#include "FastLED.h"
#define NUM_LEDS 60 
CRGB leds[NUM_LEDS];
#define PIN 6 

void setup()
{
  FastLED.addLeds<WS2811, PIN, GRB>(leds, NUM_LEDS).setCorrection( TypicalLEDStrip );
}

// *** REPLACE FROM HERE ***
void loop() { 
  FadeInOut(0xff, 0x00, 0x00); // red
  FadeInOut(0xff, 0xff, 0xff); // white 
  FadeInOut(0x00, 0x00, 0xff); // blue
}

void FadeInOut(byte red, byte green, byte blue){
  float r, g, b;
      
  for(int k = 0; k < 256; k=k+1) { 
    r = (k/256.0)*red;
    g = (k/256.0)*green;
    b = (k/256.0)*blue;
    setAll(r,g,b);
    showStrip();
  }
     
  for(int k = 255; k >= 0; k=k-2) {
    r = (k/256.0)*red;
    g = (k/256.0)*green;
    b = (k/256.0)*blue;
    setAll(r,g,b);
    showStrip();
  }
}

// *** REPLACE TO HERE ***

void showStrip() {
 #ifdef ADAFRUIT_NEOPIXEL_H 
   // NeoPixel
   strip.show();
 #endif
 #ifndef ADAFRUIT_NEOPIXEL_H
   // FastLED
   FastLED.show();
 #endif
}

void setPixel(int Pixel, byte red, byte green, byte blue) {
 #ifdef ADAFRUIT_NEOPIXEL_H 
   // NeoPixel
   strip.setPixelColor(Pixel, strip.Color(red, green, blue));
 #endif
 #ifndef ADAFRUIT_NEOPIXEL_H 
   // FastLED
   leds[Pixel].r = red;
   leds[Pixel].g = green;
   leds[Pixel].b = blue;
 #endif
}

void setAll(byte red, byte green, byte blue) {
  for(int i = 0; i < NUM_LEDS; i++ ) {
    setPixel(i, red, green, blue); 
  }
  showStrip();
}