My Sketch - OpenProcessing

mySketch
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var speedX = 5;
var posX = 0;
var posY = 0;
var w = 64;
var h = 64;
var shiftDown = 75;
aliens = [];
function preload(){
  alien = loadImage("Spaceinvaders1.png");
}
​
function setup() {
  createCanvas(windowWidth, windowHeight);
  aliens = new Alien(posX, posY, speedX, shiftDown);
  //frameRate(2);
}
​
function draw() {
  background(0);
  aliens.display();
  aliens.move();
}
​
function Alien(x, y, speedX, shiftDown){
  this.x = x;
  this.y = y;
  this.changeDir = speedX;
  this.shiftDown = shiftDown;
  this.display = function(){
    for (var i = 0; i < 10; i++){
      copy(alien, 242, 104, w, h, this.x + (i*80), this.y + 5, w, h);
    }
    for (var i = 0; i < 10; i++){
      copy(alien, 338, 104, w, h, this.x + (i*80), this.y + 5, w, h);
    }
    for (var i = 0; i < 10; i++){
      copy(alien, 18, 105, w+24, h-2, this.x + (i*80), this.y + 75, w, h);
   }
    for (var i = 0; i < 10; i++){
      copy(alien, 130, 105, w+24, h-2, this.x + (i*80), this.y + 75, w, h);
   }
    for (var i = 0; i < 10; i++){
      copy(alien, 18, 105, w+24, h-2, this.x + (i*80), this.y + 145, w, h);
   }
    for (var i = 0; i < 10; i++){
      copy(alien, 130, 105, w+24, h-2, this.x + (i*80), this.y + 145, w, h);
   }
    for (var i = 0; i < 10; i++){
      copy(alien, 176, 18, w+32, h, this.x + (i*80), this.y + 215, w, h);
   }
    for (var i = 0; i < 10; i++){
      copy(alien, 296, 18, w+32, h, this.x + (i*80), this.y + 215, w, h);
  }  
    for (var i = 0; i < 10; i++){
     copy(alien, 176, 18, w+32, h, this.x + (i*80), this.y + 285, w, h);
   }
   for (var i = 0; i < 10; i++){
     copy(alien, 296, 18, w+32, h, this.x + (i*80), this.y + 285, w, h);
    }  
  }
  this.move = function(){
    this.x = this.x + this.changeDir; 
      if ((this.x >= width-770) || (this.x <= + 0)){
        this.changeDir = this.changeDir * -1;
        this.y = this.y + this.shiftDown;
    }
  }
}