let sliderAngle;

​

function setup() {

  createCanvas(800, 800);

  slider = createSlider(0, 40, 25);

  sliderAngle = createSlider(0, 180, 45)

  slider.input(redraw);

  sliderAngle.input(redraw);

}

​

function draw() {

  background(220);

  translate(width/2, height/20);

  branch(slider.value(), true, sliderAngle.value());

  noLoop();

}

​

function mousePressed() {

  redraw();

}

​

function branch(len, two, angle) {

  line(0,0,0,len);

  translate(0,len);

  if (len < 18) {

    return

  }

  push()

  if (random(16) < 1) {

    circle(0,0,10)

    return;

  }

  rotate(radians(angle));

  branch(len - 1, !two, -angle);

  pop()

  if (two) {

    if (random(16) < 1) {

      circle(0,0,10)

    return;

    }

    push()

    rotate(radians(-angle));

    branch(len - 1, !two, angle);

    pop()

  }

  circle(0,0,10)

}