From giannicristian at msn.com  Wed Jul 27 12:09:17 2016
From: giannicristian at msn.com (Gianni Iannelli)
Date: Wed, 27 Jul 2016 18:09:17 +0200
Subject: [Tkinter-discuss] Image Canvas delete elements
Message-ID: <DUB117-W99F70168718451905EE81FDA0F0@phx.gbl>

Dear All,
I'm playing a little bit with Tkinter, and I have started playing on Image slider. I would like to create a simple window which change the image based on a simple button. Furthermore, if the 'remove' button is clicked, the actual image is removed and never show up again. I was able to found a very nice working example, but I'm not able to develop the 'remove' button.
I copy and paste a code that I have found on the web:
from Tkinter import *#----------------------------------------------------------------------class MainWindow():    #----------------    def __init__(self, main):        # canvas for image        self.canvas = Canvas(main, width=60, height=60)        self.canvas.grid(row=0, column=0)        # images        self.my_images = []        self.my_images.append(PhotoImage(file = "ball1.gif"))        self.my_images.append(PhotoImage(file = "ball2.gif"))        self.my_images.append(PhotoImage(file = "ball3.gif"))        self.my_image_number = 0        # set first image on canvas        self.image_on_canvas = self.canvas.create_image(0, 0, anchor = NW, image = self.my_images[self.my_image_number])        # button to change image        self.button = Button(main, text="Change", command=self.onButton)        self.button.grid(row=1, column=0)    #----------------    def onButton(self):        # next image        self.my_image_number += 1        # return to first image        if self.my_image_number == len(self.my_images):            self.my_image_number = 0        # change image        self.canvas.itemconfig(self.image_on_canvas, image = self.my_images[self.my_image_number])#----------------------------------------------------------------------root = Tk()MainWindow(root)root.mainloop()
To remove the image, I have added a new button which remove the image. Here it is:
....        self.button_2 = Button(main, text="Change", command=self.onButton_2)        self.button_2.grid(row=2, column=0)
 def onButton_2(self):        #remove image        self.my_images_name.remove(self.my_images_name[self.my_image_number])        # next image        self.my_image_number += 1        # return to first image        if self.my_image_number == len(self.my_images):            self.my_image_number = 0        # change image        self.canvas.itemconfig(self.image_on_canvas, image = self.my_images[self.my_image_number])....
The image is actually removed when I print the list of images but, unfortunately, it keeps appearing on my canvas. I've also tried to remove the canvas and add another one using these code-lines:
...#delete canvasself.canvas.delete(self.image_on_canvas)#add new canvasself.canvas = Canvas( width=60, height=60)self.canvas.grid(row=0, column=0)self.image_on_canvas = self.canvas.create_image(0, 0, anchor = NW, image = self.my_images[self.my_image_number])...
Do you have any idea? I have google it but I was not able to find a solution. I have also tried to update the widget with no success. 
Thanks in advance!GC

 		 	   		  
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From klappnase at web.de  Fri Jul 29 05:01:46 2016
From: klappnase at web.de (Michael Lange)
Date: Fri, 29 Jul 2016 11:01:46 +0200
Subject: [Tkinter-discuss] Image Canvas delete elements
In-Reply-To: <DUB117-W99F70168718451905EE81FDA0F0@phx.gbl>
References: <DUB117-W99F70168718451905EE81FDA0F0@phx.gbl>
Message-ID: <20160729110146.e1784f3c62d771dde93d5d93@web.de>

Hi,

On Wed, 27 Jul 2016 18:09:17 +0200
Gianni Iannelli <giannicristian at msn.com> wrote:

> Dear All,
> I'm playing a little bit with Tkinter, and I have started playing on
> Image slider. I would like to create a simple window which change the
> image based on a simple button. Furthermore, if the 'remove' button is
> clicked, the actual image is removed and never show up again. I was
> able to found a very nice working example, but I'm not able to develop
> the 'remove' button. I copy and paste a code that I have found on the
> web: from Tkinter import
(...)
> # #self.my_image_number = 0        # change image
> # #self.canvas.itemconfig(self.image_on_canvas, image = self.my_images
> # #[self.my_image_number]).... The image is actually removed when I
> # #print the list of images but, unfortunately, it keeps appearing on
> # #my canvas.

If you want to change the currently displayed image, the easiest way
should be to leave the Canvas alone and instead simply configure the
PhotoImage object to use a different image file, as in this primitive
example:

########################################
from Tkinter import *

root = Tk()
c = Canvas(root)
c.pack(fill='both', expand=1)
images = ['a.gif', 'b.gif']
img = PhotoImage(file=images[0])
c.create_image(20, 20, image=img)

def next_img(event):
    current = img.cget('file')
    i = images.index(current)
    if i == len(images) - 1:
        new_i = 0
    else:
        new_i = i + 1
    img.configure(file=images[new_i])

root.bind('<F1>', next_img)

root.mainloop()
########################################

Best regards

Michael	 	   		  


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