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Snake Game
Developer User14077｜Date and time 24/3/17 4:44:36
Build time 8.741 sec｜Game capacity 2.732KB｜

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<!DOCTYPE html>
<html lang="de">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Schlange Spiel</title>
  <style>
    canvas {
      border: 1px solid #333;
    }
  </style>
</head>
<body>
  <canvas id="gameCanvas" width="400" height="400"></canvas>
  <script>
    const canvas = document.getElementById("gameCanvas");
    const ctx = canvas.getContext("2d");

const gridSize = 20;
    const tileCount = 20;
    const snake = [{ x: 10, y: 10 }];
    let fruit = { x: 5, y: 5 };
    let direction = "right";
    let gameover = false;

function draw() {
      if (gameover) {
        ctx.fillStyle = "#f00";
        ctx.font = "30px Arial";
        ctx.fillText("GAME OVER", 100, canvas.height / 2);
        return;
      }

ctx.clearRect(0, 0, canvas.width, canvas.height);

// draw snake
      ctx.fillStyle = "#0f0";
      snake.forEach(segment => {
        ctx.fillRect(segment.x * gridSize, segment.y * gridSize, gridSize - 2, gridSize - 2);
      });

// draw fruit
      ctx.fillStyle = "#f00";
      ctx.fillRect(fruit.x * gridSize, fruit.y * gridSize, gridSize - 2, gridSize - 2);
    }

function update() {
      if (gameover) return;

const head = JSON.parse(JSON.stringify(snake[0]));
      switch (direction) {
        case "up":
          head.y--;
          break;
        case "right":
          head.x++;
          break;
        case "down":
          head.y++;
          break;
        case "left":
          head.x--;
          break;
      }

if (head.x < 0 || head.x >= tileCount || head.y < 0 || head.y >= tileCount) {
        gameover = true;
        return;
      }

if (head.x === fruit.x && head.y === fruit.y) {
        snake.unshift(head);
        do {
          fruit.x = Math.floor(Math.random() * tileCount);
          fruit.y = Math.floor(Math.random() * tileCount);
        } while (snake.some(segment => segment.x === fruit.x && segment.y === fruit.y));
      } else {
        snake.pop();
        if (snake.some(segment => segment.x === head.x && segment.y === head.y)) {
          gameover = true;
          return;
        }
        snake.unshift(head);
      }
    }

function loop() {
      draw();
      update();
      setTimeout(loop, 100);
    }

document.addEventListener("keydown", event => {
      switch (event.key) {
        case "ArrowUp":
          direction = "up";
          break;
        case "ArrowRight":
          direction = "right";
          break;
        case "ArrowDown":
          direction = "down";
          break;
        case "ArrowLeft":
          direction = "left";
          break;
      }
    });

loop();
  </script>
</body>
</html>