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							<!DOCTYPE html>
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    <title>LabelCollection - Cesium Documentation</title>

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<div id="main">

    <h1 class="page-title">
        <a href="index.html"><img src="images/CesiumLogo.png" class="cesiumLogo"></a>
        LabelCollection
        <div class="titleCenterer"></div>
    </h1>

    
<section>

<header>
    
</header>

<article>
    <div class="container-overview">
    

<dt>
    <div class="nameContainer">
    <h4 class="name" id="LabelCollection">
        <a href="#LabelCollection" class="doc-link"></a>
        new Cesium.LabelCollection<span class="signature">(<span class="optional">options</span>)</span>
        

<div class="source-link rightLinks">
    <a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.29/Source/Scene/LabelCollection.js#L468">Scene/LabelCollection.js 468</a>
</div>


    </h4>

    </div>

    
</dt>
<dd>

    
    <div class="description">
        A renderable collection of labels.  Labels are viewport-aligned text positioned in the 3D scene.
Each label can have a different font, color, scale, etc.
<br /><br />
<div align='center'>
<img src='images/Label.png' width='400' height='300' /><br />
Example labels
</div>
<br /><br />
Labels are added and removed from the collection using <a href="LabelCollection.html#add"><code>LabelCollection#add</code></a>
and <a href="LabelCollection.html#remove"><code>LabelCollection#remove</code></a>.
    </div>
    

        <h5>Performance:</h5>
        <p class="description">For best performance, prefer a few collections, each with many labels, to
many collections with only a few labels each.  Avoid having collections where some
labels change every frame and others do not; instead, create one or more collections
for static labels, and one or more collections for dynamic labels.</p>
    

<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>modelMatrix</code></td>
            

            <td class="type">
            
                
<span class="param-type"><a href="Matrix4.html">Matrix4</a></span>


            </td>

            
                <td class="default">
                
                    <code class="language-javascript">Matrix4.IDENTITY</code>
                
                </td>
            

            <td class="description last">
            
                
                        <span class="optional">optional</span>
                
                
                The 4x4 transformation matrix that transforms each label from model to world coordinates.</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>scene</code></td>
            

            <td class="type">
            
                
<span class="param-type"><a href="Scene.html">Scene</a></span>


            </td>

            
                <td class="default">
                
                </td>
            

            <td class="description last">
            
                
                        <span class="optional">optional</span>
                
                
                Must be passed in for labels that use the height reference property or will be depth tested against the globe.</td>
        </tr>

    
    </tbody>
</table>
            </td>
        </tr>

    
    </tbody>
</table>
    

<dl class="details">
    

        <h5>Example:</h5>
        
    <pre><code class="language-javascript">// Create a label collection with two labels
var labels = scene.primitives.add(new Cesium.LabelCollection());
labels.add({
  position : new Cesium.Cartesian3(1.0, 2.0, 3.0),
  text : 'A label'
});
labels.add({
  position : new Cesium.Cartesian3(4.0, 5.0, 6.0),
  text : 'Another label'
});</code></pre>

    
    <h5>Demo:</h5>
    <ul class="see-list">
        <li><a href="http://cesiumjs.org/Cesium/Apps/Sandcastle/index.html?src=Labels.html">Cesium Sandcastle Labels Demo</a></li>
    </ul>
    

    <h5>See:</h5>
    <ul class="see-list">
        <li><a href="LabelCollection.html#add">LabelCollection#add</a></li>
    
        <li><a href="LabelCollection.html#remove">LabelCollection#remove</a></li>
    
        <li><a href="Label.html">Label</a></li>
    
        <li><a href="BillboardCollection.html">BillboardCollection</a></li>
    </ul>
    

</dl>

</dd>

    
    </div>

    
        <h3 class="subsection-title">Members</h3>

        <dl>
            
<dt>
    <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/1.29/Source/Scene/LabelCollection.js#L535">Scene/LabelCollection.js 535</a>
</div>


    </h4>

    </div>

    
</dt>
<dd>
    
    <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>

</dd>

        
<dt>
    <div class="nameContainer">
    <h4 class="name" id="length">
        <a href="#length" class="doc-link"></a>
        length<span class="type-signature"> : Number</span>
        

<div class="source-link rightLinks">
    <a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.29/Source/Scene/LabelCollection.js#L546">Scene/LabelCollection.js 546</a>
</div>


