class TimerBase {
  int iStartMillisecond;
  boolean bStarting;
  
  TimerBase(){
    iStartMillisecond = 0;    
    bStarting = false;
  } 

  void start(){
    iStartMillisecond = millis();
    bStarting = true;
  }

  void display(){
    int timeLeft = getTimeLeft();
    textSize( 30 );
    fill( 0 );
    text( timeLeft, 50, 50 );
  }

  int getTimeLeft(){
    if( 100-(millis()-iStartMillisecond)/1000 < 0 ){
      return 0;
    }
    return 100-(millis()-iStartMillisecond)/1000;
  }
}