/*
  Colorful Tunnel FastLED demo on APA102 Matrix

  https://wokwi.com/arduino/projects/309664470325527104

  Copyright (C) 2021 Uri Shaked
*/

#include "FastLED.h"

// Matrix size
#define NUM_ROWS 16
#define NUM_COLS 16

// LEDs pin
#define DATA_PIN 4
#define CLOCK_PIN 3

// LED brightness
#define BRIGHTNESS 255

#define NUM_LEDS NUM_ROWS * NUM_COLS

// Define the array of leds
CRGB leds[NUM_LEDS];

void setup() {
  FastLED.addLeds<APA102, DATA_PIN, CLOCK_PIN, BGR>(leds, NUM_LEDS);

  FastLED.setBrightness(BRIGHTNESS);
}

int counter = 0;
void loop() {
  for (byte row = 0; row < NUM_ROWS; row++) {
    for (byte col = 0; col < NUM_COLS; col++) {
      int delta = abs8(NUM_ROWS - row * 2) + abs8(NUM_COLS - col * 2);
      leds[row * NUM_COLS + col] = CHSV(delta * 4 + counter, 255, 255);
    }
  }
  FastLED.show();
  delay(5);
  counter++;
}