604 lines
54 KiB
HTML
604 lines
54 KiB
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<title>DiscardMissingTileImagePolicy - Cesium Documentation</title>
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<!--[if lt IE 9]>
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<script src="javascript/html5.js"></script>
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<![endif]-->
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<link href="styles/jsdoc-default.css" rel="stylesheet">
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<link href="styles/prism.css" rel="stylesheet">
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</head>
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<body>
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<div id="main">
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<h1 class="page-title">
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<a href="index.html"><img src="Images/CesiumLogo.png" class="cesiumLogo"></a>
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DiscardMissingTileImagePolicy
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<div class="titleCenterer"></div>
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</h1>
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<section>
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<header>
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</header>
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<article>
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<div class="container-overview">
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<div class="nameContainer">
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<h4 class="name" id="DiscardMissingTileImagePolicy">
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<a href="#DiscardMissingTileImagePolicy" class="doc-link"></a>
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new Cesium.DiscardMissingTileImagePolicy<span class="signature">(options)</span>
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<div class="source-link rightLinks">
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<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Scene/DiscardMissingTileImagePolicy.js#L22">Scene/DiscardMissingTileImagePolicy.js 22</a>
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</div>
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</h4>
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</div>
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<div class="description">
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A policy for discarding tile images that match a known image containing a
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"missing" image.
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</div>
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<table class="params">
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<thead>
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<tr>
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<th>Name</th>
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<th>Type</th>
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<th class="last">Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td class="name"><code>options</code></td>
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<td class="type">
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<span class="param-type">Object</span>
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</td>
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<td class="description last">
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Object with the following properties:
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<table class="params">
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<thead>
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<tr>
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<th>Name</th>
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<th>Type</th>
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<th>Default</th>
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<th class="last">Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td class="name"><code>missingImageUrl</code></td>
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<td class="type">
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<span class="param-type"><a href="Resource.html">Resource</a></span>
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<span class="param-type">String</span>
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</td>
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<td class="default">
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</td>
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<td class="description last">
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The URL of the known missing image.</td>
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</tr>
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<tr>
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<td class="name"><code>pixelsToCheck</code></td>
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<td class="type">
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<span class="param-type">Array.<<a href="Cartesian2.html">Cartesian2</a>></span>
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</td>
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<td class="default">
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</td>
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<td class="description last">
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An array of <a href="Cartesian2.html"><code>Cartesian2</code></a> pixel positions to
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compare against the missing image.</td>
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</tr>
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<tr>
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<td class="name"><code>disableCheckIfAllPixelsAreTransparent</code></td>
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<td class="type">
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<span class="param-type">Boolean</span>
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</td>
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<td class="default">
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<code class="language-javascript">false</code>
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</td>
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<td class="description last">
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<span class="optional">optional</span>
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If true, the discard check will be disabled
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if all of the pixelsToCheck in the missingImageUrl have an alpha value of 0. If false, the
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discard check will proceed no matter the values of the pixelsToCheck.</td>
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</tr>
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</tbody>
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</table>
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</td>
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</tr>
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</tbody>
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</table>
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<dl class="details">
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</dl>
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</div>
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<h3 class="subsection-title">Methods</h3>
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<div class="nameContainer">
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<h4 class="name" id="isReady">
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<a href="#isReady" class="doc-link"></a>
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isReady<span class="signature">()</span> → <span class="type-signature returnType">Boolean</span>
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<div class="source-link rightLinks">
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<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Scene/DiscardMissingTileImagePolicy.js#L100">Scene/DiscardMissingTileImagePolicy.js 100</a>
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</div>
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</h4>
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</div>
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<div class="description">
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Determines if the discard policy is ready to process images.
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</div>
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<h5>Returns:</h5>
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<div class="param-desc">
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True if the discard policy is ready to process images; otherwise, false.
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</div>
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<dl class="details">
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</dl>
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<div class="nameContainer">
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<h4 class="name" id="shouldDiscardImage">
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<a href="#shouldDiscardImage" class="doc-link"></a>
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shouldDiscardImage<span class="signature">(image)</span> → <span class="type-signature returnType">Boolean</span>
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<div class="source-link rightLinks">
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<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Scene/DiscardMissingTileImagePolicy.js#L112">Scene/DiscardMissingTileImagePolicy.js 112</a>
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</div>
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</h4>
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</div>
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<div class="description">
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Given a tile image, decide whether to discard that image.
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</div>
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<table class="params">
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<thead>
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<tr>
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<th>Name</th>
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<th>Type</th>
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<th class="last">Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td class="name"><code>image</code></td>
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<td class="type">
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<span class="param-type">HTMLImageElement</span>
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</td>
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<td class="description last">
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An image to test.</td>
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</tr>
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</tbody>
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</table>
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<h5>Returns:</h5>
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<div class="param-desc">
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True if the image should be discarded; otherwise, false.
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</div>
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<h5>Throws:</h5>
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<ul>
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<li>
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<div class="param-desc">
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<span class="param-type"><a href="DeveloperError.html">DeveloperError</a></span>
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: <code>shouldDiscardImage</code> must not be called before the discard policy is ready.
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</div>
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</li>
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</ul>
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<dl class="details">
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