    </h4>

    </div>

    
</dt>
<dd>
    
    <div class="description">
        Returns the number of labels in this collection.  This is commonly used with
<a href="LabelCollection.html#get"><code>LabelCollection#get</code></a> to iterate over all the labels
in the collection.
    </div>
    

<dl class="details">
    

</dl>

</dd>

        
<dt>
    <div class="nameContainer">
    <h4 class="name" id="modelMatrix">
        <a href="#modelMatrix" class="doc-link"></a>
        modelMatrix<span class="type-signature"> : <a href="Matrix4.html">Matrix4</a></span>
        

<div class="source-link rightLinks">
    <a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.29/Source/Scene/LabelCollection.js#L523">Scene/LabelCollection.js 523</a>
</div>


    </h4>

    </div>

    
</dt>
<dd>
    
    <div class="description">
        The 4x4 transformation matrix that transforms each label in this collection from model to world coordinates.
When this is the identity matrix, the labels are drawn in world coordinates, i.e., Earth's WGS84 coordinates.
Local reference frames can be used by providing a different transformation matrix, like that returned
by <a href="Transforms.html#.eastNorthUpToFixedFrame"><code>Transforms.eastNorthUpToFixedFrame</code></a>.
    </div>
    

<dl class="details">
    

    <span class="details-header">Default Value:</span>
    <code class="language-javascript"><a href="Matrix4.html#.IDENTITY"><code>Matrix4.IDENTITY</code></a></code>
    

        <h5>Example:</h5>
        
    <pre><code class="language-javascript">var center = Cesium.Cartesian3.fromDegrees(-75.59777, 40.03883);
labels.modelMatrix = Cesium.Transforms.eastNorthUpToFixedFrame(center);
labels.add({
  position : new Cesium.Cartesian3(0.0, 0.0, 0.0),
  text     : 'Center'
});
labels.add({
  position : new Cesium.Cartesian3(1000000.0, 0.0, 0.0),
  text     : 'East'
});
labels.add({
  position : new Cesium.Cartesian3(0.0, 1000000.0, 0.0),
  text     : 'North'
});
labels.add({
  position : new Cesium.Cartesian3(0.0, 0.0, 1000000.0),
  text     : 'Up'
});</code></pre>

    
</dl>

</dd>

        </dl>
    

        <h3 class="subsection-title">Methods</h3>

        <dl>
            
<dt>
    <div class="nameContainer">
    <h4 class="name" id="add">
        <a href="#add" class="doc-link"></a>
        add<span class="signature">(<span class="optional">options</span>)</span> &rarr; <span class="type-signature returnType"><a href="Label.html">Label</a></span>
        

<div class="source-link rightLinks">
    <a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.29/Source/Scene/LabelCollection.js#L605">Scene/LabelCollection.js 605</a>
</div>


    </h4>

    </div>

    
</dt>
<dd>

    
    <div class="description">
        Creates and adds a label with the specified initial properties to the collection.
The added label is returned so it can be modified or removed from the collection later.
    </div>
    

        <h5>Performance:</h5>
        <p class="description">Calling <code>add</code> is expected constant time.  However, the collection's vertex buffer
is rewritten; this operations is <code>O(n)</code> and also incurs
CPU to GPU overhead.  For best performance, add as many billboards as possible before
calling <code>update</code>.</p>
    

<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>
                
                
                A template describing the label's properties as shown in Example 1.</td>
        </tr>

    
    </tbody>
</table>
    

    <h5>Returns:</h5>
    
            
<div class="param-desc">
    The label that was added to the collection.
</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>Examples:</h5>
        
    <pre><code class="language-javascript">// Example 1:  Add a label, specifying all the default values.
var l = labels.add({
  show : true,
  position : Cesium.Cartesian3.ZERO,
  text : '',
  font : '30px sans-serif',
  fillColor : Cesium.Color.WHITE,
  outlineColor : Cesium.Color.BLACK,
  outlineWidth : 1.0,
  showBackground : false,
  backgroundColor : new Cesium.Color(0.165, 0.165, 0.165, 0.8),
  backgroundPadding : new Cesium.Cartesian2(7, 5),
  style : Cesium.LabelStyle.FILL,
  pixelOffset : Cesium.Cartesian2.ZERO,
  eyeOffset : Cesium.Cartesian3.ZERO,
  horizontalOrigin : Cesium.HorizontalOrigin.LEFT,
  verticalOrigin : Cesium.VerticalOrigin.BASELINE,
  scale : 1.0,
  translucencyByDistance : undefined,
  pixelOffsetScaleByDistance : undefined,
  heightReference : HeightReference.NONE,
  distanceDisplayCondition : undefined
});</code></pre>

