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11 Snake game

Requirements

  1. Run the code in console using command line.
  2. It'll open a Python window to play the snake game.

What will we practice in this project?

  • turtle diagram
  • key event handle
  • if condition
  • timer
  • object clone
  • list

A reference code

from turtle import *
from random import randint

gz = 22
bc = gz * 8

screen = Screen()
screen.bgcolor("darkblue")

food = Turtle()
food.color("red")
food.shape("square")
food.up()
food.speed(0)
food.goto(randint(-bc+gz, bc-gz)//gz*gz, randint(-bc+gz, bc-gz)//gz*gz)

liner = Turtle()
liner.speed(0)
liner.up()
liner.goto(-bc, bc)
liner.color("white")
liner.pensize(5)
liner.down()
for i in range(4):
    liner.fd(bc*2)
    liner.rt(90)
liner.ht()

score = 0
judge = Turtle()
judge.speed(0)
judge.up()
judge.goto(0, bc+20)
judge.color("white")
judge.write("得分:{}".format(score), align="center", font=("Kai", 20, "bold"))
judge.ht()

head = Turtle()
head.speed(0)
head.up()
head.color("cyan")
head.shape("square")

snake = []
snake.append(head)
for i in range(2):
    body = head.clone()
    body.color("white")
    body.goto(head.xcor()+(i+1)*gz, head.ycor())
    snake.append(body)

d = [-1, 0]
def move():
    last = snake.pop()
    first = snake[0]
    first.color("white")
    last.goto(first.xcor() + d[0] * gz, first.ycor() + d[1] * gz)
    last.color("cyan")
    snake.insert(0, last)
    
    if snake[0].xcor() == food.xcor() and snake[0].ycor() == food.ycor():
        food.ht()
        food.goto(randint(-bc+gz, bc-gz)//gz*gz, randint(-bc+gz, bc-gz)//gz*gz)
        food.st()
        body = snake[-1].clone()
        snake.append(body)
        global score
        score += 1
        judge.clear()
        judge.write("得分:{}".format(score), align="center", font=("Kai", 20, "bold"))
    
    if (snake[0].xcor() > -bc and snake[0].xcor() < bc) and \
       (snake[0].ycor() > -bc and snake[0].ycor() < bc):
        screen.ontimer(move, 500)
        
def up():
    global d
    if d[1] != -1:
        d = [0, 1]
def down():
    global d
    if d[1] != 1:
        d = [0, -1]
def left():
    global d
    if d[0] != 1:
        d = [-1, 0]
def right():
    global d
    if d[0] != -1:
        d = [1, 0]

screen.onkey(up, "Up")
screen.onkey(down, "Down")
screen.onkey(left, "Left")
screen.onkey(right, "Right")

screen.listen()

move()

Run the demo

Please save the Python as snake.py and run it in console：

python snake.py

Chanllenge 11

贪吃蛇小游戏

项目需求

  • 直接在控制台使用命令行运行
  • 运行之后出现贪吃蛇小游戏

项目练习

  • turtle
  • 键盘事件响应
  • 条件语句
  • 定时器
  • 对象克隆
  • 列表

项目参考代码

from turtle import *
from random import randint

gz = 22
bc = gz * 8

screen = Screen()
screen.bgcolor("darkblue")

food = Turtle()
food.color("red")
food.shape("square")
food.up()
food.speed(0)
food.goto(randint(-bc+gz, bc-gz)//gz*gz, randint(-bc+gz, bc-gz)//gz*gz)

liner = Turtle()
liner.speed(0)
liner.up()
liner.goto(-bc, bc)
liner.color("white")
liner.pensize(5)
liner.down()
for i in range(4):
    liner.fd(bc*2)
    liner.rt(90)
liner.ht()

score = 0
judge = Turtle()
judge.speed(0)
judge.up()
judge.goto(0, bc+20)
judge.color("white")
judge.write("得分:{}".format(score), align="center", font=("Kai", 20, "bold"))
judge.ht()

head = Turtle()
head.speed(0)
head.up()
head.color("cyan")
head.shape("square")

snake = []
snake.append(head)
for i in range(2):
    body = head.clone()
    body.color("white")
    body.goto(head.xcor()+(i+1)*gz, head.ycor())
    snake.append(body)

d = [-1, 0]
def move():
    last = snake.pop()
    first = snake[0]
    first.color("white")
    last.goto(first.xcor() + d[0] * gz, first.ycor() + d[1] * gz)
    last.color("cyan")
    snake.insert(0, last)
    
    if snake[0].xcor() == food.xcor() and snake[0].ycor() == food.ycor():
        food.ht()
        food.goto(randint(-bc+gz, bc-gz)//gz*gz, randint(-bc+gz, bc-gz)//gz*gz)
        food.st()
        body = snake[-1].clone()
        snake.append(body)
        global score
        score += 1
        judge.clear()
        judge.write("得分:{}".format(score), align="center", font=("Kai", 20, "bold"))
    
    if (snake[0].xcor() > -bc and snake[0].xcor() < bc) and \
       (snake[0].ycor() > -bc and snake[0].ycor() < bc):
        screen.ontimer(move, 500)
        
def up():
    global d
    if d[1] != -1:
        d = [0, 1]
def down():
    global d
    if d[1] != 1:
        d = [0, -1]
def left():
    global d
    if d[0] != 1:
        d = [-1, 0]
def right():
    global d
    if d[0] != -1:
        d = [1, 0]

screen.onkey(up, "Up")
screen.onkey(down, "Down")
screen.onkey(left, "Left")
screen.onkey(right, "Right")

screen.listen()

move()

测试运行

将代码保存为snake.py，然后在控制台运行：

python snake.py

挑战11