float speed = .01;

int index;
int lastPrime;
float angle;
color rgb;
float r, g, b;
float[] digits = new float[5];
float total;
float rectLength;

void setup() {
  fullScreen();
  frameRate(2);
}

void draw() {
  background(0);
  angle += speed;
  if (!primeReturn(index))
   textDisplay(lastPrime);
  index++;
  fill(255);
  for (int i = 0; i < digits.length; i++)
   total += digits[i];
  for(int i = 0; i < digits.length; i++) {
   rectLength = map(digits[i], 0, total, 0, width);
   rect(50, 50 + i * 50, rectLength, 100 + i * 50);
  }
  total = 0;
}

boolean primeReturn(int index_) {
  int index = index_;
  double i = 3;
  if (index == 3 || index == 2) {
   textDisplay(index);
   lastPrime = index;
   return true;
  }
  if (index % 2 != 0)
   while(index % i != 0) {
    if (i >= Math.sqrt(index)) {
      textDisplay(index);
      lastPrime = index;
      switch (index % 10) {
       case 1 :
        digits[0]++;
       case 3 :
        digits[1]++;
       case 5 :
        digits[2]++;
       case 7 :
        digits[3]++;
       case 9 :
        digits[4]++;
      }
      return true;
    }
    i += 2;
   }
  return false;
}

void textDisplay(int number) {
 textAlign(CENTER);
 textSize(30);
 fill(255);
 text("BREAKING NEWS! THE LARGEST PRIME NUMBER CALCULATED", width/2, height/2 - 200);
 text("ON THIS COMPUTER JUST CAME IN. IT'S : ", width/2, height/2 - 150);
 r = map(cos(angle), 0, 1, 100, 255);
 g = map(sin(angle), 0, 1, 100, 255);
 b = map(tan(angle), 0, 1, 100, 255);
 fill(r, g, b);
 textSize(100);
 text(number, width/2, height/2 + 100);
}