Question

如下图所示，函数1调用另一个函数（draw_text），以便我可以将输出/结果显示在画布中的标签中。这一切都很棒（感谢Stack Overflow !!）

    # Function 1 

    def Relay_1():
       arduinoData.write(b'1')
       draw_text(self,'This is a Test')

    # Function 2

   def Relay_():
       arduinoData.write(b'1')
       draw_text(self,'This is another test number 2')

    #Function 3

    def draw_text(self, text):
         self.canvas.create_text(340,330,anchor = 'center',text = text, font 
         = ('Arial', '10','bold'))

现在我的问题：

如何清除标签的内容＆＃34;已创建，所以每次调用Function 1或2时，画布上的结果都会刷新/更新。目前，短信只是覆盖了自己。

Answer 1

Each time you create an object on a canvas, it returns an identifier. You can pass this identifier to the canvas delete method.

label_id = self.canvas.create_text(...)
...
self.canvas.delete(label_id)

You can also supply one or more tags to an item, and use the tag rather than the id:

self.canvas.create_text(..., tags=('label',))
...
self.canvas.delete('label')

Answer 2

清除画布上的所有项目，以清晰的方式开始。

from Tkinter import ALL
...
self.canvas.delete(ALL)

Answer 3

For complete details

from Tkinter import *


a = Tk()

canvas = Canvas(a, width = 500, height = 500)
canvas.pack()

myrect = canvas.create_rectangle(0,0,100,100)
canvas.delete(myrect) #Deletes the rectangle

删除Tkinter画布文本项的内容

3 个答案: