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							<!DOCTYPE html>
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    <title>PolylineCollection - 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>
        PolylineCollection
        <div class="titleCenterer"></div>
    </h1>

    
<section>

<header>
    
</header>

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

<dt>
    <div class="nameContainer">
    <h4 class="name" id="PolylineCollection">
        <a href="#PolylineCollection" class="doc-link"></a>
        new Cesium.PolylineCollection<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/PolylineCollection.js#L154">Scene/PolylineCollection.js 154</a>
</div>


    </h4>

    </div>

    
</dt>
<dd>

    
    <div class="description">
        A renderable collection of polylines.
<br /><br />
<div align="center">
<img src="images/Polyline.png" width="400" height="300" /><br />
Example polylines
</div>
<br /><br />
Polylines are added and removed from the collection using <a href="PolylineCollection.html#add"><code>PolylineCollection#add</code></a>
and <a href="PolylineCollection.html#remove"><code>PolylineCollection#remove</code></a>.
    </div>
    

        <h5>Performance:</h5>
        <p class="description">For best performance, prefer a few collections, each with many polylines, to
many collections with only a few polylines each.  Organize collections so that polylines
with the same update frequency are in the same collection, i.e., polylines that do not
change should be in one collection; polylines that change every frame should be in another
collection; and so on.</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 polyline 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>

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

    
    </tbody>
</table>
    

<dl class="details">
    

        <h5>Example:</h5>
        
    <pre><code class="language-javascript">// Create a polyline collection with two polylines
var polylines = new Cesium.PolylineCollection();
polylines.add({
  positions : Cesium.Cartesian3.fromDegreesArray([
    -75.10, 39.57,
    -77.02, 38.53,
    -80.50, 35.14,
    -80.12, 25.46]),
  width : 2
});

polylines.add({
  positions : Cesium.Cartesian3.fromDegreesArray([
    -73.10, 37.57,
    -75.02, 36.53,
    -78.50, 33.14,
    -78.12, 23.46]),
  width : 4
});</code></pre>

    
    <h5>See:</h5>
    <ul class="see-list">
        <li><a href="PolylineCollection.html#add">PolylineCollection#add</a></li>
    
        <li><a href="PolylineCollection.html#remove">PolylineCollection#remove</a></li>
    
        <li><a href="Polyline.html">Polyline</a></li>
    
        <li><a href="LabelCollection.html">LabelCollection</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/PolylineCollection.js#L179">Scene/PolylineCollection.js 179</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/PolylineCollection.js#L216">Scene/PolylineCollection.js 216</a>
</div>


    </h4>

    </div>

    
</dt>
<dd>
    
    <div class="description">
        Returns the number of polylines in this collection.  This is commonly used with
<a href="PolylineCollection.html#get"><code>PolylineCollection#get</code></a> to iterate over all the polylines
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/PolylineCollection.js#L166">Scene/PolylineCollection.js 166</a>
</div>


    </h4>

    </div>

    
</dt>
<dd>
    
    <div class="description">
        The 4x4 transformation matrix that transforms each polyline in this collection from model to world coordinates.
When this is the identity matrix, the polylines 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>
    

</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">polyline</span>)</span> &rarr; <span class="type-signature returnType"><a href="Polyline.html">Polyline</a></span>
        

<div class="source-link rightLinks">
    <a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.29/Source/Scene/PolylineCollection.js#L252">Scene/PolylineCollection.js 252</a>
</div>


    </h4>

    </div>

    
</dt>
<dd>

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

        <h5>Performance:</h5>
        <p class="description">After calling <code>add</code>, <a href="PolylineCollection.html#update"><code>PolylineCollection#update</code></a> is called and
the collection's vertex buffer is rewritten - an <code>O(n)</code> operation that also incurs CPU to GPU overhead.
For best performance, add as many polylines 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>polyline</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 polyline's properties as shown in Example 1.</td>
        </tr>

    
    </tbody>
</table>
    

    <h5>Returns:</h5>
    
            
<div class="param-desc">
    The polyline 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>Example:</h5>
        
    <pre><code class="language-javascript">// Example 1:  Add a polyline, specifying all the default values.
var p = polylines.add({
  show : true,
  positions : ellipsoid.cartographicArrayToCartesianArray([
           Cesium.Cartographic.fromDegrees(-75.10, 39.57),
           Cesium.Cartographic.fromDegrees(-77.02, 38.53)]),
  width : 1
});</code></pre>

