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html教程之游戏组件--帧-重画

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 接着前一讲,让红色方块水平移动移动。

为了证明红色方块每秒绘制50次,我们将在每次更新游戏区域时将x位置(水平)改变一个像素:
 
function updateGameArea(){
    myGameArea.clear();
     myGamePiece.x + = 1;
    myGamePiece.update();
}
 
 
完整代码
<!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.x = x;
    this.y = y;    
    this.update = function(){
        ctx = myGameArea.context;
        ctx.fillStyle = color;
        ctx.fillRect(this.x, this.y, this.width, this.height);
    }
}
 
function updateGameArea() {
    myGameArea.clear();
    myGamePiece.x += 1;
    myGamePiece.update();
}
</script>
<p>红色方块向右移动一个像素,每秒移动50次。</p>
</body>
</html>

 
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