""""Paint program by Dave Michell. Subject: tkinter "paint" example From: Dave Mitchell To: python-list@cwi.nl Date: Fri, 23 Jan 1998 12:18:05 -0500 (EST) Not too long ago (last week maybe?) someone posted a request for an example of a paint program using Tkinter. Try as I might I can't seem to find it in the archive, so i'll just post mine here and hope that the person who requested it sees this! All this does is put up a canvas and draw a smooth black line whenever you have the mouse button down, but hopefully it will be enough to start with.. It would be easy enough to add some options like other shapes or colors... yours, dave mitchell davem@magnet.com """ from Tkinter import * """paint.py: not exactly a paint program.. just a smooth line drawing demo.""" b1 = "up" xold, yold = None, None def main(): root = Tk() drawing_area = Canvas(root) drawing_area.pack() drawing_area.bind("", motion) drawing_area.bind("", b1down) drawing_area.bind("", b1up) root.mainloop() def b1down(event): global b1 b1 = "down" # you only want to draw when the button is down # because "Motion" events happen -all the time- def b1up(event): global b1, xold, yold b1 = "up" xold = None # reset the line when you let go of the button yold = None def motion(event): if b1 == "down": global xold, yold if xold != None and yold != None: event.widget.create_line(xold,yold,event.x,event.y,smooth=TRUE) # here's where you draw it. smooth. neat. xold = event.x yold = event.y if __name__ == "__main__": main()
