phaser/v2/docs/Phaser.Hermite.html
2016-11-23 00:17:46 +00:00

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<div class="row-fluid">
<div class="span8">
<div id="main">
<!--<h1 class="page-title">Class: Hermite</h1>-->
<section>
<header>
<h2>
<span class="ancestors"><a href="Phaser.html">Phaser</a>.</span>
Hermite
</h2>
</header>
<article>
<div class="container-overview">
<dt>
<h4 class="name "
id="Hermite"><span class="type-signature"></span>new Hermite<span class="signature">(p1x, p1y, p2x, p2y, v1x, v1y, v2x, v2y, <span class="optional">accuracy</span>)</span><span class="type-signature"></span></h4>
</dt>
<dd>
<div class="description">
<p>A data representation of a Hermite Curve (see http://en.wikipedia.org/wiki/Cubic_Hermite_spline)</p>
<p>A Hermite curve has a start and end point and tangent vectors for both of them.<br>The curve will always pass through the two control points and the shape of it is controlled<br>by the length and direction of the tangent vectors. At the control points the curve will<br>be facing exactly in the vector direction.</p>
<p>As these curves change speed (speed = distance between points separated by an equal change in<br>'t' value - see Hermite.getPoint) this class attempts to reduce the variation by pre-calculating<br>the <code>accuracy</code> number of points on the curve. The straight-line distances to these points are stored<br>in the private 'points' array, and this information is used by Hermite.findT() to convert a pixel<br>distance along the curve into a 'time' value.</p>
<p>Higher <code>accuracy</code> values will result in more even movement, but require more memory for the points<br>list. 5 works, but 10 seems to be an ideal value for the length of curves found in most games on<br>a desktop screen. If you use very long curves (more than 400 pixels) you may need to increase<br>this value further.</p>
</div>
<h5>Parameters:</h5>
<table class="params table table-striped">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Argument</th>
<th>Default</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>p1x</code></td>
<td class="type">
<span class="param-type">number</span>
</td>
<td class="attributes">
</td>
<td class="default">
</td>
<td class="description last"><p>The x coordinate of the start of the curve.</p></td>
</tr>
<tr>
<td class="name"><code>p1y</code></td>
<td class="type">
<span class="param-type">number</span>
</td>
<td class="attributes">
</td>
<td class="default">
</td>
<td class="description last"><p>The y coordinate of the start of the curve.</p></td>
</tr>
<tr>
<td class="name"><code>p2x</code></td>
<td class="type">
<span class="param-type">number</span>
</td>
<td class="attributes">
</td>
<td class="default">
</td>
<td class="description last"><p>The x coordinate of the end of the curve.</p></td>
</tr>
<tr>
<td class="name"><code>p2y</code></td>
<td class="type">
<span class="param-type">number</span>
</td>
<td class="attributes">
</td>
<td class="default">
</td>
<td class="description last"><p>The y coordinate of the end of the curve.</p></td>
</tr>
<tr>
<td class="name"><code>v1x</code></td>
<td class="type">
<span class="param-type">number</span>
</td>
<td class="attributes">
</td>
<td class="default">
</td>
<td class="description last"><p>The x component of the tangent vector for the start of the curve.</p></td>
</tr>
<tr>
<td class="name"><code>v1y</code></td>
<td class="type">
<span class="param-type">number</span>
</td>
<td class="attributes">
</td>
<td class="default">
</td>
<td class="description last"><p>The y component of the tangent vector for the start of the curve.</p></td>
</tr>
<tr>
<td class="name"><code>v2x</code></td>
<td class="type">
<span class="param-type">number</span>
</td>
<td class="attributes">
</td>
<td class="default">
</td>
