Basic Graphics #4 - Square

Using - The Python Computer Language

              Turtle Graphics Library

4.  SQUARE

SAVE AS
 
>>> import turtle
>>>
>>> Pt = turtle.Turtle()
>>>
>>> for i in range(4):
        Pt.forward(200)
        Pt.right(90)
 
    
>>>
>>> turtle.done()
>>> 
 
SAVE

For i in range(4):
    Pt.forward(number of pixels)
    Pt.right(90)
    A square always has 
      -    4  equal sides
      -    90  degree angles
 
 

A LOOP WITHIN A LOOP
 
 
Something which is made by a loop,
can be copied in another position,
numerous times by another loop.
 
for i in range(number of times):            ENTER

    for i in range(number of times):        ENTER
         
          Pt.forward(number of pixels)      ENTER   
          Pt.right(90)                      ENTER, BACKSPACE ONCE
    Pt.right(90)                            ENTER
 
 
The loop, inside, makes the square –
    

    for i in range(number of times):          
          Pt.forward(number of pixels)        
          Pt.right(90)

 
The loop, outside, makes copies, a number of times –
for i in range(number of times):
 
        This changes the start angle for the next square, a further 90 degrees each time –
        Pt.right(90)                          
         

                    
TWO SQUARES

 
SAVE AS
 
>>> import turtle
>>> 
>>> Pt = turtle.Turtle()
>>> 
>>> for i in range(2):
         for i in range(4):
              Pt.forward(200)
              Pt.right(90)
         Pt.right(90)
 
 
>>> turtle.done()
>>> 
 
SAVE

THREE SQUARES

SAVE AS

 

>>> import turtle

>>>

>>> Pt = turtle.Turtle()

>>> 

>>> for i in range(3):

     for i in range(4):

          Pt.forward(200)

          Pt.right(90)

     Pt.right(90)

 

 

>>> 

>>> turtle.done()

>>>

SAVE

FOUR SQUARES

 

SAVE AS

 

>>> import turtle

>>>

>>> Pt = turtle.Turtle()

>>>

>>> for i in range(4):

     for i in range(4):

          Pt.forward(200)

          Pt.right(90)

     Pt.right(90)

 

    

>>>

>>> turtle.done()

>>>

SAVE

Four Squares -

For i in range(4):

    For i in range(4):

        Pt.forward(number of             pixels)

        Pt.right(90)

    Pt.right(90)

THE FOUR QUADRANTS

In this arrangement  -

Each square is called a  quadrant.

"Quad"    means     "four".

The quadrant is the space,

also known as the "area".

This is how I have numbered them.

0    is the    "Origin".

THE GRID

If we look at the lines,

each square has equal sides,

and all the squares are the same.

We can say that each side is

1 “unit”, or amount.

Then, we can say,

all the horizontal lines are    X

and,

all the vertical lines are    Y

We can also say,

that    X    to the right of    0,

And    Y    above    0,

have positive    “+”    numbers,

adding to    0.

And,

that    X    to the left of    0,

and    Y    below    0,

have negative    “-“    numbers,

taking away from    0.

POINTS ON THE GRID

Where the lines meet,

we can call those “points”.

0    The Origin, is a point.

We can say,

0    The Origin, is at,

x  =  0    and,

y  =  0

We can write its position as,

    (0,0)  

For any point on the grid,

we can write its position as,

    (x,y)  

(c) Katherine Stuart 2020

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