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Snake Game
Developer User18896｜Date and time 24/3/2 19:28:09
Build time 12.07 sec｜Game capacity 4.684KB｜

Script

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[PR]現在の本の売れ筋ランキング

Click here for free DL of the app version that can save data.

<!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 Game</title>
    <style>
        canvas {
            border: 1px solid black;
        }
    </style>
</head>
<body>
    <canvas id="gameCanvas" width="400" height="400"></canvas>

const scale = 20;
        const rows = canvas.height / scale;
        const columns = canvas.width / scale;

let snake;
        let fruit;

function setup() {
            snake = new Snake();
            fruit = new Fruit();
            fruit.pickLocation();

window.setInterval(() => {
                ctx.clearRect(0, 0, canvas.width, canvas.height);
                snake.update();
                snake.draw();
                fruit.draw();

if (snake.eat(fruit)) {
                    fruit.pickLocation();
                }

snake.checkCollision();
                document.querySelector('.info').innerText = `Score: ${snake.total}`;
            }, 100);
            
            window.addEventListener('keydown', ((evt) => {
                const direction = evt.key.replace('Arrow', '');
                snake.changeDirection(direction);
            }));
        }

class Snake {
            constructor() {
                this.x = 0;
                this.y = 0;
                this.xSpeed = scale * 1;
                this.ySpeed = 0;
                this.total = 0;
                this.tail = [];
            }

draw() {
                ctx.fillStyle = "green";
                for (let i = 0; i < this.tail.length; i++) {
                    ctx.fillRect(this.tail[i].x, this.tail[i].y, scale, scale);
                }
                ctx.fillRect(this.x, this.y, scale, scale);
            }

update() {
                for (let i = 0; i < this.tail.length - 1; i++) {
                    this.tail[i] = this.tail[i + 1];
                }
                this.tail[this.total - 1] = { x: this.x, y: this.y };

this.x += this.xSpeed;
                this.y += this.ySpeed;

if (this.x >= canvas.width) this.x = 0;
                if (this.y >= canvas.height) this.y = 0;
                if (this.x < 0) this.x = canvas.width - scale;
                if (this.y < 0) this.y = canvas.height - scale;
            }

changeDirection(direction) {
                switch (direction) {
                    case 'Up':
                        if (this.ySpeed === 0) {
                            this.xSpeed = 0;
                            this.ySpeed = -scale * 1;
                        }
                        break;
                    case 'Down':
                        if (this.ySpeed === 0) {
                            this.xSpeed = 0;
                            this.ySpeed = scale * 1;
                        }
                        break;
                    case 'Left':
                        if (this.xSpeed === 0) {
                            this.xSpeed = -scale * 1;
                            this.ySpeed = 0;
                        }
                        break;
                    case 'Right':
                        if (this.xSpeed === 0) {
                            this.xSpeed = scale * 1;
                            this.ySpeed = 0;
                        }
                        break;
                }
            }

eat(fruit) {
                if (this.x === fruit.x && this.y === fruit.y) {
                    this.total++;
                    return true;
                }
                return false;
            }

checkCollision() {
                for (let i = 0; i < this.tail.length; i++) {
                    if (this.x === this.tail[i].x && this.y === this.tail[i].y) {
                        this.total = 0;
                        this.tail = [];
                    }
                }
            }
        }

class Fruit {
            constructor() {
                this.x;
                this.y;
            }

pickLocation() {
                this.x = (Math.floor(Math.random() * rows - 1) + 1) * scale;
                this.y = (Math.floor(Math.random() * columns - 1) + 1) * scale;
            }

draw() {
                ctx.fillStyle = 'red';
                ctx.fillRect(this.x, this.y, scale, scale);
            }
        }

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