问题描述
限时送ChatGPT账号..我正在尝试制作一个骰子对象,并且我希望能够控制点子颜色.我用黑色填充创建了点子,并尝试使用
I'm trying to make a dice object, and I want to be able to control the pip colors. I created the pips with a black fill, and I tried to change one to red using
self.canvas.itemconfigure(self.pip1, fill='red')
但是好像没有效果.没有错误,所以我想知道为什么没有显示更改.
but it seems to have no effect. There is no error so I'm wondering why the change doesn't show up.
最小工作示例:
from tkinter import *
from tkinter import ttk
class Dice:
#the x and y instancing variables are for the x and y coordinates of the top left corner of the rectangle
def __init__(self, win, x, y):
self.win = win
self.win.geometry("500x500")
self.canvas = Canvas(self.win)
self.canvas.place(x=0, y=0)
die = self.canvas.create_rectangle(x, y, x+88, y+88, fill='white', width=1)
offset = 20
#create 7 circles for pip locations:
self.pip1 = self.pips(x+offset, y+offset)
self.pip2 = self.pips(x+offset, y+2*offset)
self.pip3 = self.pips(x+offset, y+3*offset)
self.pip4 = self.pips(x+2*offset, y+2*offset)
self.pip5 = self.pips(x+3*offset, y+offset)
self.pip6 = self.pips(x+3*offset, y+2*offset)
self.pip7 = self.pips(x+3*offset, y+3*offset)
self.canvas.itemconfigure(self.pip1, fill='red')
def pips(self, x, y):
pip = self.canvas.create_oval(x, y, x+9, y+9, fill='black', width=0)
#def setValue(self, value)
#def pipsOff(self, pip):
def test():
x = Dice(Tk(), 50, 50)
mainloop()
推荐答案
调试的第一条规则:检查您的数据.如果您在调用 itemconfigure
之前放置打印语句或停止调试器,您将看到 self.pip1
的值为 None
.所以你应该问自己的第一件事是,为什么它是 None
?"
First rule of debugging: examine your data. If you put a print statement or stop the debugger just before the call to itemconfigure
you will see that self.pip1
has a value of None
. So the first thing you should ask yourself is, "why is it None
?"
它是 None
的原因是你在一个方法中创建它但忽略了返回项目 id.因此,解决您的问题的方法是在函数 pips
的末尾添加 return pip
:
The reason it is None
is that you create it in a method but neglect to return the item id. So, the fix to your problem is to add return pip
at the end of the function pips
:
def pips(self, x, y):
pip = self.canvas.create_oval(x, y, x+9, y+9, fill='black', width=0)
return pip
这篇关于tkinter 画布项目配置的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
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