#include <FastLED.h>

// Wie viele LEds auf dem Streifen?
#define NUM_LEDS 120
#define DATA_PIN 6

CRGB leds[NUM_LEDS];
const int side_height = 10;
const int side_length = 12;
// Bestimmung der Zeilen und 


// This function sets up the leds and tells the controller about them
void setup() {
  // sanity check delay - allows reprogramming if accidently blowing power w/leds
  delay(2000);
  FastLED.addLeds<NEOPIXEL, DATA_PIN>(leds, NUM_LEDS);  // GRB ordering is assumed$
  FastLED.clear();
}

void loop() {
  FastLED.clear();
  
  for (int i = 0; i < side_length; i++) {    //step through the columns
    for (int j = 0; j < side_height; j++) {  //step through the rows
      leds[XY(i, j, side_height)] = CHSV(255 / side_length * i, 200, 255);
      FastLED.show();
      delay(40);
    }
  }
  /*
  for (int j = 0; j < NUM_LEDS; j++) {  //step through the leds
    leds[j] = CHSV(255 / NUM_LEDS * j, 0, 255);
    FastLED.show();
    delay(40);
    fadeToBlackBy(leds, NUM_LEDS, 200);
  } */
}

int XY(int x, int y, int height) {
  int number;
  if ((x % 2) == 0) {  //checks if even
    number = 120 - height * x - 10 + y;
  } else {
    number = 120 - height * x - y - 1;
  }
  return number;
}