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Day 10: Turtle

Starting Turtle Library

At first we have to import turtle library. In order to import turtle library we will simply use import turtle.

import turtle
sandeep = turtle.Turtle()
# Write your code here 
sandeep.forward(100)
# In the end we have to write 
turtle.done()

The program creates a turtle named sandeep. It starts with the origin and moves toward the right . The image looks as follows

img

So basically turtle traces a path according to given instruction.

Similar to forward, we can use the following functions to control our drawing according to the name.

  • Forward: used as sandeep.forward(100) to move in forward direction.
  • Backward: used as sandeep.backward(100) to move in backward direction.
  • Left: used as sandeep.left(60) to turn towards left.
  • Right: used as sandeep.right(60) to turn towards right.

We can directly go to a specified coordinate using goto function as sandeep.goto(100, 100)

1. Creating a Square

We can use these basic knowledge to draw a square as follows. 

import turtle
sandeep = turtle.Turtle()
# Write your code here 
sandeep.forward(100)
sandeep.left(90)
sandeep.forward(100)
sandeep.left(90)
sandeep.forward(100)
sandeep.left(90)
sandeep.forward(100)
# In the end we have to write 
turtle.done()

img2

We can see that there is a loop in the program, so we can use loop to make it short. 

import turtle
sandeep = turtle.Turtle()
# Write your code here 
for i in range(4):
    sandeep.forward(100)
    sandeep.left(90)
# In the end we have to write 
turtle.done()

Now we can use function to create a square and then use that function to create more complicated shapes based on square. 

import turtle
sandeep = turtle.Turtle()
# Write your code here 
def square():
    for i in range(4):
        sandeep.forward(100)
        sandeep.left(90)

for i in range (18):
    square()
    sandeep.left(20)
# In the end we have to write 
cv = turtle.getcanvas()
cv.postscript(file="file_name.ps", colormode='color')
turtle.done()

img3

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