balls

let l=[],v=[],s=[];

const NUM =10;

function setup() {

  createCanvas(windowWidth, windowHeight);

  frameRate(60)

  for(let i=0;i<NUM;i++){

    l[i]=createVector(width/2,height/2);

    v[i]=createVector(random(-3,3),random(-3,3));

    s[i]=createVector(20,20);

  }

}

​

function draw() {

  background(0);

  noStroke();

  fill(random(255),random(255),random(255),127);

  for(let i=0;i<NUM;i++){

    ellipse(l[i].x,l[i].y,s[i].x,s[i].y);

    l[i].add(v[i]);

    if(l[i].x>width||l[i].x<0){

      v[i].x=v[i].x*-1;

    }

    if(l[i].y>height||l[i].y<0){

      v[i].y=v[i].y*-1;

    }

    v[i].x+=random(-0.5,0.5);

    v[i].y+=random(-0.5,0.5);

    s[i].x+=random(-1,1);

    s[i].y+=random(-1,1);

  }

}