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authorGuido van Rossum <guido@python.org>1998-01-26 16:47:30 (GMT)
committerGuido van Rossum <guido@python.org>1998-01-26 16:47:30 (GMT)
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tree300298d56a78b79490fd4b572409112572d36aa4 /Demo/tkinter
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Paint demo by Dave Mitchell. There's clearly a demand for such a
demo, so here it is.
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+""""Paint program by Dave Michell.
+
+Subject: tkinter "paint" example
+From: Dave Mitchell <davem@magnet.com>
+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>", motion)
+ drawing_area.bind("<ButtonPress-1>", b1down)
+ drawing_area.bind("<ButtonRelease-1>", 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()