The Unity script for DentaLab's Exam Assessment

ExamManager.cs

using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using UnityEngine;
using UnityEngine.UI;

public class ExamManager : MonoBehaviour
{
    [Tooltip("The Text for the question display")]
    public Text question;
    [Tooltip("The Text for the automatic evaluation display")]
    public Text evaluation;
    [Tooltip("The parents of the GameObjects containing each choice")]
    public GameObject a, b, c, d;
    [Tooltip("The Text for each choice")]
    public Text aText, bText, cText, dText;
    [Tooltip("The navigation Buttons")]
    public Button back, next;
    [Tooltip("The Sprites with backgrounds corresponding to selection and choice correctness")]
    public Sprite defaultImg, selectedImg, wrongImg, rightImg;
    [Tooltip("The parent GameObjects holding the Next Button and Submit Button respectively")]
    public GameObject nextObj, submit;

    bool submitted; // Tracks if the user has submnitted the exam
    string examFileName = "Exam1"; // The name of the .txt file
    int index; // Current question index
    string title; // The exams title
    // Question data: Question, A-D multiple choice questions, and correct answer
    List<Tuple<string, string, string, string, string, string>> questions;
    List<string> answers; // The students answers
    Button aBtn, bBtn, cBtn, dBtn; // Buttons A, B, C, D


    private void Start()
    {
        // Gets buttons
        aBtn = a.GetComponentInChildren<Button>();
        bBtn = b.GetComponentInChildren<Button>();
        cBtn = c.GetComponentInChildren<Button>();
        dBtn = d.GetComponentInChildren<Button>();

        // Adds button listeners
        back.onClick.AddListener(OnBack);
        next.onClick.AddListener(OnNext);
        aBtn.onClick.AddListener(OnSelectA);
        bBtn.onClick.AddListener(OnSelectB);
        cBtn.onClick.AddListener(OnSelectC);
        dBtn.onClick.AddListener(OnSelectD);
        submit.GetComponent<Button>().onClick.AddListener(OnSubmit);

        LoadExam(examFileName);
    }

    void LoadExam(string examFileName)
    {
        /*
         * Loads given exam from Assets/Assets/Exams directory
         */

        questions = new List<Tuple<string, string, string, string, string, string>>();
        index = 0;

        string contents = Directory.GetCurrentDirectory() + "/Assets/Assets/Exams/" + examFileName + ".txt";

        List<string> lines = File.ReadAllLines(contents).ToList();
        title = lines[0]; // Stores title

        // Stores question, its choices, and answer
        for (int i = 2; i < lines.Count; i += 8)
        {
            Tuple<string, string, string, string, string, string> question = new Tuple<string, string, string, string, string, string>(
                lines[i] + " " + lines[i+1],
                lines[i+2],
                lines[i+3],
                lines[i+4],
                lines[i+5],
                lines[i+6]
            );
            questions.Add(question);
        }

        // Fills current answers as blank
        answers = new List<string>(questions.Count);
        for (int i = 0; i < questions.Count; i++)
            answers.Add("");

        LoadQuestion();
    }

    void LoadQuestion()
    {
        /*
         * Loads question onto Canvas
         */

        // Displays question of current index
        Tuple<string, string, string, string, string, string> q = questions[index];
        question.text = q.Item1;
        aText.text = q.Item2.Substring(3, q.Item2.Count()-3);
        bText.text = q.Item3.Substring(3, q.Item3.Count()-3);
        cText.text = q.Item4.Substring(3, q.Item4.Count()-3);
        dText.text = q.Item5.Substring(3, q.Item5.Count()-3);

        ResetButtonColors();

        // Sets button to selected color if applicable
        if (answers[index].Equals("A"))
            SetAnswerButtonColors(a);
        else if (answers[index].Equals("B"))
            SetAnswerButtonColors(b);
        else if (answers[index].Equals("C"))
            SetAnswerButtonColors(c);
        else if (answers[index].Equals("D"))
            SetAnswerButtonColors(d);

