TicTacToe minimax AI in Javascript - javascript

I'm having trouble implementing this TicTacToe AI that I found here. I'm relatively new to javascript so I'm sure I'm doing something wrong with variable scoping.
The code wont run in the snippet but heres my codepen
choices = {
0: '#ul',
1: '#um',
2: '#ur',
3: '#ml',
4: '#mm',
5: '#mr',
6: '#ll',
7: '#lm',
8: '#lr'
}
function getGrid() {
var divs = []
for (var i = 0; i < 9; i++) {
divs.push($(choices[i]).html())
}
return divs
}
function getGame() {
var divs = []
for (var i = 0; i < 9; i++) {
divs.push([$(choices[i]).html(), i])
}
return divs
}
function convertGameToGrid(game) {
var divs = []
for (var i = 0; i < game.length; i++) {
divs.push(game[i][0])
}
return divs
}
function checkGrid(divs) {
var options = [
[divs[0], divs[1], divs[2]],
[divs[3], divs[4], divs[5]],
[divs[6], divs[7], divs[8]],
[divs[0], divs[3], divs[6]],
[divs[1], divs[4], divs[7]],
[divs[2], divs[5], divs[8]],
[divs[0], divs[4], divs[8]],
[divs[2], divs[4], divs[6]]
]
for (var i = 0; i < options.length; i++) {
if (options[i][0] == 'X' && options[i][1] == 'X' && options[i][2] == 'X') {
return 'X'
} else if (options[i][0] == 'O' && options[i][1] == 'O' && options[i][2] == 'O') {
return 'O'
}
}
for (var i = 0; i < 9; i++) {
if (divs[i] == '') {
return false //still moves
}
}
return 'Tie' //no winner and no moves
}
var player = 'O'
var ai = 'X'
$(document).ready(function() {
function playerTurn(i) {
return function() {
var g = getGrid()
var cG = checkGrid(g)
if (!cG) {
if ($(choices[i]).html() == '') {
$(choices[i]).html(player)
var g = getGrid()
var cG = checkGrid(g)
if (cG == player) {
console.log('You win')
} else if (cG == 'Tie') {
console.log('Tie')
} else {
aiTurn()
}
}
}
}
}
for (var i = 0; i < 9; i++) {
$(choices[i]).on('click', playerTurn(i));
}
function score(g, depth) {
var cG = checkGrid(g)
console.log(cG, g)
if (cG == ai) {
return 10 - depth
} else if (cG == player) {
return depth - 10
} else {
return 0
}
}
function minimax(game, depth) {
var g = convertGameToGrid(game)
if (checkGrid(g)) {
return score(g, depth)
}
depth += 1
var scores = []
var moves = []
var availMoves = getAvailMoves(game)
console.log('moves', availMoves)
for (var i = 0; i < availMoves.length; i++) {
var possibleGame = game
if (depth % 2 == 0) {
possibleGame[availMoves[i]][0] = ai
} else {
possibleGame[availMoves[i]][0] = player
}
var m = minimax(possibleGame, depth)
scores.push(m)
console.log('mm: ', depth, i, scores)
moves.push(availMoves[i])
}
//even depths are ai, odd are player
if (depth % 2 == 0) {
var max_score_index = 0
var max_score = -100000000
for (var i = 0; i < scores.length; i++) {
if (scores[i] > max_score) {
max_score_index = i
max_score = scores[i]
}
}
if (depth == 0) { //we need the best move
return moves[max_score_index]
} else { //otherwise this function needs scores
return scores[max_score_index]
}
} else {
var min_score_index = 0
var min_score = 100000000
for (var i = 0; i < scores.length; i++) {
if (scores[i] < min_score) {
min_score_index = i
min_score = scores[i]
}
}
return scores[max_score_index]
}
}
function getAvailMoves(game) {
var moves = []
for (var i = 0; i < game.length; i++) {
if (game[i][0] == '') {
moves.push(game[i][1])
}
}
return moves
}
function aiTurn() {
//Dumb ai
// c = Math.floor(Math.random()*9)
// while ($(choices[c]).html()) {
// c = Math.floor(Math.random()*9)
// }
//new strategy taken from http://neverstopbuilding.com/minimax
console.log('ai')
var c;
game = getGame()
c = minimax(game, -1)
$(choices[c]).html('X')
var g = getGrid()
var cG = checkGrid(g)
if (cG == ai) {
console.log('You lose')
} else if (cG == 'Tie') {
console.log('Tie')
}
}
})
#ttt-box {
position: relative;
height: 304px;
width: 304px;
margin: 30px auto;
background-color: #bbb;
border: solid #000 4px;
border-radius: 20%;
}
#l1,
#l2,
#l3,
#l4 {
position: absolute;
background-color: #000;
}
#l1 {
left: 99px;
width: 3px;
height: 296px;
}
#l2 {
left: 199px;
width: 3px;
height: 296px;
}
#l3 {
top: 99px;
width: 296px;
height: 3px;
}
#l4 {
top: 199px;
width: 296px;
height: 3px;
}
#ul,
#um,
#ur,
#ml,
#mm,
#mr,
#ll,
#lm,
#lr {
cursor: pointer;
position: absolute;
width: 99px;
height: 99px;
font-size: 70px;
text-align: center;
}
#ul {
top: 0;
left: 0;
}
#um {
top: 0;
left: 101px;
}
#ur {
top: 0;
left: 201px;
}
#ml {
top: 101px;
left: 0;
}
#mm {
top: 101px;
left: 101px;
}
#mr {
top: 101px;
left: 201px;
}
#ll {
top: 201px;
left: 0;
}
#lm {
top: 201px;
left: 101px;
}
#lr {
top: 201px;
left: 201px;
}
<body>
<div class="container">
<div id="content">
<div id="ttt-box">
<div id="l1"></div>
<div id="l2"></div>
<div id="l3"></div>
<div id="l4"></div>
<div id="boxes">
<div id="ul"></div>
<div id="um"></div>
<div id="ur"></div>
<div id="ml"></div>
<div id="mm"></div>
<div id="mr"></div>
<div id="ll"></div>
<div id="lm"></div>
<div id="lr"></div>
</div>
</div>
</div>
</div>
</body>
The code in particular that I think is breaking is the section below. After the first player's move, I think the console.log should print out 8! times because of all the different paths that should be taken, instead it only prints 8 times as if it went down a single path.
