function setup() {

  createCanvas(400, 400);

  ocanvas = document.createElement("canvas");

  ocanvas.width = width;

  ocanvas.height = height;

  //get the drawing context of the render canvas

  octx = ocanvas.getContext("2d");

  octx.beginPath();

  octx.arc(width / 2, height / 2, 64, Math.PI * 2, false);

  octx.closePath();

  octx.fillStyle = 'rgba(255, 0, 255, 1)';

  octx.fill();

  img1 = loadImage(ocanvas.toDataURL());

}

​

function draw() {

  background(220);

  image(img1, 0, 0);

}