代码如下
import turtle as t
import random as r
class Snake():
def __init__(self,long,color,walls):#成员函数
self.walls=walls
t.pendown()
t.pensize(5)
self.color=color
t.pencolor(self.color)
x0=0
y0=0
p0=(x0,y0)
t.penup()
t.goto(p0[0],p0[1])
t.pendown()
body=[]
body.append(p0)
t.hideturtle()
for i in range(long):#****
arc=r.randint(-90,90)
print(arc)
t.seth(arc)
t.forward(20)
snake_point=t.pos()
body.append(snake_point)
self.body=body
self.heading=t.heading()
def erase_tail(self):
t.penup()
t.goto(self.body[0][0],self.body[0][1])
t.pendown()
t.pencolor('white')
t.goto(self.body[1][0],self.body[1][1])
for i in range(len(self.body)-1):#三节蛇，列表有四个元素
self.body[i]=self.body[i+1]
t.penup()
def go_forward(self):
t.setheading(self.heading)
long=len(self.body)-1
while True:
t.goto(self.body[long][0],self.body[long][1])
direction=r.randint(0,2)
arc=r.randint(0,90)
if direction==0:
t.left(arc)#往前走一步
elif direction==1:
pass
elif direction==2:
t.right(arc)#往前走一步
t.forward(10)
snake_point=t.pos()
if self.walls.not_collision(snake_point):
break
t.goto(self.body[long][0],self.body[long][1])
t.pendown()
t.pencolor(self.color)
t.goto(snake_point[0],snake_point[1])
self.body[long]=snake_point
self.heading=t.heading()
def go(self):
self.erase_tail()
self.go_forward()
class Walls():
def __init__(self,width,height,startx,starty):
self.width=width
self.height=height
self.startx=startx
self.starty=starty
def not_collision(self,snake_point):
if -self.width/2<snake_point[0]<self.width/2 and -self.height/2<snake_point[1]<self.height/2:
return True
def drawWindow(self):
t.delay(delay=0)
t.setup(self.width,self.height, self.startx, self.starty)
def drawWalls(self):
drawRect(self.width,self.height,-self.width/2,self.height/2)
def drawRect(width,height, startx, starty):
t.penup()
t.goto(startx, starty)
t.setheading(0)
t.pencolor('black')
t.pendown()
t.forward(width)
t.right(90)
t.forward(height)
t.right(90)
t.forward(width)
t.right(90)
t.forward(height)
walls=Walls(400,300,0,0)
walls.drawWindow()
walls.drawWalls()
snake1=Snake(4,'red',walls)
snake2=Snake(6,'green',walls)
snake3=Snake(8,'green',walls)
for _ in range(500):
snake1.go()
snake2.go()
snake3.go()
t.done()
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sys.exit(0)