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Snake Game using HTML, CSS and JavaScript #36

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166 changes: 166 additions & 0 deletions Snake.html
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Original file line number Diff line number Diff line change
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<!DOCTYPE html>
<html>
<head>
<title>Snake Game</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
<style>
canvas
{
border: 3px solid #111;
background-color: #f1f1f1;
}
</style>
</head>
<body onload="startGame()" align="center">
<!-- this will show score of the game. -->
<p id="demo"><b></b></p>
<script>
var fruit;
var snake;
var tail = new Array(100);
var nTail, tempX, tempY, prevX, prevY, score;
//start the game;
function startGame()
{
//randomly generate a position for both fruit and snake;
var fruit_x = Math.floor((Math.random() * 470) + 10);
var fruit_y = Math.floor((Math.random()*260) + 10);
var snake_x = Math.floor((Math.random() * 470) + 10);
var snake_y = Math.floor((Math.random()*260) + 10);
nTail = 0;
score = 0;

myGameArea.start();
//create block for both fruit and snake;
fruit = new component(10, 10, "red", fruit_x, fruit_y, "fruit");
snake = new component(10, 10, "black", snake_x, snake_y, "snake");
}

var myGameArea = {
canvas : document.createElement("canvas"),
start : function()
{
this.canvas.width = 480;
this.canvas.height = 270;
this.context = this.canvas.getContext("2d");
document.body.insertBefore(this.canvas, document.body.childNodes[0]);
this.interval = setInterval(updateGameArea, 20);
window.addEventListener('keydown', function (e){myGameArea.key = e.keyCode;})
window.addEventListener('keyup', function (e){myGameArea.key = false;})
},
//clear the screen;
clear : function()
{
this.context.clearRect(0, 0, this.canvas.width, this.canvas.height);
}
}
//this function will return score of the game;
function component(width, height, color, x, y, type)
{
this.width = width;
this.height = height;
this.speedX = 0;
this.speedY = 0;
this.x = x;
this.y = y;
//update position of the fruit;
this.update_fruit = function()
{
ctx = myGameArea.context;
ctx.fillStyle = color;
ctx.fillRect(this.x, this.y, this.width, this.height);
}
//update position of the snake;
this.update_snake = function()
{
prevX = this.x;
prevY = this.y;
if(Math.abs(snake.x - fruit.x) < 3 && Math.abs(snake.y - fruit.y) < 3)
{
score += 10;
nTail++;
fruit.x = Math.floor((Math.random() * 470) + 10);
fruit.y = Math.floor((Math.random() * 260) + 10);
}
for(i = 0; i < nTail - 1; i++)
{
tempX = tail[i].x;
tempY = tail[i].y;
tail[i].x = prevX;
tail[i].y = prevY;
prevX = tempX;
prevY = tempY;
}
if(nTail > 0)
{
tail[nTail - 1] = new component(10, 10, "green", prevX, prevY);
}
document.getElementById("demo").innerHTML = "SCORE:: " + score;
this.x += this.speedX;
this.y += this.speedY;
if(snake.x > 480)
{
snake.x = 0;
}
else if(snake.x < 0)
{
snake.x = 480;
}
if(snake.y > 270)
{
snake.y = 0;
}
else if(snake.y < 0)
{
snake.y = 270;
}
ctx = myGameArea.context;
ctx.fillStyle = color;
ctx.fillRect(this.x, this.y, this.width, this.height);
for(i = 0; i < nTail; i += 1)
{
ctx = myGameArea.context;
ctx.fillStyle = color;
ctx.fillRect(tail[i].x, tail[i].y, this.width, this.height);
}
}
}
function updateGameArea()
{
myGameArea.clear();
//left arrow for left movement;
if(myGameArea.key && myGameArea.key == 37)
{
snake.speedX = -2;
snake.speedY = 0;
}
//right arrow for right movement;
if(myGameArea.key && myGameArea.key == 39)
{
snake.speedX = 2;
snake.speedY = 0;
}
//upper arrow for upper movement;
if(myGameArea.key && myGameArea.key == 38)
{
snake.speedY = -2;
snake.speedX = 0;
}
//lower arrow for lower movement;
if(myGameArea.key && myGameArea.key == 40)
{
snake.speedY = 2;
snake.speedX = 0;
}
//space for pause;
if(myGameArea.key && myGameArea.key == 32)
{
snake.speedX = 0;
snake.speedY = 0;
}
fruit.update_fruit();
snake.update_snake();
}
</script>
</body>
</html>