<td class="description last"><p>The x component of the tangent vector for the end of the curve.</p></td>
</tr>
<tr>
<td class="name"><code>v2y</code></td>
<td class="type">
<span class="param-type">number</span>
</td>
<td class="attributes">
</td>
<td class="default">
</td>
<td class="description last"><p>The y component of the tangent vector for the end of the curve.</p></td>
</tr>
<tr>
<td class="name"><code>accuracy</code></td>
<td class="type">
<span class="param-type">number</span>
</td>
<td class="attributes">
&lt;optional><br>
</td>
<td class="default">
10
</td>
<td class="description last"><p>The amount of points to pre-calculate on the curve.</p></td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source">Source -
<a href="src_geom_Hermite.js.html">geom/Hermite.js</a>, <a href="src_geom_Hermite.js.html#sunlight-1-line-39">line 39</a>
</dt>
</dl>
</dd>
</div>
<h3 class="subsection-title">Members</h3>
<dl>
<dt>
<h4 class="name "
id="accuracy"><span class="type-signature"></span>accuracy<span class="type-signature"> :number</span></h4>
</dt>
<dd>
<div class="description">
<p>The amount of points to pre-calculate on the curve.</p>
</div>
<dl class="details">
<dt class="tag-source">Source -
<a href="src_geom_Hermite.js.html">geom/Hermite.js</a>, <a href="src_geom_Hermite.js.html#sunlight-1-line-396">line 396</a>
</dt>
</dl>
</dd>
<dt>
<h4 class="name "
id="p1x"><span class="type-signature"></span>p1x<span class="type-signature"> :number</span></h4>
</dt>
<dd>
<div class="description">
<p>The x coordinate of the start of the curve. Setting this value will recalculate the curve.</p>
</div>
<dl class="details">
<dt class="tag-source">Source -
<a href="src_geom_Hermite.js.html">geom/Hermite.js</a>, <a href="src_geom_Hermite.js.html#sunlight-1-line-420">line 420</a>
</dt>
</dl>
</dd>
<dt>
<h4 class="name "
id="p1y"><span class="type-signature"></span>p1y<span class="type-signature"> :number</span></h4>
</dt>
<dd>
<div class="description">
<p>The y coordinate of the start of the curve. Setting this value will recalculate the curve.</p>
</div>
<dl class="details">
<dt class="tag-source">Source -
<a href="src_geom_Hermite.js.html">geom/Hermite.js</a>, <a href="src_geom_Hermite.js.html#sunlight-1-line-444">line 444</a>
</dt>
</dl>
</dd>
<dt>
<h4 class="name "
id="p2x"><span class="type-signature"></span>p2x<span class="type-signature"> :number</span></h4>
</dt>
<dd>
<div class="description">
<p>The x coordinate of the end of the curve. Setting this value will recalculate the curve.</p>
</div>
<dl class="details">
<dt class="tag-source">Source -
<a href="src_geom_Hermite.js.html">geom/Hermite.js</a>, <a href="src_geom_Hermite.js.html#sunlight-1-line-468">line 468</a>
</dt>
</dl>
</dd>
<dt>
<h4 class="name "
id="p2y"><span class="type-signature"></span>p2y<span class="type-signature"> :number</span></h4>
</dt>
<dd>
<div class="description">
<p>The y coordinate of the end of the curve. Setting this value will recalculate the curve.</p>
</div>
<dl class="details">
<dt class="tag-source">Source -
<a href="src_geom_Hermite.js.html">geom/Hermite.js</a>, <a href="src_geom_Hermite.js.html#sunlight-1-line-492">line 492</a>
</dt>
</dl>
</dd>
<dt>
<h4 class="name "
id="v1x"><span class="type-signature"></span>v1x<span class="type-signature"> :number</span></h4>
</dt>
<dd>
<div class="description">
<p>The x component of the tangent vector for the start of the curve. Setting this value will recalculate the curve.</p>
</div>
<dl class="details">
<dt class="tag-source">Source -
<a href="src_geom_Hermite.js.html">geom/Hermite.js</a>, <a href="src_geom_Hermite.js.html#sunlight-1-line-516">line 516</a>
</dt>
</dl>
</dd>
<dt>
<h4 class="name "
id="v1y"><span class="type-signature"></span>v1y<span class="type-signature"> :number</span></h4>
</dt>
<dd>
<div class="description">
