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删除不必要的冗余文件,上传部分示例数据
2020-06-29 11:14:44 +08:00
<!DOCTYPE html>
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<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<title>GroundPolylinePrimitive - Cesium Documentation</title>
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</head>
<body>
<div id="main">
<h1 class="page-title">
<a href="index.html"><img src="Images/CesiumLogo.png" class="cesiumLogo"></a>
GroundPolylinePrimitive
<div class="titleCenterer"></div>
</h1>
<section>
<header>
</header>
<article>
<div class="container-overview">
<div class="nameContainer">
<h4 class="name" id="GroundPolylinePrimitive">
<a href="#GroundPolylinePrimitive" class="doc-link"></a>
new Cesium.GroundPolylinePrimitive<span class="signature">(<span class="optional">options</span>)</span>
<div class="source-link rightLinks">
<a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.58/Source/Scene/GroundPolylinePrimitive.js#L135">Scene/GroundPolylinePrimitive.js 135</a>
</div>
</h4>
</div>
<div class="description">
A GroundPolylinePrimitive represents a polyline draped over the terrain or 3D Tiles in the <a href="Scene.html"><code>Scene</code></a>. <p> Only to be used with GeometryInstances containing <a href="GroundPolylineGeometry.html"><code>GroundPolylineGeometry</code></a>. </p>
</div>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>options</code></td>
<td class="type">
<span class="param-type">Object</span>
</td>
<td class="description last">
<span class="optional">optional</span>
Object with the following properties:
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Default</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>geometryInstances</code></td>
<td class="type">
<span class="param-type">Array</span>
|
<span class="param-type"><a href="GeometryInstance.html">GeometryInstance</a></span>
</td>
<td class="default">
</td>
<td class="description last">
<span class="optional">optional</span>
GeometryInstances containing GroundPolylineGeometry</td>
</tr>
<tr>
<td class="name"><code>appearance</code></td>
<td class="type">
<span class="param-type"><a href="Appearance.html">Appearance</a></span>
</td>
<td class="default">
</td>
<td class="description last">
<span class="optional">optional</span>
The Appearance used to render the polyline. Defaults to a white color <a href="Material.html"><code>Material</code></a> on a <a href="PolylineMaterialAppearance.html"><code>PolylineMaterialAppearance</code></a>.</td>
</tr>
<tr>
<td class="name"><code>show</code></td>
<td class="type">
<span class="param-type">Boolean</span>
</td>
<td class="default">
<code class="language-javascript">true</code>
</td>
<td class="description last">
<span class="optional">optional</span>
Determines if this primitive will be shown.</td>
</tr>
<tr>
<td class="name"><code>interleave</code></td>
<td class="type">
<span class="param-type">Boolean</span>
</td>
<td class="default">
<code class="language-javascript">false</code>
</td>
<td class="description last">
<span class="optional">optional</span>
When <code>true</code>, geometry vertex attributes are interleaved, which can slightly improve rendering performance but increases load time.</td>
</tr>
<tr>
<td class="name"><code>releaseGeometryInstances</code></td>
<td class="type">
<span class="param-type">Boolean</span>
</td>
<td class="default">
<code class="language-javascript">true</code>
</td>
<td class="description last">
<span class="optional">optional</span>
When <code>true</code>, the primitive does not keep a reference to the input <code>geometryInstances</code> to save memory.</td>
</tr>
<tr>
<td class="name"><code>allowPicking</code></td>
<td class="type">
<span class="param-type">Boolean</span>
</td>
<td class="default">
<code class="language-javascript">true</code>
</td>
<td class="description last">
<span class="optional">optional</span>
When <code>true</code>, each geometry instance will only be pickable with <a href="Scene.html#pick"><code>Scene#pick</code></a>. When <code>false</code>, GPU memory is saved.</td>
</tr>
<tr>
<td class="name"><code>asynchronous</code></td>
<td class="type">
<span class="param-type">Boolean</span>
</td>
<td class="default">
<code class="language-javascript">true</code>
</td>
<td class="description last">
<span class="optional">optional</span>
Determines if the primitive will be created asynchronously or block until ready. If false initializeTerrainHeights() must be called first.</td>
</tr>
<tr>
<td class="name"><code>classificationType</code></td>
<td class="type">
<span class="param-type"><a href="ClassificationType.html">ClassificationType</a></span>
</td>
<td class="default">
<code class="language-javascript">ClassificationType.BOTH</code>
</td>
<td class="description last">
<span class="optional">optional</span>