    <pre><code class="language-javascript">// Example 2:  Specify only the label's cartographic position,
// text, and font.
var l = labels.add({
  position : Cesium.Cartesian3.fromRadians(longitude, latitude, height),
  text : 'Hello World',
  font : '24px Helvetica',
});</code></pre>

    
    <h5>See:</h5>
    <ul class="see-list">
        <li><a href="LabelCollection.html#remove">LabelCollection#remove</a></li>
    
        <li><a href="LabelCollection.html#removeAll">LabelCollection#removeAll</a></li>
    </ul>
    

</dl>

</dd>

        
<dt>
    <div class="nameContainer">
    <h4 class="name" id="contains">
        <a href="#contains" class="doc-link"></a>
        contains<span class="signature">(label)</span> &rarr; <span class="type-signature returnType">Boolean</span>
        

<div class="source-link rightLinks">
    <a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.29/Source/Scene/LabelCollection.js#L684">Scene/LabelCollection.js 684</a>
</div>


    </h4>

    </div>

    
</dt>
<dd>

    
    <div class="description">
        Check whether this collection contains a given label.
    </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>label</code></td>
            

            <td class="type">
            
                
<span class="param-type"><a href="Label.html">Label</a></span>


            </td>

            
            <td class="description last">
            
                The label to check for.</td>
        </tr>

    
    </tbody>
</table>
    

    <h5>Returns:</h5>
    
            
<div class="param-desc">
    true if this collection contains the label, false otherwise.
</div>


<dl class="details">
    

    <h5>See:</h5>
    <ul class="see-list">
        <li><a href="LabelCollection.html#get">LabelCollection#get</a></li>
    </ul>
    

</dl>

</dd>

        
<dt>
    <div class="nameContainer">
    <h4 class="name" id="destroy">
        <a href="#destroy" class="doc-link"></a>
        destroy<span class="signature">()</span> &rarr; <span class="type-signature returnType">undefined</span>
        

<div class="source-link rightLinks">
    <a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.29/Source/Scene/LabelCollection.js#L828">Scene/LabelCollection.js 828</a>
</div>


    </h4>

    </div>

    
</dt>
<dd>

    
    <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.
<br /><br />
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.
    </div>
    

    <h5>Returns:</h5>
    
            
    <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">labels = labels &amp;&amp; labels.destroy();</code></pre>

    
    <h5>See:</h5>
    <ul class="see-list">
        <li><a href="LabelCollection.html#isDestroyed">LabelCollection#isDestroyed</a></li>
    </ul>
    

</dl>

</dd>

        
<dt>
    <div class="nameContainer">
    <h4 class="name" id="get">
        <a href="#get" class="doc-link"></a>
        get<span class="signature">(index)</span> &rarr; <span class="type-signature returnType"><a href="Label.html">Label</a></span>
        

<div class="source-link rightLinks">
    <a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.29/Source/Scene/LabelCollection.js#L716">Scene/LabelCollection.js 716</a>
</div>


    </h4>

    </div>

    
</dt>
<dd>

    
    <div class="description">
        Returns the label in the collection at the specified index.  Indices are zero-based
and increase as labels are added.  Removing a label shifts all labels after
it to the left, changing their indices.  This function is commonly used with
<a href="LabelCollection.html#length"><code>LabelCollection#length</code></a> to iterate over all the labels
in the collection.
    </div>
    

        <h5>Performance:</h5>
        <p class="description">Expected constant time.  If labels were removed from the collection and
<code>Scene#render</code> was not called, an implicit <code>O(n)</code>
operation is performed.</p>
    

<table class="params">
    <thead>
    <tr>
        
        <th>Name</th>
        

        <th>Type</th>

        
        <th class="last">Description</th>
    </tr>
    </thead>

    <tbody>
    

        <tr>
            
                <td class="name"><code>index</code></td>
            

            <td class="type">
            
                
<span class="param-type">Number</span>


            </td>

            
            <td class="description last">
            
                The zero-based index of the billboard.</td>
        </tr>

    
    </tbody>
</table>
    

    <h5>Returns:</h5>
    
            
<div class="param-desc">
    The label at the specified index.
</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">// Toggle the show property of every label in the collection
var len = labels.length;
for (var i = 0; i &lt; len; ++i) {
  var l = billboards.get(i);
  l.show = !l.show;
}</code></pre>

