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Creating a simple timer
This sketch shows how to construct a countdown timer effect.

Animation timer;
BFont font;
long duration = 30*1000; // 30 seconds.

void setup()
{
  size(200,100);
  strokeWeight(1);
  font = loadFont("RotisSanSer.vlw.gz");
  textFont(font, 20);

  timer = new Animation(this, loadImage("timer.gif"), 65,40, 75,0);
  timer.setDuration(duration);
}


void loop()
{
  background(127);
  rect(65,39, 75,timer.imageHeight());
  timer.draw();
  text("Time remaining: "
    + (duration - (int)(timer.currentPercentage() * duration)) / 1000
    + " seconds.", 15, 25);
}