javascript_playground/draw/index.html at master · mohamedale/javascript_playground · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        canvas {
            border :1px solid black;
        }
        body {
            margin: 0
        }
    </style>
</head>
<body>
    <canvas id ='cBattlefield'></canvas>

    <script>
    const battlefield = document.querySelector("canvas")
    battlefield.width = window.innerWidth
    battlefield.height = window.innerHeight

    const context = battlefield.getContext("2d")


    class Alien {
        constructor(x, y) {
            this.x = x;
            this.y = y;
        }

        moveLeft() {
            this.x ++
        }
        moveRight() {
            this.x --
        }
        draw(){
            context.fillRect(this.x,this.y, 100,100)
        }

    }

    let x = 200
    const alien = new Alien(200, 200)
    draw()

    function draw(){
        context.clearRect(0,0,window.innerWidth,window.innerHeight)
        alien.moveLeft()
        alien.draw()
        requestAnimationFrame(draw)
    }
    </script>
</body>
</html>