public TetrisWorldEngine(TetrisWorld world, WorldEngineParams pars)
 {
     m_params = pars;
     m_world = world;
     m_rndGen = new Random();
 }
 public TetrisWorldEngine(TetrisWorld world, WorldEngineParams pars)
 {
     m_params = pars;
     m_world  = world;
     m_rndGen = new Random();
 }