/*******************************************************************************/
Game g = null;

void setup() {
  size(240,240);
  g = new Game();
}
void loop() {
  g.update();
  g.draw();
}
/*******************************************************************************/


class Game {
  Scene s;
  
  Game() {
    goScene("Title");
  }
  void goScene(String name) {
    s = getScene(name);
  }
  void update() { if (s!=null) s.update(); }

  void draw() { if (s!=null) s.draw(); }
}

/*******************************************************************************/


abstract class Scene {
  abstract void draw();
  abstract void update();
}

Hashtable scenes = new Hashtable();

Scene getScene(String s) {
  try {
    return getScene(Class.forName(getClass().getName()+'$'+s+"Scene"));
  } catch (ClassNotFoundException ex) {
    ex.printStackTrace();
    return null;
  }
}
Scene getScene(Class clazz) {
  Object o = scenes.get(clazz);
  if (o!=null) return (Scene)o;
  try {
    // instantiate the inner class
    o = clazz.getConstructor(new Class[]{getClass()}).newInstance(new Object[]{this});
  } catch (Exception ex) {
    ex.printStackTrace();
  }
  scenes.put(clazz,o);
  return (Scene)o;
}

/*******************************************************************************/
class Stars {
  float x[], y[], dy[];
  
  Stars(int count) {
    x = new float[count];
    y = new float[count];
    dy = new float[count];
    
    for (int i=0; i<count; i++) {
      x[i] = random(0,width);
      y[i] = random(0,height);
      dy[i] = random(1,4);
    }
  }
  
  void draw() {
    smooth();
    stroke(255);
    for (int i=0; i<x.length; i++)
      line(x[i],y[i],x[i],y[i]+dy[i]*4);
  }
  void update() {
    for (int i=0; i<x.length; i++) {
      y[i] -= dy[i];
      if (y[i]<0) {
        y[i] += height;
        x[i] = random(0,width);
      dy[i] = random(1,4);
      }
    }
  }
}

class TitleScene extends Scene {
  BImage bg;
  
  Stars s = new Stars(300);
  
  public TitleScene() {
    bg = loadImage("title.jpg");
    
  }
  
  void draw() {
    background(bg);
    
    s.draw();
    
  }
  void update() {
    s.update();
    if (keyPressed) {
      g.goScene("Level");
    }
  }
}
class LevelScene extends Scene {

  Stars s = new Stars(300);
  
  public LevelScene() {
  }
  
  void draw() {
    background(0);
    s.draw();
  }
  void update() {
    s.update();
  }
}

/*******************************************************************************/