#include <FastLED.h>

#define DATA_PIN    3                //set your datapin
#define LED_TYPE    WS2812B          //leds type
#define COLOR_ORDER GRB              //color order of leds
#define MAX_POWER_MILLIAMPS 800     //write here your power in milliamps. default i set 800 mA for safety

#define NUM_COLS    16
#define NUM_ROWS    16
#define NUM_LEDS    256

CRGB leds[NUM_LEDS + 1];

byte potpin = 0;  // analog pin used to connect the potentiometer1
byte potpin1 = 1; // analog pin used to connect the potentiometer2
byte BRIGHTNESS = 255;

void setup() {
  FastLED.addLeds<LED_TYPE, DATA_PIN, COLOR_ORDER>(leds, NUM_LEDS)
  // .setCorrection( TypicalLEDStrip )
  ;
  //   FastLED.setMaxPowerInVoltsAndMilliamps( 5, MAX_POWER_MILLIAMPS);

  FastLED.setBrightness(BRIGHTNESS);
  FastLED.clear();
}


void loop() {

int a= millis()/4;
int a1 = a/2;
int a2= a/3;

fadeToBlackBy(leds, NUM_LEDS, 20);

// for (int i = 0; i < 16; i++) {
//  byte y = sin8(i*slider1()+a)*16/255;

// nblend (leds [XY(i,y)], CHSV(i*255/15+a2,255,255),64); 
// }

byte sl1= slider1()/4;
byte sl2= slider2()/4;
for (int x = 0; x < 16; x++) {
  for (int y = 0; y < 16; y++) {
    int index = XY(x, y);
    // byte xoffs = (sin8(x*sl1)+cos8(y*sl2+a2))/2;
    byte ind = sin8(x*sl1+sin8(x*2+a2))/2+sin8(y*sl2+sin8(y*2+a1)/2)/2;
    byte yoffs = inoise8(x*(sin8(a2)/8+32)+a1, y*(cos8(a1)/8+32), a2);

    leds[index] = CHSV ((ind+yoffs)/2, 255, 255);
    // leds[index].setHue(yoffs);
  }
}
LEDS.show();
}



uint16_t XY(byte x, byte y) {     // calculate index in leds from XY coordinates for planar mapping
uint16_t ledsindex =y*NUM_COLS+x;
return (ledsindex);
}

byte slider1(){
  int val = analogRead(potpin);            // reads the value of the potentiometer (value between 0 and 1023)
  val = map(val, 0, 1023, 0, 255);         // map value between 0 and 255
  return (val);
}

byte slider2(){
  int val = analogRead(potpin1);            // reads the value of the potentiometer (value between 0 and 1023)
  val = map(val, 0, 1023, 0, 255);         // map value between 0 and 255
  return (val);
}