1""""Paint program by Dave Michell. 2 3Subject: tkinter "paint" example 4From: Dave Mitchell <davem@magnet.com> 5To: python-list@cwi.nl 6Date: Fri, 23 Jan 1998 12:18:05 -0500 (EST) 7 8 Not too long ago (last week maybe?) someone posted a request 9for an example of a paint program using Tkinter. Try as I might 10I can't seem to find it in the archive, so i'll just post mine 11here 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 14whenever you have the mouse button down, but hopefully it will 15be enough to start with.. It would be easy enough to add some 16options like other shapes or colors... 17 18 yours, 19 dave mitchell 20 davem@magnet.com 21""" 22 23from Tkinter import * 24 25"""paint.py: not exactly a paint program.. just a smooth line drawing demo.""" 26 27b1 = "up" 28xold, yold = None, None 29 30def 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 39def 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 44def 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 50def 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 59if __name__ == "__main__": 60 main() 61