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2022-07-05 16:56:29 +08:00
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<title>TilingScheme - Cesium Documentation</title>
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<h1 class="page-title">
<a href="index.html"><img src="Images/CesiumLogo.png" class="cesiumLogo"></a>
TilingScheme
<div class="titleCenterer"></div>
</h1>
<section>
<header>
</header>
<article>
<div class="container-overview">
<div class="nameContainer">
<h4 class="name" id="TilingScheme">
<a href="#TilingScheme" class="doc-link"></a>
new Cesium.TilingScheme<span class="signature">()</span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Core/TilingScheme.js#L16">Core/TilingScheme.js 16</a>
</div>
</h4>
</div>
<div class="description">
A tiling scheme for geometry or imagery on the surface of an ellipsoid. At level-of-detail zero,
the coarsest, least-detailed level, the number of tiles is configurable.
At level of detail one, each of the level zero tiles has four children, two in each direction.
At level of detail two, each of the level one tiles has four children, two in each direction.
This continues for as many levels as are present in the geometry or imagery source.
</div>
<dl class="details">
<h5>See:</h5>
<ul class="see-list">
<li><a href="WebMercatorTilingScheme.html">WebMercatorTilingScheme</a></li>
<li><a href="GeographicTilingScheme.html">GeographicTilingScheme</a></li>
</ul>
</dl>
</div>
<h3 class="subsection-title">Members</h3>
<div class="nameContainer">
<h4 class="name" id="ellipsoid">
<a href="#ellipsoid" class="doc-link"></a>
ellipsoid<span class="type-signature"> : <a href="Ellipsoid.html">Ellipsoid</a></span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Core/TilingScheme.js#L30">Core/TilingScheme.js 30</a>
</div>
</h4>
</div>
<div class="description">
Gets the ellipsoid that is tiled by the tiling scheme.
</div>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="projection">
<a href="#projection" class="doc-link"></a>
projection<span class="type-signature"> : <a href="MapProjection.html">MapProjection</a></span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Core/TilingScheme.js#L48">Core/TilingScheme.js 48</a>
</div>
</h4>
</div>
<div class="description">
Gets the map projection used by the tiling scheme.
</div>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="rectangle">
<a href="#rectangle" class="doc-link"></a>
rectangle<span class="type-signature"> : <a href="Rectangle.html">Rectangle</a></span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Core/TilingScheme.js#L39">Core/TilingScheme.js 39</a>
</div>
</h4>
</div>
<div class="description">
Gets the rectangle, in radians, covered by this tiling scheme.
</div>
<dl class="details">
</dl>
<h3 class="subsection-title">Methods</h3>
<div class="nameContainer">
<h4 class="name" id="getNumberOfXTilesAtLevel">
<a href="#getNumberOfXTilesAtLevel" class="doc-link"></a>
getNumberOfXTilesAtLevel<span class="signature">(level)</span> &rarr; <span class="type-signature returnType">Number</span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Core/TilingScheme.js#L60">Core/TilingScheme.js 60</a>
</div>
</h4>
</div>
<div class="description">
Gets the total number of tiles in the X direction at a specified level-of-detail.
</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>level</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last">
The level-of-detail.</td>
</tr>
</tbody>
</table>
<h5>Returns:</h5>
<div class="param-desc">
The number of tiles in the X direction at the given level.
</div>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="getNumberOfYTilesAtLevel">
<a href="#getNumberOfYTilesAtLevel" class="doc-link"></a>
getNumberOfYTilesAtLevel<span class="signature">(level)</span> &rarr; <span class="type-signature returnType">Number</span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Core/TilingScheme.js#L70">Core/TilingScheme.js 70</a>
</div>
</h4>
</div>
<div class="description">
Gets the total number of tiles in the Y direction at a specified level-of-detail.
</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>level</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last">
The level-of-detail.</td>
</tr>
</tbody>
</table>
<h5>Returns:</h5>
<div class="param-desc">
The number of tiles in the Y direction at the given level.
</div>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="positionToTileXY">
<a href="#positionToTileXY" class="doc-link"></a>
positionToTileXY<span class="signature">(position, level, <span class="optional">result</span>)</span> &rarr; <span class="type-signature returnType"><a href="Cartesian2.html">Cartesian2</a></span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Core/TilingScheme.js#L130">Core/TilingScheme.js 130</a>
</div>
</h4>
</div>
<div class="description">
Calculates the tile x, y coordinates of the tile containing
a given cartographic position.
</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>position</code></td>
<td class="type">
<span class="param-type"><a href="Cartographic.html">Cartographic</a></span>
</td>
<td class="description last">
The position.</td>
</tr>
<tr>
<td class="name"><code>level</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last">
The tile level-of-detail. Zero is the least detailed.</td>
</tr>
<tr>
<td class="name"><code>result</code></td>
<td class="type">
<span class="param-type"><a href="Cartesian2.html">Cartesian2</a></span>
</td>
<td class="description last">
<span class="optional">optional</span>
The instance to which to copy the result, or undefined if a new instance
should be created.</td>
</tr>
</tbody>
</table>
<h5>Returns:</h5>
<div class="param-desc">
The specified 'result', or a new object containing the tile x, y coordinates
if 'result' is undefined.
</div>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="rectangleToNativeRectangle">
<a href="#rectangleToNativeRectangle" class="doc-link"></a>
rectangleToNativeRectangle<span class="signature">(rectangle, <span class="optional">result</span>)</span> &rarr; <span class="type-signature returnType"><a href="Rectangle.html">Rectangle</a></span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Core/TilingScheme.js#L84">Core/TilingScheme.js 84</a>
</div>
</h4>
</div>
<div class="description">
Transforms a rectangle specified in geodetic radians to the native coordinate system
of this tiling scheme.
</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>rectangle</code></td>
<td class="type">
<span class="param-type"><a href="Rectangle.html">Rectangle</a></span>
</td>
<td class="description last">
The rectangle to transform.</td>
</tr>
<tr>
<td class="name"><code>result</code></td>
<td class="type">
<span class="param-type"><a href="Rectangle.html">Rectangle</a></span>
</td>
<td class="description last">
<span class="optional">optional</span>
The instance to which to copy the result, or undefined if a new instance
should be created.</td>
</tr>
</tbody>
</table>
<h5>Returns:</h5>
<div class="param-desc">
The specified 'result', or a new object containing the native rectangle if 'result'
is undefined.
</div>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="tileXYToNativeRectangle">
<a href="#tileXYToNativeRectangle" class="doc-link"></a>
tileXYToNativeRectangle<span class="signature">(x, y, level, <span class="optional">result</span>)</span> &rarr; <span class="type-signature returnType"><a href="Rectangle.html">Rectangle</a></span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Core/TilingScheme.js#L100">Core/TilingScheme.js 100</a>
</div>
</h4>
</div>
<div class="description">
Converts tile x, y coordinates and level to a rectangle expressed in the native coordinates
of the tiling scheme.
</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>x</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last">
The integer x coordinate of the tile.</td>
</tr>
<tr>
<td class="name"><code>y</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last">
The integer y coordinate of the tile.</td>
</tr>
<tr>
<td class="name"><code>level</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last">
The tile level-of-detail. Zero is the least detailed.</td>
</tr>
<tr>
<td class="name"><code>result</code></td>
<td class="type">
<span class="param-type">Object</span>
</td>
<td class="description last">
<span class="optional">optional</span>
The instance to which to copy the result, or undefined if a new instance
should be created.</td>
</tr>
</tbody>
</table>
<h5>Returns:</h5>
<div class="param-desc">
The specified 'result', or a new object containing the rectangle
if 'result' is undefined.
</div>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="tileXYToRectangle">
<a href="#tileXYToRectangle" class="doc-link"></a>
tileXYToRectangle<span class="signature">(x, y, level, <span class="optional">result</span>)</span> &rarr; <span class="type-signature returnType"><a href="Rectangle.html">Rectangle</a></span>
<div class="source-link rightLinks">
<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Core/TilingScheme.js#L115">Core/TilingScheme.js 115</a>
</div>
</h4>
</div>
<div class="description">
Converts tile x, y coordinates and level to a cartographic rectangle in radians.
</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>x</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last">
The integer x coordinate of the tile.</td>
</tr>
<tr>
<td class="name"><code>y</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last">
The integer y coordinate of the tile.</td>
</tr>
<tr>
<td class="name"><code>level</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last">
The tile level-of-detail. Zero is the least detailed.</td>
</tr>
<tr>
<td class="name"><code>result</code></td>
<td class="type">
<span class="param-type">Object</span>
</td>
<td class="description last">
<span class="optional">optional</span>
The instance to which to copy the result, or undefined if a new instance
should be created.</td>
</tr>
</tbody>
</table>
<h5>Returns:</h5>
<div class="param-desc">
The specified 'result', or a new object containing the rectangle
if 'result' is undefined.
</div>
<dl class="details">
</dl>
</article>
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