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full-snake-code.html
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full-snake-code.html
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<!DOCTYPE html>
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<title>Snake Game using HTML and Javascript - Studytonight</title>
<style>
.game-box {
text-align:center;
}
.game-info {
text-align:center;
font-family:arial;
line-height:24px;
}
body{
background: #181818;
color: white;
}
#game-status{
font-size: 2.5vh;
}
#game-over{
text-shadow: 0px 1px 1px white;
color: #B80F0A;
font-size: 3.5vh;
}
</style>
</head>
<body>
<div class="game-box"><canvas id="canvas" width="400" height="400"></canvas></div>
<div class="game-info">
<h1>Snake Game</h2>
<p id="game-status"></p>
<p id="game-score"></p>
</div>
<script>
let canvas, ctx, gameControl, gameActive;
// render X times per second
let x = 8;
const CANVAS_BORDER_COLOUR = 'white';
const CANVAS_BACKGROUND_COLOUR = " #202020";
const SNAKE_COLOUR = 'lightgreen';
const SNAKE_BORDER_COLOUR = 'white';
window.onload = function() {
canvas = document.getElementById("canvas");
ctx = canvas.getContext("2d");
document.addEventListener("keydown", keyDownEvent);
gameControl = startGame(x);
};
/* function to start the game */
function startGame(x) {
// setting gameActive flag to true
gameActive = true;
document.getElementById("game-status").innerHTML = "<h3>Game Started</h3>";
document.getElementById("game-score").innerHTML = "";
return setInterval(draw, 1000 / x);
}
function pauseGame() {
// setting gameActive flag to false
clearInterval(gameControl);
gameActive = false;
document.getElementById("game-status").innerHTML = "<small>Game Paused</small>";
}
function endGame(x) {
// setting gameActive flag to false
clearInterval(gameControl);
gameActive = false;
document.getElementById("game-status").innerHTML = "<h3 id='game-over'>Game Over!</h3>";
document.getElementById("game-score").innerHTML = "<h1>Score: " + x + "</h1>";
setTimeout(function(){
status = document.getElementById("game-over");
if(status.innerHTML = "Game Over!"){
document.getElementById("game-status").innerHTML = "<h2>Reloading Snake Game...</h2>";
location.reload();
}
},2000)
}
// game world
let gridSize = (tileSize = 20); // 20 x 20 = 400
let nextX = (nextY = 0);
// snake
let defaultTailSize = 3;
let tailSize = defaultTailSize;
let snakeTrail = [];
let snakeX = (snakeY = 10);
// apple
let appleX = (appleY = 15);
// draw
function draw() {
// move snake in next pos
snakeX += nextX;
snakeY += nextY;
// snake over game world?
if (snakeX < 0) {
snakeX = gridSize - 1;
}
if (snakeX > gridSize - 1) {
snakeX = 0;
}
if (snakeY < 0) {
snakeY = gridSize - 1;
}
if (snakeY > gridSize - 1) {
snakeY = 0;
}
//snake bite apple?
if (snakeX == appleX && snakeY == appleY) {
tailSize++;
appleX = Math.floor(Math.random() * gridSize);
appleY = Math.floor(Math.random() * gridSize);
}
// Select the colour to fill the canvas
ctx.fillStyle = CANVAS_BACKGROUND_COLOUR;
// Select the colour for the border of the canvas
ctx.strokestyle = CANVAS_BORDER_COLOUR;
// Draw a "filled" rectangle to cover the entire canvas
ctx.fillRect(0, 0, canvas.width, canvas.height);
// Draw a "border" around the entire canvas
ctx.strokeRect(0, 0, canvas.width, canvas.height);
// paint snake
ctx.fillStyle = SNAKE_COLOUR;
ctx.strokestyle = SNAKE_BORDER_COLOUR;
for (let i = 0; i < snakeTrail.length; i++) {
ctx.fillRect(
snakeTrail[i].x * tileSize,
snakeTrail[i].y * tileSize,
tileSize,
tileSize
);
ctx.strokeRect(snakeTrail[i].x * tileSize , snakeTrail[i].y* tileSize, tileSize, tileSize);
//snake bites it's tail?
if (snakeTrail[i].x == snakeX && snakeTrail[i].y == snakeY) {
if(tailSize > 3) {
endGame(tailSize);
}
tailSize = defaultTailSize;
}
}
// paint apple
ctx.fillStyle = "red";
ctx.fillRect(appleX * tileSize, appleY * tileSize, tileSize, tileSize);
//set snake trail
snakeTrail.push({ x: snakeX, y: snakeY });
while (snakeTrail.length > tailSize) {
snakeTrail.shift();
}
}
// input
function keyDownEvent(e) {
switch (e.keyCode) {
case 37:
nextX = -1;
nextY = 0;
break;
case 38:
nextX = 0;
nextY = -1;
break;
case 39:
nextX = 1;
nextY = 0;
break;
case 40:
nextX = 0;
nextY = 1;
break;
case 32:
if(gameActive == true) {
pauseGame();
}
else {
gameControl = startGame(x);
}
break;
}
}
</script>
</body>
</html>