<p>The y component of the tangent vector for the start of the curve. Setting this value will recalculate the curve.</p>
</div>
<dl class="details">
<dt class="tag-source">Source -
<a href="src_geom_Hermite.js.html">geom/Hermite.js</a>, <a href="src_geom_Hermite.js.html#sunlight-1-line-540">line 540</a>
</dt>
</dl>
</dd>
<dt>
<h4 class="name "
id="v2x"><span class="type-signature"></span>v2x<span class="type-signature"> :number</span></h4>
</dt>
<dd>
<div class="description">
<p>The x component of the tangent vector for the end of the curve. Setting this value will recalculate the curve.</p>
</div>
<dl class="details">
<dt class="tag-source">Source -
<a href="src_geom_Hermite.js.html">geom/Hermite.js</a>, <a href="src_geom_Hermite.js.html#sunlight-1-line-564">line 564</a>
</dt>
</dl>
</dd>
<dt>
<h4 class="name "
id="v2y"><span class="type-signature"></span>v2y<span class="type-signature"> :number</span></h4>
</dt>
<dd>
<div class="description">
<p>The y component of the tangent vector for the end of the curve. Setting this value will recalculate the curve.</p>
</div>
<dl class="details">
<dt class="tag-source">Source -
<a href="src_geom_Hermite.js.html">geom/Hermite.js</a>, <a href="src_geom_Hermite.js.html#sunlight-1-line-588">line 588</a>
</dt>
</dl>
</dd>
</dl>
<h3 class="subsection-title">Methods</h3>
<dl>
<dt>
<h4 class="name "
id="calculateEvenPoints"><span class="type-signature"></span>calculateEvenPoints<span class="signature">()</span><span class="type-signature"> &rarr; {number}</span></h4>
</dt>
<dd>
<div class="description">
<p>Calculate a number of points along the curve, based on <code>Hermite.accuracy</code>, and stores them in the private <code>_points</code> array.</p>
</div>
<h5>Returns:</h5>
<div class="returns">
<div class="returns-type">
<span class="param-type">number</span>
-
</div>
<div class="returns-desc param-desc">
<p>The total length of the curve approximated as straight line distances between the points.</p>
</div>
</div>
<dl class="details">
<dt class="tag-source">Source -
<a href="src_geom_Hermite.js.html">geom/Hermite.js</a>, <a href="src_geom_Hermite.js.html#sunlight-1-line-146">line 146</a>
</dt>
</dl>
</dd>
<dt>
<h4 class="name "
id="findT"><span class="type-signature"></span>findT<span class="signature">(distance)</span><span class="type-signature"> &rarr; {number}</span></h4>
</dt>
<dd>
<div class="description">
<p>Convert a distance along this curve into a <code>time</code> value which will be between 0 and 1.</p>
<p>For example if this curve has a length of 100 pixels then <code>findT(50)</code> would return <code>0.5</code>.</p>
</div>
<h5>Parameters:</h5>
<table class="params table table-striped">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>distance</code></td>
<td class="type">
<span class="param-type">integer</span>
</td>
<td class="description last"><p>The distance into the curve in pixels. Should be a positive integer.</p></td>
</tr>
</tbody>
</table>
<h5>Returns:</h5>
<div class="returns">
<div class="returns-type">
<span class="param-type">number</span>
-
</div>
<div class="returns-desc param-desc">
<p>The time (<code>t</code>) value, a float between 0 and 1.</p>
</div>
</div>
<dl class="details">
<dt class="tag-source">Source -
<a href="src_geom_Hermite.js.html">geom/Hermite.js</a>, <a href="src_geom_Hermite.js.html#sunlight-1-line-173">line 173</a>
</dt>
</dl>
</dd>
<dt>
<h4 class="name "
id="getAngle"><span class="type-signature"></span>getAngle<span class="signature">(<span class="optional">t</span>)</span><span class="type-signature"> &rarr; {number}</span></h4>
</dt>
<dd>
<div class="description">
<p>Calculate and return the angle, in radians, of the curves tangent based on time.</p>
</div>
<h5>Parameters:</h5>
<table class="params table table-striped">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Argument</th>
