​

function setup() {

  createCanvas(400, 400);

  angleMode(DEGREES);

}

​

function draw() {

  background(220);

  beginShape();

  for(let i=0;i<vertices;i++){

    let angle = i*360/vertices

    let x = cos(angle)*100+200;

    let y = sin(angle)*100+200;

    vertex(x,y)

  }

  endShape(CLOSE);

 vertices = (millis()/1000)%12

}