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html游戏-游戏控制器--用按钮控制对象的移动和停止

51自学网 http://www.wanshiok.com

 

在上面的例子中,点击按钮后方块就开始移动,但不能停下

我们现在设定释放按钮时,红色方块停止运动。


添加一个将速度指示器设置为0的功能。


为了同时满足普通屏幕和触摸屏,我们添加如下代码:

实例

function stopMove() {
    myGamePiece.speedX = 0;
    myGamePiece.speedY = 0
}
</script>

<button omousedown="moveup()" onmouseup="stopMove()" ontouchstart="moveup()">UP</button>
<button omousedown="movedown()" onmouseup="stopMove()" ontouchstart="movedown()">DOWN</button>
<button omousedown="moveleft()" onmouseup="stopMove()" ontouchstart="moveleft()">LEFT</button>
<button omousedown="moveright()" onmouseup="stopMove()" ontouchstart="moveright()">RIGHT</button>
 
完整源代码:
<!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", 10, 120);
    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.interval = setInterval(updateGameArea, 20);
    },
    clear : function() {
        this.context.clearRect(0, 0, this.canvas.width, this.canvas.height);
    }
}

function component(width, height, color, x, y) {
    this.width = width;
    this.height = height;
    this.speedX = 0;
    this.speedY = 0;
    this.x = x;
    this.y = y;    
    this.update = function() {
        ctx = myGameArea.context;
        ctx.fillStyle = color;
        ctx.fillRect(this.x, this.y, this.width, this.height);
    }
    this.newPos = function() {
        this.x += this.speedX;
        this.y += this.speedY;        
    }    
}

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

function moveup() {
    myGamePiece.speedY = -1; 
}

function movedown() {
    myGamePiece.speedY = 1; 
}

function moveleft() {
    myGamePiece.speedX = -1; 
}

function moveright() {
    myGamePiece.speedX = 1; 
}

function clearmove() {
    myGamePiece.speedX = 0; 
    myGamePiece.speedY = 0; 
}
</script>
<div style="text-align:center;width:480px;">
  <button onmousedown="moveup()" onmouseup="clearmove()" ontouchstart="moveup()">UP</button><br><br>
  <button onmousedown="moveleft()" onmouseup="clearmove()" ontouchstart="moveleft()">LEFT</button>
  <button onmousedown="moveright()" onmouseup="clearmove()" ontouchstart="moveright()">RIGHT</button><br><br>
  <button onmousedown="movedown()" onmouseup="clearmove()" ontouchstart="movedown()">DOWN</button>
</div>

<p>如果您按下一个按钮,红色方块将开始移动。 当您释放该按钮,移动将停止。</ p><p>我们已经在按钮上添加了ontouchstart事件,以使此示例适用于触摸屏设备。</ p>
</body>
</html>

 
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