only one turtle shown on screen. Two are defined in the code below.
the turtle's heading and coordinates aren't being initialized.
我相信问题是你定义了一次随机的位置和方向，在海龟创造循环之外，所以它们都从同一个地方开始，以相同的速度朝同一个方向移动。一、 他们就在彼此之上。在
我们不需要@BlivetWidget的显式List来解决这个问题，因为正如您所发现的，海龟已经被维护在一个列表中，我们可以通过屏幕的turtles()方法获得该列表。下面是我对您的代码进行的修改，以解决各种问题：from turtle import Screen, Turtle
from random import randrange, randint
# parameters
COLORS = ['green', 'blue', 'red', 'orange', 'white']
ITERATIONS = 500
VELOCITY = 5
BOX_SIZE = 512
# setting up screen
screen = Screen()
screen.setup(BOX_SIZE + 50, BOX_SIZE + 50)
screen.bgcolor('black')
screen.tracer(False)
# drawing box
turtle = Turtle()
turtle.hideturtle()
turtle.color('cyan')
turtle.penup()
turtle.goto(-BOX_SIZE/2, -BOX_SIZE/2)
turtle.pendown()
for _ in range(4):
turtle.forward(BOX_SIZE)
turtle.left(90)
# turtle
for color in COLORS:
angle = randrange(360)
x = randint(-BOX_SIZE/2, BOX_SIZE/2)
y = randint(-BOX_SIZE/2, BOX_SIZE/2)
turtle = Turtle()
turtle.color(color)
turtle.setheading(angle)
turtle.penup()
turtle.setposition(x, y)
turtle.pendown()
# turtle movement
for _ in range(ITERATIONS):
for turtle in screen.turtles():
turtle.forward(VELOCITY)
x, y = turtle.position()
if x >= BOX_SIZE/2:
turtle.penup()
turtle.setx(-BOX_SIZE/2)
turtle.pendown()
elif x <= -BOX_SIZE/2:
turtle.penup()
turtle.setx(BOX_SIZE/2)
turtle.pendown()
elif y >= BOX_SIZE/2:
turtle.penup()
turtle.sety(-BOX_SIZE/2)
turtle.pendown()
elif y <= -BOX_SIZE/2:
turtle.penup()
turtle.sety(BOX_SIZE/2)
turtle.pendown()
screen.update()
screen.exitonclick()
我同意@BlivetWidget的观点，“你不需要创建一个类来将它们移动到你的起始位置”。我使用上面的一个简单循环。在
