[Arduino] A walk through the spectrum (RGB LED)

//here is the example using Fritzing
//http://1drv.ms/1h1cQKQ
//(the link is to OneDrive)
//in this case I'm using a RGB Anode led
//and, for those who does not know hoe the RGB led works, here's the answer
//http://www.instructables.com/answers/How-do-multi-colored-led-lights-work/


// Init the Pins used for PWM
const int redPin = 9;
const int greenPin = 10;
const int bluePin = 11;

const int buttonPin = 13;
int buttonState = LOW;

int currentColorValueRed;
int currentColorValueGreen;
int currentColorValueBlue;

void setup()
{
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);

  pinMode(buttonPin, INPUT);
  Serial.begin(9600);
}

void loop()
{

  int i;

  currentColorValueRed = 0;
  currentColorValueGreen = 255;
  currentColorValueBlue = 255;

  analogWrite(redPin, currentColorValueRed);
  analogWrite(greenPin, currentColorValueGreen);
  analogWrite(bluePin, currentColorValueBlue);

  for(i = 255; i > 0; i--) {
    currentColorValueGreen --;
    analogWrite(redPin, currentColorValueRed);
    analogWrite(greenPin, currentColorValueGreen);
    analogWrite(bluePin, currentColorValueBlue);
    delay(10);
  }
  for(i = 255; i > 0; i--) {
    currentColorValueRed ++;
    analogWrite(redPin, currentColorValueRed);
    analogWrite(greenPin, currentColorValueGreen);
    analogWrite(bluePin, currentColorValueBlue);
    delay(10);
  }
  for(i = 255; i > 0; i--) {
    currentColorValueBlue --;
    analogWrite(redPin, currentColorValueRed);
    analogWrite(greenPin, currentColorValueGreen);
    analogWrite(bluePin, currentColorValueBlue);
    delay(10);
  }
  for(i = 255; i > 0; i--) {
    currentColorValueGreen ++;
    analogWrite(redPin, currentColorValueRed);
    analogWrite(greenPin, currentColorValueGreen);
    analogWrite(bluePin, currentColorValueBlue);
    delay(10);
  }
  for(i = 255; i > 0; i--) {
    currentColorValueRed --;
    analogWrite(redPin, currentColorValueRed);
    analogWrite(greenPin, currentColorValueGreen);
    analogWrite(bluePin, currentColorValueBlue);
    delay(10);
  }
  for(i = 255; i > 0; i--) {
    currentColorValueBlue ++;
    analogWrite(redPin, currentColorValueRed);
    analogWrite(greenPin, currentColorValueGreen);
    analogWrite(bluePin, currentColorValueBlue);
    delay(10);
  }
}