function setup() {

  createCanvas(windowWidth,windowHeight);//making the window the canvas

  background(0);//creating background once

  for(let i=0;i<50;i++){

    ball[i]=new Ball();//creating 50 balls/circles

  }

}

​

function draw() {

  for(let i=0;i<50;i++){

    ball[i].create();//for each ball call the create function in the ball class

    ball[i].center();//for each ball call the center function

  }

}

function mouseClicked(){

  for(let i=0;i<50;i++){

    ball[i].revers();//if the mouse is clicked reverse movment from opposite direction.

  }

}

//interactiveness; can click a key and move around with the mouse to play around.