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snake.html
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<!DOCTYPE html>
<html>
<style>
html, body, #container {
height: 100%;
width: 100%;
padding: 0;
margin: 0;
background-color: black;
}
body, #container, #canvas {
overscroll-behavior: contain;
}
#pause-button {
position: fixed;
top: 15px;
right: 15px;
padding: 5px;
color: white;
background: none;
border: none;
outline: none;
}
#score-label {
position: fixed;
top: 15px;
left: 15px;
padding: 5px;
color: white;
border: none;
background: none;
font-family: Helvetica;
}
#container {
display: flex;
align-items: center;
justify-content: center;
}
#canvas {
border: 1px solid white;
box-sizing: border-box;
}
</style>
<head>
<meta charset="utf-8">
<title>Snake</title>
<meta name="author" content="Kian Kasad">
<meta name="description" content="A snake game written in pure JavaScript">
<link rel="icon" type="image/bmp" href="icon.bmp" />
<link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
<script>
window.addEventListener("load", main);
// Canvas:
var canvas;
var ctx;
var pauseButton;
var scorelabel;
// Game:
var timer;
var fps = 10;
// Board:
var ts = 20;
var gw = gh = 20;
// Snake:
var vx = vy = 0;
var sx = sy = 10;
var px = py = 10;
var tail = 5;
var trail = [];
// Apple:
var ax = ay = 15;
var score = 0;
// Swipe gestures:
var xdown = ydown = null;
function main() {
canvas = document.getElementById("canvas");
ctx = canvas.getContext("2d");
pauseButton = document.getElementById("pause-button");
scorelabel = document.getElementById("score-label");
resizegame();
sx = Math.floor(gw / 2);
sy = Math.floor(gh / 2);
window.addEventListener("resize", resizegame);
document.addEventListener("keydown", keypress);
canvas.addEventListener("touchstart", touchdown, false);
canvas.addEventListener("touchmove", touchmove, false);
pauseButton.addEventListener("click", togglepause);
start();
}
function touchdown(e) {
const firsttouch = e.touches[0];
xdown = firsttouch.clientX;
ydown = firsttouch.clientY;
}
function touchmove(e) {
if (!xdown || !ydown) {
return;
}
var xup = e.touches[0].clientX;
var yup = e.touches[0].clientY;
var xdiff = xdown - xup;
var ydiff = ydown - yup;
var direction;
if (Math.abs(xdiff) > Math.abs(ydiff)) {
if (xdiff > 0) {
direction = "left";
} else {
direction = "right";
}
} else {
if (ydiff > 0) {
direction = "up";
} else {
direction = "down";
}
}
handleSwipe(direction);
xdown = ydown = null;
}
function handleSwipe(direction) {
switch (direction) {
case "left":
if (vx != 0) {
break;
}
vx = -1;
vy = 0;
break;
case "up":
if (vy != 0) {
break;
}
vx = 0;
vy = -1;
break;
case "right":
if (vx != 0) {
break;
}
vx = 1;
vy = 0;
break;
case "down":
if (vy != 0) {
break;
}
vx = 0;
vy = 1;
break;
}
}
function start() {
tail = 5;
trail = []
px = sx;
py = sy;
for (var i = 0; i < 5; i++) {
trail.push({x: px, y: py + 5 - i});
}
vx = 0;
vy = -1;
ax = Math.floor(Math.random() * gw);
ay = Math.floor(Math.random() * gh);
play();
}
function update() {
px += vx;
py += vy;
if (px < 0 || px >= gw || py < 0 || py >= gh) {
die();
}
for (var i = 0; i < trail.length; i++) {
if (px == trail[i].x && py == trail[i].y) {
die();
}
}
trail.push({x: px, y: py});
while (trail.length > tail) {
trail.shift();
}
if (px == ax && py == ay) {
gotapple();
}
}
function render() {
ctx.fillStyle = "black";
ctx.fillRect(0, 0, canvas.width, canvas.height);
ctx.fillStyle = "red";
ctx.fillRect(ax * ts, ay * ts, ts - 2, ts - 2);
ctx.fillStyle = "lime";
for (var i = 0; i < trail.length; i++) {
ctx.fillRect(trail[i].x * ts, trail[i].y * ts, ts - 2, ts - 2);
}
}
function keypress(e) {
if (timer == -1 && e.keyCode != 32) {
return;
}
switch (e.keyCode) {
case 32:
togglepause();
break;
case 37:
if (vx != 0) {
break;
}
vx = -1;
vy = 0;
break;
case 38:
if (vy != 0) {
break;
}
vx = 0;
vy = -1;
break;
case 39:
if (vx != 0) {
break;
}
vx = 1;
vy = 0;
break;
case 40:
if (vy != 0) {
break;
}
vx = 0;
vy = 1;
break;
}
}
function gotapple() {
tail++;
score++;
scorelabel.innerHTML = "Score: " + score;
ax = Math.floor(Math.random() * gw);
ay = Math.floor(Math.random() * gh);
}
function die() {
score = 0;
scorelabel.innerHTML = "Score: 0";
tail = 5;
trail = []
px = sx;
py = sy;
for (var i = 0; i < 5; i++) {
trail.push({x: px, y: py + 5 - i});
}
vx = 0;
vy = -1;
}
function pause() {
clearInterval(timer);
timer = -1;
pauseButton.innerHTML = "play_circle_outline";
}
function play() {
timer = setInterval(function() {
update();
render();
}, 1000 / fps);
pauseButton.innerHTML = "pause_circle_outline";
}
function togglepause() {
if (timer == -1) {
play();
} else {
pause();
}
}
function resizegame() {
canvas.width = window.innerWidth - 2;
canvas.height = window.innerHeight - 2;
gw = Math.floor(canvas.width / ts);
gh = Math.floor(canvas.height / ts);
canvas.width -= canvas.width - (gw * ts);
canvas.height -= canvas.height - (gh * ts);
if (ax >= gw) {
ax = Math.floor(Math.random() * gw);
}
if (ay >= gh) {
ay = Math.floor(Math.random() * gh);
}
}
</script>
</head>
<body>
<div id="container">
<div id="score-label">Score: 0</div>
<button id="pause-button" class="material-icons">pause_circle_outline</button>
<canvas id="canvas" height="400" width="400">
</canvas>
</div>
</body>
</html>