Python Tkinter Canvas

The Canvas widget in Tkinter is a powerful tool for adding structured graphics to Python applications. It enables users to draw graphs, plots, and various custom shapes, making it essential for developing interactive GUI applications.

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Syntax:

The general syntax to use the Canvas widget is:

w = Canvas(parent, options)

Here, parent represents the parent window or frame where the canvas will be placed, and options define the attributes of the canvas.

Canvas Widget Options:

Below is a list of possible options that can be used with the Canvas widget:

SN	Option	Description
1	bd	Defines the border width. The default value is 2.
2	bg	Specifies the background color of the canvas.
3	confine	Prevents scrolling outside the defined scroll region.
4	cursor	Defines the cursor type (e.g., arrow, circle, dot).
5	height	Sets the height of the canvas.
6	highlightcolor	Defines the highlight color when the widget is focused.
7	relief	Defines the type of border (e.g., SUNKEN, RAISED, GROOVE, RIDGE).
8	scrollregion	Specifies the scrollable area as a tuple (x1, y1, x2, y2).
9	width	Sets the width of the canvas.
10	xscrollincrement	Moves the canvas horizontally in fixed increments.
11	xscrollcommand	Associates a horizontal scrollbar.
12	yscrollincrement	Moves the canvas vertically in fixed increments.
13	yscrollcommand	Associates a vertical scrollbar.

Example 1: Creating a Simple Canvas

The following example creates a basic canvas with a pink background.

from tkinter import *   
  
top = Tk()  
  
top.geometry("200x200")  
  
# Creating a simple canvas  
c = Canvas(top, bg="pink", height=200)  
  
c.pack()  
  
top.mainloop()  

Output:

A pink canvas of size 200×200 appears within the application window.

Example 2: Drawing an Arc on Canvas

The following example demonstrates how to create an arc on the canvas.

from tkinter import *   
  
top = Tk()  
  
top.geometry("200x200")  
  
# Creating a canvas  
c = Canvas(top, bg="pink", height=200, width=200)  
  
arc = c.create_arc((5, 10, 150, 200), start=0, extent=150, fill="white")  
  
c.pack()  
  
top.mainloop()  

Output:

An arc with a white fill appears on the pink canvas.

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Conclusion

The Tkinter Canvas widget is highly versatile, making it easy to add custom drawings, animations, and even game elements to a Python application. By understanding its attributes and how to use them, developers can create visually appealing interfaces with ease.

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