var availMoves = getAvailMoves(game)
console.log('moves',availMoves)
for (var i=0;i<availMoves.length;i++) {
var possibleGame = game
if (depth%2==0) {
possibleGame[availMoves[i]][0] = ai
} else {
possibleGame[availMoves[i]][0] = player
}
var m = minimax(possibleGame,depth)
scores.push(m)
console.log('mm: ', depth,i, scores)
moves.push(availMoves[i])
}
Edit: What I'm noticing is that sometimes the minimax recursion is returning undefined. I've tried finding why that is (see my codepen) but I've been unsuccessful.
Edit2: It appears to be returning undefined because it is completely skipping these recursions. I still can't find a way to fix this though.

First a suggestion, since you're just getting started: learn how to use the debugger. It will be invaluable in cases like these and most modern browsers have them built in.
Regarding your issue, I haven't traced through all your code but I did notice one thing that could be causing the problem in your minmax function. Towards the bottom of that function you have this code:
//even depths are ai, odd are player
if (depth % 2 == 0) {
var max_score_index = 0
// snip...
} else {
var min_score_index = 0
// snip...
return scores[max_score_index]
}
Note that you are declaring and assigning max_score_index in the if block, but also using it in the else block (without assigning it). That will cause it to return undefined from the else block.

Related

Why animation don't complete its path when duration is decreased by JavaScript

I have a animation whose duration decreases each time black jumps(using space) over the red, it works fine that subsequent jumps reduces the duration.
But after a certain decrease in time, say after reducing to 4s,3.9s,3.8s..., the animation don't start from the right-most end which is supposed to be. As it is decided path(110vw) in #keyframes animateVillan
Is there something I am doing wrong, first thought it is a glitch kind and decided to change duration only when red reaches less than 10 and tried below part
if (ourVillanFigXValue < 10) {
ourVillanFig.style.animationDuration = ourVillanAnimeDuration - 0.1 + "s";
}
But this didn't solve the problem and path is not completely traced by the red
Sorry have to jump a little, 4 or 5 jumps only to see the error plz
let ourHeroFig = document.getElementById("ourHero");
let ourVillanFig = document.getElementById("obstacleBar");
let gameScoreDigits = document.getElementById("gameScoreDigits");
let valueXCoordinate = "";
let obstacleBarCrossed = true;
document.body.addEventListener('keydown', function(e) {
let ourHeroFigXValue = parseInt(getComputedStyle(ourHeroFig).getPropertyValue('left'));
let ourHeroFigYValue = parseInt(getComputedStyle(ourHeroFig).getPropertyValue('bottom'));
if (e.code === "ArrowRight") {
valueXCoordinate = ourHeroFigXValue + 100;
} else if (e.code === "KeyA" || e.code === "ArrowLeft") {
if (ourHeroFigXValue > ourHeroFig.offsetWidth + 90) {
valueXCoordinate = ourHeroFigXValue - 100;
} else {
valueXCoordinate = 0;
}
} else if (e.code === "Space") {
ourHeroFig.classList.add("animateHero");
setTimeout(function() {
ourHeroFig.classList.remove("animateHero");
}, 700)
}
changePosition();
})
function changePosition() {
ourHeroFig.style.left = valueXCoordinate + 'px'
}
let delayInAnimeSub = ""
setInterval(
function() {
let ourHeroFigXValue = parseInt(getComputedStyle(ourHeroFig).getPropertyValue('left'));
let ourHeroFigYValue = parseInt(getComputedStyle(ourHeroFig).getPropertyValue('bottom'));
let ourVillanFigXValue = parseInt(getComputedStyle(ourVillanFig).getPropertyValue('left'));
let ourVillanFigYValue = parseInt(getComputedStyle(ourVillanFig).getPropertyValue('bottom'));
let gameOverValueX = Math.abs(ourVillanFigXValue - ourHeroFigXValue);
let gameOverValueY = Math.abs(ourVillanFigYValue - ourHeroFigYValue);
if (ourVillanFigXValue < 10) {
ourVillanFig.style.animationDuration = ourVillanAnimeDuration - 0.3 + "s";
}
if (gameOverValueX < ourVillanFig.offsetWidth && gameOverValueY < ourVillanFig.offsetHeight) {
console.log("yes touched");
ourVillanFig.classList.remove("animateVillan");
obstacleBarCrossed = false;
} else if (obstacleBarCrossed && gameOverValueX < ourVillanFig.offsetWidth) {
ourVillanAnimeDuration = parseFloat(getComputedStyle(ourVillanFig).getPropertyValue('animation-duration'));
console.log(ourVillanFigXValue < 0, ourVillanAnimeDuration)
if (ourVillanAnimeDuration <= 2) {
ourVillanAnimeDuration = 2
}
}
// console.log(gameOverValueX,gameOverValueY)
}, 10);
#ourHero {
width: 20px;
height: 180px;
background-color: black;
position: fixed;
bottom: 0;
left: 0;
transition: 0.1s;
}
.animateHero {
animation: animateHero 0.7s linear;
}
#keyframes animateHero {
0% {
bottom: 0;
}
50% {
bottom: 350px;
}
100% {
bottom: 0;
}
}
#obstacleBar {
width: 20px;
height: 180px;
background-color: red;
position: fixed;
bottom: 0;
left: 50vw;
}
.animateVillan {
animation: animateVillan 5s linear infinite;
}
#keyframes animateVillan {
0% {
left: 110vw;
}
100% {
left: 0;
}
}
<div id="ourHero"></div>
<div id="obstacleBar" class="animateVillan"></div>
Thanks for help in advance
First make the red thing starts from far right so change left: 50vw; to something like left: 110vw;. Also, instead of the infinite animation, just remove the animateVillan class after the red gets out of screen then re-add it again. Can be done by using an animationend event handler:
ourVillanFig.addEventListener('animationend', () => {
ourVillanFig.classList.remove('animateVillan')
ourVillanFig.clientHeight // just to cause a reflow
