CODEWITHSUNDEEP
pythontkinter
miXo
miXo

Reputation: 313

Tkinter not drawing image to canvas

Tkinter doesn't draw image to canvas from another method.

Example 1 works, example 2 does not work. Can someone please explain why?

example 1

def init_gui(self):
    window = tkinter.Tk()
    self.canvas = tkinter.Canvas(self.window, width=1000, height=500)

    photo = PIL.ImageTk.PhotoImage(image=PIL.Image.fromarray(self.img))
    self.canvas.create_image(0, 0, image=photo, anchor=tkinter.NW)
    self.canvas.pack()

    window.mainloop()
    pass

example 2

def init_gui(self):
    window = tkinter.Tk()
    self.canvas = tkinter.Canvas(self.window, width=1000, height=500)

    self._draw_img() # the exact same code, only in another method

    window.mainloop()
    pass
def _draw_img(self):
    photo = PIL.ImageTk.PhotoImage(image=PIL.Image.fromarray(self.img))
    self.canvas.create_image(0, 0, image=photo, anchor=tkinter.NW)
    self.canvas.pack()
    pass

Upvotes: 2

Views: 1016

Answers (1)

Felix
Felix

Reputation: 6369

If I remember correctly, there's a problem in Tkinter when the image you're displaying goes out of scope (because it's a local variable). Try to make photo an attribute of your class (by replacing photo with self.photo in your _draw_image function) and see if that solves the issue.

Does this help?

Edit

For a more complete explanation, see this website: http://effbot.org/pyfaq/why-do-my-tkinter-images-not-appear.htm

Upvotes: 4

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