Quadrille.cellLength = 20;
let quadrille;

function setup() {
  createCanvas(400, 400);
  reset();
}

function draw() {
  background('orange');
  drawQuadrille(quadrille);
}

function mouseClicked() {
  if (quadrille.height < 20) {
    quadrille.insert(quadrille.mouseRow);
  }
}

function keyPressed() {
  reset();
}

function reset() {
  quadrille = createQuadrille(20, 10, 50, color('red'));
  quadrille.rand(50, color('green')).rand(50, color('blue')).
            rand(50, color('cyan'));
}