缩放乌龟绘图 python

Question

我正在尝试编写一个 python 脚本，该脚本采用 n 并根据该顺序绘制希尔伯特曲线。我的算法工作正常它绘制曲线并在更改 window 大小时重新调整大小。但是，我的绘图没有居中并且可能超出范围。我想用屏幕缩放曲线而没有太多空白 space 或让它越界

这是我的代码：

import sys
import turtle
from turtle import Turtle, Screen


#Drawing the hilbert curve using recursion.
#Var: turtle if for the Turtle, A is the length of the lines, parity is for inverting the direction, and n is for the order
def hilbert_curve(turtle, A, parity, n):

if n < 1:
    return

turtle.left(parity * 90)
hilbert_curve(turtle, A, - parity, n - 1)
turtle.forward(A)
turtle.right(parity * 90)
hilbert_curve(turtle, A, parity, n - 1)
turtle.forward(A)
hilbert_curve(turtle, A, parity, n - 1)
turtle.right(parity * 90)
turtle.forward(A)
hilbert_curve(turtle, A, - parity, n - 1)
turtle.left(parity * 90)



def main():
    #Rescale the drawing when changing the window size
    def onResize(x=0, y=0):
     width = my_win.window_width()
     hight = my_win.window_height()
     my_win.setworldcoordinates(-width-1, -hight-1, width-1, hight-1)
     my_win.ontimer(onResize,100)


#initilize the turtle.
turtle = Turtle()
#initilize the screen.
my_win = Screen()
w = my_win.window_width()
h = my_win.window_height()
A = 20
onResize()




rule = 1
my_win.tracer(False)
if len(sys.argv) < 2:
    print("Please declare the order after calling the program name")
    return
n = int(sys.argv[1])
hilbert_curve(turtle,A,rule,n)

my_win.update()
my_win.mainloop()


main()

**如果有人能解决我的问题，我将不胜感激**

Answer 1

my algorithm work fine it draws the the curve and rescale the size when changing the window size.

不，不是。您的绘图从未缩放过，它保持相同的大小。设置缩放代码的 main() 函数是 never 调用，因为它遵循 mainloop() 调用，将控制权移交给 tkinter 事件处理程序：

my_win.mainloop()

main()

使用事件计时器是解决此问题的错误方法。然而，由于 turtle 不暴露底层的 tkinter window resize 事件，让我们一起玩这个模型，而不是下降到 tkinter 层。我会这样做：

from turtle import Turtle, Screen

def hilbert_curve(turtle, A, parity, n):

    '''
    Draw the hilbert curve using recursion.

    Arguments:
        turtle is for the Turtle,
        A is the length of the lines,
        parity is for inverting the direction,
        and n is for the order
    '''

    if n < 1:
        return

    turtle.left(parity * 90)
    hilbert_curve(turtle, A, - parity, n - 1)
    turtle.forward(A)
    turtle.right(parity * 90)
    hilbert_curve(turtle, A, parity, n - 1)
    turtle.forward(A)
    hilbert_curve(turtle, A, parity, n - 1)
    turtle.right(parity * 90)
    turtle.forward(A)
    hilbert_curve(turtle, A, - parity, n - 1)
    turtle.left(parity * 90)

def main():
    order = 4
    parity = 1
    length = 100 / (4 * order - 1)

    def onResize():
        # Rescale drawing when changing window size (the hard way)
        turtle.reset()
        screen.setworldcoordinates(0, 0, 100, 100)
        hilbert_curve(turtle, length, parity, order)
        screen.update()
        screen.ontimer(onResize, 1000)

    screen = Screen()
    screen.tracer(False)

    turtle = Turtle()

    onResize()

    screen.mainloop()

main()

即无论 window 大小如何，都保持恒定的虚拟坐标并重新绘制曲线以适应当前的 window 大小。顺便说一句，didn't I write this Hilbert curve code？确保为您从哪里获得它投票！

缩放乌龟绘图 python

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