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html游戏中放多个组件并各自运动

51自学网 http://www.wanshiok.com

 

放多个组件

var redGamePiece, blueGamePiece, yellowGamePiece;

function startGame() {
    redGamePiece = new component(7575"red"1010);
    yellowGamePiece = new component(7575"yellow"5060); 
    blueGamePiece = new component(7575"blue"10110);
    
myGameArea.start();
}

function updateGameArea() {
    myGameArea.clear();
    redGamePiece.update();
    yellowGamePiece.update(); 
    blueGamePiece.update();
}

 
。。。

移动组件

三个组件在不同方向运动:

 

function updateGameArea() {
    myGameArea.clear();
    redGamePiece.x += 1;
    yellowGamePiece.x += 1
    yellowGamePiece.y += 1
    blueGamePiece.x += 1
    blueGamePiece.y -= 1
    redGamePiece.update();
    yellowGamePiece.update(); 
    blueGamePiece.update();
}
通过在每次更新中更改每个组件的x坐标和y坐标来移动三个组件。
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 redGamePiece, blueGamePiece, yellowGamePiece;
 
function startGame() {
    redGamePiece = new component(75, 75, "red", 10, 10);
    yellowGamePiece = new component(75, 75, "yellow", 50, 60);    
    blueGamePiece = new component(75, 75, "blue", 10, 220);
    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();
    redGamePiece.x += 1;
    yellowGamePiece.x += 1;    
    yellowGamePiece.y += 1;        
    blueGamePiece.x += 1;        
    blueGamePiece.y -= 1;            
    redGamePiece.update();
    yellowGamePiece.update();        
    blueGamePiece.update();
}
</script>
<p>通过在每次更新中更改x坐标和y坐标来移动三个组件。</p>
</body>
</html>

 
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