let triggerOn = false;

​

function setup() {

  createCanvas(600, 600);

    background(240);

}

​

function draw() {

  stroke(0, 0, 0, 150);

  translate(mouseX, mouseY);

  if (mouseIsPressed) {

    if (!triggerOn) {

      rotation = random(0, PI/4)

      triggerOn = true;

    }

    rotate(rotation);

    line(-width/2, 0, width/2, 0);

  } else {

    triggerOn = false; 

  }

}

​

function keyPressed() {

  if (key === "r") {

    background(240); 

  }

}

​