class invader{
  float x,y,originX,originY;
  int dir=1;
  float speed, speedIncrement;
  int yStep;
  int distanceAllowed = 60;
  boolean alive = true ;
  int id = -1;
  int myTime = 0;
  int frameInterval = 200;
  boolean frameOne = true;

  invader(int _x, int _y, int _id, float _s, float _si, int _ys){
    x=originX=_x;
    y=originY=_y;
    id = _id;
    speed = _s;
    speedIncrement = _si;
    yStep = _ys;
  } 

  void update(){
    if(alive){
      move();
      drawMe(); 
    }
  }

  void move(){
    x += speed*dir;
    //if(id==20){
    //  println(x+"__"+originX);
    //  println((abs(originX-x)>distanceAllowed));
    //println("x="+x+"  s+d:"+speed*dir);  
    //}

    //Si llegamos al punto que hay que cambiar de dirección... 
    if(abs(x-originX)>distanceAllowed){
      dir = -dir;
      y += yStep; 
      speed += speedIncrement;
    }
  }

  void drawMe(){
    if(millis() - myTime > frameInterval){
      myTime = millis();
      frameOne = !frameOne;
    }
    if(frameOne){
      image(invadersFrameOne,x,y);
    } 
    else {
      image(invadersFrameTwo,x,y);
    }
  }

  //GETs y SETs
  void setX(int _x){
    x=_x;
  }
  void setY(int _y){
    y=_y;
  }
  float getX(){
    return x;
  }
  float getY(){
    return y;
  }
  void kill(){
    alive = false; 
  }
  boolean isAlive(){
    if(alive)return true;
    else return false;
  }

}