Timer

StopWatchTimer sw;

void setup() {
  size(400, 400);
  sw = new StopWatchTimer();
}

void draw () {
  background(0);
  time();
}

void time() {
  fill(255); // Barva števca
  textAlign(CENTER);
  textSize(15); // Velikost časa
  text(nf(sw.minute(), 2)+":"+nf(sw.second(), 2), width / 2, height / 2);
}

void keyPressed() {
  println(keyCode);
  
  // 84 = t, T
  if (keyCode == 84)
    sw.start();

  // 83 = s, S
  if (keyCode == 83)
    sw.stop();
}

// CLASS

class StopWatchTimer {

  int startTime;
  int stopTime;
  boolean running;

  StopWatchTimer() {
    startTime = 0;
    stopTime = 0;
    running = false;
  }

  void start() {
    startTime = millis();
    running = true;
  }

  void stop() {
    stopTime = millis();
    running = false;
  }

  int getElapsedTime() {
    int elapsed;
    if (running) {
      elapsed = (millis() - startTime);
    } else {
      elapsed = (stopTime - startTime);
    }
    return elapsed;
  }

  int second() {
    return (getElapsedTime() / 1000) % 60;
  }

  int minute() {
    return (getElapsedTime() / (1000*60)) % 60;
  }
}