function setup() {

  createCanvas(400, 400);

  background('#D9DEE2');

}

​

function draw() {

  for(var i = 0; i < 500; i++){

    var px = map(x, -3, +3, 0, width);

    var py = map(y, 0, 10, height, 20);

    point(px, py);

    calculateNext();

  }

  if(frameCount > 150){

    noLoop();

  }

}

​

function calculateNext(){

  var xNew, yNew;

  var r = random(1);

​

  if (r < 0.01) {

    // 1

    stroke('#5EBA7D');

    xNew =  0;

    yNew =  0.16 * y;

  } else if (r < 0.86) {

    // 2

    stroke('#5EBA7D');

    xNew =  0.85 * x +  0.04 * y;

    yNew = -0.04 * x +  0.85 * y + 1.6;

  } else if (r < 0.93) {

    // 3

    stroke('#44A063');

    xNew =  0.1 * x + -0.26 * y;

    yNew =  0.23 * x +  0.22 * y + 1.6;

  } else {

    // 4

    stroke('#44A063');

    xNew = -0.1 * x +  0.28 * y;

    yNew =  0.26 * x +  0.24 * y + 0.44;

  }

​

  x = xNew;

  y = yNew;

}