ourVillanFig.classList.add('animateVillan')
})
or maybe by checking its x position and see when it gets out.
Here is the result. It seems that it is working just fine without any glitches:
EDIT: To make the red stops where it is when it touches black, you can make the following css class:
.pauseVillan {
animation-play-state: paused;
}
and then when the red gets in touch just add the pauseVillan class to it:
ourVillanFig.classList.add('pauseVillan')
Here is the updated snippet:
let ourHeroFig = document.getElementById('ourHero')
let ourVillanFig = document.getElementById('obstacleBar')
let gameScoreDigits = document.getElementById('gameScoreDigits')
let valueXCoordinate = ''
let obstacleBarCrossed = true
document.body.addEventListener('keydown', function(e) {
let ourHeroFigXValue = parseInt(
getComputedStyle(ourHeroFig).getPropertyValue('left')
)
let ourHeroFigYValue = parseInt(
getComputedStyle(ourHeroFig).getPropertyValue('bottom')
)
if (e.code === 'ArrowRight') {
valueXCoordinate = ourHeroFigXValue + 100
} else if (e.code === 'KeyA' || e.code === 'ArrowLeft') {
if (ourHeroFigXValue > ourHeroFig.offsetWidth + 90) {
valueXCoordinate = ourHeroFigXValue - 100
} else {
valueXCoordinate = 0
}
} else if (e.code === 'Space') {
ourHeroFig.classList.add('animateHero')
setTimeout(function() {
ourHeroFig.classList.remove('animateHero')
}, 700)
}
changePosition()
})
ourVillanFig.addEventListener('animationend', () => {
ourVillanFig.classList.remove('animateVillan')
ourVillanFig.clientHeight // just to cause a reflow
ourVillanFig.classList.add('animateVillan')
})
function changePosition() {
ourHeroFig.style.left = valueXCoordinate + 'px'
}
let delayInAnimeSub = ''
setInterval(function() {
let ourHeroFigXValue = parseInt(
getComputedStyle(ourHeroFig).getPropertyValue('left')
)
let ourHeroFigYValue = parseInt(
getComputedStyle(ourHeroFig).getPropertyValue('bottom')
)
let ourVillanFigXValue = parseInt(
getComputedStyle(ourVillanFig).getPropertyValue('left')
)
let ourVillanFigYValue = parseInt(
getComputedStyle(ourVillanFig).getPropertyValue('bottom')
)
let gameOverValueX = Math.abs(ourVillanFigXValue - ourHeroFigXValue)
let gameOverValueY = Math.abs(ourVillanFigYValue - ourHeroFigYValue)
if (ourVillanFigXValue < 10) {
ourVillanFig.style.animationDuration =
ourVillanAnimeDuration - 0.3 + 's'
}
if (
gameOverValueX < ourVillanFig.offsetWidth &&
gameOverValueY < ourVillanFig.offsetHeight
) {
console.log('yes touched')
ourVillanFig.classList.add('pauseVillan')
obstacleBarCrossed = false
} else if (
obstacleBarCrossed &&
gameOverValueX < ourVillanFig.offsetWidth
) {
ourVillanAnimeDuration = parseFloat(
getComputedStyle(ourVillanFig).getPropertyValue('animation-duration')
)
console.log(ourVillanFigXValue < 0, ourVillanAnimeDuration)
if (ourVillanAnimeDuration <= 2) {
ourVillanAnimeDuration = 2
}
}
// console.log(gameOverValueX,gameOverValueY)
}, 10)
#ourHero {
width: 20px;
height: 180px;
background-color: black;
position: fixed;
bottom: 0;
left: 0;
transition: 0.1s;
}
.animateHero {
animation: animateHero 0.7s linear;
}
#keyframes animateHero {
0% {
bottom: 0;
}
50% {
bottom: 350px;
}
100% {
bottom: 0;
}
}
#obstacleBar {
width: 20px;
height: 180px;
background-color: red;
position: fixed;
bottom: 0;
left: 110vw;
}
.animateVillan {
animation: animateVillan 4s linear;
}
.pauseVillan {
animation-play-state: paused;
}
#keyframes animateVillan {
0% {
left: 110vw;
}
100% {
left: 0;
}
}
<div id="ourHero"></div>
<div id="obstacleBar" class="animateVillan"></div>

How to sort elements on DOM by its inner Text

I have a graph that is rendering its values as a div inside the body element with a class according to their number values. This is working fine. But next I need to sort the divs according to their number values or background color. BUT, it needs to start on the lower left corner of the page and fan out upwards to towards the right as the numbers increase. Basically just like a line graph.
I'd like to stay away from libraries if at all possible.
How would I approach this? Thank you all.
let interval = setInterval(makeDivs, 5);
function makeDivs(){
let cont = checkHeight();
if(cont){
let div = document.createElement('div');
let randNum = Math.random() * 100;
if(randNum < 20) { div.classList.add('blue') }
if(randNum >= 20 && randNum < 40) { div.classList.add('green') }
if(randNum >= 40 && randNum < 60) { div.classList.add('yellow') }
if(randNum >= 60 && randNum < 80) { div.classList.add('orange') }
if(randNum >= 80 && randNum < 101) { div.classList.add('red') }
div.textContent = randNum.toFixed(2);
document.querySelector('body').appendChild(div);
} else {
alert('done');
clearInterval(interval);
sortDivs(); // Begin sorting divs
}
}
function checkHeight(){
let w = window.innerHeight;
let b = document.querySelector('body').offsetHeight;
if(b < w) {
return true;
} else {
return false;
}
}
function sortDivs(){
document.querySelector("body div:last-child").remove();
alert('sorting now...')
}
* { box-sizing: border-box;}
body { width: 100vw; margin: 0; padding: 0; display: flex; flex-wrap: wrap; align-items: end;}
body div { width: calc(10% + 1px); text-align: center; border: 1px solid #ddd; margin: -1px 0 0 -1px; padding: 10px;}
body div.blue { background: aqua; }
body div.green { background: green; }
body div.yellow { background: yellow; }
body div.orange { background: orange; }
body div.red { background: red; }
UPDATE!!!
So I have this so far based on the feed back down below. The problem now is the sorting is only happening laterally and not on an angle (spreading right and to the top).
let interval = setInterval(makeDivs, 10);
function makeDivs(){
let cont = checkHeight();
if(cont){
let div = document.createElement('div');
let randNum = Math.random() * 100;
if(randNum < 20) { div.classList.add('blue') }
if(randNum >= 20 && randNum < 40) { div.classList.add('green') }
if(randNum >= 40 && randNum < 60) { div.classList.add('yellow') }
if(randNum >= 60 && randNum < 80) { div.classList.add('orange') }
if(randNum >= 80 && randNum < 101) { div.classList.add('red') }
div.textContent = randNum.toFixed(2);
document.querySelector('.outPut').appendChild(div);
} else {
clearInterval(interval);
document.querySelector(".outPut div:last-child").remove();
compileArrays(); // Begin sorting divs
}
}
function checkHeight(){
let w = window.innerHeight;
let b = document.querySelector('.outPut').offsetHeight;
if(b < w) {
return true;
} else {
return false;
}
}
function compileArrays(){
let divs = document.querySelectorAll('.outPut div');
let bArr = [], gArr = [], yArr = [], oArr = [], rArr = [];
divs.forEach( (d) => {
if( d.classList.contains('blue') ){ bArr.push(d) }
if( d.classList.contains('green') ){ gArr.push(d) }
if( d.classList.contains('yellow') ){ yArr.push(d) }
if( d.classList.contains('orange') ){ oArr.push(d) }
if( d.classList.contains('red') ){ rArr.push(d) }
});
let finalArr = sortArray(bArr).concat(sortArray(gArr)).concat(sortArray(yArr)).concat(sortArray(oArr)).concat(sortArray(rArr));
newDom(finalArr);
}
function sortArray(arr){
let newArr = arr;
newArr.sort( (a, b) => {
return a.innerText - b.innerText;
});
return newArr;
}
function newDom(arr){
let b = document.querySelector('.outPut');
b.innerHTML = '';
arr.reverse();
arr.forEach((a) => {
b.appendChild(a);
});
}
* { box-sizing: border-box;}
body { width: 100vw; height: 100vh; margin: 0; padding: 0; display: flex; align-items: flex-end;}
body .outPut { flex: 1; display: flex; flex-wrap: wrap; flex-direction:row-reverse; }
body .outPut div { width: calc(10% + 1px); text-align: center; border: 1px solid #ddd; margin: -1px 0 0 -1px; padding: 10px;}
body .outPut div.blue { background: aqua; }
body .outPut div.green { background: #44df15; }
body .outPut div.yellow { background: yellow; }
body .outPut div.orange { background: orange; }
body .outPut div.red { background: red; }
<div class="outPut"></div>
Supposed you already have a mechanism to organise such DIVs in a grid as shown, the following should give you what you are looking for:
var items = divList.filter((div) => div.nodeType == 1); // get rid of the whitespace text nodes
items.sort(function(a, b) {
return a.innerHTML == b.innerHTML
? 0
: (a.innerHTML > b.innerHTML ? 1 : -1);
});
Then, place them back in the DOM as needed, example:
for (i = 0; i < items.length; ++i) {
divList.appendChild(items[i]);
}
This worked with the first code example!!!
try this sortDivs function:
function sortDivs() {
document.querySelector("body div:last-child").remove();
alert('sorting now...')
let toSort = document.getElementsByTagName("div")
toSort = Array.prototype.slice.call(toSort, 0)
toSort.sort((a, b) => {
let aord = parseFloat(a.textContent);
let bord = parseFloat(b.textContent);
return bord - aord;
})
document.body.innerHTML = ""
for(var i = 0, l = toSort.length; i < l; i++) {
document.querySelector('body').appendChild(toSort[i]);
}
}
and in the css file set flex-wrap to wrap-reverse. Hope I could help :)
PS: please, implement some else if instead of doing only if
Here is a small fiddle with my sample code demonstrating a simple solution in pure JavaScript and absolute CSS positioning for what you are trying to achieve. Link
As some pointed out already, there might be a library, that already provides a better and complete solution for this - I did not research if it is so.
Code:
file.js
var container = document.getElementById("container")
var results = [1,2,3,4,5,6,7,8]
//you can pre-calculate the order of the distances
//here already orderdered array [distanec][X-axis][Y-axis]
var distances =[[0,0,0],
[1,1,0],
[1,0,1],
[1.414, 1,1],
[2,0,2],
[2,2,0],
[2.234, 2,1],
[2.234, 1,2]]
for (i = 0; i < results.length; i++){
var newDiv = document.createElement("div")
newDiv.className = "result"
newDiv.innerHTML = results[i]
newDiv.style.left = distances[i][1]*20 + "px"
newDiv.style.bottom = distances[i][2]*20 + "px"
container.appendChild(newDiv)
}
function setColor(element){
// set class based on value - you already have this part
}
style.css
#container {
border: 4px;
border-color: red;
border-style: solid;
height: 200px;
width: 200px;
position: relative;
}
.result{
border: 2px;
width: 20px;
height: 20px;
position: absolute;
border-color: blue;
border-style: solid;
text-align: center;
}
site.html
<div id="container">
</div>
Output:

i dont get why the baloons are not moving in the minigame i've built

I've built a small balloon game , trying to learn the foundations,
anyways I've successfully rendered balloons, i can see them both on the page however the move functions doesn't work,it should do so on page load that I've set in the index.html body(the startGame func) , code looks fine,however nothing happens.
var gNextId = 100
var gBaloons = createBalloons()
var gInterval = null
function startGame() {
renderBaloons();
gInterval = setInterval(() => {
moveBalloons();
}, 500);
}
function renderBaloons() {
var strHtml = ''
for (var i = 0; i < gBaloons.length; i++) {
var balloon = gBaloons[i]
strHtml += `
${balloon.txt}
`
}
document.querySelector('.balloon-container').innerHTML = strHtml
}
function moveballoons() {
var elballoons = document.querySelectorAll('.balloon')
for (var i = 0; i > gBaloons.length; i++) {
var balloon = gBaloons[i]
var elballoon = elballoons[i]
balloon.bottom += balloon.speed
elballoon.style.bottom = balloon.bottom + 'px'
}
if (balloon.bottom >= 800) clearInterval(gInterval)
}
function createBalloons() {
var ballons = [
createBalloon('A'),
createBalloon('B'),
createBalloon('C')
];
return ballons
}
function createBalloon(txt) {
return {
id: gNextId++,
bottom: 0,
speed: 45,
txt: txt
}
}
body {
background-color: lightblue;
}
.balloon {
position: absolute;
width: 170px;
height: 200px;
border-radius: 40%;
bottom: 0;
transition: 3s;
background-color: yellow;
text-align: center;
font-weight: bold;
}
.balloon1 {
left: 200px;
background-color: rgb(3, 61, 23);
}
.balloon2 {
left: 600px;
background-color: rgb(182, 24, 50);
}
.fade {
opacity: 0;
}
In the moveballoons() function the following line:
for (var i = 0; i > gBaloons.length; i++) {
Should be
for (var i = 0; i < gBaloons.length; i++) {
Note: I've swapped > with <
I couldn't the get example running, so there could well be other reasons as to why this is not working but that is definitely an issue.

stopping setTimeout loop in my snake game?

I've created a snake game, and when the snake hit the wall or itself, it still wont stop moving. I figured out if I used the clearTimeout(), it would help. but it didn't.
Is there a way to stop the loop? or it is another issue?
jQuery(document).ready(function($) {
init();
});
var move;
function init() {
board.initBoard();
drawSnake();
food.createFood();
}
function play() {
$('.newGame').css('visibility', 'hidden');
$('.playgame').css('visibility', 'hidden');
moveSnake();
getSnakeDir();
}
function gameover() {
clearTimeout(move);
$('.newGame').css('visibility', 'visible');
}
function playGame() {
$('#gameboard').empty();
$('.newGame').hide();
init();
play();
}
var board = {
DIM: 20,
initBoard: function() {
for (var i = 0; i < board.DIM; i++) {
var row = $('<div class="row-' + i + '"></div>');
for (var j = 0; j < board.DIM; j++) {
var col = ('<div class="col-' + j + '-' + i + '"></div>');
$(row).append(col);
}
$("#gameboard").append(row);
}
}
}
var snake = {
position: ['10-10', '10-11', '10-12'],
direction: 'r',
speed: 200,
};
function drawSnake() {
$('.col-10-10').addClass('snake');
$('.col-11-10').addClass('snake');
}
function getSnakeDir() {
$(document).keydown(function(event) {
//event.preventDefault();
if (event.which == 38) {
snake.direction = 'u';
} else if (event.which == 39) {
snake.direction = 'r';
} else if (event.which == 40) {
snake.direction = 'd';
} else if (event.which == 37) {
snake.direction = 'l';
}
});
}
function moveSnake() {
var tail = snake.position.pop();
$('.col-' + tail).removeClass('snake');
var coords = snake.position[0].split('-');
var x = parseInt(coords[0]);
var y = parseInt(coords[1]);
if (snake.direction == 'r') {
x = x + 1;
} else if (snake.direction == 'd') {
y = y + 1;
} else if (snake.direction == 'l') {
x = x - 1;
} else if (snake.direction == 'u') {
y = y - 1;
}
var currentcoords = x + '-' + y;
snake.position.unshift(currentcoords);
$('.col-' + currentcoords).addClass('snake');
//when snake eats food
if (currentcoords == food.coords) {
console.log('true');
$('.col-' + food.coords).removeClass('food');
snake.position.push(tail);
food.createFood();
}
//game over
if (x < 0 || y < 0 || x > board.DIM || y > board.DIM) {
gameover();
}
//if snake touch itself
if (hitItself(snake.position) == true) {
gameover();
}
move=setTimeout(moveSnake, 200);
}
var food = {
coords: "",
createFood: function() {
var x = Math.floor(Math.random() * (board.DIM-1)) + 1;
var y = Math.floor(Math.random() * (board.DIM-1)) + 1;
var fruitCoords = x + '-' + y;
$('.col-' + fruitCoords).addClass('food');
food.coords = fruitCoords;
},
}
function hitItself(array) {
var valuesSoFar = Object.create(null);
for (var i = 0; i < array.length; ++i) {
var value = array[i];
if (value in valuesSoFar) {
return true;
}
valuesSoFar[value] = true;
}
return false;
}
.buttonnewgame {
position: relative;
}
.newGame {
position: absolute;
top: 45%;
left: 25%;
padding: 15px;
font-size: 1em;
font-family: arial;
visibility: hidden;
}
.gameContainer{
width: 100%;
}
#gameboard {
background-color:#eee;
padding:3px;
}
.playgame {
position: absolute;
top: 45%;
left: 20%;
padding: 15px;
font-size: 1em;
font-family: arial;
}
/* styling the board */
div[class^='row'] {
height: 15px;
text-align: center;
}
div[class*='col']{
display: inline-block;
border: 1px solid grey;
width: 15px;
height: 15px;
}
/*display the snake*/
.snake {
background-color: blue;
z-index: 99;
}
.food {
background: red;
z-index: 99;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="game">
<div class="buttonnewgame">
<input type="button" name="new game" value="new game" class="newGame" onclick="playGame()" />
<button class="playgame" onclick="play()">Play Game</button>
<div class="gameContainer">
<div id="gameboard">
<!-- snake game in here -->
</div>
</div>
</div>
</div>
There were a few problems, but here is the 'working version' (there are more bugs).