Determines whether terrain, 3D Tiles or both will be classified.</td>
</tr>
<tr>
<td class="name"><code>debugShowBoundingVolume</code></td>
<td class="type">
<span class="param-type">Boolean</span>
</td>
<td class="default">
<code class="language-javascript">false</code>
</td>
<td class="description last">
<span class="optional">optional</span>
For debugging only. Determines if this primitive's commands' bounding spheres are shown.</td>
</tr>
<tr>
<td class="name"><code>debugShowShadowVolume</code></td>
<td class="type">
<span class="param-type">Boolean</span>
</td>
<td class="default">
<code class="language-javascript">false</code>
</td>
<td class="description last">
<span class="optional">optional</span>
For debugging only. Determines if the shadow volume for each geometry in the primitive is drawn. Must be <code>true</code> on creation to have effect.</td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
<dl class="details">
<h5>Example:</h5>
<pre><code class="language-javascript">// 1. Draw a polyline on terrain with a basic color material var instance = new Cesium.GeometryInstance({ geometry : new Cesium.GroundPolylineGeometry({ positions : Cesium.Cartesian3.fromDegreesArray([ -112.1340164450331, 36.05494287836128, -112.08821010582645, 36.097804071380715 ]), width : 4.0 }), id : 'object returned when this instance is picked and to get/set per-instance attributes' }); scene.groundPrimitives.add(new Cesium.GroundPolylinePrimitive({ geometryInstances : instance, appearance : new Cesium.PolylineMaterialAppearance({ material : Cesium.Material.fromType('Color') }) })); // 2. Draw a looped polyline on terrain with per-instance color and a distance display condition. // Distance display conditions for polylines on terrain are based on an approximate terrain height // instead of true terrain height. var instance = new Cesium.GeometryInstance({ geometry : new Cesium.GroundPolylineGeometry({ positions : Cesium.Cartesian3.fromDegreesArray([ -112.1340164450331, 36.05494287836128, -112.08821010582645, 36.097804071380715, -112.13296079730024, 36.168769146801104 ]), loop : true, width : 4.0 }), attributes : { color : Cesium.ColorGeometryInstanceAttribute.fromColor(Cesium.Color.fromCssColorString('green').withAlpha(0.7)),
distanceDisplayCondition : new Cesium.DistanceDisplayConditionGeometryInstanceAttribute(1000, 30000) }, id : 'object returned when this instance is picked and to get/set per-instance attributes' }); scene.groundPrimitives.add(new Cesium.GroundPolylinePrimitive({ geometryInstances : instance, appearance : Cesium.PolylineColorAppearance() }));</code></pre>
</dl>
</div>
<h3 class="subsection-title">Members</h3>
<div class="nameContainer">
<h4 class="name" id="allowPicking">
<a href="#allowPicking" class="doc-link"></a>
<span class="type-signature attribute-readonly">readonly</span>allowPicking<span class="type-signature"> : Boolean</span>
<div class="source-link rightLinks">
<a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.58/Source/Scene/GroundPolylinePrimitive.js#L289">Scene/GroundPolylinePrimitive.js 289</a>
</div>
</h4>
</div>
<div class="description">
When <code>true</code>, each geometry instance will only be pickable with <a href="Scene.html#pick"><code>Scene#pick</code></a>. When <code>false</code>, GPU memory is saved.
</div>
<dl class="details">
<span class="details-header">Default Value:</span>
<code class="language-javascript">true</code>
</dl>
<div class="nameContainer">
<h4 class="name" id="appearance">
<a href="#appearance" class="doc-link"></a>
appearance<span class="type-signature"> : <a href="Appearance.html">Appearance</a></span>
<div class="source-link rightLinks">
<a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.58/Source/Scene/GroundPolylinePrimitive.js#L168">Scene/GroundPolylinePrimitive.js 168</a>
</div>
</h4>
</div>
<div class="description">
The <a href="Appearance.html"><code>Appearance</code></a> used to shade this primitive. Each geometry instance is shaded with the same appearance. Some appearances, like <a href="PolylineColorAppearance.html"><code>PolylineColorAppearance</code></a> allow giving each instance unique properties.
</div>
<dl class="details">
<span class="details-header">Default Value:</span>
<code class="language-javascript">undefined</code>
</dl>
<div class="nameContainer">
<h4 class="name" id="asynchronous">
<a href="#asynchronous" class="doc-link"></a>
<span class="type-signature attribute-readonly">readonly</span>asynchronous<span class="type-signature"> : Boolean</span>
<div class="source-link rightLinks">
<a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.58/Source/Scene/GroundPolylinePrimitive.js#L305">Scene/GroundPolylinePrimitive.js 305</a>
</div>
</h4>
</div>
<div class="description">
Determines if the geometry instances will be created and batched on a web worker.
