createCanvas(600, 400);

  noStroke();

  let div = 2;

  let w = width/div;

  rectMode(CENTER);

  for (let x = w/2; x < width; x += w) {

    let c = map(x, 0, width, 0, 255)/255;

    let factor = div - 1;

    c = round(c * factor) / factor;

        console.log(c);

    fill(c*255);

​

    rect(x, 0, w, height);

  }

}

​

function draw() {

  //background(220);

}