Countdown Timer once the time is set

sha_bi

Hi there, I'm totally new with processing. I'm trying to create something similar to this, Digital Stop watch by Charles Cave. But instead of starting it with 00:00:00, I want it start with a time that I have set. so for example if I set it to 20mins when I pressed T it will countdown to 0. something like that.

int accumTime;   // total time accumulated in previous intervals
int startTime;   // time when this interval started
boolean running = false;
int displayTime;   // value to display on the clock face

PFont smallfont;

void draw() {
  background(36, 19, 25);
  int thisTime = millis();
  int dHours, dMins, dSecs, dDecimal;

  if (keyPressed) {
      if ((key == 'c') || (key == 'C')) {
        // clear the time and stop the clock
        accumTime= 0;
        displayTime = 0;
      }
      if ((key == 't') || (key == 'T')) {
        // start timing (but only if running == false)
        if (running == false) {
            startTime = millis();
            running = true;
        }
      }
      if ((key == 's') || (key == 'S')) {
          // stop timing, but do not clear
          if (running == true) {
            println ("Stopped at " + thisTime);
            running = false;
            accumTime = accumTime + millis() - startTime;
          }
      }
    }
    if (running == true) {
          displayTime = accumTime + millis() - startTime;
    }

   dSecs = (displayTime / 1000) % 60;
   dMins = (displayTime / 1000 / 60) % 60;
   dHours = (displayTime / 1000 / 60/ 60);

    text(nf(dHours,2) + ":" + nf(dMins, 2) + ":" + nf(dSecs, 2),
      width/2, height/2 + 40);
}

void setup() {
  size(550,220);
  smooth();
  frameRate(20); 
  textSize(128);
  textAlign(CENTER);
  fill(202, 35, 55);

}

Any help greatly appreciated.

GoToLoop

https://forum.Processing.org/two/discussions/tagged/countdown