1 """"Paint program by Dave Michell.

     2 

     3 Subject: tkinter "paint" example

     4 From: Dave Mitchell <davem@magnet.com>

     5 To: python-list@cwi.nl

     6 Date: Fri, 23 Jan 1998 12:18:05 -0500 (EST)

     7 

     8   Not too long ago (last week maybe?) someone posted a request

     9 for an example of a paint program using Tkinter. Try as I might

    10 I can't seem to find it in the archive, so i'll just post mine

    11 here and hope that the person who requested it sees this!

    12 

    13   All this does is put up a canvas and draw a smooth black line

    14 whenever you have the mouse button down, but hopefully it will

    15 be enough to start with.. It would be easy enough to add some

    16 options like other shapes or colors...

    17 

    18                                                 yours,

    19                                                 dave mitchell

    20                                                 davem@magnet.com

    21 """

    22 

    23 from Tkinter import *

    24 

    25 """paint.py: not exactly a paint program.. just a smooth line drawing demo."""

    26 

    27 b1 = "up"

    28 xold, yold = None, None

    29 

    30 def main():

    31     root = Tk()

    32     drawing_area = Canvas(root)

    33     drawing_area.pack()

    34     drawing_area.bind("<Motion>", motion)

    35     drawing_area.bind("<ButtonPress-1>", b1down)

    36     drawing_area.bind("<ButtonRelease-1>", b1up)

    37     root.mainloop()

    38 

    39 def b1down(event):

    40     global b1

    41     b1 = "down"           # you only want to draw when the button is down

    42                           # because "Motion" events happen -all the time-

    43 

    44 def b1up(event):

    45     global b1, xold, yold

    46     b1 = "up"

    47     xold = None           # reset the line when you let go of the button

    48     yold = None

    49 

    50 def motion(event):

    51     if b1 == "down":

    52         global xold, yold

    53         if xold is not None and yold is not None:

    54             event.widget.create_line(xold,yold,event.x,event.y,smooth=TRUE)

    55                           # here's where you draw it. smooth. neat.

    56         xold = event.x

    57         yold = event.y

    58 

    59 if __name__ == "__main__":

    60     main()