Codice sorgente JavaScript del gioco HTML Canvas Snake

312 iroger7

Apri nell'Editor Video Pubblica il Tuo Codice

Codice sorgente JavaScript del gioco HTML Canvas Snake

Consigliato

13 November 2025

Gioco di calcio retrò: HTML5 Canvas, segui la telecamera

8 November 2025

Esempio di codice semplice per calcolatrice HTML

28 May 2025

Un codice di Metehan

HTML

<!DOCTYPE html>
<html>
<head>
  <title>Basic Snake HTML Game</title>
  <meta charset="UTF-8">
  <style>
  html, body {
    height: 100%;
    margin: 0;
  }

body {
    background: black;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  canvas {
    border: 1px solid white;
  }
  </style>
</head>
<body>
<canvas width="400" height="400" id="game"></canvas>
<script>
var canvas = document.getElementById('game');
var context = canvas.getContext('2d');

// the canvas width & height, snake x & y, and the apple x & y, all need to be a multiples of the grid size in order for collision detection to work
// (e.g. 16 * 25 = 400)
var grid = 16;
var count = 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 apple = {
  x: 320,
  y: 320
};

// get random whole numbers in a specific range
// @see https://stackoverflow.com/a/1527820/2124254
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 apple
  context.fillStyle = 'red';
  context.fillRect(apple.x, apple.y, grid-1, grid-1);

// draw snake one cell at a time
  context.fillStyle = 'green';
  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 apple
    if (cell.x === apple.x && cell.y === apple.y) {
      snake.maxCells++;

// canvas is 400x400 which is 25x25 grids
      apple.x = getRandomInt(0, 25) * grid;
      apple.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) {
        snake.x = 160;
        snake.y = 160;
        snake.cells = [];
        snake.maxCells = 4;
        snake.dx = grid;
        snake.dy = 0;

apple.x = getRandomInt(0, 25) * grid;
        apple.y = getRandomInt(0, 25) * grid;
      }
    }
  });
}

// 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>

Codice sorgente JavaScript del gioco HTML Canvas Snake

Consigliato

Gioco di calcio retrò: HTML5 Canvas, segui la telecamera

Esempio di codice semplice per calcolatrice HTML

Un codice di Metehan

HTML

CSS

JS

Consigliato

Gioco di calcio retrò: HTML5 Canvas, segui la telecamera

Esempio di codice semplice per calcolatrice HTML

Un codice di Metehan

HTMLCopy

CSSCopy

JSCopy

HTML

CSS

JS