</div>
<dl class="details">
<span class="details-header">Default Value:</span>
<code class="language-javascript">true</code>
</dl>
<div class="nameContainer">
<h4 class="name" id="classificationType">
<a href="#classificationType" class="doc-link"></a>
classificationType<span class="type-signature"> : <a href="ClassificationType.html">ClassificationType</a></span>
<div class="source-link rightLinks">
<a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.58/Source/Scene/GroundPolylinePrimitive.js#L187">Scene/GroundPolylinePrimitive.js 187</a>
</div>
</h4>
</div>
<div class="description">
Determines whether terrain, 3D Tiles or both will be classified.
</div>
<dl class="details">
<span class="details-header">Default Value:</span>
<code class="language-javascript">ClassificationType.BOTH</code>
</dl>
<div class="nameContainer">
<h4 class="name" id="debugShowBoundingVolume">
<a href="#debugShowBoundingVolume" class="doc-link"></a>
debugShowBoundingVolume<span class="type-signature"> : Boolean</span>
<div class="source-link rightLinks">
<a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.58/Source/Scene/GroundPolylinePrimitive.js#L199">Scene/GroundPolylinePrimitive.js 199</a>
</div>
</h4>
</div>
<div class="description">
This property is for debugging only; it is not for production use nor is it optimized. <p> Draws the bounding sphere for each draw command in the primitive. </p>
</div>
<dl class="details">
<span class="details-header">Default Value:</span>
<code class="language-javascript">false</code>
</dl>
<div class="nameContainer">
<h4 class="name" id="debugShowShadowVolume">
<a href="#debugShowShadowVolume" class="doc-link"></a>
<span class="type-signature attribute-readonly">readonly</span>debugShowShadowVolume<span class="type-signature"> : Boolean</span>
<div class="source-link rightLinks">
<a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.58/Source/Scene/GroundPolylinePrimitive.js#L352">Scene/GroundPolylinePrimitive.js 352</a>
</div>
</h4>
</div>
<div class="description">
This property is for debugging only; it is not for production use nor is it optimized. <p> If true, draws the shadow volume for each geometry in the primitive. </p>
</div>
<dl class="details">
<span class="details-header">Default Value:</span>
<code class="language-javascript">false</code>
</dl>
<div class="nameContainer">
<h4 class="name" id="geometryInstances">
<a href="#geometryInstances" class="doc-link"></a>
<span class="type-signature attribute-readonly">readonly</span>geometryInstances<span class="type-signature"> : Array|<a href="GeometryInstance.html">GeometryInstance</a></span>
<div class="source-link rightLinks">
<a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.58/Source/Scene/GroundPolylinePrimitive.js#L151">Scene/GroundPolylinePrimitive.js 151</a>
</div>
</h4>
</div>
<div class="description">
The geometry instances rendered with this primitive. This may be <code>undefined</code> if <code>options.releaseGeometryInstances</code> is <code>true</code> when the primitive is constructed. <p> Changing this property after the primitive is rendered has no effect. </p>
</div>
<dl class="details">
<span class="details-header">Default Value:</span>
<code class="language-javascript">undefined</code>
</dl>
<div class="nameContainer">
<h4 class="name" id="interleave">
<a href="#interleave" class="doc-link"></a>
<span class="type-signature attribute-readonly">readonly</span>interleave<span class="type-signature"> : Boolean</span>
<div class="source-link rightLinks">
<a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.58/Source/Scene/GroundPolylinePrimitive.js#L257">Scene/GroundPolylinePrimitive.js 257</a>
</div>
</h4>
</div>
<div class="description">
Determines if geometry vertex attributes are interleaved, which can slightly improve rendering performance.
</div>
<dl class="details">
<span class="details-header">Default Value:</span>
<code class="language-javascript">false</code>
</dl>
<div class="nameContainer">
<h4 class="name" id="ready">
<a href="#ready" class="doc-link"></a>
<span class="type-signature attribute-readonly">readonly</span>ready<span class="type-signature"> : Boolean</span>
<div class="source-link rightLinks">
<a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.58/Source/Scene/GroundPolylinePrimitive.js#L321">Scene/GroundPolylinePrimitive.js 321</a>
</div>
</h4>
</div>
<div class="description">
Determines if the primitive is complete and ready to render. If this property is true, the primitive will be rendered the next time that <a href="GroundPolylinePrimitive.html#update"><code>GroundPolylinePrimitive#update</code></a> is called.
