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import pygame
import time
import random
import math
from util import get_sprites
from settings import settings
from mode import MODE
from direction import DIRECTION
import map as Map
dx = [1, 0, -1, 0] # right, down, left, up
dy = [0, 1, 0, -1]
inv_dir = [2, 3, 0, 1]
sprite_sheet = [2, 0, 3, 1]
class Ghost():
def __init__(self, sprite_sheet, color, x, y):
self.x = x
self.y = y
self.sprite_sheet = sprite_sheet
self.name = "blinky"
self.sprite = get_sprites(sprite_sheet)
self.color = color
self.last_move = 3 # this represents the direction based on the dx, dy arrays
self.speed = 3
self.mode = MODE.SCATTERED
def in_bounds(self, pos):
(x, y) = pos
return (x >= 0) and (y >= 0) and (x < settings.width - 30) and (y < settings.height)
def heuristic(self, next_pos, tx, ty):
return abs(next_pos[0] - tx) + abs(next_pos[1] - ty)
# checks if the current position of pacman is either a dot, big dot or free
def is_valid(self, maze, x, y):
if x >= 0 and x < 30: # Necessary to make portals work
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)
return True
def get_default_tile(self):
return (75, 75)
def get_intial_tile(self):
return (12 * 30 + 15, 12 * 30 + 15)
# 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]
for i in range(len(direct_x)):
px = nx + direct_x[i] * 14
py = ny + direct_y[i] * 14
x = px // gx
y = py // gy
if not self.is_valid(maze, x, y):
return False
return True
def check_pacman_collision(self, game_state):
if game_state.pacman.powerup and abs(game_state.pacman.x - self.x) <= 30 and abs(game_state.pacman.y - self.y) <= 30:
initial_position = self.get_intial_tile()
time.sleep(1)
game_state.score += 200
self.x = initial_position[0]
self.y = initial_position[1]
elif not game_state.pacman.powerup and abs(game_state.pacman.x - self.x) <= 30 and abs(game_state.pacman.y - self.y) <= 30:
if abs(game_state.pacman.x - self.x) <= 30 and abs(game_state.pacman.y - self.y) <= 30:
game_state.is_pacman_alive = False
def get_next_move(self, game_state, screen):
default_tile = self.get_default_tile()
ret = len(dx) * [math.inf]
forbidden = inv_dir[self.last_move]
rand_pos = (0, 0)
if game_state.pacman.powerup:
self.mode = MODE.FRIGHETENED
rand_pos = random.randint(0, 900), random.randint(0, 990)
if game_state.pacman.powerup is False and self.mode == MODE.FRIGHETENED:
self.mode = MODE.CHASING
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, game_state.map.maze):
if i != forbidden:
if self.mode == MODE.SCATTERED:
ret[i] = self.heuristic(
(nx, ny), default_tile[0], default_tile[1])
elif self.mode == MODE.CHASING:
ret[i] = self.heuristic(
(nx, ny), game_state.pacman.x, game_state.pacman.y)
elif self.mode == MODE.FRIGHETENED:
ret[i] = self.heuristic(
(nx, ny), rand_pos[0], rand_pos[1])
if settings.debug:
pygame.draw.line(screen, self.color, (game_state.pacman.x, game_state.pacman.y),
(self.x, self.y), 1)
min_h = min(ret)
# Favour going up when there is a conflict
if min_h == ret[3] and min_h != math.inf:
return 3
# Favour going down than sideways when there is a conflict
if min_h == ret[1] and min_h != math.inf:
return 1
min_idx = ret.index(min_h)
return min_idx
def move(self, game_state, screen):
self.check_pacman_collision(game_state)
min_idx = self.get_next_move(game_state, screen)
new_dx = dx[min_idx] * self.speed
new_dy = dy[min_idx] * self.speed
self.x += new_dx
self.y += new_dy
self.x %= 900 # The logic of the portal
self.last_move = min_idx
def draw(self, screen, powerup, counter):
radius = 30 // 2
pos = (self.x - radius, self.y - radius)
if powerup:
self.sprite = get_sprites(pygame.image.load(
f'../assets/pacman_{self.color}.png').convert_alpha())
image = pygame.transform.scale(self.sprite[counter // 5], (35, 35))
if self.last_move == DIRECTION.UP.value:
screen.blit(pygame.transform.rotate(image, 270), pos)
elif self.last_move == DIRECTION.DOWN.value:
screen.blit(pygame.transform.rotate(image, 90), pos)
elif self.last_move == DIRECTION.RIGHT.value:
screen.blit(pygame.transform.flip(image, True, False), pos)
elif self.last_move == DIRECTION.LEFT.value:
screen.blit(image, pos)
else:
self.sprite = get_sprites(self.sprite_sheet)
image = pygame.transform.scale(
self.sprite[sprite_sheet[self.last_move]], (40, 40))
screen.blit(image, pos)
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