function Particle(x,y,hu,firework){
  this.firework = firework;
  this.lifespan = 255;
  this.hu = hu;

  this.pos = createVector(x,y);
  if (this.firework)
  this.vel = createVector(0,random(-10,-18));
  else{
    this.vel = p5.Vector.random2D();
    this.vel.mult(random(4,12));
  }
  this.acc = createVector(0,0);


  this.applyForce = function(force){
    this.acc.add(force);
  }

  this.done = function(){
    if (this.lifespan<=0)
    return true;
    else return false;
  }

  this.update = function(){
    if(!this.firework){
      this.vel.mult(0.9);
      this.lifespan -=4;
    }
    this.vel.add(this.acc);
    this.pos.add(this.vel);
    this.acc.mult(0);
  }

  this.show = function(){
    colorMode(HSB);
    if(!this.firework){
      strokeWeight(2);
      stroke(hu,255,255,this.lifespan);
    }
    else {
    stroke(hu,255,255);
    }

    point(this.pos.x,this.pos.y);
  }

}