/**
 * Bouncing Counter (v1.0)
 * by GoToLoop (2013/Feb);
 * for OliveHunt
 *
 * http://forum.processing.org/topic/
 * decrease-a-value-until-it-reaches-another-value-and-then-
 * increase-a-value-until-it-reaches-the-original-value-and-repeat
 */

final static short minVal = 1, maxVal = 255;
short value = 255;
byte  incVal = -1;

void setup() {
  size(200, 150);
  frameRate(15);

  fill(#FFFF00);
  textAlign(CENTER, CENTER);
  textSize(70);
}

void draw() {
  background(0);

  text(value, width>>1, height>>1);

  if ( value+incVal > maxVal | value+incVal < minVal)
    incVal *= -1;

  value += incVal;
}