1) I renamed drawSnake to createSnake. You weren't fully reinitializing the snake when you called init(). The snakes position was not being reset in the previous drawSnake method, so it would seem like the game was not playable.
After that there were 2 more bugs.
2) You have to return after you call gameOver or the game never really ends does it? Once you clear the timeout in gameover, you immediately set another Timeout for on the last line of moveSnake() because you didn't return once the game was over. That lead to weird results that made it seem like the game was unresponsive.
3) You were using a combination of visibility none or visible and $.hide(). $.hide() uses display: none, so when you tried to show it again with the visibility style change, its still display: none so the new game button would stop appearing.
My advice to any game coder is to learn how to separate the code that handles how the game works (logic of the game, how the clock ticks, initialization of game state, etc) , and how it is displayed (the html and css). Modeling the game logic after a cleanly written system is easy to read and debug. The code becomes harder to understand and modify when the display code is mixed in with game logic. In theory, our game should work perfectly without any kind of rendering. Then we could write a renderer that produces an HTML canvas, html DOM, text in the command line, or OpenGL.
Heres an old project I never finished that should illustrate a separation between model and view.
http://tando.us/ganix/ganix.htm
jQuery(document).ready(function($) {
init();
});
var move;
function init() {
board.initBoard();
createSnake();
food.createFood();
}
function play() {
$('.newGame').hide();
$('.playgame').hide();
moveSnake();
getSnakeDir();
}
function gameover() {
clearTimeout(move);
$('.newGame').show();
}
function playGame() {
$('#gameboard').empty();
$('.newGame').hide();
init();
play();
}
var board = {
DIM: 20,
initBoard: function() {
for (var i = 0; i < board.DIM; i++) {
var row = $('<div class="row-' + i + '"></div>');
for (var j = 0; j < board.DIM; j++) {
var col = ('<div class="col-' + j + '-' + i + '"></div>');
$(row).append(col);
}
$("#gameboard").append(row);
}
}
}
var snake = {
position: ['10-10', '10-11', '10-12'],
direction: 'r',
speed: 200,
};
function createSnake() {
$('.col-10-10').addClass('snake');
$('.col-11-10').addClass('snake');
snake.position = ['10-10', '10-11', '10-12'];
}
function getSnakeDir() {
$(document).keydown(function(event) {
//event.preventDefault();
if (event.which == 38) {
snake.direction = 'u';
} else if (event.which == 39) {
snake.direction = 'r';
} else if (event.which == 40) {
snake.direction = 'd';
} else if (event.which == 37) {
snake.direction = 'l';
}
});
}
function moveSnake() {
var tail = snake.position.pop();
$('.col-' + tail).removeClass('snake');
var coords = snake.position[0].split('-');
var x = parseInt(coords[0]);
var y = parseInt(coords[1]);
if (snake.direction == 'r') {
x = x + 1;
} else if (snake.direction == 'd') {
y = y + 1;
} else if (snake.direction == 'l') {
x = x - 1;
} else if (snake.direction == 'u') {
y = y - 1;
}
var currentcoords = x + '-' + y;
snake.position.unshift(currentcoords);
$('.col-' + currentcoords).addClass('snake');
//when snake eats food
if (currentcoords == food.coords) {
console.log('true');
$('.col-' + food.coords).removeClass('food');
snake.position.push(tail);
food.createFood();
}
//game over
if (x < 0 || y < 0 || x > board.DIM || y > board.DIM) {
gameover();
return;
}
//if snake touch itself
if (hitItself(snake.position) == true) {
gameover();
return;
}
move=setTimeout(moveSnake, 200);
}
var food = {
coords: "",
createFood: function() {
var x = Math.floor(Math.random() * (board.DIM-1)) + 1;
var y = Math.floor(Math.random() * (board.DIM-1)) + 1;
var fruitCoords = x + '-' + y;
$('.col-' + fruitCoords).addClass('food');
food.coords = fruitCoords;
},
}
function hitItself(array) {
var valuesSoFar = Object.create(null);
for (var i = 0; i < array.length; ++i) {
var value = array[i];
if (value in valuesSoFar) {
return true;
}
valuesSoFar[value] = true;
}
return false;
}
.buttonnewgame {
position: relative;
}
.newGame {
position: absolute;
top: 45%;
left: 25%;
padding: 15px;
font-size: 1em;
font-family: arial;
}
.gameContainer{
width: 100%;
}
#gameboard {
background-color:#eee;
padding:3px;
}
.playgame {
position: absolute;
top: 45%;
left: 20%;
padding: 15px;
font-size: 1em;
font-family: arial;
}
/* styling the board */
div[class^='row'] {
height: 15px;
text-align: center;
}
div[class*='col']{
display: inline-block;
border: 1px solid grey;
width: 15px;
height: 15px;
}
/*display the snake*/
.snake {
background-color: blue;
z-index: 99;
}
.food {
background: red;
z-index: 99;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="game">
<div class="buttonnewgame">
<input type="button" name="new game" value="new game" class="newGame" style="display:none;" onclick="playGame()" />
<button class="playgame" onclick="play()">Play Game</button>
<div class="gameContainer">
<div id="gameboard">
<!-- snake game in here -->
</div>
</div>
</div>
You could try not to initiate a new setTimeout call at the and of the moveSnake function, but instead using.
