画布中的python时间睡眠方法 [英] python time sleep method in canvas

问题描述

这就是我想要做的.非常简单的代码.从一点到另一点逐渐画线.这是我的代码:

This is what I am trying to do. Very simple code. Draw line from one point to another gradually. Here's my code:

from Tkinter import *
import time

mGui = Tk()
mGui.title('GUI Example')
mGui.geometry('1024x576+10+30')

#Canvas
canvas_1 = Canvas(mGui,height=500,width=500,bg='grey')

for i in range(1, 500):
    time.sleep(0.5)
    canvas_1.create_line(0,0,i,i)
    canvas_1.update()

canvas_1.pack()

mGui.mainloop()

我的窗口只保持空白 0.5*500 秒(250 秒)，然后画布显示绘制的线条.我究竟做错了什么?

My window just stays blank white 0.5*500 seconds (250 seconds) and then canvas shows up with the line drawn. What am I doing wrong?

推荐答案

您需要在开始循环之前调用画布上的 pack 方法:

You need to call the pack method on the canvas before you start the loop:

from Tkinter import *
import time

mGui = Tk()
mGui.title('GUI Example')
mGui.geometry('1024x576+10+30')

#Canvas
canvas_1 = Canvas(mGui,height=500,width=500,bg='grey')

#################
canvas_1.pack()
#################

for i in range(1, 500):
    time.sleep(0.5)
    canvas_1.create_line(0,0,i,i)
    canvas_1.update()

mGui.mainloop()

否则，直到循环退出后，画布才会放置在窗口上.

Otherwise, the canvas will not be placed on the window until after the loop exits.

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