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eatSnake.html
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eatSnake.html
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<!DOCTYPE html>
<html>
<head>
<style>
#core {
border-collapse: collapse;
}
td {
width: 20px;
height: 20px;
border: 1px solid gray;
}
.snake {
background-color: red;
}
.food {
background-color: green;
}
</style>
</head>
<body>
<div>Please use the arrow keys (up, down, left, right) in the keyboard to control the snake (in red).<br>
Food is in green.</div>
<table id="core">
</table>
<script>
const row = 10, col = 10;
var interval, snakeCellNum = 22, snakeCell, foodCellNum, cells, directKey = 39;
function initBoard(){
var frag = document.createDocumentFragment();
for(let i = 0; i < row; i++){
let rowCon = document.createElement('tr');
for(let j = 0; j < col; j++){
rowCon.appendChild(document.createElement('td'));
}
frag.appendChild(rowCon);
}
document.getElementById('core').appendChild(frag);
cells = document.getElementsByTagName('td');
drawSnakeAndFood();
document.onkeydown = keydown;
}
function keydown(event){
console.log("keycode " + event.keyCode)
if(event.keyCode >= 37 && event.keyCode <= 40){
// Change dir
directKey = event.keyCode;
}
}
function drawSnakeAndFood(){
// Draw the snake
cells[snakeCellNum].classList.add('snake');
snakeCell = cells[snakeCellNum];
drawFood();
}
function drawFood(){
// Draw food
while(true){
let randomNum = Math.floor(Math.random() * row * col);
if(randomNum !== snakeCellNum){
foodCellNum = randomNum;
cells[foodCellNum].classList.add('food');
break;
}
}
}
function moveSnake(){
var dirs = [[0, -1], [0, 1], [-1, 0], [1, 0]];
var resetSnake = function(){
snakeCellNum = 22;
snakeCell = cells[snakeCellNum];
}
interval = setInterval(function(){
snakeCell.classList.remove('snake');
if(directKey === 39){
snakeCell = snakeCell.nextElementSibling;
if(snakeCell === null){
alert("Reach the wall");
resetSnake();
}
else{
snakeCellNum++;
}
}
else if(directKey === 37){
snakeCell = snakeCell.previousElementSibling;
if(snakeCell === null){
alert("Reach the wall");
resetSnake();
}
else{
snakeCellNum--;
}
}
else if(directKey === 38){
let siblingRow = snakeCell.parentElement.previousElementSibling;
if(siblingRow === null){
alert("Reach the wall");
resetSnake();
}
else{
snakeCell = siblingRow.children[snakeCellNum % col];
snakeCellNum -= col;
}
}
else{
let siblingRow = snakeCell.parentElement.nextElementSibling;
if(siblingRow === null){
alert("Reach the wall");
resetSnake();
}
else{
snakeCell = siblingRow.children[snakeCellNum % col];
snakeCellNum += col;
}
}
snakeCell.classList.add('snake');
// Eat food
if(snakeCellNum === foodCellNum){
console.log(snakeCellNum + " class " + snakeCell.classList);
//setTimeout(function(){
snakeCell.classList.remove('food');
drawFood();
//}, 200)
}
}, 400);
}
window.onload = function(){
initBoard();
moveSnake();
};
</script>
</body>
</html>