Basic Graphics #3 - Angle

Using  -  The Python Computer Language

                Turtle Graphics Library

3.   ANGLE

ROTATION RIGHT

 

 

SAVE AS

 

>>> import turtle

>>>

>>> Pt = turtle.Turtle()

>>>

>>> Pt.right(45)

>>>

>>> turtle.done()

>>> 

 

SAVE

 

 

Pt.right(number of degrees)

    Arrow head turns around to its right     

    side   

 

The arrow head spins at its position,

    which is the pixel at its front point

ROTATION LEFT

 

SAVE AS

 

>>> import turtle

>>>

>>> Pt = turtle.Turtle()

>>>

>>> Pt.left(45)

>>>

>>> turtle.done()

>>> 

 

SAVE

 

 

Pt.left(number of degrees)

    Arrow head turns around to its left side

     

The arrow head spins at its position, 

    which is the pixel at its front point

ROTATED LINE

 

 

SAVE AS

 

>>> import turtle

>>>

>>> Pt = turtle.Turtle()

>>>

>>> Pt.right(120)

>>> Pt.forward(200)

>>>

>>> turtle.done()

>>> 

 

SAVE

 

Pt.right(number of degrees)

Pt.forward(number of pixels)

            x 1

ANGLE

 

 

SAVE AS

 

>>> import turtle

>>>

>>> Pt = turtle.Turtle()

>>>

>>> Pt.right(120)

>>> Pt.forward(200)

>>> Pt.right(120)

>>> Pt.forward(200)

>>>

>>> turtle.done()

>>> 

 

SAVE

 

Pt.right(number of degrees)

Pt.forward(number of pixels)

            x 2

TRIANGLE

 

SAVE AS

 

>>> import turtle

>>>

>>> Pt = turtle.Turtle()

>>>

>>> Pt.right(120)

>>> Pt.forward(200)

>>> Pt.right(120)

>>> Pt.forward(200)

>>> Pt.right(120)

>>> Pt.forward(200)

>>>

>>> turtle.done()

>>>

 

SAVE

Pt.right(number of degrees)

Pt.forward(number of pixels)

            x 3

USING THE OUTSIDE ANGLE

Pt.forward(number of pixels)

Pt.right(number of degrees)

    the line proceeds in the direction,

      - of, number of degrees, right,

      - from, the previous direction

         of the arrow

THE LOOP

 

 

When there is a repetition of

a sequence of actions,

instead of writing out the sequence,

a number of times,

it is easier to write it as a loop.

 

So,

 

Pt.right(120)

Pt.forward(200)

Pt.right(120)

Pt.forward(200)

 

Can be written, as the “for” loop  -

 

for i in range(2):

    Pt.right(120)

    Pt.forward(200)

 

i   means “integer”, “whole number”

  

Also,

 

Pt.right(120)

Pt.forward(200)

Pt.right(120)

Pt.forward(200)

Pt.right(120)

Pt.forward(200)

 

Can be written, as the “for” loop  -

 

for i in range(3):

    Pt.right(120)

    Pt.forward(200)

 

for i in range(number of times):

     sequence of actions

    number of times,

    is the number of times to do (loop)

    this sequence of actions 

(c) Katherine Stuart 2020

Dochas Books Film

Basic Graphics #2 - Line

Using  -  The Python Computer Language
                Turtle Graphics Library

2.  LINE

FORWARD LINE

SAVE AS

 

>>> import turtle

>>>

>>> Pt = turtle.Turtle()

>>>

>>> Pt.forward(200)

>>>

>>> turtle.done()

>>> 

 

SAVE

 

Pt.forward(number of pixels)

    in the direction of the arrow head      ↑

 

This line is  1  pixel wide

The length of the line is from the start    

    pixel to the pixel at the front point of 

    the arrow head

 

 

BACKWARD LINE

SAVE AS

 

>>> import turtle

>>>

>>> Pt = turtle.Turtle()

>>>

>>> Pt.backward(200)

>>>

>>> turtle.done()

>>> 

 

