乒乓球拍打不准

Question

我正在尝试使用 Python 3 制作乒乓球游戏，并且可以说我已经走得很远了。我现在遇到了一个错误（错误不是错误），球在击中桨边缘时不会反弹。相反，它一直等到它击中桨的中心；可能是由于我使用的 ycor 函数。这是我到目前为止的代码：

import turtle
    


wn = turtle.Screen()
wn.bgcolor('white')
wn.title("Ping Pong")
wn.tracer(0)
wn.setup(width=800, height=600)


pad1 = turtle.Turtle()
pad1.shape('square')
pad1.penup()
pad1.shapesize(5, 1)
pad1.speed(0)
pad1.goto(-340, 0)
pad1.speed(0)


pad2 = turtle.Turtle()
pad2.shape('square')
pad2.penup()
pad2.shapesize(5, 1)
pad2.speed(0)
pad2.goto(340, 0)
pad2.speed(0)

ball = turtle.Turtle()
ball.shape("circle")
ball.penup()

ball.color('black')
ball.speed(0)
ball.dy = -0.2
ball.dx = -0.2


def paddle_a_up():
    y = pad1.ycor()
    y += 20
    pad1.sety(y)


def paddle_a_down():
    y = pad1.ycor()
    y -= 20
    pad1.sety(y)


def paddle_b_up():
    y = pad2.ycor()
    y += 20
    pad2.sety(y)


def paddle_b_down():
    y = pad2.ycor()
    y -= 20
    pad2.sety(y)


wn.listen()
wn.onkeypress(paddle_a_up, "w")
wn.onkeypress(paddle_a_down, "s")

wn.onkeypress(paddle_b_up, "Up")
wn.onkeypress(paddle_b_down, "Down")
while True:
    wn.update()
    ball.sety(ball.ycor() + ball.dy)
    ball.setx(ball.xcor() + ball.dx)



    if ball.ycor() < -270:
        ball.dy *= -1


    if ball.ycor() > 280:
        ball.dy *= -1

    if ball.xcor() < -380:
        ball.goto(0, 0)
        ball.dx *= -1



    if ball.xcor() > 380:
        ball.goto(0, 0)
        ball.dx *= -1



    if (ball.xcor() > 340 and ball.xcor() < 350) and (ball.ycor() < pad2.ycor() + 40 and 
ball.ycor() > pad2.ycor - 40):
        ball.setx(340)
        ball.dx *= -1

这是

if (ball.xcor() > 340 and ball.xcor() < 350) and (ball.ycor() < pad2.ycor() + 40 and 
ball.ycor() > pad2.ycor - 40):

给我带来所有麻烦的声明。我是一个初学者程序员，但所有类型的答案都值得赞赏。提前致谢！

Answer 1

给我带来这么多麻烦的声明。

if (ball.xcor() > 340 and ball.xcor() < 350) and (ball.ycor() < pad2.ycor() + 40 and 
ball.ycor() > pad2.ycor - 40):

没有问题，只是您的错字问题，您将方法作为属性调用，这就是为什么您在上面的行中将pad2.ycor替换为pad2.ycor()，这样您的行就变成了

if (ball.xcor() > 340 and ball.xcor() < 350) and (ball.ycor() < pad2.ycor() + 40 and 
ball.ycor() > pad2.ycor() - 40):

对于第一个垫子，在优化并添加额外条件后，您错过了条件对来评估其与球的碰撞，您的代码现在变为以下状态

import turtle
    


wn = turtle.Screen()
wn.bgcolor('white')
wn.title("Ping Pong")
wn.tracer(0)
wn.setup(width=800, height=600)


pad1 = turtle.Turtle()
pad1.shape('square')
pad1.penup()
pad1.shapesize(5, 1)
pad1.speed(0)
pad1.goto(-340, 0)
pad1.speed(0)


pad2 = turtle.Turtle()
pad2.shape('square')
pad2.penup()
pad2.shapesize(5, 1)
pad2.speed(0)
pad2.goto(340, 0)
pad2.speed(0)

ball = turtle.Turtle()
ball.shape("circle")
ball.penup()

ball.color('black')
ball.speed(0)
ball.dy = -0.2
ball.dx = -0.2


def paddle_a_up():
    y = pad1.ycor()
    y += 20
    pad1.sety(y)


def paddle_a_down():
    y = pad1.ycor()
    y -= 20
    pad1.sety(y)


def paddle_b_up():
    y = pad2.ycor()
    y += 20
    pad2.sety(y)


def paddle_b_down():
    y = pad2.ycor()
    y -= 20
    pad2.sety(y)


wn.listen()
wn.onkeypress(paddle_a_up, "w")
wn.onkeypress(paddle_a_down, "s")

wn.onkeypress(paddle_b_up, "Up")
wn.onkeypress(paddle_b_down, "Down")
while True:
    wn.update()
    ball.sety(ball.ycor() + ball.dy)
    ball.setx(ball.xcor() + ball.dx)

    if ball.ycor() < -270 or ball.ycor() > 280:
        ball.dy *= -1

    if ball.xcor() < -380 or ball.xcor() > 380:
        ball.goto(0, 0)
        ball.dx *= -1
    
    if (ball.xcor() < -340 and ball.xcor() > -350) and (ball.ycor() < pad1.ycor() + 40 and ball.ycor() > pad1.ycor() - 40):
        ball.setx(-340)
        ball.dx *= -1

    if (ball.xcor() > 340 and ball.xcor() < 350) and (ball.ycor() < pad2.ycor() + 40 and ball.ycor() > pad2.ycor() - 40):
        ball.setx(340)
        ball.dx *= -1