I want to know how this is expressed. 01

What have you tried? You MUST try to write the code yourself.

You will need a setup() and draw() function. In setup(), you must call size(). Start with that!

Since you will have many dots on the screen, write a Dot class.

Where will a dot be? What color will a dot be? Can you make a dot? Can you draw a dot? Can you have many dots?

https://processing.org/tutorials/objects/

I’m closing this thread, as it’s pretty much a duplicate of this one:

It’s really hard to help with general “how do I do this” type questions. Please try to break your problem down into smaller steps and take those steps on one at a time.

You might also want to read through this guide: