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2048.js
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2048.js
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var rTileCoord = 0;
var rTileValue = 0;
var prevTileValue;
var r1s1;
var r1s2;
var r1s3;
var r1s4;
var filledTile;
var carry = [];
var index;
var carryLength;
var carryLengthMod;
var counter;
var startGame = false;
var winState = 0;
var startButton;
var resetButton;
var startText;
var resetText;
//adds event listener to window object and sets up board
function load() {
window.addEventListener('keydown', getKey, false);
startButton = document.createElement('button');
startButton.setAttribute('id', 'start');
startText = document.createTextNode('Start Button');
startButton.appendChild(startText);
startButton.addEventListener('click', function () {
buttonSwap();
});
resetButton = document.createElement('button');
resetButton.setAttribute('id', 'reset');
resetText = document.createTextNode('Reset Button');
resetButton.appendChild(resetText);
resetButton.addEventListener('click', function () {
buttonSwap();
});
document.getElementById('buttons').appendChild(startButton);
}
//flips which button is active
function buttonSwap() {
if (startGame == false) {
randomTile();
randomTile();
startGame = true;
var remove = document.getElementById('buttons');
remove.removeChild(remove.childNodes[1]);
document.getElementById('buttons').appendChild(resetButton);
document.getElementById('notify').innerHTML = 'Game Started.'
} else if (startGame == true) {
startGame = false;
remove = document.getElementById('buttons');
remove.removeChild(remove.childNodes[1]);
document.getElementById('buttons').appendChild(startButton);
reset();
}
}
//runs the function related to the key pressed
function getKey(keyValue) {
if (keyValue.keyCode == 37 && winState == 0 && startGame == true) {
left();
} else if (keyValue.keyCode == 38 && winState == 0 && startGame == true) {
up();
} else if (keyValue.keyCode == 39 && winState == 0 && startGame == true) {
right();
} else if (keyValue.keyCode == 40 && winState == 0 && startGame == true) {
down();
}
}
//runs the left Arrow code
function left() {
//row 1
moveTilesL(0, 1, 2, 3, 4, 5);
//row 2
moveTilesL(4, 5, 6, 7, 8, 9);
//row 3
moveTilesL(8, 9, 10, 11, 12, 13);
//row 4
moveTilesL(12, 13, 14, 15, 16, 17);
randomTile();
winScan();
}
//runs the right Arrow code
function right() {
//row 1
moveTilesR(0, 1, 2, 3, 4, 5);
//row 2
moveTilesR(4, 5, 6, 7, 8, 9);
//row 3
moveTilesR(8, 9, 10, 11, 12, 13);
//row 4
moveTilesR(12, 13, 14, 15, 16, 17);
randomTile();
winScan();
}
//runs the up Arrow code
function up() {
//column 1
moveTilesU(1, 5, 9, 13);
//column 2
moveTilesU(2, 6, 10, 14);
//column 3
moveTilesU(3, 7, 11, 15);
//column 4
moveTilesU(4, 8, 12, 16);
randomTile();
winScan();
}
//runs the down Arrow code
function down() {
//column 1
moveTilesD(1, 5, 9, 13);
//column 2
moveTilesD(2, 6, 10, 14);
//column 3
moveTilesD(3, 7, 11, 15);
//column 4
moveTilesD(4, 8, 12, 16);
randomTile();
winScan();
}
//generates a random tile when called
function randomTile() {
rTileCoord = Math.floor(Math.random() * 16) + 1;
rTileValue = Math.floor(Math.random() * 4) + 1;
prevTileValue = document.getElementById(rTileCoord).innerHTML;
if (prevTileValue != '') {
randomTile();
}
if (rTileValue <= 3) {
