mirror of https://github.com/python/cpython
61 lines
1.6 KiB
Python
61 lines
1.6 KiB
Python
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""""Paint program by Dave Michell.
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Subject: tkinter "paint" example
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From: Dave Mitchell <davem@magnet.com>
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To: python-list@cwi.nl
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Date: Fri, 23 Jan 1998 12:18:05 -0500 (EST)
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Not too long ago (last week maybe?) someone posted a request
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for an example of a paint program using Tkinter. Try as I might
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I can't seem to find it in the archive, so i'll just post mine
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here and hope that the person who requested it sees this!
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All this does is put up a canvas and draw a smooth black line
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whenever you have the mouse button down, but hopefully it will
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be enough to start with.. It would be easy enough to add some
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options like other shapes or colors...
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yours,
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dave mitchell
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davem@magnet.com
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"""
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from Tkinter import *
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"""paint.py: not exactly a paint program.. just a smooth line drawing demo."""
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b1 = "up"
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xold, yold = None, None
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def main():
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root = Tk()
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drawing_area = Canvas(root)
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drawing_area.pack()
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drawing_area.bind("<Motion>", motion)
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drawing_area.bind("<ButtonPress-1>", b1down)
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drawing_area.bind("<ButtonRelease-1>", b1up)
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root.mainloop()
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def b1down(event):
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global b1
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b1 = "down" # you only want to draw when the button is down
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# because "Motion" events happen -all the time-
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def b1up(event):
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global b1, xold, yold
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b1 = "up"
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xold = None # reset the line when you let go of the button
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yold = None
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def motion(event):
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if b1 == "down":
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global xold, yold
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if xold != None and yold != None:
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event.widget.create_line(xold,yold,event.x,event.y,smooth=TRUE)
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# here's where you draw it. smooth. neat.
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xold = event.x
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yold = event.y
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if __name__ == "__main__":
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main()
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