Python Canvas 不会自动扩展为海龟打印

Question

我有一个关于 L 系统的项目。我试图添加一个打印 L 系统的海龟；但是，与文本字段不同，画布不会扩展。当我打印更多文本时，我的文本字段通过滚动条扩展得很好。但是，乌龟卡在画布上。我真的被困住了。

frame2 = tki.Frame(frame, bg='yellow', width=810, height=510)
frame2.pack()
frame2.place(x=500,y=5)
cv = Canvas(frame2, width=2000, height=2000)
cv.place(x=0, y=0)

screen = turtle.TurtleScreen(cv)
t = turtle.RawTurtle(screen)

hbar=Scrollbar(frame2,orient=HORIZONTAL)
hbar.pack(side=BOTTOM,fill=X)
hbar.config(command=cv.xview)
vbar=Scrollbar(frame2,orient=VERTICAL)
vbar.pack(side=RIGHT,fill=Y)
vbar.config(command=cv.yview)
cv.config(width=800,height=500)
cv.config(xscrollcommand=hbar.set, yscrollcommand=vbar.set)
cv.pack(side=LEFT,expand=True,fill=BOTH)

Answer 1

如果我正确理解您的问题，为什么海龟库为此目的提供的ScrolledCavas 不适合您：

编辑：我已经从框架大小开始画布大小，并添加了ScrolledCanvas 的reset() 方法来动态扩展画布：

import tkinter as tk
from turtle import TurtleScreen, RawTurtle, ScrolledCanvas

size = 100
canvsize = 300

root = tk.Tk()
root.geometry('600x500')

frame = tk.Frame(root, width=300, height=300)
frame.pack()
frame.place(x=50, y=50)

canvas = ScrolledCanvas(frame, canvwidth=canvsize, canvheight=canvsize)
canvas.pack(side=tk.LEFT)

screen = TurtleScreen(canvas)
screen.bgcolor('yellow')

turtle = RawTurtle(screen, visible=False)
turtle.dot(size, "green")

def expand():
    global canvsize, size

    if size < 800:
        size += 10
        if size > canvsize:
            canvsize += 100
            canvas.reset(canvwidth=canvsize, canvheight=canvsize)

        turtle.dot(size, "green")
        screen.ontimer(expand, 100)

screen.ontimer(expand, 100)

screen.mainloop()