class FrameAnim {
  PImage[] frames;
  int index, start, end;
  int rate;
  int wait;

  FrameAnim(String name, int num) {
    index = start = end = 0;
    rate = 2;
    wait = 2;
    
    frames = new PImage[num];
    for(int i=0 ; i < num ; i++) {
      frames[i] = loadImage(name + "/chara_" + nf(i,2) + ".png");
    }
  }
  
  PImage img() {
    return frames[index];
  }
  
  void setAnim(int st, int len, int _rate) {
    start = index = st;
    end = start + len;
    rate = _rate;
    wait = 0;
  }
  
  void step() {
    wait++;
    if(wait > ( 30 / rate ) ) {
      wait = 0;
      index++;
      if(index >= end) index = start;
    } 
  }

}