一个简易的贪吃蛇demo

 

 

import random
from tkinter import *
import time

LEFT = 0

RIGHT = 20

UPPER = 0

LOWER = 30


class Map:

    def __init__(self,root):
        self.canvas = Canvas(root, height = 600, width = 600, bg='black')
        self.canvas.pack()

    def paint(self,x,y,text,font = None):
        if font == None:
            self.canvas.create_text(y * 20, x * 20, text = text, fill = 'white')
        else:
            self.canvas.create_text(y * 20, x * 20, text=text, fill='white',font=font)

    def create(self,snake,food,score):
        for i in range(21):
            self.paint(0,i,text = '█')

        for i in range(1,30):
            self.paint(i,0, text='█')
            self.paint(i,20,text='█')

        for i in range(21):
            self.paint(30,i,text='█')

        self.paint(*food, text = '█')

        for item in snake:
            self.paint(*item,text='█')

        self.paint(15, 23, text='Score', font=('Couried', 14))
        self.paint(15, 25, text=':',font=('Couried', 14))
        self.paint(15, 27, text=f'{score}', font=('Couried', 14))

    def clear(self):
        self.canvas.delete(ALL)


class Snake:

    def __init__(self,root):
        self.body = [(1,1),(1,2),(1,3),(1,4)]
        self.vx = 0
        self.vy = 1
        root.bind('',self.up)
        root.bind('',self.down)
        root.bind('',self.left)
        root.bind('',self.right)
        root.focus_set()

    def __contains__(self, item):
        return item in self.body

    def __iter__(self):
        return iter(self.body)

    def __getitem__(self, item):
        return self.body[item]

    def move(self):
        self.body.pop(0)
        new_x = self.body[-1][0] + self.vx
        new_y = self.body[-1][1] + self.vy
        self.body.append((new_x, new_y))

    def up(self,event):
        self.vx = -1
        self.vy = 0

    def down(self,event):
        self.vx = 1
        self.vy = 0

    def right(self,event):
        self.vx = 0
        self.vy = 1

    def left(self,event):
        self.vx = 0
        self.vy = -1

    def eat(self,event):
        new_x = self.body[-1][0] + self.vx
        new_y = self.body[-1][1] + self.vy
        self.body.append((new_x, new_y))


def alive(snake):
    condition1 = snake[-1][0] > UPPER and snake[-1][0] < LOWER
    condition2 = snake[-1][1] > LEFT and snake[-1][1] < RIGHT
    condition3 = snake[-1] not in snake[:-1]
    return condition1 and condition2 and condition3


def game():
    root = Tk()
    map = Map(root)
    snake = Snake(root)
    food = (5, 8)
    score = 0
    map.create(snake, food, score)
    time.sleep(0.2)
    root.update()

    while alive(snake):
        map.clear()
        if food in snake:
            snake.eat(food)
            food = (random.randint(1,20), random.randint(1,20))
            score += 100
        else:
            snake.move()
        map.create(snake, food, score)
        time.sleep(0.2)
        root.update()

    mainloop()



game()