Happy new year!

//Pierre MARZIN 28/12/2017

//Some "fireflies" are wandering around. 

//They are displayed only if they fly "above" the characters... or if they are "permanent"

//I used a very loose version of Dan Shiffman "boid" mobile object

​

var mytext="HAPPY\n2018";

var sheet;

var seekersArray;

var nworms;

var w, h;

var devMax=4;

//constrain the speed vector into a vMax radius circle

var vMax=2;

var ellipsedia;

var ellipsediainc;

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  imageMode(CENTER);

  noStroke();

  colorMode(HSB,360,255,255,255);

  background(0);

  w=windowWidth;

  h=windowHeight;

  init();

}

​

function draw() {

  background(0);

  if(nworms<5000){

    for (var i = 0; i < 5; i++) {

      var mSeeker = new Seeker();

      mSeeker.position = createVector(int(random(w)), int(random(h)));

      seekersArray.push(mSeeker);

      nworms++;

    }

  }

  else{

    if(mytext=="ALICE")mytext="HAPPY\n2018";

    else mytext="ALICE";

    sheet.background(0);

    init();

    /*sheet.fill(255);

    sheet.ellipse(windowWidth/2,windowHeight/2,ellipsedia+10,ellipsedia+10);

    sheet.fill(0);

    sheet.ellipse(windowWidth/2,windowHeight/2,ellipsedia,ellipsedia);

    sheet.loadPixels();

    ellipsedia+=ellipsediainc;

    if(ellipsedia>windowWidth)ellipsediainc=-ellipsediainc;

    if(ellipsedia<0)init();*/

  }

  for (var i = 0; i < nworms; i++) {

    var mSeeker = seekersArray[i];

    mSeeker.dessin();

    if (mSeeker.moved) {

      mSeeker.moved = false;

    }

  }

}

function init(){

  nworms=0;

  ellipsedia=10;

  ellipsediainc=20;

  sheet=createGraphics(windowWidth, windowHeight);

  sheet.fill(255);

  sheet.textSize(int(windowWidth*.2));

  sheet.textAlign(CENTER,CENTER);

  sheet.text(mytext, sheet.width/2, sheet.height/2);

  sheet.loadPixels();

  seekersArray = new Array(nworms);

}

​

function Seeker() {

  this.position = createVector(random(w), random(h));

  this.speed = createVector(random(-3, 3), random(-3, 3));

  this.dia = random(windowWidth*.004);

  this.inertia = random(-2, 2) + 12;

  this.radius = random(15, 25);

  this.trans=0;

  this.hue=random(1)>.8?random(65):60;

  if(random(1)>.99)this.hue=random(360);

  this.wandertheta=random(TWO_PI);

  this.up=true;

  this.lightchange=random(30,40);

  this.permanent=(random(1)>.98&&this.dia<5);

}

Seeker.prototype.dessin = function() {

  this.change=random(-1.5,1.5);

  this.wandertheta+=this.change;

  var vise = createVector(this.radius*sin(this.wandertheta+this.speed.heading()), this.radius*cos(this.wandertheta+this.speed.heading()));

  var deviation;

  this.speed.add(vise);

  deviation = this.speed.copy();

  deviation.setMag(devMax);

  this.speed.setMag(vMax);

  this.position.add(deviation);

  this.positionBrightness = this.getSourcePixelBrightness();

  if ((this.position.x < 1) || (this.position.y < 1) || (this.position.x > w - 1) || (this.position.y > h - 1)) // ||

  {

    this.deplace();

  } 

  if (this.positionBrightness>250||(this.trans<255&&this.trans>0)||this.permanent) {

    if(this.up){

      this.trans+=this.lightchange;

      if(this.trans>240)this.up=false;

    }

    else{

      this.trans-=this.lightchange;

      if(this.trans<0)this.up=true;

    }

    fill(this.hue,255,255, this.trans);

    push();

    translate(this.position.x, this.position.y);

    rotate(this.speed.heading());

    ellipse(-this.dia*.5,0,this.dia,this.dia);

    ellipse(this.dia*.5,0,this.dia,this.dia);

    pop();

  }

  else this.trans=0;

}

// *****************move the seeker function***************************

Seeker.prototype.deplace = function() {

  this.position = createVector(random(1, w - 1), random(1, h - 1));

  this.seek = this.position.copy();

}

​

Seeker.prototype.getSourcePixelBrightness = function() {

  var pos = 4 * (floor(this.position.x) + floor(this.position.y) * w);

  bri = sheet.pixels[pos];//.3 * sheet.pixels[pos] + .59 * sheet.pixels[pos + 1] + .11 * sheet.pixels[pos + 2];

  return bri;

}