Python program to draw a bar chart using turtle
Last Updated :
02 Dec, 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
import turtle
def drawBar(t, height, color):
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 )
t.end_fill()
xs = [ 48 , 117 , 200 , 96 , 134 , 260 , 99 ]
clrs = [ "green" , "red" , "yellow" , "black" ,
"pink" , "brown" , "blue" ]
maxheight = max (xs)
numbers = len (xs)
border = 10
wn = turtle.Screen()
wn.setworldcoordinates( 0 - border, 0 - border,
40 * numbers + border,
maxheight + border)
tess = turtle.Turtle()
tess.pensize( 3 )
for i in range ( len (xs)):
drawBar (tess, xs[i],
clrs[i])
wn.exitonclick()
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Output:
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