learning-picostack
Logo and turtle graphics
What it is
Logo is a programming language. You can use it to write programs that direct the motions of a turtle.
What to do
Visit the Logo Interpreter website.
First program
This is the program, written in English for you to follow:
Type in “forward 100 right 90” (without typing the quotation marks) and press the Enter key.
Use abbreviations: type in “fd 100 rt 90” and press the Enter key.
Do it again (for the third time).
And again (four times in all).
When you have finished looking at the turtle and what it has done, type in “cs” (short for “clearscreen”) and press the Enter key.
Second program
Now, you be the programmer and the turtle will follow your instruction.
Type “repeat 4 [ fd 100 rt 90 ]” and press the Enter key.
When you have finished looking at the turtle and what it has done, type in “cs” (short for “clearscreen”) and press the Enter key.
Third program
Teach the turtle how to draw a square.
Type “to square repeat 4 [ fd 100 rt 90 ] end” and press the Enter key.
You will see nothing happen on the screen. The turtle is just taking this in.
You can see what it knows how to do by clicking on the “Library” link.
There you will see your program, named “square”.
Now the turtle knows how to draw a square.
Fourth program
Instruct the turtle to draw a square.
Type “square” and press the Enter key.
When you have finished looking at the turtle and what it has done, type in “cs” (short for “clearscreen”) and press the Enter key.
Some fun
Type “repeat 5 [ square rt 72 ]” and press the Enter key.
Exercises
- In program one, were you operating the turtle or programming it?
- What about in program three?
- And in program four?
- Play. If you get stuck, ask someone for help.