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Fix
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<!DOCTYPE html> | |
<html lang="en"> | |
<head> | |
<meta charset="UTF-8"> | |
<meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
<title>Snake</title> | |
</head> | |
<body> | |
<canvas id="canvas" width="480" height="480"></canvas> | |
<script> | |
let canvas = document.getElementById('canvas'); | |
let ctx = canvas.getContext('2d'); | |
let rows = 20; | |
let cols = 20; | |
let snake = [{x: 19, y:3}]; | |
let food = {x: 4, y: 5}; | |
let cellWidth = canvas.width / cols; | |
let cellHeight = canvas.height / rows; | |
let direction = 'LEFT'; | |
let foodCollected = false; | |
placeFood(); | |
setInterval(gameLoop, 500); | |
document.addEventListener('keydown', keyDown); | |
draw(); | |
function draw() { | |
ctx.fillStyle = 'black'; | |
ctx.fillRect(0, 0, canvas.width, canvas.height); | |
ctx.fillStyle = 'white'; | |
snake.forEach(part => add(part.x, part.y)); | |
ctx.fillStyle = 'yellow'; | |
add(food.x, food.y); //food | |
requestAnimationFrame(draw); | |
} | |
function placeFood(){ | |
let randomX = Math.floor(Math.random() * cols); | |
let randomY = Math.floor(Math.random() * rows); | |
food = {x: randomX, y: randomY}; | |
} | |
function add(x, y) { | |
ctx.fillRect(x * cellWidth, y * cellHeight, cellWidth - 1, cellHeight - 1); | |
} | |
function shiftsnake() { | |
for (let i = snake.length - 1; i > 0; i--) { | |
const part = snake[i]; | |
const lastPart = snake[i - 1]; | |
part.x = lastPart.x; | |
part.y = lastPart.y; | |
} | |
} | |
function gameLoop() { | |
// if(foodCollected) { | |
// snake = [{x: snake[0].x, y: snake[0].y}, ...snake]; | |
// foodCollected = false; | |
// } | |
if(foodCollected) { | |
snake.push({x: snake[snake.length - 1].x, y: snake[snake.length - 1].y}); | |
foodCollected = false; | |
} | |
shiftsnake(); | |
if (direction == 'LEFT') { | |
snake[0].x--; | |
} | |
if (direction == 'RIGHT') { | |
snake[0].x++; | |
} | |
if (direction == 'UP') { | |
snake[0].y--; | |
} | |
if (direction == 'DOWN') { | |
snake[0].y++; | |
} | |
if(snake[0].x == food.x && snake[0].y == food.y) { | |
foodCollected = true; | |
placeFood(); | |
} | |
} | |
function keyDown(e) { | |
if (e.keyCode == 37) { | |
direction = 'LEFT'; | |
} | |
if (e.keyCode == 38) { | |
direction = 'UP'; | |
} | |
if (e.keyCode == 39) { | |
direction = 'RIGHT'; | |
} | |
if (e.keyCode == 40) { | |
direction = 'DOWN'; | |
} | |
} | |
</script> | |
</body> | |
</html> |
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if(foodCollected) { | |
snake.push({x: snake[snake.length - 1].x, y: snake[snake.length - 1].y}); | |
foodCollected = false; | |
} |
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