#include <Wire.h>
#include <LiquidCrystal_I2C.h>

// Inisialisasi LCD dengan alamat I2C 0x27 dan ukuran 16x2
LiquidCrystal_I2C lcd(0x27, 16, 2);

int Li = 17;
int Lii = 1;
int Ri = -1;
int Rii = -1;

void setup() {
  lcd.init();
  lcd.backlight();
}

void loop() {
  for (int i = 0; i <= 12; i++) {
    lcd.setCursor(0, 0);
    lcd.print(Scroll_LCD_Right("FMIPA"));
    delay(350);
  }
  for (int i = 0; i <= 50; i++) {
    lcd.setCursor(0, 1);
    lcd.print(Scroll_LCD_Right("Fisika 2023"));
    delay(350);
  }
  Clear_Scroll_LCD_Left();
  for (int i = 16; i <= 30; i++) {
    lcd.setCursor(0, 0);
    lcd.print(Scroll_LCD_Right("Fisika uhui"));
    delay(350);
  }
  Clear_Scroll_LCD_Right();
  for (int i = 0; i <= 12; i++) {
    lcd.setCursor(0, 1);
    lcd.print(Scroll_LCD_Left("Bisa UAS??"));
    delay(350);
  }
  for (int i = 13; i <= 24; i++) {
    lcd.setCursor(0, 0);
    lcd.print(Scroll_LCD_Right("Bentar lagi UAS"));
    delay(350);
  }
  Clear_Scroll_LCD_Right();
  for (int i = 13; i <= 24; i++) {
    lcd.setCursor(0, 0);
    lcd.print(Scroll_LCD_Right("Bisa deh"));
    delay(350);
  }
  Clear_Scroll_LCD_Right();
}

String Scroll_LCD_Left(String StrDisplay) {
  String result;
  String StrProcess = "                " + StrDisplay + "                ";
  result = StrProcess.substring(Li, Lii);
  Li++;
  Lii++;
  if (Li > StrProcess.length()) {
    Li = 16;
    Lii = 0;
  }
  return result;
}

void Clear_Scroll_LCD_Left() {
  Li = 16;
  Lii = 0;
}

String Scroll_LCD_Right(String StrDisplay) {
  String result;
  String StrProcess = "                " + StrDisplay + "                ";
  if (Rii < 1) {
    Ri = StrProcess.length();
    Rii = Ri - 16;
  }
  result = StrProcess.substring(Rii, Ri);
  Ri--;
  Rii--;
  return result;
}

void Clear_Scroll_LCD_Right() {
  Ri = -1;
  Rii = -1;
}