<th>Default</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>t</code></td>
<td class="type">
<span class="param-type">number</span>
</td>
<td class="attributes">
&lt;optional><br>
</td>
<td class="default">
0
</td>
<td class="description last"><p>The <code>t</code> (time) value at which to find the angle. Must be between 0 and 1.</p></td>
</tr>
</tbody>
</table>
<h5>Returns:</h5>
<div class="returns">
<div class="returns-type">
<span class="param-type">number</span>
-
</div>
<div class="returns-desc param-desc">
<p>The angle of the line at the specified <code>t</code> time value along the curve. The value is in radians.</p>
</div>
</div>
<dl class="details">
<dt class="tag-source">Source -
<a href="src_geom_Hermite.js.html">geom/Hermite.js</a>, <a href="src_geom_Hermite.js.html#sunlight-1-line-336">line 336</a>
</dt>
</dl>
</dd>
<dt>
<h4 class="name "
id="getAngleWithDistance"><span class="type-signature"></span>getAngleWithDistance<span class="signature">(<span class="optional">distance</span>)</span><span class="type-signature"> &rarr; {number}</span></h4>
</dt>
<dd>
<div class="description">
<p>Calculate and return the angle, in radians, of the curves tangent at the given pixel distance along the curves length.</p>
</div>
<h5>Parameters:</h5>
<table class="params table table-striped">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Argument</th>
<th>Default</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>distance</code></td>
<td class="type">
<span class="param-type">number</span>
</td>
<td class="attributes">
&lt;optional><br>
</td>
<td class="default">
0
</td>
<td class="description last"><p>The distance along the curve to get the angle from, in pixels.</p></td>
</tr>
</tbody>
</table>
<h5>Returns:</h5>
<div class="returns">
<div class="returns-type">
<span class="param-type">number</span>
-
</div>
<div class="returns-desc param-desc">
<p>The angle of the line at the specified distance along the curve. The value is in radians.</p>
</div>
</div>
<dl class="details">
<dt class="tag-source">Source -
<a href="src_geom_Hermite.js.html">geom/Hermite.js</a>, <a href="src_geom_Hermite.js.html#sunlight-1-line-354">line 354</a>
</dt>
</dl>
</dd>
<dt>
<h4 class="name "
id="getEntryTangent"><span class="type-signature"></span>getEntryTangent<span class="signature">(point)</span><span class="type-signature"> &rarr; {<a href="Phaser.Point.html">Phaser.Point</a>}</span></h4>
</dt>
<dd>
<div class="description">
<p>Get the angle of the curves entry point.</p>
</div>
<h5>Parameters:</h5>
<table class="params table table-striped">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>point</code></td>
<td class="type">
<span class="param-type"><a href="Phaser.Point.html">Phaser.Point</a></span>
|
<span class="param-type">Object</span>
</td>
<td class="description last"><p>The Phaser.Point object, or an Object with public <code>x</code> and <code>y</code> properties, in which the tangent vector values will be stored.</p></td>
</tr>
</tbody>
</table>
<h5>Returns:</h5>
<div class="returns">
<div class="returns-type">
<span class="param-type"><a href="Phaser.Point.html">Phaser.Point</a></span>
-
</div>
<div class="returns-desc param-desc">
<p>A Point object containing the tangent vector of this Hermite curve.</p>
</div>
</div>
<dl class="details">
<dt class="tag-source">Source -
<a href="src_geom_Hermite.js.html">geom/Hermite.js</a>, <a href="src_geom_Hermite.js.html#sunlight-1-line-376">line 376</a>
</dt>
</dl>
</dd>
<dt>
<h4 class="name "
id="getPoint"><span class="type-signature"></span>getPoint<span class="signature">(<span class="optional">t</span>, <span class="optional">point</span>)</span><span class="type-signature"> &rarr; {<a href="Phaser.Point.html">Phaser.Point</a>}</span></h4>
</dt>
<dd>
<div class="description">
