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javascript – 如何使用thing.js的最小例子？

2019-07-25 02:36:39 作者：互联网

我正在尝试使用matter.js physics library.我正在使用他们的“getting started” tutorial,但它找不到画布.

这是我的HTML：

<html>
<head>
<meta charset="UTF-8">
<title>Physics test</title>
</head>
<script type="text/javascript" src="./lib/matter-0.8.0.js"></script>
<script type="text/javascript">
// Matter.js module aliases
var Engine = Matter.Engine,
    World = Matter.World,
    Bodies = Matter.Bodies;

// create a Matter.js engine
var engine = Engine.create(document.body);

// create two boxes and a ground
var boxA = Bodies.rectangle(400, 200, 80, 80);
var boxB = Bodies.rectangle(450, 50, 80, 80);
var ground = Bodies.rectangle(400, 610, 810, 60, { isStatic: true });

// add all of the bodies to the world
World.add(engine.world, [boxA, boxB, ground]);

// run the engine
Engine.run(engine);
</script>
<body>
</body>
</html>

控制台显示以下错误：

" [Matter] warn: No "render.element" passed, "render.canvas" was not inserted into document."

我试图创建render.element和render.canvas,但我是盲目的.一个“让你开始的最小例子”应该已经有效了.我究竟做错了什么？

解决方法:

从部分演示中脱颖而出,我发现大多数代码应该在一个函数中,在页面加载中调用,如：

<body onl oad='Start()'>

和

function Start() {
    // create a Matter.js engine
    var engine = Engine.create(document.getElementById('canvas-container'));

    // create two boxes and a ground
    var boxA = Bodies.rectangle(400, 200, 80, 80);
    var boxB = Bodies.rectangle(450, 50, 80, 80);
    var ground = Bodies.rectangle(400, 610, 810, 60, { isStatic: true });

    // add all of the bodies to the world
    World.add(engine.world, [boxA, boxB, ground]);

    // run the engine
    Engine.run(engine);
}

标签：javascript,html5,canvas,physics-engine
来源： https://codeday.me/bug/20190725/1528838.html