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html5游戏中如何设置键盘的方向键控制组件的运动

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 使用键盘

使用键盘时红色方块如何移动? 而不是上下移动,或者从一侧到另一侧,当您使用“向上”箭头时,红色方块向前移动,当按向左和向右箭头时,它会向左和向右移动。
<!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);
        window.addEventListener('keydown', function (e) {
            e.preventDefault();
            myGameArea.keys = (myGameArea.keys || []);
            myGameArea.keys[e.keyCode] = (e.type == "keydown");
        })
        window.addEventListener('keyup', function (e) {
            myGameArea.keys[e.keyCode] = (e.type == "keydown");            
        })
    },
    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 = 0;
    this.angle = 0;
    this.moveAngle = 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.angle += this.moveAngle * Math.PI / 180;
        this.x += this.speed * Math.sin(this.angle);
        this.y -= this.speed * Math.cos(this.angle);
    }
}
 
function updateGameArea() {
    myGameArea.clear();
    myGamePiece.moveAngle = 0;
    myGamePiece.speed = 0;
    if (myGameArea.keys && myGameArea.keys[37]) {myGamePiece.moveAngle = -1; }
    if (myGameArea.keys && myGameArea.keys[39]) {myGamePiece.moveAngle = 1; }
    if (myGameArea.keys && myGameArea.keys[38]) {myGamePiece.speed= 1; }
    if (myGameArea.keys && myGameArea.keys[40]) {myGamePiece.speed= -1; }
    myGamePiece.newPos();
    myGamePiece.update();
}
 
</script>
 
<p>确保游戏区具有焦点,并使用箭头键移动红色方块。同时按两个方向键看看效果.</p>
</body>
</html>

 
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