<p>Get a point on the curve using the <code>t</code> (time) value, which must be between 0 and 1.</p>
</div>
<h5>Parameters:</h5>
<table class="params table table-striped">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Argument</th>
<th>Default</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>t</code></td>
<td class="type">
<span class="param-type">number</span>
</td>
<td class="attributes">
&lt;optional><br>
</td>
<td class="default">
0
</td>
<td class="description last"><p>The time value along the curve from which to extract a point. This is a value between 0 and 1, where 0 represents the start of the curve and 1 the end.</p></td>
</tr>
<tr>
<td class="name"><code>point</code></td>
<td class="type">
<span class="param-type"><a href="Phaser.Point.html">Phaser.Point</a></span>
|
<span class="param-type">Object</span>
</td>
<td class="attributes">
&lt;optional><br>
</td>
<td class="default">
</td>
<td class="description last"><p>An optional Phaser.Point, or Object containing public <code>x</code> and <code>y</code> properties. If given the resulting values will be stored in the Objects <code>x</code> and <code>y</code> properties. If omitted a new Phaser.Point object is created.</p></td>
</tr>
</tbody>
</table>
<h5>Returns:</h5>
<div class="returns">
<div class="returns-type">
<span class="param-type"><a href="Phaser.Point.html">Phaser.Point</a></span>
-
</div>
<div class="returns-desc param-desc">
<p>An Object with the x, y coordinate of the curve at the specified <code>t</code> value set in its <code>x</code> and <code>y</code> properties.</p>
</div>
</div>
<dl class="details">
<dt class="tag-source">Source -
<a href="src_geom_Hermite.js.html">geom/Hermite.js</a>, <a href="src_geom_Hermite.js.html#sunlight-1-line-276">line 276</a>
</dt>
</dl>
</dd>
<dt>
<h4 class="name "
id="getPointWithDistance"><span class="type-signature"></span>getPointWithDistance<span class="signature">(<span class="optional">distance</span>, <span class="optional">point</span>)</span><span class="type-signature"> &rarr; {<a href="Phaser.Point.html">Phaser.Point</a>}</span></h4>
</dt>
<dd>
<div class="description">
<p>Get a point on the curve using the distance, in pixels, along the curve.</p>
</div>
<h5>Parameters:</h5>
<table class="params table table-striped">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Argument</th>
<th>Default</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>distance</code></td>
<td class="type">
<span class="param-type">integer</span>
</td>
<td class="attributes">
&lt;optional><br>
</td>
<td class="default">
0
</td>
<td class="description last"><p>The distance along the curve to get the point from, given in pixels.</p></td>
</tr>
<tr>
<td class="name"><code>point</code></td>
<td class="type">
<span class="param-type"><a href="Phaser.Point.html">Phaser.Point</a></span>
|
<span class="param-type">Object</span>
</td>
<td class="attributes">
&lt;optional><br>
</td>
<td class="default">
</td>
<td class="description last"><p>An optional Phaser.Point, or Object containing public <code>x</code> and <code>y</code> properties. If given the resulting values will be stored in the Objects <code>x</code> and <code>y</code> properties. If omitted a new Phaser.Point object is created.</p></td>
</tr>
</tbody>
</table>
<h5>Returns:</h5>
<div class="returns">
<div class="returns-type">
<span class="param-type"><a href="Phaser.Point.html">Phaser.Point</a></span>
-
</div>
<div class="returns-desc param-desc">
<p>The point on the line at the specified 'distance' along the curve.</p>
</div>
</div>
<dl class="details">
<dt class="tag-source">Source -
<a href="src_geom_Hermite.js.html">geom/Hermite.js</a>, <a href="src_geom_Hermite.js.html#sunlight-1-line-309">line 309</a>
</dt>
</dl>
</dd>
<dt>
<h4 class="name "
