Project 3: Processing - Clickable Buttons

Secong assignment to make some clickable buttons: 

"Using the interactive stripes as an example, I want you to create a Button object. It can be rectangular or circular, it's up to you. Then I want you to make an array of the buttons. They should move around the screen and when they reach the edges, they either bounce off or loop around to the other side of the screen. When you click on a button, it changes colour. When you click it again it reverts to its original colour. You have until the end of Tuesday 10th January."

Here are my buttons: