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<!DOCTYPE html>
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<html lang="zh">
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<head>
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<meta charset="utf-8" />
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<base href="../../../" />
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<script src="page.js"></script>
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<link type="text/css" rel="stylesheet" href="page.css" />
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</head>
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<body>
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[page:Loader] →
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<h1>[name]</h1>
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<p class="desc">
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用来加载一个[page:Image]的加载器。
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内部使用[page:FileLoader]来加载文件，并被
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[page:CubeTextureLoader]、[page:ObjectLoader]、[page:TextureLoader]所使用。
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</p>
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<h2>代码示例</h2>
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<code>
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// 初始化一个加载器
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const loader = new THREE.ImageLoader();
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// 加载一个图片资源
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loader.load(
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// 资源URL
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'image.png',
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// onLoad回调
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function ( image ) {
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// use the image, e.g. draw part of it on a canvas
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const canvas = document.createElement( 'canvas' );
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const context = canvas.getContext( '2d' );
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context.drawImage( image, 100, 100 );
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},
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// 目前暂不支持onProgress的回调
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undefined,
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// onError回调
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function () {
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console.error( 'An error happened.' );
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}
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);
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</code>
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<p>
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请注意three.js r84遗弃了ImageLoader进度事件. 对于支持进度事件的ImageLoader
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请参考[link:https://github.com/mrdoob/three.js/issues/10439#issuecomment-275785639 this thread].
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</p>
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<h2>例子</h2>
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<p>
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[example:webgl_loader_obj WebGL / loader / obj]<br />
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[example:webgl_shaders_ocean WebGL / shaders / ocean]
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</p>
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<h2>构造方法</h2>
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<h3>[name]( [param:LoadingManager manager] )</h3>
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<p>
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[page:LoadingManager manager] — 加载器使用的[page:LoadingManager loadingManager]，默认为[page:LoadingManager THREE.DefaultLoadingManager].<br /><br />
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创建一个新的[name].
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</p>
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<h2>属性</h2>
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<p>共有属性请参见其基类[page:Loader]。</p>
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<h2>方法</h2>
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<p>共有方法请参见其基类[page:Loader]。</p>
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<h3>[method:HTMLImageElement load]( [param:String url], [param:Function onLoad], [param:Function onProgress], [param:Function onError] )</h3>
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<p>
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[page:String url] — 文件的URL或者路径，也可以为
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[link:https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/Data_URIs Data URI].<br />
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[page:Function onLoad] —加载完成时将调用。回调参数为将要加载的[page:Image image]。<br />
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[page:Function onProgress] — 此回调函数暂时不支持。<br />
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[page:Function onError] — 在加载错误时被调用。<br />
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</p>
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<p>
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从URL中进行加载，并返回将包含数据的[page:Image image]对象。
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</p>
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<h2>源</h2>
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<p>
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[link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]
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</p>
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</body>
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</html>
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