Spróbuj sam - HTML Games movement

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
<style>
canvas {
   border:1px solid #d3d3d3;
   background-color: #f1f1f1;
}
</style>
</head>
<body onload="startGame()">
<script>

var myGamePiece;

function startGame() {
   myGamePiece = new component(30, 30, "red", 225, 225);
   myGameArea.start();
}

var myGameArea = {
   canvas : document.createElement("canvas"),
   start : function() {
   this.canvas.width = 480;
   this.canvas.height = 270;
   this.context = this.canvas.getContext("2d");
   document.body.insertBefore(this.canvas, document.body.childNodes[0]);
   this.frameNo = 0;
   this.interval = setInterval(updateGameArea, 20);
   },
   stop : function() {
   clearInterval(this.interval);
   },
   clear : function() {
   this.context.clearRect(0, 0, this.canvas.width, this.canvas.height);
   }
}

function component(width, height, color, x, y, type) {

   this.type = type;
   this.width = width;
   this.height = height;
   this.speed = 1;
   this.angle = 0;
   this.x = x;
   this.y = y;
   this.update = function() {
   ctx = myGameArea.context;
   ctx.save();
   ctx.translate(this.x, this.y);
   ctx.rotate(this.angle);
   ctx.fillStyle = color;
   ctx.fillRect(this.width / -2, this.height / -2, this.width, this.height);
   ctx.restore();
   }
   this.newPos = function() {
   this.x += this.speed * Math.sin(this.angle);
   this.y -= this.speed * Math.cos(this.angle);
   }
}

function updateGameArea() {
   myGameArea.clear();
   myGamePiece.newPos();
   myGamePiece.update();
}

</script>

<p>The red square will move forward.</p>
<p>Try changing the speed property, and you will see the red square will move accordingly.</p>
</body>
</html>

var myGamePiece;

function startGame() {
    myGamePiece = new component(30, 30, "red", 225, 225);
    myGameArea.start();
}

function component(width, height, color, x, y, type) {

this.type = type;
    this.width = width;
    this.height = height;
    this.speed = 1;
    this.angle = 0;
    this.x = x;
    this.y = y;    
    this.update = function() {
        ctx = myGameArea.context;
        ctx.save();
        ctx.translate(this.x, this.y);
        ctx.rotate(this.angle);
        ctx.fillStyle = color;
        ctx.fillRect(this.width / -2, this.height / -2, this.width, this.height);        
        ctx.restore();    
    }
    this.newPos = function() {
        this.x += this.speed * Math.sin(this.angle);
        this.y -= this.speed * Math.cos(this.angle);
    }
}

function updateGameArea() {
    myGameArea.clear();
    myGamePiece.newPos();
    myGamePiece.update();
}

</script>

<p>The red square will move forward.</p>
<p>Try changing the speed property, and you will see the red square will move accordingly.</p>
</body>
</html>