python中的海龟动画非常快

Question

我造了风车，但它跑得太快了。我使用turtle库来实现这一点，并且t2仅用于循环，t进行主要工作。我使用了tracer/update，我在tracer中尝试了一些数字，但没有任何变化。如何以正常速度制作动画

import turtle
screen = turtle.Screen()
screen.tracer(0)         
t2 = turtle.Turtle()
t2.speed(2)
t2.forward(50)
t2.setheading(90)
t2.circle(50)
t = turtle.Turtle()
t.speed(2)
def rectangle() :
    t.penup()
    t.forward(170)
    t.left(90)
    t.pendown()
    t.forward(5)
    t.left(90)
    t.forward(120)
    t.left(90)
    t.forward(10)
    t.left(90)
    t.forward(120)
    t.left(90)
    t.forward(5)
def windmill():
    for i in range(4):
        rectangle()
        t.penup()
        t.goto(0,0)
        t.pendown()
while True:
    t.clear()
    windmill()
    screen.update()
    t.left(10)

Answer 1

您可以使用内置time模块中的sleep方法：

import turtle
from time import sleep # Imported here

screen = turtle.Screen()
screen.tracer(0)         
t2 = turtle.Turtle()
t2.forward(50)
t2.setheading(90)
t2.circle(50)
t = turtle.Turtle()
def rectangle() :
    t.penup()
    t.forward(170)
    t.left(90)
    t.pendown()
    t.forward(5)
    t.left(90)
    t.forward(120)
    t.left(90)
    t.forward(10)
    t.left(90)
    t.forward(120)
    t.left(90)
    t.forward(5)
def windmill():
    for i in range(4):
        rectangle()
        t.penup()
        t.goto(0,0)
        t.pendown()
while True:
    sleep(0.05) # Used here
    t.clear()
    windmill()
    screen.update()
    t.left(10)

一种更平滑的方法是减少while循环每次迭代的left量：

import turtle

screen = turtle.Screen()
screen.tracer(0)         
t2 = turtle.Turtle()
t2.forward(50)
t2.setheading(90)
t2.circle(50)
t2.speed(2)
t = turtle.Turtle()
t.speed(2)
def rectangle() :
    t.penup()
    t.forward(170)
    t.left(90)
    t.pendown()
    t.forward(5)
    t.left(90)
    t.forward(120)
    t.left(90)
    t.forward(10)
    t.left(90)
    t.forward(120)
    t.left(90)
    t.forward(5)
def windmill():
    for i in range(4):
        rectangle()
        t.penup()
        t.goto(0,0)
        t.pendown()
while True:
    t.clear()
    windmill()
    screen.update()
    t.left(0.2) # Reduced here!

Answer 2

How can I do that animation at normal speed?

不要在海龟这样的事件驱动世界中使用while True:或sleep()！相反，请使用海龟计时器事件：

from turtle import Screen, Turtle

def rectangle(t):
    t.forward(50)
    t.left(90)
    t.backward(5)
    t.pendown()

    for _ in range(2):
        t.forward(10)
        t.right(90)
        t.forward(120)
        t.right(90)

    t.penup()

def windmill(t):
    for _ in range(4):
        t.penup()
        rectangle(t)
        t.goto(0, 0)

screen = Screen()
screen.tracer(0)

turtle = Turtle()
turtle.setheading(90)

def rotate():
    turtle.clear()
    windmill(turtle)
    screen.update()
    turtle.left(1)

    screen.ontimer(rotate, 40)  # adjust speed via second argument

rotate()

screen.mainloop()

可以将第二个参数调整为ontimer()（以毫秒为单位），以控制动画的运行速度