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Snake.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<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 }
]; //Arrays und JSON
let food;
let cellWidth = canvas.width / cols;
let cellHeight = canvas.height / rows;
let direction = "LEFT";
let foodcollected = false;
placefood();
setInterval(gameloop, 100);
document.addEventListener("keydown", keyDown);
draw();
function draw(){
ctx.fillStyle = "red";
ctx.fillRect(0, 0, canvas.width, canvas.height);
ctx.fillStyle = "white";
snake.forEach(part => add(part.x, part.y));
ctx.fillStyle = "lightgreen";
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];
//schlange erweitern
foodcollected = false;
//nach einer erweiterung aufhöhren zu addieren
}
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){
//futter einsammeln
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>