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Python program to draw a bar chart using turtle
  • Last Updated : 23 Apr, 2021

Prerequisite: Turtle Programming Basics

Turtle is a Python feature like a drawing board, which lets us command a turtle to draw all over it! We can use functions like a turtle.forward(…) and turtle.right(…) which can move the turtle around. Turtle is a beginner-friendly way to learn Python by running some basic commands and viewing the turtle do it graphically. It is like a drawing board that allows you to draw over it. The turtle module can be used in both object-oriented and procedure-oriented ways.

To draw, Python turtle provides many functions and methods i.e. forward, backward, etc. Some commonly used methods are:

  • forward(x): moves the pen in the forward direction by x unit.
  • backward(x): moves the pen in the backward direction by x unit.
  • right(x): rotate the pen in the clockwise direction by an angle x.
  • left(x): rotate the pen in the anticlockwise direction by an angle x.
  • penup(): stop drawing of the turtle pen.
  • pendown(): start drawing of the turtle pen.

Turtle can be used to draw any static shape (Shape that can be drawn using lines). We all know that

Approach:



  • Import the turtle library.
  • Create a function, say drawBar() that takes a turtle object, a height value, and a color name and perform the following steps:
    • The function draws vertical rectangles of a given height and fixed width (say 40).
    • The function fills the rectangle with the given color name.
  • Initialize a list having some numerical values (data for the bar graph).
  • Initialize a turtle instance.
  • Set up the window and call the drawBar() for each value of the list with the created turtle instance and any color of your choice.
  • After completing the above steps, close the turtle instance.

Below is the implementation of the above approach:

Python3




# Python program to draw a turtle
import turtle
  
# Function that draws the turtle
def drawBar(t, height, color):
    
    # Get turtle t to draw one bar
    # of height
       
    # Start filling this shape
    t.fillcolor(color)
    t.begin_fill()              
    t.left(90)
    t.forward(height)
    t.write(str(height))
    t.right(90)
    t.forward(40)
    t.right(90)
    t.forward(height)
    t.left(90)
       
    # stop filling the shape
    t.end_fill()                 
  
# Driver Code
  
xs = [48, 117, 200, 96, 134, 260, 99]
clrs = ["green", "red", "yellow", "black",
        "pink", "brown", "blue"]
  
maxheight = max(xs)
numbars = len(xs)
border = 10
   
# Set up the window and its
# attributes
wn = turtle.Screen()             
wn.setworldcoordinates(0 - border, 0 - border, 
                       40 * numbars + border,
                       maxheight + border)
   
# Create tess and set some attributes
tess = turtle.Turtle()           
tess.pensize(3)
   
for i in range(len(xs)):
      
    drawBar (tess, xs[i],
             clrs[i])
  
wn.exitonclick()

Output:

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