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snake.py
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snake.py
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# from pickletools import UP_TO_NEWLINE
# from tkinter import LEFT
from turtle import Turtle, position
STARTING_POS=[(0,0),(-20,0),(-40,0)]
MOVE_DISTANCE=20
UP=90
DOWN=270
LEFT=180
RIGHT=0
class Snake:
def __init__(self):
self.segments=[]
self.create_snake()
self.head=self.segments[0]
def create_snake(self):
for position in STARTING_POS:
self.add_segment(position)
def add_segment(self,position):
new_segment=Turtle(shape="square")
new_segment.color("white")
new_segment.penup()
new_segment.goto(position)
self.segments.append(new_segment)
def extend(self):
self.add_segment(self.segments[-1].position())
def move(self):
for seg_num in range(len(self.segments)-1,0,-1):
new_x=self.segments[seg_num-1].xcor()
new_y=self.segments[seg_num-1].ycor()
self.segments[seg_num].goto(new_x,new_y)
self.head.forward(MOVE_DISTANCE)
def up(self):
if self.head.heading() != DOWN:
self.head.setheading(UP)
def down(self):
if self.head.heading() != UP:
self.head.setheading(DOWN)
def right(self):
if self.head.heading() != LEFT:
self.head.setheading(RIGHT)
def left(self):
if self.head.heading() != RIGHT:
self.head.setheading(LEFT)