整个屏幕不随乌龟移动

Question

我正在 python 使用 python 中的 turtle 模块制作游戏。我想让屏幕和乌龟一起移动。有什么办法吗？谢谢

Answer 1

The problem is that the screen isn't moving with the turtle ... Does anyone know why?

我知道为什么。首先，@martineau 是正确的，像往常一样 +1，关于将错误的值范围传递给 yview_moveto()。但是这个谜题还有另一块：tkinter 和 turtle 不使用相同的坐标系！您需要修正坐标系差异，然后将值转换为百分比。

这是一个基于您的代码和所需行为的精简示例。它使球保持在 window 的中间，但您可以从数字和垂直滚动条中看出它正在下落。点击向上箭头以减慢速度 - 再次点击以停止运动。再次点击它开始上升。或使用向下箭头再次反转您的移动：

from turtle import Screen, Turtle

WIDTH, DEPTH = 300, 10_000
CURSOR_SIZE = 20

vy = -10

def rise():
    global vy
    vy += 5

def fall():
    global vy
    vy -= 5

def move():
    global vy

    if abs(ball.ycor()) < DEPTH/2:
        ball.forward(vy)

        canvas.yview_moveto((DEPTH/2 - ball.ycor() - WIDTH/2 + CURSOR_SIZE) / DEPTH)

        screen.update()
        screen.ontimer(move)

screen = Screen()
screen.setup(WIDTH, WIDTH)  # visible window
screen.screensize(WIDTH, DEPTH)  # area window peeps into
screen.tracer(False)

canvas = screen.getcanvas()

marker = Turtle()
marker.hideturtle()
marker.penup()
marker.setx(-WIDTH/4)  # so we can see we're moving

for y in range(-DEPTH//2, DEPTH//2, 100):
    marker.sety(y)
    marker.write(y, align='right')

ball = Turtle('circle')
ball.speed('fastest')
ball.setheading(90)
ball.penup()

screen.onkey(rise, 'Up')
screen.onkey(fall, 'Down')
screen.listen()

move()

screen.mainloop()

整个屏幕不随乌龟移动

Entire screen not moving with the turtle

python

python-3.x

turtle-graphics

python-turtle