</div>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="readyPromise">
<a href="#readyPromise" class="doc-link"></a>
<span class="type-signature attribute-readonly">readonly</span>readyPromise<span class="type-signature"> : Promise.&lt;<a href="GroundPolylinePrimitive.html">GroundPolylinePrimitive</a>></span>
<div class="source-link rightLinks">
<a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.58/Source/Scene/GroundPolylinePrimitive.js#L333">Scene/GroundPolylinePrimitive.js 333</a>
</div>
</h4>
</div>
<div class="description">
Gets a promise that resolves when the primitive is ready to render.
</div>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="releaseGeometryInstances">
<a href="#releaseGeometryInstances" class="doc-link"></a>
<span class="type-signature attribute-readonly">readonly</span>releaseGeometryInstances<span class="type-signature"> : Boolean</span>
<div class="source-link rightLinks">
<a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.58/Source/Scene/GroundPolylinePrimitive.js#L273">Scene/GroundPolylinePrimitive.js 273</a>
</div>
</h4>
</div>
<div class="description">
When <code>true</code>, the primitive does not keep a reference to the input <code>geometryInstances</code> to save memory.
</div>
<dl class="details">
<span class="details-header">Default Value:</span>
<code class="language-javascript">true</code>
</dl>
<div class="nameContainer">
<h4 class="name" id="show">
<a href="#show" class="doc-link"></a>
show<span class="type-signature"> : Boolean</span>
<div class="source-link rightLinks">
<a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.58/Source/Scene/GroundPolylinePrimitive.js#L178">Scene/GroundPolylinePrimitive.js 178</a>
</div>
</h4>
</div>
<div class="description">
Determines if the primitive will be shown. This affects all geometry instances in the primitive.
</div>
<dl class="details">
<span class="details-header">Default Value:</span>
<code class="language-javascript">true</code>
</dl>
<h3 class="subsection-title">Methods</h3>
<div class="nameContainer">
<h4 class="name" id=".initializeTerrainHeights">
<a href="#.initializeTerrainHeights" class="doc-link"></a>
<span class="type-signature attribute-static">static</span>Cesium.GroundPolylinePrimitive.initializeTerrainHeights<span class="signature">()</span> &rarr; <span class="type-signature returnType">Promise</span>
<div class="source-link rightLinks">
<a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.58/Source/Scene/GroundPolylinePrimitive.js#L365">Scene/GroundPolylinePrimitive.js 365</a>
</div>
</h4>
</div>
<div class="description">
Initializes the minimum and maximum terrain heights. This only needs to be called if you are creating the GroundPolylinePrimitive synchronously.
</div>
<h5>Returns:</h5>
<div class="param-desc">
A promise that will resolve once the terrain heights have been loaded.
</div>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id=".isSupported">
<a href="#.isSupported" class="doc-link"></a>
<span class="type-signature attribute-static">static</span>Cesium.GroundPolylinePrimitive.isSupported<span class="signature">(scene)</span> &rarr; <span class="type-signature returnType">Boolean</span>
<div class="source-link rightLinks">
<a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.58/Source/Scene/GroundPolylinePrimitive.js#L750">Scene/GroundPolylinePrimitive.js 750</a>
</div>
</h4>
</div>
<div class="description">
Checks if the given Scene supports GroundPolylinePrimitives. GroundPolylinePrimitives require support for the WEBGL_depth_texture extension.
</div>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>scene</code></td>
<td class="type">
<span class="param-type"><a href="Scene.html">Scene</a></span>
</td>
<td class="description last">
The current scene.</td>
</tr>
</tbody>
</table>
<h5>Returns:</h5>
<div class="param-desc">
Whether or not the current scene supports GroundPolylinePrimitives.
</div>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="destroy">
<a href="#destroy" class="doc-link"></a>
destroy<span class="signature">()</span>
<div class="source-link rightLinks">
<a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.58/Source/Scene/GroundPolylinePrimitive.js#L785">Scene/GroundPolylinePrimitive.js 785</a>
</div>
</h4>
</div>
<div class="description">
Destroys the WebGL resources held by this object. Destroying an object allows for deterministic release of WebGL resources, instead of relying on the garbage collector to destroy this object. <p> Once an object is destroyed, it should not be used; calling any function other than <code>isDestroyed</code> will result in a <a href="DeveloperError.html"><code>DeveloperError</code></a> exception. Therefore, assign the return value (<code>undefined</code>) to the object as done in the example. </p>
</div>
<h5>Throws:</h5>
<ul>
<li>
<div class="param-desc">
<span class="param-type"><a href="DeveloperError.html">DeveloperError</a></span>
: This object was destroyed, i.e., destroy() was called.
