// Daniel Shiffman

// http://natureofcode.com

​

// Koch Curve

// Renders a simple fractal, the Koch snowflake

// Each recursive level drawn in sequence

​

// An array for all the line segments

let segments = [];

​

function setup() {

  createCanvas(640, 240);

  let w = 200;

  let offset = (width - w) / 2;

  let y = 62;

  let a = createVector(offset, y);

  let b = createVector(width - offset, y);

  let c = createVector(width / 2, y + w * cos(PI / 6));

​

  // Starting with additional lines

  segments.push(new KochLine(a, b));

  segments.push(new KochLine(b, c));

  segments.push(new KochLine(c, a));

​

  //{!3} Apply the Koch rules five times.

  for (let i = 0; i < 5; i++) {

    generate();

  }

}

​

function draw() {

  background(255);

  for (let segment of segments) {

    segment.show();

  }

  noLoop();

}

​

function generate() {

  // Create the next array

  let next = [];

  // For every segment

  for (let segment of segments) {

    // Calculate 5 koch p5.Vectors (done for us by the line object)

    let a = segment.kochA();

    let b = segment.kochB();

    let c = segment.kochC();

    let d = segment.kochD();

    let e = segment.kochE();

    // Make line segments between all the vectors and add them

    next.push(new KochLine(a, b));

    next.push(new KochLine(b, c));

    next.push(new KochLine(c, d));

    next.push(new KochLine(d, e));

  }

  // The next segments!

  segments = next;

}