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game.io
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game.io
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<!DOCTYPE html>
<html>
<head>
<title></title>
<style>
html,
body {
height: 100%;
margin: 0;
}
body {
background: #0C1821;
display: flex;
align-items: center;
justify-content: center;
}
canvas {
border: 1px solid white;
background-color: #324A5F;
}
#p1 {
color: #CCC9DC;
position: absolute;
/* left: 100px; */
top: 10px;
font-family: cursive;
font-size: x-large;
}
#p2 {
color: #CCC9DC;
position: absolute;
/* left: 100px; */
top: 30px;
font-family: cursive;
font-size: x-large;
margin-top: 35px;
}
#score {
color: yellow;
}
#high {
color: #E43F5A;
}
</style>
</head>
<body>
<p id="p1">Score:<span id="score"></span></p>
<p id="p2">High Score:<span id="high"></span></p>
<canvas width="400" height="400" id="game"></canvas>
<script>
var canvas = document.getElementById('game');
var context = canvas.getContext('2d');
var grid = 16;
var count = 0;
var score = 0;
var max = 0;
var snake = {
x: 160,
y: 160,
// snake velocity. moves one grid length every frame in either the x or y direction
dx: grid,
dy: 0,
// keep track of all grids the snake body occupies
cells: [],
// length of the snake. grows when eating an apple
maxCells: 4
};
var food = {
x: 320,
y: 320
};
// get random whole numbers in a specific range
function getRandomInt(min, max) {
return Math.floor(Math.random() * (max - min)) + min;
}
// game loop
function loop() {
requestAnimationFrame(loop);
// slow game loop to 15 fps instead of 60 (60/15 = 4)
if (++count < 4) {
return;
}
count = 0;
context.clearRect(0, 0, canvas.width, canvas.height);
// move snake by it's velocity
snake.x += snake.dx;
snake.y += snake.dy;
// wrap snake position horizontally on edge of screen
if (snake.x < 0) {
snake.x = canvas.width - grid;
}
else if (snake.x >= canvas.width) {
snake.x = 0;
}
// wrap snake position vertically on edge of screen
if (snake.y < 0) {
snake.y = canvas.height - grid;
}
else if (snake.y >= canvas.height) {
snake.y = 0;
}
// keep track of where snake has been. front of the array is always the head
snake.cells.unshift({ x: snake.x, y: snake.y });
// remove cells as we move away from them
if (snake.cells.length > snake.maxCells) {
snake.cells.pop();
}
// draw food
context.fillStyle = 'white';
context.fillRect(food.x, food.y, grid - 1, grid - 1);
// draw snake one cell at a time
context.fillStyle = '#E43F5A';
snake.cells.forEach(function (cell, index) {
// drawing 1 px smaller than the grid creates a grid effect in the snake body so you can see how long it is
context.fillRect(cell.x, cell.y, grid - 1, grid - 1);
// snake ate food
if (cell.x === food.x && cell.y === food.y) {
snake.maxCells++;
score += 1;
document.getElementById('score').innerHTML = ' ' + score;
// canvas is 400x400 which is 25x25 grids
food.x = getRandomInt(0, 25) * grid;
food.y = getRandomInt(0, 25) * grid;
}
// check collision with all cells after this one (modified bubble sort)
for (var i = index + 1; i < snake.cells.length; i++) {
// snake occupies same space as a body part. reset game
if (cell.x === snake.cells[i].x && cell.y === snake.cells[i].y) {
if (score > max) {
max = score;
}
snake.x = 160;
snake.y = 160;
snake.cells = [];
snake.maxCells = 4;
snake.dx = grid;
snake.dy = 0;
score = 0;
food.x = getRandomInt(0, 25) * grid;
food.y = getRandomInt(0, 25) * grid;
document.getElementById('high').innerHTML = ' ' + max;
}
}
});
}
// listen to keyboard events to move the snake
document.addEventListener('keydown', function (e) {
// prevent snake from backtracking on itself by checking that it's
// not already moving on the same axis (pressing left while moving
// left won't do anything, and pressing right while moving left
// shouldn't let you collide with your own body)
// left arrow key
if (e.which === 37 && snake.dx === 0) {
snake.dx = -grid;
snake.dy = 0;
}
// up arrow key
else if (e.which === 38 && snake.dy === 0) {
snake.dy = -grid;
snake.dx = 0;
}
// right arrow key
else if (e.which === 39 && snake.dx === 0) {
snake.dx = grid;
snake.dy = 0;
}
// down arrow key
else if (e.which === 40 && snake.dy === 0) {
snake.dy = grid;
snake.dx = 0;
}
});
// start the game
requestAnimationFrame(loop);
</script>
</body>
</html>