[已解决]调整画笔粗细跟选择颜色的下拉菜单项事件怎么不执行了，求检查代码

小诺爷

# -*- coding:utf-8 -*-
from tkinter import *
from tkinter import colorchooser
import tkinter
win=tkinter.Tk()




win.title("简单小部件！")
win.geometry('250x120+50+10')
label=tkinter.Label(win,\
                    text='欢迎来到我的世界！',\
                    font='宋体',\
                    fg='#0000ff'
                    )

label.pack()
def eBtnClickme():
    root = Tk()
    root.title("画图")

    var = IntVar()
    var.set(1)

    w = Canvas(root, width=1350, height=700)
    w.pack()

    THICK = 7
    THIN = 2
    MEDIUM = 4
    THICKNESS = THIN
    COLOR = "#ff0000"
   
   
    def paint(event):
        x1, y1 = (event.x - THICKNESS), (event.y - THICKNESS)
        x2, y2 = (event.x + THICKNESS), (event.y + THICKNESS)
        w.create_oval(x1, y1, x2, y2, fill=COLOR)


    def thickness(tn):
        global THICKNESS
        THICKNESS = tn
   

    def choosecolor():
         global COLOR
         COLOR = colorchooser.askcolor()[1]
    mb = Menu(root)
   
    thmenu = Menu(mb, tearoff=False)
    thmenu.add_radiobutton(variable=var, value=1, label="细",
                       command=lambda: thickness(THIN))
    thmenu.add_radiobutton(variable=var, value=2, label="中",
                       command=lambda: thickness(MEDIUM))
    thmenu.add_radiobutton(variable=var, value=3, label="粗",
                       command=lambda: thickness(THICK))
    mb.add_cascade(label="调整画笔粗细", menu=thmenu)
    colormenu = Menu(mb, tearoff=False)
    colormenu.add_command(label="调整画笔颜色", command=choosecolor)

    mb.add_cascade(label="选择颜色", menu=colormenu)

    root.config(menu=mb)

    w.bind("<B1-Motion>", paint)
    w.bind("<B3-Motion>", paint)
btn1=tkinter. Button (win,text ='画布！',bg='green' , command=eBtnClickme)
btn1.pack()
mainloop()

最佳答案

月排行榜 / 总排行榜

Twilight6

2020-6-9 19:31:07

研究了半天，还是没搞明白为什么在事件里 的THICKNESS 和 COLOR 都是初始值

你可以在你原代码上进行print 测试，会发现打印的一直是2，所以我干脆放弃想了，重新帮你写了下，你看看~

1. # -*- coding:utf-8 -*-
   
2. from tkinter import *
   
3. from tkinter import colorchooser
   
4. import tkinter
   
5. 
   
6. win = tkinter.Tk()
   
7. 
   
8. win.title("简单小部件！")
   
9. win.geometry('250x120+50+10')
   
10. label = tkinter.Label(win, \
    
11.                       text='欢迎来到我的世界！', \
    
12.                       font='宋体', \
    
13.                       fg='#0000ff'
    
14.                       )
    
15. 
    
16. label.pack()
    
17. 
    
18. 
    
19. def eBtnClickme():
    
20.     root = Tk()
    
21.     root.title("画图")
    
22. 
    
23.     var = IntVar()
    
24. 
    
25. 
    
26.     w = Canvas(root, width=1350, height=700)
    
27.     w.pack()
    
28. 
    
29.     THICK = 7
    
30.     THIN = 2
    
31.     MEDIUM = 4
    
32.     THICKNESS = IntVar()
    
33.     THICKNESS.set(2)
    
34.     COLOR = StringVar()
    
35.     COLOR.set("#ff0000")
    
36. 
    
37.     def paint(event):
    
38.         x1, y1 = (event.x - THICKNESS.get()), (event.y - THICKNESS.get())
    
39.         x2, y2 = (event.x + THICKNESS.get()), (event.y + THICKNESS.get())
    
40.         w.create_oval(x1, y1, x2, y2, fill=COLOR.get())
    
41. 
    
42.     def thickness(tn):
    
43.         THICKNESS.set(tn)
    
44. 
    
45.     def choosecolor():
    
46.         color = colorchooser.askcolor()[1]
    
47.         COLOR.set(color)
    
48. 
    
49.     mb = Menu(root)
    
50. 
    
51.     thmenu = Menu(mb, tearoff=False)
    
52.     thmenu.add_radiobutton(variable=var, value=1, label="细",
    
53.                            command=lambda: thickness(THIN))
    
54.     thmenu.add_radiobutton(variable=var, value=2, label="中",
    
55.                            command=lambda: thickness(MEDIUM))
    
56.     thmenu.add_radiobutton(variable=var, value=3, label="粗",
    
57.                            command=lambda: thickness(THICK))
    
58.     mb.add_cascade(label="调整画笔粗细", menu=thmenu)
    
59.     colormenu = Menu(mb, tearoff=False)
    
60.     colormenu.add_command(label="调整画笔颜色", command=choosecolor)
    
61. 
    
62.     mb.add_cascade(label="选择颜色", menu=colormenu)
    
63. 
    
64.     root.config(menu=mb)
    
65. 
    
66.     w.bind("<B1-Motion>", paint)
    
67.     w.bind("<B3-Motion>", paint)
    
68. 
    
69. 
    
70. btn1 = tkinter.Button(win, text='画布！', bg='green', command=eBtnClickme)
    
71. btn1.pack()
    
72. mainloop()

复制代码

跳转到最佳答案楼层

Twilight6

研究了半天，还是没搞明白为什么在事件里 的THICKNESS 和 COLOR 都是初始值

你可以在你原代码上进行print 测试，会发现打印的一直是2，所以我干脆放弃想了，重新帮你写了下，你看看~

1. # -*- coding:utf-8 -*-
   
2. from tkinter import *
   
3. from tkinter import colorchooser
   
4. import tkinter
   
5. 
   
6. win = tkinter.Tk()
   
7. 
   
8. win.title("简单小部件！")
   
9. win.geometry('250x120+50+10')
   
10. label = tkinter.Label(win, \
    
11.                       text='欢迎来到我的世界！', \
    
12.                       font='宋体', \
    
13.                       fg='#0000ff'
    
14.                       )
    
15. 
    
16. label.pack()
    
17. 
    
18. 
    
19. def eBtnClickme():
    
20.     root = Tk()
    
21.     root.title("画图")
    
22. 
    
23.     var = IntVar()
    
24. 
    
25. 
    
26.     w = Canvas(root, width=1350, height=700)
    
27.     w.pack()
    
28. 
    
29.     THICK = 7
    
30.     THIN = 2
    
31.     MEDIUM = 4
    
32.     THICKNESS = IntVar()
    
33.     THICKNESS.set(2)
    
34.     COLOR = StringVar()
    
35.     COLOR.set("#ff0000")
    
36. 
    
37.     def paint(event):
    
38.         x1, y1 = (event.x - THICKNESS.get()), (event.y - THICKNESS.get())
    
39.         x2, y2 = (event.x + THICKNESS.get()), (event.y + THICKNESS.get())
    
40.         w.create_oval(x1, y1, x2, y2, fill=COLOR.get())
    
41. 
    
42.     def thickness(tn):
    
43.         THICKNESS.set(tn)
    
44. 
    
45.     def choosecolor():
    
46.         color = colorchooser.askcolor()[1]
    
47.         COLOR.set(color)
    
48. 
    
49.     mb = Menu(root)
    
50. 
    
51.     thmenu = Menu(mb, tearoff=False)
    
52.     thmenu.add_radiobutton(variable=var, value=1, label="细",
    
53.                            command=lambda: thickness(THIN))
    
54.     thmenu.add_radiobutton(variable=var, value=2, label="中",
    
55.                            command=lambda: thickness(MEDIUM))
    
56.     thmenu.add_radiobutton(variable=var, value=3, label="粗",
    
57.                            command=lambda: thickness(THICK))
    
58.     mb.add_cascade(label="调整画笔粗细", menu=thmenu)
    
59.     colormenu = Menu(mb, tearoff=False)
    
60.     colormenu.add_command(label="调整画笔颜色", command=choosecolor)
    
61. 
    
62.     mb.add_cascade(label="选择颜色", menu=colormenu)
    
63. 
    
64.     root.config(menu=mb)
    
65. 
    
66.     w.bind("<B1-Motion>", paint)
    
67.     w.bind("<B3-Motion>", paint)
    
68. 
    
69. 
    
70. btn1 = tkinter.Button(win, text='画布！', bg='green', command=eBtnClickme)
    
71. btn1.pack()
    
72. mainloop()

复制代码