​

let fluid;

let PERIOD = 6;

var days;

var daysPassed;

​

function setup() {

  createCanvas(400, 400);

  days = 1;

  daysPassed = false;

  fluid = new Fluid(0.2, 0, 0.0000001);

}

​

function draw() {

​

​

​

  stroke(51);

  strokeWeight(2);

​

  let cx = int(0.5 * width / SCALE);

  let cy = int(0.5 * height / SCALE);

  for (let i = -2; i <= 2; i++) {

    for (let j = -2; j <= 2; j++) {

      fluid.addDensity(cx + i, cy + j, 

                       doubleEllipticOgee(second()*0.01, 0.270,0.707)*100);      

    }

  }

​

  for (let i = 0; i < 2; i++) {

    let angle = radians(map(second(), 0, 60, -90, 270));

    let v = p5.Vector.fromAngle(angle);

    v.mult(0.2);

    t += 0.01;

    fluid.addVelocity(cx, cy, v.x, v.y);

​

  }

​

​

  fluid.step();

  fluid.renderD();

  drawPeriodDays();

}

​

function drawPeriodDays() {

  push();

  angleMode(DEGREES);

  noFill();

  translate(200, 200);

  rotate(-90);

  calculateDays();

  let endDay = map(days%28, 0, 28, 0, 360);

  let endPeriod = map(min(PERIOD, days%28), 0, 28, 0, 360);

  stroke(255);

  strokeWeight(1);

  arc(0, 0, 240, 240, 0, endDay);

​

  strokeWeight(3);

  stroke(255, 100, 100);

  if (days%28 != 0){

  arc(0, 0, 240, 240, 0, endPeriod);

  }

  pop();

}

​

function doubleEllipticOgee(_x, _a, _b)

  {

    if(!_a) _a = 0.25; // default

    if(!_b) _b = 0.75; // default

​

    var min_param_a = 0.0 + Number.EPSILON;

    var max_param_a = 1.0 - Number.EPSILON;

    _a = constrain(_a, min_param_a, max_param_a);

    var _y = 0;

​

    if (_x<=_a){

      _y = (_b/_a) * sqrt(sq(_a) - sq(_x-_a));

    }

    else {

      _y = 1.0 - ((1.0-_b)/(1.0-_a))*sqrt(sq(1.0-_a) - sq(_x-_a));

      print((sq(1.0-_a) - sq(_x-_a)));

    }

    return(_y);

  }

​

function calculateDays() {

  if (hour() == 0 && minute() == 0 && second() == 0) {

    if(daysPassed == false){

      days ++;

      daysPassed = true;

    }

  }

  if (hour() != 0 || minute() != 0 || second() != 0) {

    daysPassed = false;

  }

}