document.getElementById(rTileCoord).innerHTML = 2;
} else if (rTileValue == 4) {
document.getElementById(rTileCoord).innerHTML = 4;
}
}
//moves all parametered tiles to the left
function moveTilesL(a, b, c, d, e, f) {
r1s1 = Number(document.getElementById(b).innerHTML);
r1s2 = Number(document.getElementById(c).innerHTML);
r1s3 = Number(document.getElementById(d).innerHTML);
r1s4 = Number(document.getElementById(e).innerHTML);
carry.push(r1s1, r1s2, r1s3, r1s4);
for (var i = b; i < f; i++) {
document.getElementById(i).innerHTML = '';
}
for (var i = a; i < e; i++) {
index = carry.indexOf(0);
if (carry[index] == 0) {
carry.splice(index, 1);
}
}
if (carry[0] == carry[1] && carry[0] > 0) {
carry[0] = carry[0] + carry[1];
carry[1] = 0;
} else if (carry[1] == carry[2] && carry[1] > 0) {
carry[1] = carry[1] + carry[2];
carry[2] = 0;
} else if (carry[2] == carry[3] && carry[2] > 0) {
carry[2] = carry[2] + carry[3];
carry[3] = 0;
}
for (var i = a; i < e; i++) {
index = carry.indexOf(0);
if (carry[index] == 0) {
carry.splice(index, 1);
}
}
counter = 0;
carryLength = carry.length
carryLengthMod = b + carry.length;
for (var i = b; i < carryLengthMod; i++) {
document.getElementById(i).innerHTML = carry[counter];
counter = counter + 1;
}
carry = [];
}
//moves all parametered tiles to the right
function moveTilesR(a, b, c, d, e, f) {
r1s1 = Number(document.getElementById(b).innerHTML);
r1s2 = Number(document.getElementById(c).innerHTML);
r1s3 = Number(document.getElementById(d).innerHTML);
r1s4 = Number(document.getElementById(e).innerHTML);
carry.push(r1s1, r1s2, r1s3, r1s4);
for (var i = b; i < f; i++) {
document.getElementById(i).innerHTML = '';
}
for (var i = a; i < e; i++) {
index = carry.indexOf(0);
if (carry[index] == 0) {
carry.splice(index, 1);
}
}
if (carry[0] == carry[1] && carry[0] > 0) {
carry[0] = carry[0] + carry[1];
carry[1] = 0;
} else if (carry[1] == carry[2] && carry[1] > 0) {
carry[1] = carry[1] + carry[2];
carry[2] = 0;
} else if (carry[2] == carry[3] && carry[2] > 0) {
carry[2] = carry[2] + carry[3];
carry[3] = 0;
}
for (var i = a; i < e; i++) {
index = carry.indexOf(0);
if (carry[index] == 0) {
carry.splice(index, 1);
}
}
if (carry.length == 4) {
} else if (carry.length == 3) {
carry.unshift('');
} else if (carry.length == 2) {
carry.unshift('');
carry.unshift('');
} else if (carry.length == 1) {
carry.unshift('');
carry.unshift('');
carry.unshift('');
}
counter = 0;
carryLength = carry.length;
carryLengthMod = b + carry.length;
for (var i = b; i < carryLengthMod; i++) {
document.getElementById(i).innerHTML = carry[counter];
counter = counter + 1;
}
carry = [];
}
//moves all parametered tiles up
function moveTilesU(a, b, c, d) {
//1 5 9 13
r1s1 = Number(document.getElementById(a).innerHTML);
r1s2 = Number(document.getElementById(b).innerHTML);
r1s3 = Number(document.getElementById(c).innerHTML);
r1s4 = Number(document.getElementById(d).innerHTML);
carry.push(r1s1, r1s2, r1s3, r1s4);
document.getElementById(a).innerHTML = '';
document.getElementById(b).innerHTML = '';
document.getElementById(c).innerHTML = '';
document.getElementById(d).innerHTML = '';
for (var i = 0; i < 4; i++) {
index = carry.indexOf(0);
if (carry[index] == 0) {
carry.splice(index, 1);
}
}
if (carry[0] == carry[1] && carry[0] > 0) {
carry[0] = carry[0] + carry[1];
