怎样从零开始用 Python 写一个贪吃蛇

如题所述

先看懂
import copy
import random
import os
import msvcrt

# the board class, used to put everything
class board:

__points =[]

def __init__(self):
self.__points.clear()
for i in range(22):
line = []
if i == 0 or i == 21:
for j in range(22):
line.append('#')
else:
line.append('#')
for j in range(20):
line.append(' ')
line.append('#')
self.__points.append(line)

def getPoint(self, location):
return self.__points[location[0]][location[1]]

def clear(self):
self.__points.clear()
for i in range(22):
line = []
if i == 0 or i == 21:
for j in range(22):
line.append('#')
else:
line.append('#')
for j in range(20):
line.append(' ')
line.append('#')
self.__points.append(line)

def put_snake(self, snake_locations):
# clear the board
self.clear()

# put the snake points
for x in snake_locations:
self.__points[x[0]][x[1]] = 'o'

# the head
x = snake_locations[len(snake_locations) - 1]
self.__points[x[0]][x[1]] = 'O'

def put_food(self, food_location):
self.__points[food_location[0]][food_location[1]] = '*'

def show(self):
os.system("cls")
for i in range(22):
for j in range(22):
print(self.__points[i][j], end='')
print()

# the snake class
class snake:
__points = []

def __init__(self):
for i in range(1, 6):
self.__points.append([1, i])

def getPoints(self):
return self.__points

# move to the next position
# give the next head
def move(self, next_head):
self.__points.pop(0)
self.__points.append(next_head)

# eat the food
# give the next head
def eat(self, next_head):
self.__points.append(next_head)

# calc the next state
# and return the direction
def next_head(self, direction='default'):

# need to change the value, so copy it
head = copy.deepcopy(self.__points[len(self.__points) - 1])

# calc the "default" direction
if direction == 'default':
neck = self.__points[len(self.__points) - 2]
if neck[0] > head[0]:
direction = 'up'
elif neck[0] < head[0]:
direction = 'down'
elif neck[1] > head[1]:
direction = 'left'
elif neck[1] < head[1]:
direction = 'right'

if direction == 'up':
head[0] = head[0] - 1
elif direction == 'down':
head[0] = head[0] + 1
elif direction == 'left':
head[1] = head[1] - 1
elif direction == 'right':
head[1] = head[1] + 1
return head

# the game
class game:

board = board()
snake = snake()
food = []
count = 0

def __init__(self):
self.new_food()
self.board.clear()
self.board.put_snake(self.snake.getPoints())
self.board.put_food(self.food)

def new_food(self):
while 1:
line = random.randint(1, 20)
column = random.randint(1, 20)
if self.board.getPoint([column, line]) == ' ':
self.food = [column, line]
return

def show(self):
self.board.clear()
self.board.put_snake(self.snake.getPoints())
self.board.put_food(self.food)
self.board.show()

def run(self):
self.board.show()

# the 'w a s d' are the directions
operation_dict = {b'w': 'up', b'W': 'up', b's': 'down', b'S': 'down', b'a': 'left', b'A': 'left', b'd': 'right', b'D': 'right'}
op = msvcrt.getch()

while op != b'q':
if op not in operation_dict:
op = msvcrt.getch()
else:
new_head = self.snake.next_head(operation_dict[op])

# get the food
if self.board.getPoint(new_head) == '*':
self.snake.eat(new_head)
self.count = self.count + 1
if self.count >= 15:
self.show()
print("Good Job")
break
else:
self.new_food()
self.show()

# 反向一Q日神仙
elif new_head == self.snake.getPoints()[len(self.snake.getPoints()) - 2]:
pass

# rush the wall
elif self.board.getPoint(new_head) == '#' or self.board.getPoint(new_head) == 'o':
print('GG')
break

# normal move
else:
self.snake.move(new_head)
self.show()
op = msvcrt.getch()

game().run()

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