var xoff2 = 1000000;

​

​

function setup() {

  var n = 600;

  width = n;

  height = n;

  createCanvas(n, n);

  pixelDensity(1);

}

​

function draw() {

  background(0, 100);

  var n = 600;

  updatePixels();

  noStroke();

  fill(0, 60);

  var x = map(noise(xoff1), 0, 1, 0, width);

  var y = map(noise(xoff2), 0, 1, 0, height);

  xoff1 += 0.01;

  xoff2 += 0.01;

  ellipse(x, y, 20); 

  loadPixels();

  for (var y1 = 0; y1 < height; y1 += 1){

    for(var x1 = 0; x1 < width; x1 += 1){

      var index = (x1 + y1 * width)*4;

      pixels[index + 0] = x + y - n + 200;

      pixels[index + 1] = x1;

      pixels[index + 2] = y1;

      pixels[index + 3] = 255;

    }

  }

}