</div>
</li>
</ul>
<dl class="details">
<h5>Example:</h5>
<pre><code class="language-javascript">e = e &amp;&amp; e.destroy();</code></pre>
<h5>See:</h5>
<ul class="see-list">
<li><a href="GroundPolylinePrimitive.html#isDestroyed">GroundPolylinePrimitive#isDestroyed</a></li>
</ul>
</dl>
<div class="nameContainer">
<h4 class="name" id="getGeometryInstanceAttributes">
<a href="#getGeometryInstanceAttributes" class="doc-link"></a>
getGeometryInstanceAttributes<span class="signature">(id)</span> &rarr; <span class="type-signature returnType">Object</span>
<div class="source-link rightLinks">
<a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.58/Source/Scene/GroundPolylinePrimitive.js#L734">Scene/GroundPolylinePrimitive.js 734</a>
</div>
</h4>
</div>
<div class="description">
Returns the modifiable per-instance attributes for a <a href="GeometryInstance.html"><code>GeometryInstance</code></a>.
</div>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>id</code></td>
<td class="type">
<span class="param-type">*</span>
</td>
<td class="description last">
The id of the <a href="GeometryInstance.html"><code>GeometryInstance</code></a>.</td>
</tr>
</tbody>
</table>
<h5>Returns:</h5>
<div class="param-desc">
The typed array in the attribute's format or undefined if the is no instance with id.
</div>
<h5>Throws:</h5>
<ul>
<li>
<div class="param-desc">
<span class="param-type"><a href="DeveloperError.html">DeveloperError</a></span>
: must call update before calling getGeometryInstanceAttributes.
</div>
</li>
</ul>
<dl class="details">
<h5>Example:</h5>
<pre><code class="language-javascript">var attributes = primitive.getGeometryInstanceAttributes('an id'); attributes.color = Cesium.ColorGeometryInstanceAttribute.toValue(Cesium.Color.AQUA); attributes.show = Cesium.ShowGeometryInstanceAttribute.toValue(true);</code></pre>
</dl>
<div class="nameContainer">
<h4 class="name" id="isDestroyed">
<a href="#isDestroyed" class="doc-link"></a>
isDestroyed<span class="signature">()</span> &rarr; <span class="type-signature returnType">Boolean</span>
<div class="source-link rightLinks">
<a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.58/Source/Scene/GroundPolylinePrimitive.js#L765">Scene/GroundPolylinePrimitive.js 765</a>
</div>
</h4>
</div>
<div class="description">
Returns true if this object was destroyed; otherwise, false. <p> If this object was destroyed, it should not be used; calling any function other than <code>isDestroyed</code> will result in a <a href="DeveloperError.html"><code>DeveloperError</code></a> exception. </p>
</div>
<h5>Returns:</h5>
<div class="param-desc">
<code>true</code> if this object was destroyed; otherwise, <code>false</code>.
</div>
<dl class="details">
<h5>See:</h5>
<ul class="see-list">
<li><a href="GroundPolylinePrimitive.html#destroy">GroundPolylinePrimitive#destroy</a></li>
</ul>
</dl>
<div class="nameContainer">
<h4 class="name" id="update">
<a href="#update" class="doc-link"></a>
update<span class="signature">()</span>
<div class="source-link rightLinks">
<a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.58/Source/Scene/GroundPolylinePrimitive.js#L614">Scene/GroundPolylinePrimitive.js 614</a>
</div>
</h4>
</div>
<div class="description">
Called when <a href="Viewer.html"><code>Viewer</code></a> or <a href="CesiumWidget.html"><code>CesiumWidget</code></a> render the scene to get the draw commands needed to render this primitive. <p> Do not call this function directly. This is documented just to list the exceptions that may be propagated when the scene is rendered: </p>
</div>
<h5>Throws:</h5>
<ul>
<li>
<div class="param-desc">
<span class="param-type"><a href="DeveloperError.html">DeveloperError</a></span>
: For synchronous GroundPolylinePrimitives, you must call GroundPolylinePrimitives.initializeTerrainHeights() and wait for the returned promise to resolve.
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<li>
<div class="param-desc">
<span class="param-type"><a href="DeveloperError.html">DeveloperError</a></span>
: All GeometryInstances must have color attributes to use PolylineColorAppearance with GroundPolylinePrimitive.
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