Animation animation1;

void setup() {
  size(400, 300);
  frameRate(8);
  animation1 = new Animation("_", 26);

}

void draw() { 

  if (mousePressed) {
    animation1.displayZ(0, 0);
  } 
  else {
    animation1.displayA(0, 0);
  }
}

// Class for animating a sequence of GIFs

class Animation {
  PImage[] images;
  int imageCount;
  int frame;

  Animation(String imagePrefix, int count) {
    imageCount = count;
    images = new PImage[imageCount];

    for (int i = 0; i < imageCount; i++) {
      // Use nf() to number format 'i' 
      String filename = imagePrefix + nf(i, 3) + ".JPG";
      images[i] = loadImage(filename);
    }
  }

  void displayA(float a, float b) {
    frame = (frame+1) % imageCount;
    image(images[frame], 0, 0);
    //println("A"+ frame);
  }


  void displayZ(float a, float b) {
    frame = abs(frame-1) % imageCount;
    image(images[frame], 0, 0);
    //println("Z"+ frame);
  
  }

  int getWidth() {
    return images[0].width;
  }
}