#include <Adafruit_NeoPixel.h>
#include <math.h>

#define PIN_WS2812B 26  // The ESP32 pin GPIO16 connected to WS2812B
#define NUM_PIXELS 64   // The number of LEDs (pixels) on WS2812B LED strip

int area_num = 3, area1 = 16, area2 = 32, area3 = 48, area4 = 64;
int stepTime = 50;
byte leds[][3] = {
  {0b10101011, 0b01010100, 0b01000110},
  {0b10101011, 0b01010100, 0b01000110},
  {0b10101011, 0b01010100, 0b01000110},
  {0b10101011, 0b01010100, 0b01000110},
  {0b10101011, 0b01010100, 0b01000110},
  {0b10101011, 0b01010100, 0b01000110},
  {0b10101011, 0b01010100, 0b01000110},
  {0b10101011, 0b01010100, 0b01000110}
};
Adafruit_NeoPixel ws2812b(NUM_PIXELS, PIN_WS2812B, NEO_GRB + NEO_KHZ800);

void setup() {
  Serial.begin(115200);
  Serial.println("Initializing...");
  pinMode (PIN_WS2812B, OUTPUT);
  ws2812b.begin();  // initialize WS2812B strip object (REQUIRED)
}

void loop() {
  ws2812b.clear();

  for (int pixel =  8 - 1; pixel >= 0; pixel--) {      // for each pixel
    byte resultR = (leds[0][0] >> pixel) & 0x01;
    byte resultG = (leds[0][1] >> pixel) & 0x01;
    byte resultB = (leds[0][2] >> pixel) & 0x01;
    Serial.print("\t pixel: ");
    Serial.print( pixel);
    Serial.print("\t RGB(");
    Serial.print(resultR);
    Serial.print(", ");
    Serial.print(resultG);
    Serial.print(", ");
    Serial.print(resultB);
    Serial.print(") ");
    ws2812b.setPixelColor(pixel, ws2812b.Color(255 * resultR, 255 * resultG, 255 * resultB)); // it only takes effect if pixels.show() is called
    ws2812b.show();                                          // update to the WS2812B Led Strip

    delay(stepTime);  // 500ms pause between each pixel
    Serial.println("");
  }
}
void test1() {
  // turn pixels to green one-by-one with delay between each pixel
  for (int pixel = 0; pixel < area1; pixel++) {         // for each pixel
    ws2812b.setPixelColor(pixel, ws2812b.Color(255, 0, 0));  // it only takes effect if pixels.show() is called
    ws2812b.show();                                          // update to the WS2812B Led Strip
    Serial.print("pixel: ");
    Serial.println( pixel);
    delay(stepTime);  // 500ms pause between each pixel
  }

  for (int pixel = area2 - 1; pixel >= area1; pixel--) {       // for each pixel
    ws2812b.setPixelColor(pixel, ws2812b.Color(0, 255, 0));  // it only takes effect if pixels.show() is called
    //ws2812b.setPixelColor(pixel, ws2812b.Color(0, 255, 0));  // it only takes effect if pixels.show() is called
    ws2812b.show();  // update to the WS2812B Led Strip
    Serial.print("\tpixel: ");
    Serial.println( pixel);
    delay(stepTime);  // 500ms pause between each pixel
  }

  for (int pixel = area2; pixel < area3; pixel++) {         // for each pixel
    ws2812b.setPixelColor(pixel, ws2812b.Color(0, 0, 255));  // it only takes effect if pixels.show() is called
    ws2812b.show();                                          // update to the WS2812B Led Strip
    Serial.print("\t\t pixel: ");
    Serial.println( pixel);
    delay(stepTime);  // 500ms pause between each pixel
  }
  for (int pixel = area4 - 1; pixel >= area3; pixel--) {       // for each pixel
    ws2812b.setPixelColor(pixel, ws2812b.Color(0, 255, 0));  // it only takes effect if pixels.show() is called
    ws2812b.show();  // update to the WS2812B Led Strip
    Serial.print("\tpixel: ");
    Serial.println( pixel);
    delay(stepTime);  // 500ms pause between each pixel
  }

  /* turn off all pixels for one seconds
    ws2812b.clear();
    ws2812b.show();  // update to the WS2812B Led Strip
    delay(1000);     // 1 second off time
  */
}