问题描述
我有 2 个变量 n1 和 n2。当我按下空格时 randNum 要么等于 1 要么等于 2,如果它等于 1 那么我想改变 n1 如果它等于 2 那么我想改变n2。我正在使用 .itemconfig() 来更改变量,但我不知道如何将其分配给我想要更改的变量。我试图以某种方式用 f-string 来做,但这不起作用。有什么办法吗?这是我的代码:
import tkinter as tk
import random
canvas = tk.Canvas()
canvas.pack()
n1 = canvas.create_text(100,100,font="Arial 25",text="1")
n2 = canvas.create_text(100,150,text="2")
def function(event):
if event.keysym == 'space':
randNum = random.randint(1,2)
canvas.itemconfig(f"n{randNum}",fill="red",text=randNum) #does not work
canvas.bind_all('<Key>',function)
tk.mainloop()
解决方法
您可以使用 tags
的 create_text()
选项:
n1 = canvas.create_text(100,100,font="Arial 25",text="1",tags="n1")
n2 = canvas.create_text(100,150,text="2",tags="n2")
def function(event):
if event.keysym == 'space':
randNum = random.randint(1,2)
canvas.itemconfig(f"n{randNum}",fill="red",text=randNum)
,
如果您希望文本颜色在黑色和红色之间摆动,那么这里是一种选择。
n0 = canvas.create_text(100,text="1")
n1 = canvas.create_text(100,text="2")
def function(event):
r = random.randrange(2)
c = [ "red","black" ]
if r: c.reverse()
canvas.itemconfig( f"{n0}",fill=c[0] )
canvas.itemconfig( f"{n1}",fill=c[1] )
canvas.bind_all( '<space>',function )
,
你需要使用标签
import tkinter as tk
import random
def function(event=None):
rand_num = random.randint(1,2)
# resetting the color of existing elements
for i in range(1,3):
canvas.itemconfig(f"tag{i}",fill="black")
# highlighting the active one
canvas.itemconfig(f"tag{rand_num}",fill="red")
canvas = tk.Canvas()
canvas.pack()
n1 = canvas.create_text(100,tags="tag1")
n2 = canvas.create_text(100,tags="tag2")
canvas.bind_all('<space>',function)
tk.mainloop()