moodle-mod_game/export/html/snakes/js/snakes-mod.js

/* This code was originally based on code by
Husain Limdiyawala(MSc IT DA-IICT) */

// Global Variables.
var totblocks = 0;
var data = "";
var currentblock = 0;
var lastposition = new Array();
var randomno = 0;
var tots = new Array();
var l = 0;
var srcsnake = new Array(4);
var destsnake = new Array(4);

var ladsrc = new Array(3);
var laddest = new Array(3);
var quest = new Array(); // Available questions along with multiple answers.
var coranswered = new Array(); // Record all questions (along with answers) the user responded CORRECTLY.
var wroanswered = new Array(); // Record all questions (along with answers) the user responded WRONGLY.
var user = new Array();

// Constract table with questions and answers and pick question to display.

quest[0] = "Spell 1";
quest[1] = "one";
quest[2] = "two";
quest[3] = "three";
quest[4] = "Spell 2";
quest[5] = "two";
quest[6] = "three";
quest[7] = "four";
quest[8] = "Spell 3";
quest[9] = "three";
quest[10] = "two";
quest[11] = "four";
quest[12] = "Spell 4";
quest[13] = "four";
quest[14] = "three";
quest[15] = "one";

var z = 0;
var allQuest;

for (;;) {
    if (quest[z] === null) {
        break;
    }
}
allQuest = z / 4;

function selectQuest(all) {
    pickOne = Math.floor((Math.random() * all));
    return pickOne;
}

// The Below Function will hide all the snakes.

function hideAll() {
    document.getElementById("img1").style.display = "none";
    document.getElementById("img2").style.display = "none";
    document.getElementById("img3").style.display = "none";
    document.getElementById("img4").style.display = "none";

    document.getElementById("lad1").style.display = "none";
    document.getElementById("lad2").style.display = "none";
    document.getElementById("lad3").style.display = "none";
}

// The Below Function will Render The Main Board.

function paintBoard(a) {
    var j;

    totblocks = (a * a);
    if ((a * a) % 2 == 0) {
        currentblock = (a * a) - a + 1;
        for (j = 0; j < (a / 2); j++) {
            for (i = 0; i < a; i++) {
                data += "<div class='blocks' id='" + currentblock + "'>" + currentblock + "</div>";
                currentblock++;
            }
            currentblock -= (a + 1);

            for (i = 0; i < a; i++) {
                data += "<div id='" + currentblock + "' class ='blocks'>" + currentblock + "</div>";
                currentblock--;
            }
            currentblock -= (a - 1);
        }
    } else {
        currentblock = (a * a);
        for (j = 0; j < (a / 2); j++) {
            for (i = 0; i < a; i++) {
                data += "<div class='blocks' id='" + currentblock + "'>" + currentblock + "</div>";
                currentblock--;
            }

            currentblock -= (a - 1);

            if (currentblock < 2) {
                break;
            }

            for (i = 0; i < a; i++) {
                data += "<div id='" + currentblock + "' class ='blocks'>" + currentblock + "</div>";
                currentblock++;
            }
            currentblock -= (a + 1);
        }
    }
    document.getElementById("cont").style.width = (a * 52 + 52) + "px"

    document.getElementById("cont").innerHTML = data;
    $("#cont").slideDown( "slow");
    $("#cont").effect( "shake",3000);
    $("img:hidden").fadeIn( 5000);

    if (a == 6) {
        registerSnake(158, 196, "img1", 14, 3, 0);
        registerSnake(62, 183, "img2", 27, 24, 1);
        registerSnake(175, 18, "img3", 18, 4, 2);
        registerSnake(10, 45, "img4", 32, 23, 3);

        registerLadder(27, 132, "lad1", 28, 34, 0);
        registerLadder(90, 22, "lad2", 19, 30, 1);
        registerLadder(179, 137, "lad3", 2, 16, 2);
    } else if (a == 8) {
        registerSnake(300, 380, "img1", 44, 29, 0);
        registerSnake(180, 550, "img2", 51, 46, 1);
        registerSnake(290, 50, "img3", 41, 40, 2);
        registerSnake(500, 280, "img4", 27, 22, 3);

        registerLadder(350, 515, "lad1", 19, 35, 0);
        registerLadder(180, 230, "lad2", 43, 54, 1);
        registerLadder(80, 350, "lad3", 53, 60, 2);
    }
}

// The below Function will simulate throwing of a dice.
function throwDice(i) {
    randomno = Math.floor((Math.random() * 6)) + 1;
    document.getElementById("diceimg").src = "images/dice_" + randomno + ".PNG";
    document.getElementById("diceimg").style.display = "block";
    if (lastposition[i] > 0) {
        document.getElementById(lastposition[i]).style.background = "url(images/square52.png)";
    }
    tots[i] += randomno;

    if (totblocks - tots[i] >= 0) {
        lastposition[i] = tots[i];
        document.getElementById(tots[i]).style.background = "url(images/pawn1.png)";
    } else {
        tots[i] -= randomno;
        document.getElementById(tots[i]).style.background = "url(images/pawn1.png)";
    }
}

