Javascript/DOUBLE_JUMP.html at main · coderATP/Javascript · GitHub

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<!DOCTYPE html>
<html>

<head>
<style>
       *{
       padding: 0;
       margin: 0;
       user-select: none;
       box-sizing: border-box;
    }
    #canvas{
        border: 1px dashed green;
        position: absolute;
        max-width: 100%;
        max-height: 100%;
    }
    body{
        background-color: black;
    }
    #up{
        position: absolute;
        font-size: 3rem;
        bottom: 50%;
        left: 2%;
        color: white;
        background: transparent;
        width: 10%;
    }
    #up:hover{
        color: green;
        background-color: lightgray;
    }

</style>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Double Jump</title>
    <link rel="stylesheet" href="style.css">
</head>

<body>

<canvas id = 'canvas'></canvas>
<button id = 'up'> J</button>

<script src="script.js"></script>
<script>
    window.addEventListener('load', ()=>{
    //nxjskkskjsggsggßhnsmkskskskksjsjshshsjsjsjjsjsjsjsjjsjsjsjshhshshshshhsnsjsjshshshshhsbshshshshshshshshbzbsjsjjshshshshhshshshshvbb
   // const canvas = document.querySelector('#canvas');

    class Game{
        constructor(canvas){
            this.canvas = canvas;
            this.width = this.canvas.width;
            this.height = this.canvas.height;

            //input
            this.keys = [];
            this.keypressed = false;

            const btns = document.querySelectorAll('button');
            btns.forEach(btn => {
                btn.addEventListener('touchstart', (e) => {
                    const key = e.target.id;
                    if (this.keys.indexOf(key) < 0) {
                        this.keys.push(key);
                        this.keypressed = true;
                    }
                })
                btn.addEventListener('touchend', (e) => {
                    const key = e.target.id;
                    if (this.keys.indexOf(key) > -1) {
                        this.keys.splice(this.keys.indexOf(key), 1);
                        this.keypressed = false;
                    }
                })
            })

            this.player = new Player(this);
        }

        render(ctx){
            this.player.draw(ctx);

            this.drawStatusText(ctx);
        }

        update(deltaTime){
            this.player.update(deltaTime);
        }
        drawStatusText(ctx){
            ctx.textAlign = 'center'
            ctx.textBaseline = 'middle'
            ctx.fillStyle = 'gold'
            ctx.font = '20px Helvetica';
            ctx.fillText("JAVASCRIPT CODE TO DOUBLE-JUMP", this.width*0.5, 20);
            ctx.font = '10px Serif'
            ctx.fillStyle = 'white'
            ctx.fillText("Press 'J' to jump. Press twice to double-jump", this.width*0.5, 40);
            ctx.fillStyle = 'green'
            ctx.fillText("Press 'J' to jump. Press twice to double-jump", (this.width*0.5)+1, 41);

        }
    }

    class Player{
        constructor(game){
            this.game = game;
            this.width = 20;
            this.height = 20;
            this.x = 200;
            this.y = 100;
            this.color = 'gold';
            this.speedX = 0
            this.speedY = 0
            this.gravity = 1;
            this.maxJump = 2;
        }
        draw(ctx){
            ctx.fillStyle = this.color;
            ctx.fillRect(this.x, this.y, this.width, this.height);
        }

        update(deltaTime){
            this.x += this.speedX;
            this.applyGravity();
            this.handleInput();

            if (this.onGround() ) {
                this.maxJump = 2;
                this.y = this.game.height - this.height;
            }
        }
        onGround(){
            return(this.y + this.height > this.game.height)
        }
        applyGravity(){
            this.speedY+= this.gravity;
            this.y+= this.speedY;
        }

        handleInput(){
            if(this.game.keys.indexOf('up') > -1 && this.game.keypressed && this.maxJump > 1){
                this.speedY = -20;
                this.maxJump--;
                this.game.keypressed = false;
            }
        }
    }

    canvas.width = innerWidth;
    canvas.height = innerHeight;
    const ctx = canvas.getContext('2d');

    const game = new Game(canvas);
    function loop(timestamp){
        ctx.clearRect(0,0, canvas.width, canvas.height)

        game.render(ctx);

        game.update(0);

        requestAnimationFrame(loop);
    }
    loop(0);
})


</script>
</body>

</html>