id="getX"><span class="type-signature"></span>getX<span class="signature">(<span class="optional">t</span>)</span><span class="type-signature"> &rarr; {number}</span></h4>
</dt>
<dd>
<div class="description">
<p>Get the X component of a point on the curve based on the <code>t</code> (time) value, which must be between 0 and 1.</p>
</div>
<h5>Parameters:</h5>
<table class="params table table-striped">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Argument</th>
<th>Default</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>t</code></td>
<td class="type">
<span class="param-type">number</span>
</td>
<td class="attributes">
&lt;optional><br>
</td>
<td class="default">
0
</td>
<td class="description last"><p>The time value along the curve from which to extract a point. This is a value between 0 and 1, where 0 represents the start of the curve and 1 the end.</p></td>
</tr>
</tbody>
</table>
<h5>Returns:</h5>
<div class="returns">
<div class="returns-type">
<span class="param-type">number</span>
-
</div>
<div class="returns-desc param-desc">
<p>The X component of a point on the curve based on the <code>t</code> (time) value.</p>
</div>
</div>
<dl class="details">
<dt class="tag-source">Source -
<a href="src_geom_Hermite.js.html">geom/Hermite.js</a>, <a href="src_geom_Hermite.js.html#sunlight-1-line-210">line 210</a>
</dt>
</dl>
</dd>
<dt>
<h4 class="name "
id="getY"><span class="type-signature"></span>getY<span class="signature">(<span class="optional">t</span>)</span><span class="type-signature"> &rarr; {number}</span></h4>
</dt>
<dd>
<div class="description">
<p>Get the Y component of a point on the curve based on the <code>t</code> (time) value, which must be between 0 and 1.</p>
</div>
<h5>Parameters:</h5>
<table class="params table table-striped">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Argument</th>
<th>Default</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>t</code></td>
<td class="type">
<span class="param-type">number</span>
</td>
<td class="attributes">
&lt;optional><br>
</td>
<td class="default">
0
</td>
<td class="description last"><p>The time value along the curve from which to extract a point. This is a value between 0 and 1, where 0 represents the start of the curve and 1 the end.</p></td>
</tr>
</tbody>
</table>
<h5>Returns:</h5>
<div class="returns">
<div class="returns-type">
<span class="param-type">number</span>
-
</div>
<div class="returns-desc param-desc">
<p>The Y component of a point on the curve based on the <code>t</code> (time) value.</p>
</div>
</div>
<dl class="details">
<dt class="tag-source">Source -
<a href="src_geom_Hermite.js.html">geom/Hermite.js</a>, <a href="src_geom_Hermite.js.html#sunlight-1-line-243">line 243</a>
</dt>
</dl>
</dd>
<dt>
<h4 class="name "
id="recalculate"><span class="type-signature"></span>recalculate<span class="signature">()</span><span class="type-signature"> &rarr; {<a href="Phaser.Hermite.html">Phaser.Hermite</a>}</span></h4>
</dt>
<dd>
<div class="description">
<p>Performs the curve calculations.</p>
<p>This is called automatically if you change any of the curves public properties, such as <code>Hermite.p1x</code> or <code>Hermite.v2y</code>.</p>
<p>If you adjust any of the internal private values, then call this to update the points.</p>
</div>
<h5>Returns:</h5>
<div class="returns">
<div class="returns-type">
<span class="param-type"><a href="Phaser.Hermite.html">Phaser.Hermite</a></span>
-
</div>
<div class="returns-desc param-desc">
<p>This object.</p>
</div>
</div>
<dl class="details">
<dt class="tag-source">Source -
<a href="src_geom_Hermite.js.html">geom/Hermite.js</a>, <a href="src_geom_Hermite.js.html#sunlight-1-line-123">line 123</a>
</dt>
</dl>
</dd>
</dl>
</article>
</section>
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Phaser Copyright © 2012-2016 Photon Storm Ltd.
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