createCanvas(windowWidth, windowHeight);

}

​

let periodSec = 1;

​

function draw() {

  background(220, 20, 120);

​

  let amplitude = width / 2;

  let xOffset = width / 4;

​

  let period = periodSec * getTargetFrameRate();

​

  let floorTerm = floor(frameCount / period + 0.5);

  let absTerm = abs(frameCount / period - floorTerm);

​

  let x = 2 * absTerm * amplitude;

  let y = height / 2;

​

  ellipse(x + xOffset, y, 25);

}

​