// The below Function Checks The Snake Biting for a user.
function snakescheck(k) {
    var i;

    for(i = 0; i <= srcsnake.length; i++) {
        if (srcsnake[i] == tots[k]) {
            alert("Ωχ! Σε τσίμπησε φίδι στο τετράγωνο " + srcsnake[i] + " και θα πρέπει να γυρίσεις στο τετράγωνο " + destsnake[i] + ", εκτός κι αν απαντήσεις σωστά στην ερώτηση που ακολουθεί.");
            document.getElementById(destsnake[i]).style.background = "url(images/pawn1.png)";
            document.getElementById(tots[k]).style.background = "url(images/square52.png)";
            lastposition[k] = destsnake[i];
            tots[k] = destsnake[i];
            break;
        }
    }

    if (!checkWin(k)) {
        alert("???d?se?!S???a??t???a!");
    }
}

// The below function checks the ladders for a user.
function laddercheck(k) {
    var i;

    for(i = 0; i <= ladsrc.length; i++) {
        if (ladsrc[i] == tots[k]) {
            alert("Υπάρχει μια σκάλα στο τετράγωνο " + ladsrc[i] + " και θα σας οδηγήσει κατευθείαν στο τετράγωνο " + laddest[i] + "αν απαντήσεις σωστά στην ερώτηση που ακολουθεί.");
            document.getElementById(laddest[i]).style.background = "url(images/pawn1.png)";
            document.getElementById(tots[k]).style.background = "url(images/square52.png)";
            lastposition[k] = laddest[i];
            tots[k] = laddest[i];
            break;
        }
    }
    if(!checkWin(k)) {
        alert("You have won!");
    }
}

// The below function will register a snake.
function registerSnake(tp, lft, dv, src, dest, i) {
    document.getElementById(dv).style.top = tp + "px";
    document.getElementById(dv).style.left = lft + "px";
    srcsnake[i] = src;
    destsnake[i] = dest;
}

// The below function will register a ladder.
function registerLadder(tp, lft, dv, src, dest, i) {
    document.getElementById(dv).style.top = tp + "px";
    document.getElementById(dv).style.left = lft + "px";
    ladsrc[i] = src;
    laddest[i] = dest;
}

// The below function checks the change in the boardtype selection combobox.
function selectBoard() {
    totblocks = 0;
    data = "";
    currentblock = 0;

    hideAll();
    if (document.getElementById("boardtype").value != null) {
        paintBoard(parseInt(document.getElementById("boardtype").value));
    }
}

// The below function checks the change in the player selection combobox.
function selectPlayer() {
    if (document.getElementById("players").value != null) {
        user[document.getElementById("players").value - 1] = 0;
        tots[document.getElementById("players").value - 1] = 0;
        lastposition[document.getElementById("players").value - 1] = 0;
        for(var j = 0; j < lastposition.length; j++) {
            lastposition[j] = 0;
            tots[j] = 0;
        }
    }
}

// The below function starts the play.
function play() {
    if (tots[l] != null) {
        var s;

        s = "<ul class='nodis'><li>O Paiktis " + (l + 1);
        s = s + " </li><li>brisketai sto tetragwno " + tots[l] + "</li><li></li></ul>";
        disableField();
        document.getElementById("status").innerHTML = s;

        question();
        s = "<ul class='nodis'><li>O Paiktis " + (l + 1);
        s = s + " </li><li>vrisketai sto tetragwno " + tots[l] + "</li></ul>";
        document.getElementById("status").innerHTML = s;
    } else {
        document.getElementById("status").innerHTML = "<ul class='nodis'><li>Molis exases...</li></ul>";
    }

    if( l == lastposition.length - 1) {
        l = 0;
    } else {
        l++;
    }
}

// The below function regulates the play.
function doit(i) {
    throwDice(i);
    if (checkWin(i)) {
        snakescheck(i);
        laddercheck(i);
    } else {
        alert("Congatulations!!!");
    }
}

// The below function checks whether the player has won or not.
function checkWin(i) {
    if (tots[i] == totblocks) {
        return false;
    } else {
        return true;
    }
}

// The below function will disable both the combobox .
function disableField() {
    document.getElementById("players").disabled = "disabled";
    document.getElementById("boardtype").disabled = "disabled";
}

function question() {
    var picked, q1;

    picked = selectQuest(allQuest);
    alert("Randomly selected number:" + picked);
    q1 = prompt(quest[picked * 4], "Απάντηση");
    if (q1 == quest[picked * 4 + 1]) {
        alert("Σωστά!")
        doit(l);

        coranswered.concat(quest.splice(picked * 4, 4));
    } else {
        alert("Η απάντηση δεν ήταν σωστή. Χάνεις τη σειρά σου για αυτό το γύρο!")
        wroanswered.concat(quest.splice(picked * 4, 4));
    }

    // Remove question and answers from available questions - (thus not allowing to have a Repeated question).
    allQuest--;
}