createCanvas(windowWidth, windowHeight);

  background(220);

}

​

function draw() {

  noFill();

  ellipse(mouseX, mouseY, 55, 55);

  stroke(50, 50);

  strokeWeight(.5);

}

​

function keyTyped() {

  if (key === "s") {

    saveFrames("circle trace", "png", 1, 1);

​

  }

}

​