Basic Graphics #5 - Diagonal

Using  -  The Python Computer Language

                Turtle Graphics Library

5.  DIAGONAL

SAVE AS

 

>>> import turtle

>>>

>>> Pt = turtle.Turtle()

>>>

>>> for i in range(4):

        Pt.forward(200)

        Pt.right(90)

 

    

>>> Pt.right(45)

>>>

>>> Pt.goto(200, -200)

>>>

>>> turtle.done()

>>> 

SAVE

 

Pt.goto(x,y)

    Enables Pt to go to  (x , y)  on the grid

DEFINING A PROCESS

 

 

We can combine a number of actions into one process,

to make it easier to repeat them a number of times.

 

This is called    “Defining”    a process.

 

So, this combination of actions –

for i in range(4):

     Pt.forward(200)

     Pt.right(90)

 

Can be defined as,

def square():

            for i in range(4):

          Pt.forward(200)

          Pt.right(90)

 

To define any process –

def name():

     actions

Definitions are descriptions,

and need to be written into the program,

before they need to be used,

so that the computer understands them.

 

 

When needing to use a defined process,

type in –

 

name()

 

 

THE STAR

 

SAVE AS

>>> import turtle

>>>

>>> Pt = turtle.Turtle()

>>>

>>> def square():

       for i in range(4):

           Pt.forward(200)

           Pt.right(90)

 

         

>>> square()

>>> Pt.right(45)

>>> Pt.goto(200,-200)

>>> Pt.goto(0,0)

>>> Pt.right(45)

>>>

>>> square()

>>> Pt.right(45)

>>> Pt.goto(-200,-200)

>>> Pt.goto(0,0)

>>> Pt.right(45)

>>> 

>>> square()

>>> Pt.right(45)

>>> Pt.goto(-200,200)

>>> Pt.goto(0,0)

>>> Pt.right(45)

>>>

>>> square()

>>> Pt.right(45)

>>> Pt.goto(200,200)

>>> Pt.goto(0,0)

>>> Pt.right(45)

>>>

>>> turtle.done()

SAVE

(c) Katherine Stuart 2020

Dochas Books Film