// Daniel Shiffman

// http://natureofcode.com

​

let lsystem;

let turtle;

​

function setup() {

  createCanvas(640, 240);

​

  let rules = {

    F: "FF+[+F-F-F]-[-F+F+F]",

  };

  lsystem = new LSystem("F", rules);

  turtle = new Turtle(4, radians(25));

​

  for (let i = 0; i < 4; i++) {

    lsystem.generate();

  }

​

  // Some other rules

  // let ruleset = {

  //   F: "F[F]-F+F[--F]+F-F",

  // };

  // lsystem = new LSystem("F-F-F-F", ruleset);

  // turtle = new Turtle(4, PI / 2);

​

  // let ruleset = {

  //   F: "F--F--F--G",

  //   G: "GG",

  // };

  // lsystem = new LSystem("F--F--F", ruleset);

  // turtle = new Turtle(8, PI / 3);

}

​

function draw() {

  background(255);

  translate(width / 2, height);

  turtle.render(lsystem.sentence);

  noLoop();

}