Python Tkinter – Scale Widget

Tkinter is a GUI toolkit used in python to make user-friendly GUIs.Tkinter is the most commonly used and the most basic GUI framework available in python. Tkinter uses an object-oriented approach to make GUIs.

Note: For more information, refer to Python GUI – tkinter

Scale widget

The Scale widget is used whenever we want to select a specific value from a range of values. It provides a sliding bar through which we can select the values by sliding from left to right or top to bottom depending upon the orientation of our sliding bar.

Syntax:

S = Scale(root, bg, fg, bd, command, orient, from_, to, ..) 

Optional parameters

• root – root window.
• bg – background colour
• fg – foreground colour
• bd – border
• orient – orientation(vertical or horizontal)
• from_ – starting value
• to – ending value
• troughcolor – set colour for trough.
• state – decides if the widget will be responsive or unresponsive.
• sliderlength – decides the length of the slider.
• label – to display label in the widget.
• highlightbackground – the colour of the focus when widget is not focused.
• cursor – The cursor on the widget which could be arrow, circle, dot etc.

Methods

• set(value) – set the value for scale.
• get() – get the value of scale.

Example 1: Creating a horizontal bar

# Python program to demonstrate
# scale widget

from tkinter import *


root = Tk()
root.geometry("400x300")

v1 = DoubleVar()

def show1():

    sel = "Horizontal Scale Value = " + str(v1.get())
    l1.config(text = sel, font =("Courier", 14))


s1 = Scale( root, variable = v1,
           from_ = 1, to = 100,
           orient = HORIZONTAL)

l3 = Label(root, text = "Horizontal Scaler")

b1 = Button(root, text ="Display Horizontal",
            command = show1,
            bg = "yellow")

l1 = Label(root)


s1.pack(anchor = CENTER)
l3.pack()
b1.pack(anchor = CENTER)
l1.pack()

root.mainloop()

Output:

Example 2: Creating a vertical slider

from tkinter import *

root = Tk()
root.geometry("400x300")
v2 = DoubleVar()

def show2():

    sel = "Vertical Scale Value = " + str(v2.get())
    l2.config(text = sel, font =("Courier", 14))

s2 = Scale( root, variable = v2,
           from_ = 50, to = 1,
           orient = VERTICAL)

l4 = Label(root, text = "Vertical Scaler")

b2 = Button(root, text ="Display Vertical",
            command = show2,
            bg = "purple",
            fg = "white")

l2 = Label(root)

s2.pack(anchor = CENTER)
l4.pack()
b2.pack()
l2.pack()

root.mainloop()

Output: