#include <Adafruit_GFX.h>
#include <Adafruit_NeoMatrix.h>
#include <Adafruit_NeoPixel.h>
#include <RotaryEncoder.h>

#define PIN 6
#define MATRIX_WEIGHT 15
#define MATRIX_HEIGHT 15

Adafruit_NeoMatrix matrix = Adafruit_NeoMatrix(MATRIX_WEIGHT, MATRIX_HEIGHT, PIN,
  NEO_MATRIX_BOTTOM     + NEO_MATRIX_LEFT +
  NEO_MATRIX_ROWS + NEO_MATRIX_ZIGZAG,
  NEO_GRB            + NEO_KHZ800);

RotaryEncoder encoder_x(A0, A1);
RotaryEncoder encoder_y(A2, A3);

int newPos_x = 0;
int newPos_y = 0; 
char buf_x[50];
char buf_y[50];

void setup() 
{
  Serial.begin(9600);
  matrix.begin();
  matrix.setBrightness(100);

}

void loop() {

  static int pos_x = 0;
  static int pos_y = 0;

  encoder_x.tick();
  encoder_y.tick();

  int newPos_x = encoder_x.getPosition();
  int newPos_y = encoder_y.getPosition();

  matrix.drawPixel(0, 0, matrix.Color(0xff, 0xff, 0x00));
  matrix.show();

  if(newPos_x != pos_x || newPos_y != pos_y)
  {
    sprintf(buf_x, "Posição x: ", newPos_x);
    Serial.println(newPos_x);
    sprintf(buf_y, "Posição y: ", newPos_y);
    Serial.println(newPos_y);

    matrix.drawPixel(newPos_x, newPos_y, matrix.Color(0xff, 0xff, 0x00));
    matrix.show();

    pos_x = newPos_x;
    pos_y = newPos_y;
  }
}