How To Use Canvas In Tkinter In Python

Introduction

 

In this article, I will explain how to use canvas in Tkinter in Python.

 

Definition

 

The Canvas keyword is used to draw and do layout in a Python application. The Canvas is a square area intended for pictures or complex layouts. You can place graphics and text on the Canvas keyword. When you call the canvas function the first letter must be a capital letter.

 

Syntax

c=Canvas (a, option=cost) //first letter must be capital letter.

Parameters

 

a − This represents the parent window of the computer.

 

option − The list of most used options for this widget.

 

Option & Description

• bd- The Border is used to change the width in pixels. Default pixels value is 2.
• bg - The background is used to change Normal background color background.
• fg - The fg is used to change the normal foreground (text) color.
• font - The font is used to change the text font to be used for the button's label.
• height - The height is used to change the height of the button in text lines (text buttons) or pixels (images).
• relief-Relief is used to specify the type of the border. The values are SUNKEN, RAISED, GROOVE, and RIDGE.

Example

 

line − line keyword is used to create a line item.

line =create_line(x0, y0, x1, y1)

Simple Program

from tkinter import *
a=Tk()
c = Canvas(root, scrollregion=(0,0,500,500), height=200, width=200)
c.pack()
c.create_line(0,0,600,500,width=5,fill="red",dash=(3,3))
c.create_line(0,500,600,0,width=5,fill="green",dash=(3,3))
a.mainloop()

Output

 

 

Example

 

arc −arc keyword is used to create an arc item, you want to specify some value in the arc function.

arc = create_arc(coord, start=0, extent=180, fill="red")

oval −oval keyword is used to create a circle at the given coordinates. It will take two coordinates, the top left and bottom right corners.

oval = canvas.create_oval(x0, y0, x1, y1, options)

Program

from tkinter import *
a=Tk()
c=Canvas(a,width=600,height=500)
c.pack()
c.create_oval(100,100,300,300,width=7,fill="red")
c.create_arc(100,100,300,300,start=0,extent=100,width=7,fill="yellow")
a.mainloop()

Output

 

• Scroll region-The scroll region is used to tuple (w, n, e, s) that defines over how large the canvas can be scrolled; for example west =left side, north = top, east = right side, and south = bottom.
• xscrollincrement-The xscrollincrement is moved in a horizontal direction.
• yscrollincrement-The yscrollincrement is moved in a vertical direction.
• xscrollcommand- The xscrollcommand keyword used for the canvas is scrollable, this attribute must be the. set () method of the horizontal scrollbar.
• yscrollcommand- The yscrollcommand keyword used for the canvas is scrollable, this attribute must be the. set () method of the vertical scrollbar.

Program

from tkinter import *
a=Tk()
a.title("list and scrollbar")
list1=Listbox(a,width=25,height=25,justify=CENTER,bg="pink",bd=20)
scroll=Scrollbar(a,command=list1.yview)

list1.configure(yscrollcommand=scroll.set)
list1.pack(side=LEFT)
scroll.pack(side=RIGHT,fill=Y)
for q in range(500):
    list1.insert(END,q)

Output

 

 

Conclusion

 

In this article, we have seen how to use canvas in Tkinter in Python. I hope this article was useful to you. Thanks for reading!