Can you fix it?

Question

the problem is in the createLinearGradien

https://code.sololearn.com/WkaEcj186bRl/?ref=app

Answer 1

thanks.
can you explain me lines 30-32
what do they do and why they made 2 colors on one rect?

https://code.sololearn.com/WY2KN85qAkoT/?ref=app

Answer 2

thank you, i still have couple of questions:
whats the job of the linear gradient in this?
why i need it?
can i do the same code in othet way, without linear gradient?