var nextY = 0;

var x = 0;

var y = 0;

​

function setup() {

  createCanvas(800, 720);

  background(0);

}

​

function drawPoint() {

​

  var px = map(x, -6, 6, 0, width);

  var py = map(y, 0, 10, height, 0);

  stroke(px-200, px-py - 280, py);

  strokeWeight(4);

  point(px, py);

}

​

function draw() {

  for(var i = 0; i < 100; i++) {

    drawPoint();

    calcBF();

    rotate(PI/7);

  }

  //print(nextX, nextY);

}

​

function calcBF() {

  var r = random(1);

  //01

  if (r < 0.01) {

    nextX = 0;

    nextY = 0.16 * nextY;

  }

  //2

  else if (r < 0.86) {

    nextX = 0.85  * nextX + 0.04 * nextY;

    nextY = -0.04 * nextX + 0.85 * nextY + 1.6;

  }

  //03

  else if (r < 0.93) {

    nextX = 0.2  * nextX - 0.26 * nextY;

    nextY = 0.23 * nextX + 0.22 * nextY + 1.6;

  } 

   else {

    //04

    nextX = -0.15 * nextX + 0.28 * nextY;

    nextY = 0.26  * nextX + 0.24 * nextY + 0.44;

  }

  x = nextX;

  y = nextY;

}

​