        // Displays next or submit button
        if (index == questions.Count - 1)
        {
            nextObj.SetActive(false);
            submit.SetActive(true);
        } else
        {
            nextObj.SetActive(true);
            submit.SetActive(false);
        }
    }

    void ResetButtonColors()
    {
        // Resets button colors back to default
        a.GetComponentInChildren<Image>().sprite = defaultImg;
        b.GetComponentInChildren<Image>().sprite = defaultImg;
        c.GetComponentInChildren<Image>().sprite = defaultImg;
        d.GetComponentInChildren<Image>().sprite = defaultImg;
    }

    void SetAnswerButtonColors(GameObject multi)
    {
        // Sets button color to selected
        multi.GetComponentInChildren<Image>().sprite = selectedImg;
    }

    void OnBack()
    {
        // Goes to previous question
        if (index > 0)
            index--;

        if (submitted)
            LoadAnswer();
        else
            LoadQuestion();
    }

    void OnNext()
    {
        // Goes to next question
        if (index < questions.Count - 1)
            index++;

        if (submitted)
            LoadAnswer();
        else
            LoadQuestion();
    }

    void OnSelectA()
    {
        // Stores A as answer to question
        if (!submitted)
        {
            answers[index] = "A";
            ResetButtonColors();
            SetAnswerButtonColors(a);
        }
    }

    void OnSelectB()
    {
        // Stores B as answer to question
        if (!submitted)
        {
            answers[index] = "B";
            ResetButtonColors();
            SetAnswerButtonColors(b);
        }
    }

    void OnSelectC()
    {
        // Stores C as answer to question
        if (!submitted)
        {
            answers[index] = "C";
            ResetButtonColors();
            SetAnswerButtonColors(c);
        }
    }

    void OnSelectD()
    {
        // Stores D as answer to question
        if (!submitted)
        {
            answers[index] = "D";
            ResetButtonColors();
            SetAnswerButtonColors(d);
        }
    }

    void SetRightAnswer(GameObject multi)
    {
        // Sets color of button to correct (e.g. green)
        multi.GetComponentInChildren<Image>().sprite = rightImg;
    }

    void SetWrongAnswer(GameObject multi)
    {
        // Sets color of button to incorrect (e.g. red)
        multi.GetComponentInChildren<Image>().sprite = wrongImg;
    }

    void LoadAnswer()
    {
        /*
         * Loads answer onto Canvas
         */

        // Displays question and gets correct answer
        Tuple<string, string, string, string, string, string> q = questions[index];
        question.text = q.Item1;
        aText.text = q.Item2;
        bText.text = q.Item3;
        cText.text = q.Item4;
        dText.text = q.Item5;
        string correctChoice = q.Item6;

        ResetButtonColors();


        if (answers[index] == correctChoice) // Correct Answer Chosen
        {
            if (answers[index].Equals("A"))
                SetRightAnswer(a);
            else if (answers[index].Equals("B"))
                SetRightAnswer(b);
            else if (answers[index].Equals("C"))
                SetRightAnswer(c);
            else if (answers[index].Equals("D"))
                SetRightAnswer(d);
        } else // Incorrect Answer Chosen
        {
            // Display their answer
            if (answers[index].Equals("A"))
                SetWrongAnswer(a);
            else if (answers[index].Equals("B"))
                SetWrongAnswer(b);
            else if (answers[index].Equals("C"))
                SetWrongAnswer(c);
            else if (answers[index].Equals("D"))
                SetWrongAnswer(d);

            // Display correct answer
            if (correctChoice.Equals("A"))
                SetRightAnswer(a);
            else if (correctChoice.Equals("B"))
                SetRightAnswer(b);
            else if (correctChoice.Equals("C"))
                SetRightAnswer(c);
            else if (correctChoice.Equals("D"))
                SetRightAnswer(d);
        }
    }

    void OnSubmit()
    {
        submitted = true;

        // Next button is always available (not submit)
        nextObj.SetActive(true);
        submit.SetActive(false);

        // Counts correctly answered questions
        int correct = 0;
        for (int i = 0; i < questions.Count; i++)
        {
            if (answers[i].Equals(questions[i].Item6))
                correct++;
        }

        // Gives final evaluation and shows answers
        evaluation.text = correct.ToString() + "/" + questions.Count.ToString();
        index = 0;
        LoadAnswer();
    }
}