Annotate an image in tkinter canvas window dynamically

Question

So I am displaying an image using canvas in my Tkinter window. Now I have a button which calculates certain parameters and I want that to be displayed dynamically over the image. So basically after each calculation, the annotations should change to new parameters.

e.g. Consider that I am calculating column dimensions, and after each calculation, I have to display the dimensions marked on the respective sides of the column image that I have in my Tkinter window.

So is it possible to annotate the image dynamically and if not, is there any other way to perform this task?

Answer 1

Check the below example out

from tkinter import *
from PIL import Image,ImageTk
import random

def annotate():
    annotation=str(random.randint(1000,9999))
    canvas.itemconfig(annotation_text,text=annotation)

root=Tk()

canvas=Canvas(root)
canvas.pack(fill='both',expand=True)

image=Image.open('example.png')
image=ImageTk.PhotoImage(image.resize((300,300)))
canvas.create_image(150,150,image=image)

annotation_text=canvas.create_text(50,50,text='')

button=Button(root,text='Annotate',command=annotate)
button.pack()

root.mainloop()

You can make use of the itemconfig method to configure the text. The above example will annotate the image at (50,50) with a random integer on click of a button.