import tkinter as tk


CENTER=tk.CENTER
NW=tk.NW

root=tk.Tk()

canvas1 = tk.Canvas(root, width = 450, height = 500)
canvas1.pack()

#Function to be called when button is clicked
def getImage(t_entry):
    if(t_entry.get().lower()=="Hello"):          
       photo=tk.PhotoImage(file="C:\\Users\Alpha\PycharmProjects\Challenge1\Assets\Image2.jpg")
       canvas1.create_image(225,210, anchor=NW, image=photo)
    elif(t_entry.get().lower()=="My Name is"):
       photo=PhotoImage(file="C:\\Users\Alpha\PycharmProjects\Challenge1\Assets\Image1.png")
       canvas1.create_image(225,210, anchor=NW, image=photo)

label1 = tk.Label(root, text='Text to Sign Language Interpretation')
label1.place(relx=.5,rely=.5,anchor=CENTER)
label1.config(font=('helvetica', 14))
canvas1.create_window(225, 25, window=label1)

label2 = tk.Label(root, text='Type Your Text:')
label2.place(relx=.5,rely=.5,anchor=CENTER)
label2.config(font=('helvetica', 14))
canvas1.create_window(225, 100, window=label2)

#Entry for user to enter text they want displayed in sign langauage
entry1 = tk.Entry (root)
canvas1.create_window(225, 140, window=entry1)

#Button that Displays Sign Language Image
button1 = tk.Button(text='Show Sign Language', command=getImage(entry1), bg='grey', fg='white', font=('helvetica', 9, 'bold'))
canvas1.create_window(225, 190,anchor=CENTER, window=button1)


root.mainloop()

The application displays a sign language image when a user enters text assigned to that image. E.g if the user enters "Hello", it displays an image of "hello" in sign language.

CodePudding user response：

There are few issues in your code:

1. command=getImage(entry1) will execute getImage() immediately, not on button click. Use command=lambda: getImage(entry1) instead

2. t_entry.get().lower()=="Hello" will always be False as the left side is all lowercase, but the right side is not. Same on t_entry.get().lower()=="My Name is". Suggest to change the right side to all lowercase as well.

3. image will be garbage collected as described in this question. You can make photo a global variable to fix it.

4. you have create new image item whenever getImage() is executed. Better create the image item once and update its image inside the function.

Below is the changed code required to fix the above issues:

...
def getImage(t_entry):
    global photo  # avoid garbage collection by using global variable

    if t_entry.get().lower() == "hello": # changed to all lowercase
       photo = tk.PhotoImage(file="C:\\Users\Alpha\PycharmProjects\Challenge1\Assets\Image2.jpg")
       canvas1.itemconfigure(image_id, image=photo) # update image item
    elif t_entry.get().lower() == "my name is": # change to all lowercase
       photo = PhotoImage(file="C:\\Users\Alpha\PycharmProjects\Challenge1\Assets\Image1.png")
       canvas1.itemconfigure(image_id, image=photo) # update image item
    else:
       # clear the image if text cannot be matched to an image
       canvas1.itemconfigure(image_id, image='')

...
# used command=lambda: getImage(entry)
button1 = tk.Button(text='Show Sign Language', command=lambda: getImage(entry1), bg='grey', fg='white', font=('helvetica', 9, 'bold'))
canvas1.create_window(225, 190, anchor=CENTER, window=button1)

# create the image item initially without a image
image_id = canvas1.create_image(225, 210, anchor=NW)

root.mainloop()