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Snake #120

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6 changes: 6 additions & 0 deletions snake.css
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Original file line number Diff line number Diff line change
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canvas {
display: block;
margin-left: auto;
margin-right: auto;
border: 1px solid black;
}
13 changes: 13 additions & 0 deletions snake.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Snake</title>
<link rel="stylesheet" href="snake.css">
<script src="snake.js"></script>
</head>
<body>
<canvas width="600" height="550">
</canvas>
</body>
</html>
133 changes: 133 additions & 0 deletions snake.js
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(function() {

var score = 0;
var xchange = 0;
var ychange = 0;
var canvas;
var context;
var width;
var height;
var interval_id;
var moveUp = false;
var moveDown = false;
var moveLeft = false;
var moveRight = false;
var snake = {
x : 50,
y : 150,
size : 10
};
var food;

document.addEventListener('DOMContentLoaded', init, false);

function init() {
canvas = document.querySelector('canvas');
context = canvas.getContext('2d');
width = canvas.width;
height = canvas.height;
window.addEventListener('keydown', pressed, false);
window.addEventListener('keyup', unpressed, false);
interval_id = window.setInterval(draw, 33);
food = {
x : getRandomNumber(0, canvas.width),
y : getRandomNumber(0, canvas.height),
size : 10,
color : 'limegreen'
};
}

function draw() {
context.clearRect(0, 0, width, height)
context.fillStyle = 'black';
context.fillRect(snake.x, snake.y, snake.size, snake.size);
if(snake.y < 0 || snake.y + snake.size >= height ||
snake.x + snake.size >= width || snake.x < 0) {
stop();
window.alert('you lose' + ' your score is: ' + score)
return
}
if (collides(food)) {
score += 1;
food.x = getRandomNumber(0, canvas.width)
food.y = getRandomNumber(0, canvas.height)
}
else {
context.fillStyle = food.color;
context.fillRect(food.x, food.y, food.size, food.size);
}
if (moveUp) {
ychange = -3;
xchange = 0;
}
if (moveDown) {
ychange = 3;
xchange = 0;
}
if(moveLeft) {
ychange = 0;
xchange = -3;
}
if(moveRight) {
ychange = 0;
xchange = 3;
}
snake.x += xchange
snake.y += ychange
}

function collides(food) {
if (snake.x + snake.size < food.x ||
food.x + food.size < snake.x ||
snake.y > food.y + food.size ||
food.y > snake.y + snake.size) {
return false;
}
else {
return true;
}
}

function stop() {
clearInterval(interval_id);
window.removeEventListener('keyDown', pressed);
window.removeEventListener('keyUp', unpressed);
}

function pressed(event) {
var keyCode = event.keyCode;
if (keyCode === 38) {
moveUp = true;
}
else if (keyCode === 40) {
moveDown = true;
}
else if (keyCode === 37) {
moveLeft = true;
}
else if (keyCode === 39) {
moveRight = true;
}
}

function unpressed(event) {
var keyCode = event.keyCode;
if (keyCode === 38) {
moveUp = false;
}
else if (keyCode === 40) {
moveDown = false;
}
else if (keyCode === 37) {
moveLeft = false;
}
else if (keyCode === 39) {
moveRight = false;
}
}

function getRandomNumber(min, max) {
return Math.round(Math.random() * (max - min)) + min;
}

})();