function play() {
$('.newGame').css('visibility', 'hidden');
$('.playgame').css('visibility', 'hidden');
move = setInterval(moveSnake, 200);
getSnakeDir();
}
and remove the
move = setTimeout(moveSnake, 200)
from the moveSnake function and do
function gameover() {
clearInterval(move);
$('.newGame').css('visibility', 'visible');
}

When clicked on a button that handles event more than one time setInterval goes crazy?

When I click in the automatic button (auto) more than once, which handles the setInterval method, the color Divs go crazy fast, now the reason is what I'm here for to know. This is the DEMO in jsfiddleDEMO OF COLOR DIVS WITH SETINTERVAL METHOD
Body:
<div id="placeDiv1">ok</div>
<button id="b1" onclick="forward()">Forward</button>
<button id="b2" onclick="backward()">Backward</button>
<button id="b3" onclick="skip2()">skip2</button>
<button id="b4" onclick="automatic()">auto</button>
<button id="b5" onclick="stop()">stop</button>
<script>
var myArray = ["black", "yellow", "green", "red", "blue", "blue", "black", "gray"];
var myArray1 = ["yellow", "blue", "green", "red", "green", "blue", "black", "gray"];
var i = 0;
document.getElementById("placeDiv").style.backgroundColor = myArray[i];
document.getElementById("placeDiv1").style.backgroundColor = myArray1[i];
forward = function () {
if (i == myArray.length - 1) {
i = 0;
} else {
i = i + 1;
}
document.getElementById("placeDiv1").style.backgroundColor = myArray1[i];
document.getElementById("placeDiv").style.backgroundColor = myArray[i];
};
skip2 = function () {
if (i == myArray.length - 4) {
i += 2;
alert("This is the iterator " + i)
} else if (i == 7) {
i = 0
} else {
i = i + 1;
};
document.getElementById("placeDiv1").style.backgroundColor = myArray1[i];
document.getElementById("placeDiv").style.backgroundColor = myArray[i];
};
backward = function () {
if (i == 0) {
i = myArray.length - 1;
i = myArray1.length - 1;
} else {
i = i - 1;
}
document.getElementById("placeDiv1").style.backgroundColor = myArray1[i];
document.getElementById("placeDiv").style.backgroundColor = myArray[i];
//
}
automatic = function () {
var m = setInterval(function () {
if (i == myArray.length - 1) {
i = 0;
} else {
i = i + 1;
}
document.getElementById("placeDiv1").style.backgroundColor = myArray1[i];
document.getElementById("placeDiv").style.backgroundColor = myArray[i];
}, 100);
stop = function () {
clearInterval(m)
};
};
</script>
CSS:
#placeDiv {
position: absolute;
left: 0px;
width: 100px;
height: 100px;
}
#placeDiv1 {
position: absolute;
left: 100px;
width: 100px;
height: 100px;
}
#b1 {
position: absolute;
top: 100px;
left: 0px
}
#b2 {
position: absolute;
top: 100px;
left: 80px
}
#b3 {
position: absolute;
top: 100px;
left: 170px
}
#b4 {
position: absolute;
top: 100px;
left: 270px
}
#b5 {
position: absolute;
top: 100px;
left: 320px
}
Just update the script like
var m=null;
automatic=function(){
clearInterval(m);
m = setInterval(function(){
if(i == myArray.length-1)
{i=0;}
else
{i=i+1;}
document.getElementById("placeDiv1").style.backgroundColor = myArray1[i];
document.getElementById("placeDiv").style.backgroundColor = myArray[i];
},100);
stop=function(){
clearInterval(m);
};
Check Fiddle
You need to Kill the setinterval when you call the function automatic and also need to define var m outside the function
I'm finding your code a bit confusing, but the way i see it, you are setting the interval multiple times. Each time you click the button, it creates another timer.
What you can do is set a variable to check if the timer is running, like so:
var running = false;
In your automatic() function, set running to true; and in stop(), set running to false.
Also in automatic(), only create the timer if it's not already running.
All together, we now have:
running = false;
automatic=function(){
if (!running) {
running = true;
var m = setInterval(function(){if(i == myArray.length-1)
{i=0;}
else
{i=i+1;}
document.getElementById("placeDiv1").style.backgroundColor = myArray1[i];
document.getElementById("placeDiv").style.backgroundColor = myArray[i];},100);
}
stop=function(){
clearInterval(m);
running = false};
Is it just me, or are you not closing the function properly as well?

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