carry[1] = 0;
} else if (carry[1] == carry[2] && carry[1] > 0) {
carry[1] = carry[1] + carry[2];
carry[2] = 0;
} else if (carry[2] == carry[3] && carry[2] > 0) {
carry[2] = carry[2] + carry[3];
carry[3] = 0;
}
for (var i = 0; i < 4; i++) {
index = carry.indexOf(0);
if (carry[index] == 0) {
carry.splice(index, 1);
}
}
if (carry.length == 1) {
document.getElementById(a).innerHTML = carry[0];
} else if (carry.length == 2) {
document.getElementById(a).innerHTML = carry[0];
document.getElementById(b).innerHTML = carry[1];
} else if (carry.length == 3) {
document.getElementById(a).innerHTML = carry[0];
document.getElementById(b).innerHTML = carry[1];
document.getElementById(c).innerHTML = carry[2];
} else if (carry.length == 4) {
document.getElementById(a).innerHTML = carry[0];
document.getElementById(b).innerHTML = carry[1];
document.getElementById(c).innerHTML = carry[2];
document.getElementById(d).innerHTML = carry[3];
}
carry = [];
}
//moves all parametered tiles down
function moveTilesD(a, b, c, d) {
r1s1 = Number(document.getElementById(d).innerHTML);
r1s2 = Number(document.getElementById(c).innerHTML);
r1s3 = Number(document.getElementById(b).innerHTML);
r1s4 = Number(document.getElementById(a).innerHTML);
carry.push(r1s1, r1s2, r1s3, r1s4);
document.getElementById(a).innerHTML = '';
document.getElementById(b).innerHTML = '';
document.getElementById(c).innerHTML = '';
document.getElementById(d).innerHTML = '';
for (var i = 0; i < 4; i++) {
index = carry.indexOf(0);
if (carry[index] == 0) {
carry.splice(index, 1);
}
}
if (carry[0] == carry[1] && carry[0] > 0) {
carry[0] = carry[0] + carry[1];
carry[1] = 0;
} else if (carry[1] == carry[2] && carry[1] > 0) {
carry[1] = carry[1] + carry[2];
carry[2] = 0;
} else if (carry[2] == carry[3] && carry[2] > 0) {
carry[2] = carry[2] + carry[3];
carry[3] = 0;
}
for (var i = 0; i < 4; i++) {
index = carry.indexOf(0);
if (carry[index] == 0) {
carry.splice(index, 1);
}
}
if (carry.length == 1) {
document.getElementById(d).innerHTML = carry[0];
} else if (carry.length == 2) {
document.getElementById(d).innerHTML = carry[0];
document.getElementById(c).innerHTML = carry[1];
} else if (carry.length == 3) {
document.getElementById(d).innerHTML = carry[0];
document.getElementById(c).innerHTML = carry[1];
document.getElementById(b).innerHTML = carry[2];
} else if (carry.length == 4) {
document.getElementById(d).innerHTML = carry[0];
document.getElementById(c).innerHTML = carry[1];
document.getElementById(b).innerHTML = carry[2];
document.getElementById(a).innerHTML = carry[3];
}
carry = [];
}
//winscan
function winScan() {
var counter = 0;
winState = 0;
for (var i = 1; i < 17; i++) {
if (document.getElementById(i).innerHTML > 0) {
counter = counter + 1;
}
if (document.getElementById(i).innerHTML == 2048) {
winState = 2;
}
}
if (counter == 16 && winState == 0) {
winState = 1;
} else {
counter = 0;
}
if (winState == 1) {
document.getElementById('notify').innerHTML = 'You lose.';
} else if (winState == 2) {
document.getElementById('notify').innerHTML = 'You win!';
}
}
//resets board and conditional variables
function reset() {
for (var i = 1; i < 17; i++) {
document.getElementById(i).innerHTML = '';
}
winState = 0;
start = false;
document.getElementById('notify').innerHTML = 'This will notify you of events in the game.';
}