How to add +1 to variable every 10 seconds in Processing?

Question

Excuse my ignorance, but I ran into a problem that turned out to be challenging for my current knowledge in programming with Processing, even though the idea is quite simple

Answer 1

Ringo has a solution that's perfectly fine.

Another way you can do this easily is:

bool addOnce = false;
void draw()
{
  int time = (millis() % 10000) / 1000;
  if (time == 9)
  {
      if(!addOnce) {
          addOnce = true;
          i++;
      }
  } else { addOnce = false; }
}

As long as time == 9, we'll only get through if(!addOnce) one time.

After it changes, we reset the flag.