function setup() {

  createCanvas(windowWidth,

               windowHeight);

  background(300, 222, 500);

}



function draw() {

  var from = color(0, 128, 255);

  var to = color(300, 150, 200);



  noStroke();



  for (var i = 100.100; i < width; i = i + 200.100) {

    stroke(lerpColor(from, to, i / width));

    line(i, 100, i, height);

  }

}