    
    <h5>See:</h5>
    <ul class="see-list">
        <li><a href="LabelCollection.html#length">LabelCollection#length</a></li>
    </ul>
    

</dl>

</dd>

        
<dt>
    <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/1.29/Source/Scene/LabelCollection.js#L806">Scene/LabelCollection.js 806</a>
</div>


    </h4>

    </div>

    
</dt>
<dd>

    
    <div class="description">
        Returns true if this object was destroyed; otherwise, false.
<br /><br />
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.
    </div>
    

    <h5>Returns:</h5>
    
            
<div class="param-desc">
    True if this object was destroyed; otherwise, false.
</div>


<dl class="details">
    

    <h5>See:</h5>
    <ul class="see-list">
        <li><a href="LabelCollection.html#destroy">LabelCollection#destroy</a></li>
    </ul>
    

</dl>

</dd>

        
<dt>
    <div class="nameContainer">
    <h4 class="name" id="remove">
        <a href="#remove" class="doc-link"></a>
        remove<span class="signature">(label)</span> &rarr; <span class="type-signature returnType">Boolean</span>
        

<div class="source-link rightLinks">
    <a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.29/Source/Scene/LabelCollection.js#L637">Scene/LabelCollection.js 637</a>
</div>


    </h4>

    </div>

    
</dt>
<dd>

    
    <div class="description">
        Removes a label from the collection.  Once removed, a label is no longer usable.
    </div>
    

        <h5>Performance:</h5>
        <p class="description">Calling <code>remove</code> is expected constant time.  However, the collection's vertex buffer
is rewritten - an <code>O(n)</code> operation that also incurs CPU to GPU overhead.  For
best performance, remove as many labels as possible before calling <code>update</code>.
If you intend to temporarily hide a label, it is usually more efficient to call
<a href="Label.html#show"><code>Label#show</code></a> instead of removing and re-adding the label.</p>
    

<table class="params">
    <thead>
    <tr>
        
        <th>Name</th>
        

        <th>Type</th>

        
        <th class="last">Description</th>
    </tr>
    </thead>

    <tbody>
    

        <tr>
            
                <td class="name"><code>label</code></td>
            

            <td class="type">
            
                
<span class="param-type"><a href="Label.html">Label</a></span>


            </td>

            
            <td class="description last">
            
                The label to remove.</td>
        </tr>

    
    </tbody>
</table>
    

    <h5>Returns:</h5>
    
            
<div class="param-desc">
    <code>true</code> if the label was removed; <code>false</code> if the label was not found in the collection.
</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">var l = labels.add(...);
labels.remove(l);  // Returns true</code></pre>

    
    <h5>See:</h5>
    <ul class="see-list">
        <li><a href="LabelCollection.html#add">LabelCollection#add</a></li>
    
        <li><a href="LabelCollection.html#removeAll">LabelCollection#removeAll</a></li>
    
        <li><a href="Label.html#show">Label#show</a></li>
    </ul>
    

</dl>

</dd>

        
<dt>
    <div class="nameContainer">
    <h4 class="name" id="removeAll">
        <a href="#removeAll" class="doc-link"></a>
        removeAll<span class="signature">()</span>
        

<div class="source-link rightLinks">
    <a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.29/Source/Scene/LabelCollection.js#L666">Scene/LabelCollection.js 666</a>
</div>


    </h4>

    </div>

    
</dt>
<dd>

    
    <div class="description">
        Removes all labels from the collection.
    </div>
    

        <h5>Performance:</h5>
        <p class="description"><code>O(n)</code>.  It is more efficient to remove all the labels
from a collection and then add new ones than to create a new collection entirely.</p>
    

    <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">labels.add(...);
labels.add(...);
labels.removeAll();</code></pre>

    
    <h5>See:</h5>
    <ul class="see-list">
        <li><a href="LabelCollection.html#add">LabelCollection#add</a></li>
    
        <li><a href="LabelCollection.html#remove">LabelCollection#remove</a></li>
    </ul>
    

</dl>

</dd>

        </dl>
    

</article>

</section>


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