class AnimImage {
  PImage image;
  int frames = 0;
  int tilewidth, tileheight;
  AnimImage(PImage image, int tilewidth, int tileheight) {
    this.image = image;
    this.tilewidth = tilewidth;
    this.tileheight = tileheight;
    frames = image.width/tilewidth;
  }
  void draw(float x, float y, int frame) {
    image(image, x,y, tilewidth, tileheight, frame*tilewidth, 0, (frame+1)*tilewidth, tileheight);
  }
  
}

abstract class Sprite {
  float x=0,y=0;
  float dx=0,dy=0;
  boolean alive = true;
  
  LevelScene level;
  
  abstract void draw();
  abstract void update();
}
class SpriteList {
  Vector sprites;
  SpriteList() {
    sprites = new Vector();
  }
  void add(Sprite s) {
    sprites.addElement(s);
  }
  void remove(Sprite s) {
    sprites.removeElement(s);
  }
  int size() {
    return sprites.size();
  }
  Sprite get(int i) {
    return (Sprite)sprites.elementAt(i);
  }
  void update() {
    Enumeration en = sprites.elements();
    while (en.hasMoreElements()) {
      Sprite s = (Sprite)en.nextElement();
      if (!s.alive)
        remove(s);
      else
        s.update();
    }
  }
  void draw() {
    Enumeration en = sprites.elements();
    while (en.hasMoreElements()) {
      Sprite s = (Sprite)en.nextElement();
      s.draw();
    }
  }
}