ws2811b animation v2

#include "FastLED.h"
// Number of RGB LEDs in the strand
#define NUM_LEDS 30

// Define the array of leds
CRGB leds[NUM_LEDS];
int b;
// Arduino pin used for Data
#define PIN 6

void setup()
{
  FastLED.addLeds<NEOPIXEL, PIN>(leds, NUM_LEDS);

}

void loop() {
  // one at a time

  for (int i = 0 ; i < NUM_LEDS; i++ ) {
    b = i ;
    b-- ;
    leds[i].r = 255;
    leds[b].r = 0;
    FastLED.show();
    delay(75);
    leds[NUM_LEDS].r = 0;
  }
  for (int i = NUM_LEDS ; i >= 0; i-- ) {
    b = i ;
    b++ ;
    leds[i].r = 255;
    leds[b].r = 0;
    FastLED.show();
    delay(75);
    leds[0].r = 0;
  }

  for (int i = 0 ; i < NUM_LEDS; i++ ) {
    b = i ;
    b-- ;
    leds[i].g = 255;
    leds[b].g = 0;
    FastLED.show();
    delay(75);
    leds[NUM_LEDS].g = 0;
  }
  for (int i = NUM_LEDS ; i >= 0; i-- ) {
    b = i ;
    b++ ;
    leds[i].g = 255;
    leds[b].g = 0;
    FastLED.show();
    delay(75);
    leds[0].g = 0;
  }


  for (int i = 0 ; i < NUM_LEDS; i++ ) {
    b = i ;
    b-- ;
    leds[i].b = 255;
    leds[b].b = 0;
    FastLED.show();
    delay(75);
    leds[NUM_LEDS].b = 0;
  }
  for (int i = NUM_LEDS ; i >= 0; i-- ) {
    b = i ;
    b++ ;
    leds[i].b = 255;
    leds[b].b = 0;
    FastLED.show();
    delay(75);
    leds[0].b = 0;
  }
  for (int i = 0 ; i < NUM_LEDS; i++ ) {
    b = i ;
    b-- ;
    leds[i].r = 255;
    leds[b].r = 0;
    leds[i].g = 255;
    leds[b].g = 0;
    leds[i].b = 255;
    leds[b].b = 0;
    FastLED.show();
    delay(75);
    leds[NUM_LEDS].r = 0;
    leds[NUM_LEDS].g = 0;
    leds[NUM_LEDS].b = 0;
  }
  for (int i = NUM_LEDS ; i >= 0; i-- ) {
    b = i ;
    b++ ;
    leds[i].r = 255;
    leds[b].r = 0;
    leds[i].g = 255;
    leds[b].g = 0;
    leds[i].b = 255;
    leds[b].b = 0;
    FastLED.show();
    delay(75);
    leds[0].r = 0;
    leds[0].g = 0;
    leds[0].b = 0;
  }

  // growing/receeding bars
  for (int j = 0; j < 4; j++) {
    memset(leds, 0, NUM_LEDS * 3);
    for (int i = 0 ; i < NUM_LEDS; i++ ) {
      switch (j) {
        case 0: leds[i].r = 255; break;
        case 1: leds[i].g = 255; break;
        case 2: leds[i].b = 255; break;
        case 3: leds[i].r = 255; leds[i].g = 255; leds[i].b = 255; break;
      }
      FastLED.show();
      delay(50);
    }
    for (int i = NUM_LEDS - 1 ; i >= 0; i-- ) {
      switch (j) {
        case 0: leds[i].r = 0; break;
        case 1: leds[i].g = 0; break;
        case 2: leds[i].b = 0; break;
        case 3: leds[i].r = 0; leds[i].g = 0; leds[i].b = 0; break;
      }
      FastSPI_LED.show();
      delay(50);
    }
  }

  // Fade in/fade out

  for (int j = 0; j < 4; j++ ) {
    memset(leds, 0, NUM_LEDS * 3);
    for (int k = 0; k < 256; k++) {
      for (int i = 0; i < NUM_LEDS; i++ ) {
        switch (j) {
          case 0: leds[i].r = k; break;
          case 1: leds[i].g = k; break;
          case 2: leds[i].b = k; break;
          case 3: leds[i].r = k; leds[i].g = k; leds[i].b = k; break;
        }
      }
      FastLED.show();
      delay(8);
    }
    for (int k = 255; k >= 0; k--) {
      for (int i = 0; i < NUM_LEDS; i++ ) {
        switch (j) {
          case 0: leds[i].r = k; break;
          case 1: leds[i].g = k; break;
          case 2: leds[i].b = k; break;
          case 3: leds[i].r = k; leds[i].g = k; leds[i].b = k; break;
        }
      }
      FastLED.show();
      delay(8);
    }
  }

}