// The Coding Train / Daniel Shiffman

// https://thecodingtrain.com/challenges/14-fractal-trees-recursive

// https://youtu.be/0jjeOYMjmDU

​

// https://editor.p5js.org/codingtrain/sketches/xTjmYXU3q

​

let angle = 0;

let slider;

​

function setup() {

  createCanvas(640, 360);

  slider = createSlider(0, TWO_PI, PI / 4, 0.01);

}

​

function draw() {

  background(0);

  angle = slider.value();

  stroke(255);

  strokeWeight(2);

  translate(width * 0.5, height);

  branch(100);

}

​

function branch(len) {

  line(0, 0, 0, -len);

  translate(0, -len);

  if (len > 4) {

    push();

    rotate(angle);

    branch(len * 0.67);

    pop();

    push();

    rotate(-angle);

    branch(len * 0.67);

    pop();

  }

}

​