Did you know that CoCube's screen can hide an invisible turtle? Once you learn its language, it can draw all kinds of geometric art on the screen.

1. Preparation: Learn the Turtle's Canvas

CoCube's screen is made of 240 x 240 color pixels.

• Screen coordinates: the top-left corner is (0, 0), and the center of the screen, (120, 120), is the turtle's default home.

• Before running a drawing program, remember to send the turtle home first.

Open the drawing toolbox

In MicroBlocks, click Add Library, then choose Graphics and Displays -> Turtle to add the library.

These are the main commands:

• home: move the turtle to the center of the screen and point it to the right.
• move _: move the turtle forward in the direction it is facing.
• turn x degrees: change the turtle's direction. Turning right uses a positive value, and turning left uses a negative value.
• turn _ / _ of circle: this is an easier way to think about rotations, such as half a turn or 1/4 turn.
• clear display: erase the turtle's drawing and get ready for a new one.
• pen down and pen up: the turtle only leaves a trail when the pen is down.

2. Basic Drawing: Start with Simple Shapes

Step 1: Draw a square

A square has 4 sides. After drawing each side, the turtle turns 90 degrees.

Step 2: Draw a regular pentagon and hexagon

To draw a pentagon or hexagon, change the number of loop repeats and the turning angle.

For a regular polygon with n sides, the turtle turns 360 degrees / n each time.

• Regular pentagon: turn 72 degrees, or turn 1/5 of a full turn.
• Regular hexagon: turn 60 degrees, or turn 1/6 of a full turn.

3. More Drawing Ideas

Example A: Rotating squares

What happens if the turtle draws a square, turns a little, and then draws the next square?

You will get a beautiful layered pattern.

Example B: Right-angle maze

What if the turtle moves like it is walking through a maze, turning 90 degrees each time, while each move gets a little longer?

Example C: A 91-degree maze?

What happens if you change 90 degrees to 91 degrees?

The small change makes the shape slowly rotate and spread out in an interesting way.

Example D: Make it loop

What happens if the turning angle changes from 0 degrees to 180 degrees?

The lines can fold and twist into a kaleidoscope-like pattern.

4. Challenge and Create

• Color challenge: add a set pen color to block inside the loop and turn your geometry into a rainbow.
• Extreme angles: try unusual angles, such as 144 degrees, 160 degrees, or 170 degrees, and see what patterns appear.