Canvas/08. SoftUni_Keyboard Diagonal Movement.html at master · WalidOfNow/Canvas · GitHub

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<!DOCTYPE html>
<html>
<head>
    <title>Diagonal movement exercise</title>
</head>
<body>
<canvas id="canvas" width="800" height="500" style="border: 2px solid blue">
Canvas not supported
</canvas>
<script type="text/javascript">
    let canvas = document.getElementById("canvas");
    let ctx = canvas.getContext("2d");
    let rectObj = {x: 100, y: 100};
    let keysObj = {};

    window.addEventListener("keydown", keysHandler);
    window.addEventListener("keyup", keysHandler);

    rectRendering();

    function rectRendering() {
        ctx.beginPath();
        ctx.clearRect(0,0,800,500);
        ctx.fillRect(rectObj.x,rectObj.y,100,100);
        ctx.closePath();
    }

    function update() {
        if (keysObj["ArrowRight"]) {
            rectObj.x += 5;
        }
        if (keysObj["ArrowLeft"]) {
            rectObj.x -= 5;
        }
        if (keysObj["ArrowDown"]) {
            rectObj.y += 5;
        }
        if (keysObj["ArrowUp"]) {
            rectObj.y -= 5;
        }
        rectRendering();
    }

    function keysHandler(event) {
        if (event.type == "keydown") {
            keysObj[event.code] = true;
        }  if (event.type == "keyup") {
            delete keysObj[event.code];
        }
        update();
    }
</script>
</body>
</html>