paint with tkinter

Tkinter is a module to build Graphical User Interfaces (GUI). That is desktop software, likely the one you are using right now.

Most desktop software is all about buttons, text fields and that kind of stuff. What about paint? The fun stuff? How do you create a paint window.

In the code below a canvas widget is created, on which you can paint.

An important method is

#!/usr/bin/python3
def test_drag(self,event):
   self.canvas.create_oval(event.x,event.y,event.x+1,event.y+1)

That creates an oval on the mouse position. The +1 means the size. You can change the size, like

#!/usr/bin/python3
def test_drag(self,event):
   self.canvas.create_oval(event.x,event.y,event.x+10,event.y+10)

Ok so what does the code look like?

#!/usr/bin/python3
from tkinter import *

class application(Frame):
    def __init__(self,master):
        super().__init__(master)
        self.master=master
        self.pack()
        self.createWidget()

    def createWidget(self):

        self.canvas = Canvas(
        self,width=200,height=200,bg='white')
        self.canvas.pack()
        self.canvas.bind('<Button-1>',self.mouseTest)
        self.canvas.bind('<B1-Motion>',self.test_drag)
        self.canvas.bind('<KeyPress>',self.keyboard_test)
        self.canvas.bind('<KeyPress-a>',self.press_a_test)
        self.canvas.bind('KeyRelease-a',self.release_a_test)

    def mouseTest(self,event):
        print('{0},{1}'.format(event.x,event.y))
        print('{0},{1}'.format(event.x_root,event.y_root))
        print('{0}'.format(event.widget))

    def test_drag(self,event):
        self.canvas.create_oval(event.x,event.y,event.x+1,event.y+1)

    def keyboard_test(self,event):
        print('keycode:{0},char:{1},keysym:{2}'.format(event.keycode,event.char,event.keysym))

    def press_a_test(self,event):
        print('press a')

    def release_a_test(self):
        print('release a')

if __name__ == '__main__':
    root = Tk()
    root.geometry('200x200')
    app=application(root)
    root.mainloop() 

Enjoy drawing!

Learn more:

• Tkinter tutorial
• Python tutorial
• Tkinter course

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