小诺爷 发表于 2020-6-9 12:08:27

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

# -*- 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()
    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()

Twilight6 发表于 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~

# -*- 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()


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

    THICK = 7
    THIN = 2
    MEDIUM = 4
    THICKNESS = IntVar()
    THICKNESS.set(2)
    COLOR = StringVar()
    COLOR.set("#ff0000")

    def paint(event):
      x1, y1 = (event.x - THICKNESS.get()), (event.y - THICKNESS.get())
      x2, y2 = (event.x + THICKNESS.get()), (event.y + THICKNESS.get())
      w.create_oval(x1, y1, x2, y2, fill=COLOR.get())

    def thickness(tn):
      THICKNESS.set(tn)

    def choosecolor():
      color = colorchooser.askcolor()
      COLOR.set(color)

    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()
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