回答此问题可获得 20 贡献值,回答如果被采纳可获得 50 分。
<pre><code>from tkinter import *
def move():
global x1, y1, dx, dy, flag, n
x1, y1 = x1 + dx, y1 + dy
if x1 > 360:
n = 0
x1, dx, dy = 360, 0, 15
if y1 > 360:
n = 1
y1, dx, dy = 360, -15, 0
if x1 < 10:
x1, dx, dy = 10, 0, -15
n = 2
if y1 < 10:
y1, dx, dy = 10, 15, 0
n = 3
can1.coords(oval1, x1, y1, x1 + 30, y1 + 30)
if flag > 0:
abl1.after(50, move)
def stop():
global flag
flag = 0
def start():
global flag
if flag == 0:
flag = 1
move()
###
x1, y1 = 10, 10
dx, dy = 15, 0
color = [["white"], ["red"], ["green"], ["blue"]]
n = 0
flag = 0
###
abl1 = Tk()
abl1.title("Animációs gyakorlat Tkinter-rel")
can1 = Canvas(abl1, bg = "dark grey", height = 400, width = 400)
can1.pack(side=LEFT)
oval1 = can1.create_oval(x1, y1, x1 + 30, y1 + 30, fill = color[n])
but1 = Button(abl1, text = "Quit", command = abl1.destroy).pack(side=BOTTOM)
but2 = Button(abl1, text = "Start", command = start).pack()
but3 = Button(abl1, text = "Stop", command = stop).pack()
abl1.mainloop()
</code></pre>
<p>当球到达正方形的边缘时,它必须改变颜色。现在有了这个颜色列表,如果有了ifs,它什么也做不了,我也不知道出了什么问题。我尝试了很多不同的变体,但也没用。
谢谢你的帮助。在</p>