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No:44632

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Snake Game
Developer User19442｜Date and time 24/2/18 21:36:58
Build time 11.029 sec｜Game capacity 4.399KB｜

Script

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[PR]現在の欲しいゲームランキング

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

```html
<!DOCTYPE html>
<html>
<head>
    <style>
        body {
            margin: 0;
            overflow: hidden;
        }
        canvas {
            background-color: black;
            display: block;
            margin: auto;
        }
    </style>
</head>
<body>
    <canvas id="gameCanvas"></canvas>

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

snake.checkCollision();
            }, 100);
            
            window.addEventListener('keydown', ((e) => {
                const direction = e.key.replace('Arrow', '');
                snake.changeDirection(direction);
            }));
        }());

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

this.draw = function() {
                ctx.fillStyle = 'white';

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);
            }

this.update = function() {
                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;
                }
            }

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

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

return false;
            }

this.checkCollision = function() {
                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 = [];
                    }
                }
            }
        }

function Fruit() {
            this.x;
            this.y;

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

this.draw = function() {
                ctx.fillStyle = 'red';
                ctx.fillRect(this.x, this.y, scale, scale);
            }
        }
    </script>
</body>
</html>
```