// algorithm

// if row and column are both even place a dot

// else if row and colum are both odd place a dot

​

let sz;

let nob = 8; // number of balls

let offset;

let theta=0

let szspeed =-5

let acc =2

function setup() {

  createCanvas(800, 800);

  sz = width / nob;

  background(0);

  fill(0);

  noStroke();

  frameRate(2)

  angleMode(DEGREES)

  nob = 40;

  //sz = 5;

  offset = 20;

}

​

function draw() {

  background(255, 255, 0);

  //translate(width/2,height/2)

        sz =5

       // let szspeed = (map(sin(theta),-1,1,-3,3));

      if (szspeed >5 ||szspeed <-5) acc *=-1

  for (let col = 0; col < nob + 1; col += 1) {

      if (sz > 21 || sz <3) szspeed *= -1;

      sz+= szspeed

    for (let row = 0; row < nob + 1; row += 1) {

      // an ellipse every even row and even column

      if (row % 2 == 0 && col % 2 == 0) {

        ellipse(col * offset, row * offset, sz, sz);

      }

      // an ellipse at odd row and odd column

      else if (row % 2 == 1 && col % 2 == 1) {

        ellipse(col * offset, row * offset, sz, sz );

      }

    }

  }

 // theta+=1

 // theta = theta%360

  szspeed+=acc

}

​

function keyPressed() {

   if (key === 'g') {

    saveGif('kusama', 12);

  }

  if (key === 's') {

    saveCanvas('kusama', 'jpg');

  }

}

​

​