Rainbow Cycle Code

void rainbowCycle(float speed) {
  float r = 255;
  float g = 0;
  float b = 0;
  while (g < 127){
    background(r,g,b);
    g = g+speed;
  }
  while (r > 0 && g <= 255) {
    background(r,g,b);
    r = r-speed;
    g = g+speed;
  }
  while (b < 127) {
    background(r,g,b);
    b = b+speed;
  }
  while (g > 0 && b <= 255) {
    background(r,g,b);
    g = g-speed;
    b = b+speed;
  }
  while (r < 127) {
    background(r,g,b);
    r = r+speed;
  }
  while (b > 0 && r <=255) {
    background(r,g,b);
    b = b-speed;
    r = r+speed;
  }
}