SAVE

Pt.backward(number of pixels)                                 

    in the opposite direction of the

    arrow head                                               ↑

                                                                      ↓

This line is  1  pixel wide

The length of this line is from the start 

    pixel, to the pixel at the front point of

    the arrow head

 

 

 

FORWARD & BACKWARD LINE

 

SAVE AS

 

>>> import turtle

>>>

>>> Pt = turtle.Turtle()

>>>

>>> Pt.forward(200)

>>> Pt.backward(200)

>>>

>>> turtle.done()

>>> 

 

SAVE

Pt.forward(number of pixels)

    in the direction of the arrow head      ↑

 

Pt.backward(number of pixels)                                 

    in the opposite direction of the

    arrow head                                            ↑

                                                                      ↓

 

 

LINE WIDTH

SAVE AS

 

>>> import turtle

>>>

>>> Pt = turtle.Turtle()

>>>

>>> Pt.width(10)

>>> Pt.forward(200)

>>>

>>> turtle.done()

>>> 

SAVE

 

Pt.width(number of pixels)

 

This line is 10 pixels wide

(c) Katherine Stuart 2020

Dochas Books Film 

Poem - "The Net"

 

The Net

For Friedrick

Twirling, twirling,

Round and round,

Circle spinning, 

Off the ground.

Through the air,

Nature abound,

Through the forest,

Whistling sound.

Where it lands,

I can only hope,

A bird or two,

In it's scope.

But yet, dismay,

Can it cope?

"Any luck?"

I answer, "Nope."

But that was then,

I was a child,

My brother tried,

My efforts, mild.

*

Things come to pass,

And this is now,

No longer child,

I may know how.

Throwing wide,

From pole to pole,

Deeper than ............ ,

My soul.

A hidden net,

High in the sky,

To catch a bird ............ ,

'Tis nigh.

(c) Katherine Stuart 2020

Dochas Books Film

Basic Graphics #1 - Point (and Screen)

 Using  -  The Python Computer Language  
                 Turtle Graphics Library

I have been working on a few computer programs

so that I can do some graphics for different projects.

The programs are very simple, 

and anyone who wants to start from scratch

to write computer programs, or do some graphics,

may find these useful.

                 

1.  POINT    (AND SCREEN)

 

SAVE AS

>>> import turtle             ENTER
>>>                           ENTER
>>> Pt = turtle.Turtle()      ENTER
>>>                           ENTER
>>> turtle.done()             ENTER
>>> 

SAVE
 

Pt is –

            At the default start position

            At the centre of screen

            At    0    The Origin

The curved side of the arrow head is the  
    back
The pixel at the front point of the arrow
    head, is its position

TO SET PYTHON UP ON YOUR COMPUTER
-    go to    https://www.python.org/downloads/
-    download the latest version of Python for your type of system
-    follow the prompts to install it on your system
Mine is Windows 10, so in Windows 10 -
-    access it by clicking on the "start" button on your task bar
     -    scroll down the program list until you get to "Python"
          -    click on "Python", and 4 items will appear       
               -    IDLE    - this is the file that you write programs in
               -    Python    - this is the file that you run your programs in
               -    Python Manuals    - information on how to use Python
               -    Python Module Docs    - lists of programs within Python
          -    click on IDLE
               -    the IDLE file will come up
               -    Save your file using the drop down menu "file" at the top,
                     following the prompts, into a folder
               -    type your program in this file
               -    when you type in -    xxxx = turtle.Turtle() 
                     a basic window with an arrow head in it will appear behind your IDLE file
               -    move the window to the side of your IDLE file so that you can see it
               -    finish typing in your program
               -    Save your program
-    click on the "start" button on your task bar
     -    scroll down to, then click on, "Snip and Sketch"
          -    take a "Snip and Sketch" of  your finished window
               and save it into a folder
The images above are "Snip and Sketch"

PROGRAMS
The program above, and the ones following in other posts,
are my ideas, from the video below that I've been learning from.
:)

At -   https://www.youtube.com/watch?v=pxKu2pQ7ILo 

HAPPY COMPUTER PROGRAMMING  :)

Black Framed Images, and Text (c) Katherine Stuart 2020

Dochas Books Film