95 lines
2.3 KiB
JavaScript
95 lines
2.3 KiB
JavaScript
"use strict";
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const cvs = document.getElementById("snake");
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const ctx = cvs.getContext("2d");
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const box = 20;
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let snake = [{ x: 9 * box, y: 10 * box }];
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let food = {
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x: Math.floor(Math.random() * 19 + 1) * box,
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y: Math.floor(Math.random() * 19 + 1) * box,
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};
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let score = 0;
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let d;
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let game;
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document.addEventListener("keydown", direction);
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function direction(event) {
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let key = event.keyCode;
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if ((key == 37 || key == 65) && d != "RIGHT") d = "LEFT";
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else if ((key == 38 || key == 87) && d != "DOWN") d = "UP";
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else if ((key == 39 || key == 68) && d != "LEFT") d = "RIGHT";
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else if ((key == 40 || key == 83) && d != "UP") d = "DOWN";
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}
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function collision(head, array) {
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return array.some((part) => head.x == part.x && head.y == part.y);
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}
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function draw() {
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ctx.fillStyle = "#0f380f";
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ctx.fillRect(0, 0, cvs.width, cvs.height);
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ctx.fillStyle = "red";
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ctx.fillRect(food.x, food.y, box, box);
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for (let i = 0; i < snake.length; i++) {
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ctx.fillStyle = i == 0 ? "lime" : "white";
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ctx.fillRect(snake[i].x, snake[i].y, box, box);
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ctx.strokeStyle = "black";
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ctx.strokeRect(snake[i].x, snake[i].y, box, box);
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}
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let snakeX = snake[0].x;
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let snakeY = snake[0].y;
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if (d == "LEFT") snakeX -= box;
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if (d == "UP") snakeY -= box;
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if (d == "RIGHT") snakeX += box;
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if (d == "DOWN") snakeY += box;
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if (snakeX == food.x && snakeY == food.y) {
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score++;
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food = {
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x: Math.floor(Math.random() * 19 + 1) * box,
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y: Math.floor(Math.random() * 19 + 1) * box,
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};
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} else {
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snake.pop();
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}
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let newHead = { x: snakeX, y: snakeY };
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if (
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snakeX < 0 ||
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snakeX >= cvs.width ||
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snakeY < 0 ||
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snakeY >= cvs.height ||
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collision(newHead, snake)
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) {
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clearInterval(game);
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document.getElementById("restartBtn").style.display = "block";
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return;
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}
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snake.unshift(newHead);
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ctx.fillStyle = "white";
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ctx.font = "20px Arial";
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ctx.fillText("Score: " + score, 10, 20);
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}
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function restartGame() {
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snake = [{ x: 9 * box, y: 10 * box }];
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food = {
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x: Math.floor(Math.random() * 19 + 1) * box,
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y: Math.floor(Math.random() * 19 + 1) * box,
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};
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score = 0;
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d = "";
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document.getElementById("restartBtn").style.display = "none";
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game = setInterval(draw, 150);
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}
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document.getElementById("restartBtn").addEventListener("click", restartGame);
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game = setInterval(draw, 150);
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