    
    <h5>See:</h5>
    <ul class="see-list">
        <li><a href="PolylineCollection.html#remove">PolylineCollection#remove</a></li>
    
        <li><a href="PolylineCollection.html#removeAll">PolylineCollection#removeAll</a></li>
    
        <li><a href="PolylineCollection.html#update">PolylineCollection#update</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">(polyline)</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/PolylineCollection.js#L339">Scene/PolylineCollection.js 339</a>
</div>


    </h4>

    </div>

    
</dt>
<dd>

    
    <div class="description">
        Determines if this collection contains the specified polyline.
    </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>polyline</code></td>
            

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


            </td>

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

    
    </tbody>
</table>
    

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


<dl class="details">
    

    <h5>See:</h5>
    <ul class="see-list">
        <li><a href="PolylineCollection.html#get">PolylineCollection#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/PolylineCollection.js#L741">Scene/PolylineCollection.js 741</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">polylines = polylines &amp;&amp; polylines.destroy();</code></pre>

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

<div class="source-link rightLinks">
    <a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.29/Source/Scene/PolylineCollection.js#L369">Scene/PolylineCollection.js 369</a>
</div>


    </h4>

    </div>

    
</dt>
<dd>

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

        <h5>Performance:</h5>
        <p class="description">If polylines were removed from the collection and
<a href="PolylineCollection.html#update"><code>PolylineCollection#update</code></a> 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 polyline.</td>
        </tr>

    
    </tbody>
</table>
    

    <h5>Returns:</h5>
    
            
<div class="param-desc">
    The polyline 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 polyline in the collection
var len = polylines.length;
for (var i = 0; i &lt; len; ++i) {
  var p = polylines.get(i);
  p.show = !p.show;
}</code></pre>

    
    <h5>See:</h5>
    <ul class="see-list">
        <li><a href="PolylineCollection.html#length">PolylineCollection#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/PolylineCollection.js#L719">Scene/PolylineCollection.js 719</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">
    <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="PolylineCollection.html#destroy">PolylineCollection#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">(polyline)</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/PolylineCollection.js#L285">Scene/PolylineCollection.js 285</a>
</div>


    </h4>

    </div>

    
</dt>
<dd>

    
    <div class="description">
        Removes a polyline from the collection.
    </div>
    

        <h5>Performance:</h5>
        <p class="description">After calling <code>remove</code>, <a href="PolylineCollection.html#update"><code>PolylineCollection#update</code></a> is called and
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 polylines as possible before calling <code>update</code>.
If you intend to temporarily hide a polyline, it is usually more efficient to call
<a href="Polyline.html#show"><code>Polyline#show</code></a> instead of removing and re-adding the polyline.</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>polyline</code></td>
            

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


            </td>

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

    
    </tbody>
</table>
    

    <h5>Returns:</h5>
    
            
<div class="param-desc">
    <code>true</code> if the polyline was removed; <code>false</code> if the polyline 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 p = polylines.add(...);
polylines.remove(p);  // Returns true</code></pre>

    
    <h5>See:</h5>
    <ul class="see-list">
        <li><a href="PolylineCollection.html#add">PolylineCollection#add</a></li>
    
        <li><a href="PolylineCollection.html#removeAll">PolylineCollection#removeAll</a></li>
    
        <li><a href="PolylineCollection.html#update">PolylineCollection#update</a></li>
    
        <li><a href="Polyline.html#show">Polyline#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/PolylineCollection.js#L321">Scene/PolylineCollection.js 321</a>
</div>


    </h4>

    </div>

    
</dt>
<dd>

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

        <h5>Performance:</h5>
        <p class="description"><code>O(n)</code>.  It is more efficient to remove all the polylines
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">polylines.add(...);
polylines.add(...);
polylines.removeAll();</code></pre>

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

</dl>

</dd>

        
<dt>
    <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/1.29/Source/Scene/PolylineCollection.js#L425">Scene/PolylineCollection.js 425</a>
</div>


    </h4>

    </div>

    
</dt>
<dd>

    
    <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="RuntimeError.html">RuntimeError</a></span>

: Vertex texture fetch support is required to render primitives with per-instance attributes. The maximum number of vertex texture image units must be greater than zero.
    </div>

</li>
        </ul>
    

<dl class="details">
    

</dl>

</dd>

        </dl>
    

</article>

</section>


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