#include <MD_MAX72xx.h>

#define HARDWARE_TYPE MD_MAX72XX::PAROLA_HW
#define MAX_DEVICES 2

#define DATA_PIN  2
#define CS_PIN    3
#define CLK_PIN   4

MD_MAX72XX mx = MD_MAX72XX(HARDWARE_TYPE, DATA_PIN, CLK_PIN, CS_PIN, MAX_DEVICES);

int bally = 0;
int ballx = 0;

int xDir = 0;
int yDir = 0;

int speed = 500;
long time = 0;



void setup()
{
  Serial.begin(115200);
  pinMode(5, INPUT);

  mx.begin();
  mx.clear();


}





void threePoint(int x, int y)
{

  mx.setPoint(x, y, true);

  if (x == 7 && y == 0)
  {
    mx.setPoint(7, 1, true);
    mx.setPoint(6, 0, true);
  }
  if (x == 0 && y == 0)
  {
    mx.setPoint(1, 0, true);
    mx.setPoint(0, 1, true);
  }
  if (x == 0 && y == 7)
  {
    mx.setPoint(0, 6, true);
    mx.setPoint(1, 7, true);
  }
  if (x == 7 && y == 7)
  {
    mx.setPoint(7, 6, true);
    mx.setPoint(6, 7, true);
  }

  if ((x < 7 && x > 0) && (y == 0 || y == 7))
  {
    mx.setPoint(x - 1, y, true);
    mx.setPoint(x + 1, y, true);
  }
  if ((y < 7 && y > 0) && (x == 0 || x == 7))
  {
    mx.setPoint(x, y - 1, true);
    mx.setPoint(x, y + 1, true);
  }
}

void loop()
{
  mx.setPoint(bally, ballx, true);
  threePoint(0, 3);
  
  
    if (millis() - time > speed)
    {

      mx.setPoint(bally, ballx, false);

      if (ballx == 7 && bally == 7)
      {
        xDir = -1;
        yDir = 0;
      }
      if (ballx == 7 && bally == 0)
      {
        xDir = 0;
        yDir = 1;
      }
      if (ballx == 0 && bally == 7)
      {
        xDir = 0;
        yDir = -1;
      }
      if (ballx == 0 && bally == 0)
      {
        xDir = 1;
        yDir = 0;
      }

      ballx += xDir;
      bally += yDir;

      time = millis();

    }
}