(screen, 'green', pos, radius)
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