Python code coverage for Demo/tkinter/guido/paint.py

#	count	content
1	n/a	""""Paint program by Dave Michell.
2	n/a
3	n/a	Subject: tkinter "paint" example
4	n/a	From: Dave Mitchell <davem@magnet.com>
5	n/a	To: python-list@cwi.nl
6	n/a	Date: Fri, 23 Jan 1998 12:18:05 -0500 (EST)
7	n/a
8	n/a	Not too long ago (last week maybe?) someone posted a request
9	n/a	for an example of a paint program using Tkinter. Try as I might
10	n/a	I can't seem to find it in the archive, so i'll just post mine
11	n/a	here and hope that the person who requested it sees this!
12	n/a
13	n/a	All this does is put up a canvas and draw a smooth black line
14	n/a	whenever you have the mouse button down, but hopefully it will
15	n/a	be enough to start with.. It would be easy enough to add some
16	n/a	options like other shapes or colors...
17	n/a
18	n/a	yours,
19	n/a	dave mitchell
20	n/a	davem@magnet.com
21	n/a	"""
22	n/a
23	n/a	from tkinter import *
24	n/a
25	n/a	"""paint.py: not exactly a paint program.. just a smooth line drawing demo."""
26	n/a
27	n/a	b1 = "up"
28	n/a	xold, yold = None, None
29	n/a
30	n/a	def main():
31	n/a	root = Tk()
32	n/a	drawing_area = Canvas(root)
33	n/a	drawing_area.pack()
34	n/a	drawing_area.bind("<Motion>", motion)
35	n/a	drawing_area.bind("<ButtonPress-1>", b1down)
36	n/a	drawing_area.bind("<ButtonRelease-1>", b1up)
37	n/a	root.mainloop()
38	n/a
39	n/a	def b1down(event):
40	n/a	global b1
41	n/a	b1 = "down" # you only want to draw when the button is down
42	n/a	# because "Motion" events happen -all the time-
43	n/a
44	n/a	def b1up(event):
45	n/a	global b1, xold, yold
46	n/a	b1 = "up"
47	n/a	xold = None # reset the line when you let go of the button
48	n/a	yold = None
49	n/a
50	n/a	def motion(event):
51	n/a	if b1 == "down":
52	n/a	global xold, yold
53	n/a	if xold is not None and yold is not None:
54	n/a	event.widget.create_line(xold,yold,event.x,event.y,smooth=TRUE)
55	n/a	# here's where you draw it. smooth. neat.
56	n/a	xold = event.x
57	n/a	yold = event.y
58	n/a
59	n/a	if __name__ == "__main__":
60	n/a	main()