millis

var timeInterval;

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  background(255);

  frameRate(60);

  strokeWeight(20);

  lastTimeCheck = millis();

  timeInterval = 2000;

}

​

function strokeChange(){

  if (millis() > lastTimeCheck + timeInterval){

    lastTimeCheck = millis();

    stroke(random(255), random(255), random(255));

  }

​

}

​

function draw() {

  strokeChange();

  noFill();

  var x = width/2

  ellipse(x, height/2, 100, 100);

  noStroke();

  fill(255, 0, 120);

  ellipse(mouseX, mouseY, 40, 40);

}