| """"Paint program by Dave Michell. |
| |
| Subject: tkinter "paint" example |
| From: Dave Mitchell <[email protected]> |
| To: [email protected] |
| 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 |
| [email protected] |
| """ |
| |
| 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 is not None and yold is not 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() |
