Menu
I want to change the canvas size after I have added some widgets to it
Example:
from Tkinter import *
master = Tk()
w = Canvas(master, width=100, height=100)
w.config(bg='white')
w.create_oval(90,90,110,110, width=0, fill = "ivory3")
w = Canvas(master, width=200, height=200)
w.pack()
mainloop()
But it seem that when I re-declare the canvas size, the objects get removed. Is it possible to update the canvas after I have created some objects on it?
471
A Frame is designed to be a parent container of other widgets. A Canvas is like a canvas that you can draw somethings on it like lines, circles, text, etc. A Canvas can be used as a parent container as well but it is not designed for that at the first place.
Build A Paint Program With TKinter and Python We can add a button to trigger the event which when pressed will change the canvas image. To change a particular image, we can configure the canvas by using the itemconfig() constructor. It takes image files which need to be updated and displayed them on the window.
c.bbox(item) Returns an approximate bounding box for item, a tuple of four integers: the pixel coordinates of minimum x, minimum y, maximum x, maximum y, in this order.
Practical Data Science using Python The Canvas is a rectangular area intended for drawing pictures or other complex layouts. You can place graphics, text, widgets or frames on a Canvas.
What you are looking for is the configure option, as is documentered here. Basically, something like this should help, in place of creating a new canvas:
w.config(width=200, height=200)
For reference, the reason why everything got deleted off of the Canvas is because you created a brand new Canvas, with a different size and the same name. If you are going to change properties of an existing object, you must change the existing object, and not overwrite it. Basically you overwrite something if you declare it equal to something else (w=Canvas(...)).
103
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
