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707 lines
57 KiB
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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>ConditionsExpression - Cesium Documentation</title>
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<script src="javascript/html5.js"></script>
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<![endif]-->
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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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ConditionsExpression
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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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<div class="container-overview">
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<div class="nameContainer">
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<h4 class="name" id="ConditionsExpression">
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<a href="#ConditionsExpression" class="doc-link"></a>
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new Cesium.ConditionsExpression<span class="signature">(<span class="optional">conditionsExpression</span>, <span class="optional">defines</span>)</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/ConditionsExpression.js#L31">Scene/ConditionsExpression.js 31</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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An expression for a style applied to a <a href="Cesium3DTileset.html"><code>Cesium3DTileset</code></a>.
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<p>
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Evaluates a conditions expression defined using the
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<a href="https://github.com/CesiumGS/3d-tiles/tree/main/specification/Styling">3D Tiles Styling language</a>.
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</p>
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<p>
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Implements the <a href="StyleExpression.html"><code>StyleExpression</code></a> interface.
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</p>
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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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</thead>
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<tbody>
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<tr>
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<td class="name"><code>conditionsExpression</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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<span class="optional">optional</span>
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The conditions expression defined using the 3D Tiles Styling language.</td>
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</tr>
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<tr>
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<td class="name"><code>defines</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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<span class="optional">optional</span>
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Defines in the style.</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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<h5>Example:</h5>
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<pre><code class="language-javascript">const expression = new Cesium.ConditionsExpression({
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conditions : [
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['${Area} > 10, 'color("#FF0000")'],
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['${id} !== "1"', 'color("#00FF00")'],
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['true', 'color("#FFFFFF")']
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]
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});
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expression.evaluateColor(feature, result); // returns a Cesium.Color object</code></pre>
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</dl>
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</div>
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<h3 class="subsection-title">Members</h3>
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<div class="nameContainer">
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<h4 class="name" id="conditionsExpression">
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<a href="#conditionsExpression" class="doc-link"></a>
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<span class="type-signature attribute-readonly">readonly</span> conditionsExpression<span class="type-signature"> : Object</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/ConditionsExpression.js#L50">Scene/ConditionsExpression.js 50</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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Gets the conditions expression defined in the 3D Tiles Styling language.
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</div>
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<dl class="details">
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<span class="details-header">Default Value:</span>
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<code class="language-javascript">undefined</code>
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</dl>
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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="evaluate">
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<a href="#evaluate" class="doc-link"></a>
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evaluate<span class="signature">(feature, <span class="optional">result</span>)</span> → <span class="type-signature returnType">Boolean|Number|String|RegExp|<a href="Cartesian2.html">Cartesian2</a>|<a href="Cartesian3.html">Cartesian3</a>|<a href="Cartesian4.html">Cartesian4</a>|<a href="Color.html">Color</a></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/ConditionsExpression.js#L97">Scene/ConditionsExpression.js 97</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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Evaluates the result of an expression, optionally using the provided feature's properties. If the result of
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the expression in the
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<a href="https://github.com/CesiumGS/3d-tiles/tree/main/specification/Styling">3D Tiles Styling language</a>
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is of type <code>Boolean</code>, <code>Number</code>, or <code>String</code>, the corresponding JavaScript
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primitive type will be returned. If the result is a <code>RegExp</code>, a Javascript <code>RegExp</code>
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object will be returned. If the result is a <code>Cartesian2</code>, <code>Cartesian3</code>, or <code>Cartesian4</code>,
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a <a href="Cartesian2.html"><code>Cartesian2</code></a>, <a href="Cartesian3.html"><code>Cartesian3</code></a>, or <a href="Cartesian4.html"><code>Cartesian4</code></a> object will be returned. If the <code>result</code> argument is
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a <a href="Color.html"><code>Color</code></a>, the <a href="Cartesian4.html"><code>Cartesian4</code></a> value is converted to a <a href="Color.html"><code>Color</code></a> and then returned.
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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>feature</code></td>
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<td class="type">
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<span class="param-type"><a href="Cesium3DTileFeature.html">Cesium3DTileFeature</a></span>
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</td>
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<td class="description last">
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The feature whose properties may be used as variables in the expression.</td>
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</tr>
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<tr>
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<td class="name"><code>result</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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<span class="optional">optional</span>
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The object onto which to store the result.</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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The result of evaluating the expression.
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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="evaluateColor">
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<a href="#evaluateColor" class="doc-link"></a>
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evaluateColor<span class="signature">(feature, <span class="optional">result</span>)</span> → <span class="type-signature returnType"><a href="Color.html">Color</a></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/ConditionsExpression.js#L120">Scene/ConditionsExpression.js 120</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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Evaluates the result of a Color expression, using the values defined by a feature.
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<p>
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This is equivalent to <a href="ConditionsExpression.html#evaluate"><code>ConditionsExpression#evaluate</code></a> but always returns a <a href="Color.html"><code>Color</code></a> object.
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</p>
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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>feature</code></td>
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<td class="type">
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<span class="param-type"><a href="Cesium3DTileFeature.html">Cesium3DTileFeature</a></span>
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</td>
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<td class="description last">
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The feature whose properties may be used as variables in the expression.</td>
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</tr>
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<tr>
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<td class="name"><code>result</code></td>
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<td class="type">
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<span class="param-type"><a href="Color.html">Color</a></span>
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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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The object in which to store the result</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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The modified result parameter or a new Color instance if one was not provided.
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