let columnHeight;

​

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  columnWidth = width / 3;

  columnHeight = height / 3;

  colorMode(HSB, 360, 100, 100);

}

​

function draw() {

  background(255);

​

  for (let counter = 0; counter < 3; counter++) {

    let x = counter * columnWidth;

    let y = height / 4;

    mouseOver1();

    rect(x, y, columnWidth, columnHeight);

  }

}

​

function mouseOver1() {

if (mouseX < columnWidth) {

  fill(map(mouseY, 0, 741, 0, 360));

}

}