let gogo = true;

​

function setup() {

  createCanvas(800, 800);

  x = width / 2;

  y = height / 2;

​

  pdf = createPDF();

  pdf.beginRecord();

​

  strokeWeight(1);

  noFill();

  stroke(0);

​

  background(255);

}

​

function draw() {

  let nextX = x + random(-20, 20);

  let nextY = y + random(-20, 20);

  nextX = constrain(nextX, width / 2 - 100, width / 2 + 100);

  nextY = constrain(nextY, height / 2 - 100, height / 2 + 100);

​

  line(x, y, nextX, nextY);

​

  x = nextX;

  y = nextY;

}

​

function mousePressed() {

  if (gogo) {

    noLoop();

  } else {

    loop();

  }

  gogo = !gogo;

}

​

function keyPressed() {

  if (keyCode === ENTER) {

    pdf.save();

  }

}

​