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小熊猫 提交于 2019-06-28 17:59 . no commit message
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>GridImageryProvider - Cesium Documentation</title>
<!--[if lt IE 9]>
<script src="javascript/html5.js"></script>
<![endif]-->
<link href="styles/jsdoc-default.css" rel="stylesheet">
<link href="styles/prism.css" rel="stylesheet">
<script>
function switch_menus(display) {
var ele = document.getElementById("toggleToc");
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ele.style.display = "block";
ele2.style.display = "none";
ele_nav.style.display = 'block';
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</script>
</head>
<body>
<div style="position: fixed;z-index: 999;top: 93vh;padding-right: 6px;right: 0px;">
<div id="toggleToc">
<img onclick="switch_menus('hide')" src="./icons/hide.png" alt="全屏">
</div>
<div id="toggleToc2" style="margin-bottom: 15px;display: none;">
<img onclick="switch_menus('show')" src="./icons/show.png" alt="取消全屏">
</div>
</div>
<div id="main">
<h1 class="page-title">
<a href="index.html"><img src="Images/CesiumLogo.png" class="cesiumLogo"></a>
GridImageryProvider
<div class="titleCenterer"></div>
</h1>
<section>
<header>
</header>
<article>
<div class="container-overview">
<div class="nameContainer">
<h4 class="name" id="GridImageryProvider">
<a href="#GridImageryProvider" class="doc-link"></a>
new Cesium.GridImageryProvider<span class="signature">(<span class="optional">options</span>)</span>
<div class="source-link rightLinks">
<a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.56.1/Source/Scene/GridImageryProvider.js#L44">Scene/GridImageryProvider.js 44</a>
</div>
</h4>
</div>
<div class="description">
An <a href="ImageryProvider.html"><code>ImageryProvider</code></a> that draws a wireframe grid on every tile with controllable background and glow.
May be useful for custom rendering effects or debugging terrain.
</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>tilingScheme</code></td>
<td class="type">
<span class="param-type"><a href="TilingScheme.html">TilingScheme</a></span>
</td>
<td class="default">
<code class="language-javascript">new GeographicTilingScheme()</code>
</td>
<td class="description last">
<span class="optional">optional</span>
The tiling scheme for which to draw tiles.</td>
</tr>
<tr>
<td class="name"><code>ellipsoid</code></td>
<td class="type">
<span class="param-type"><a href="Ellipsoid.html">Ellipsoid</a></span>
</td>
<td class="default">
</td>
<td class="description last">
<span class="optional">optional</span>
The ellipsoid. If the tilingScheme is specified,
this parameter is ignored and the tiling scheme's ellipsoid is used instead. If neither
parameter is specified, the WGS84 ellipsoid is used.</td>
</tr>
<tr>
<td class="name"><code>cells</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="default">
<code class="language-javascript">8</code>
</td>
<td class="description last">
<span class="optional">optional</span>
The number of grids cells.</td>
</tr>
<tr>
<td class="name"><code>color</code></td>
<td class="type">
<span class="param-type"><a href="Color.html">Color</a></span>
</td>
<td class="default">
<code class="language-javascript">Color(1.0, 1.0, 1.0, 0.4)</code>
</td>
<td class="description last">
<span class="optional">optional</span>
The color to draw grid lines.</td>
</tr>
<tr>
<td class="name"><code>glowColor</code></td>
<td class="type">
<span class="param-type"><a href="Color.html">Color</a></span>
</td>
<td class="default">
<code class="language-javascript">Color(0.0, 1.0, 0.0, 0.05)</code>
</td>
<td class="description last">
<span class="optional">optional</span>
The color to draw glow for grid lines.</td>
</tr>
<tr>
<td class="name"><code>glowWidth</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="default">
<code class="language-javascript">6</code>
</td>
<td class="description last">
<span class="optional">optional</span>
The width of lines used for rendering the line glow effect.</td>
</tr>
<tr>
<td class="name"><code>backgroundColor</code></td>
<td class="type">
<span class="param-type"><a href="Color.html">Color</a></span>
</td>
<td class="default">
<code class="language-javascript">Color(0.0, 0.5, 0.0, 0.2)</code>
</td>
<td class="description last">
<span class="optional">optional</span>
Background fill color.</td>
</tr>
<tr>
<td class="name"><code>tileWidth</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="default">
<code class="language-javascript">256</code>
</td>
<td class="description last">
<span class="optional">optional</span>
The width of the tile for level-of-detail selection purposes.</td>
</tr>
<tr>
<td class="name"><code>tileHeight</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="default">
<code class="language-javascript">256</code>
</td>
<td class="description last">
<span class="optional">optional</span>
The height of the tile for level-of-detail selection purposes.</td>
</tr>
<tr>
<td class="name"><code>canvasSize</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="default">
<code class="language-javascript">256</code>
</td>
<td class="description last">
<span class="optional">optional</span>
The size of the canvas used for rendering.</td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
<dl class="details">
</dl>
</div>
<h3 class="subsection-title">Members</h3>
<div class="nameContainer">
<h4 class="name" id="credit">
<a href="#credit" class="doc-link"></a>
<span class="type-signature attribute-readonly">readonly</span>credit<span class="type-signature"> : <a href="Credit.html">Credit</a></span>
<div class="source-link rightLinks">
<a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.56.1/Source/Scene/GridImageryProvider.js#L219">Scene/GridImageryProvider.js 219</a>
</div>
</h4>
</div>
<div class="description">
Gets the credit to display when this imagery provider is active. Typically this is used to credit
the source of the imagery. This function should not be called before <a href="GridImageryProvider.html#ready"><code>GridImageryProvider#ready</code></a> returns true.
</div>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="errorEvent">
<a href="#errorEvent" class="doc-link"></a>
<span class="type-signature attribute-readonly">readonly</span>errorEvent<span class="type-signature"> : <a href="Event.html">Event</a></span>
<div class="source-link rightLinks">
<a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.56.1/Source/Scene/GridImageryProvider.js#L182">Scene/GridImageryProvider.js 182</a>
</div>
</h4>
</div>
<div class="description">
Gets an event that is raised when the imagery provider encounters an asynchronous error. By subscribing
to the event, you will be notified of the error and can potentially recover from it. Event listeners
are passed an instance of <a href="TileProviderError.html"><code>TileProviderError</code></a>.
</div>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="hasAlphaChannel">
<a href="#hasAlphaChannel" class="doc-link"></a>
<span class="type-signature attribute-readonly">readonly</span>hasAlphaChannel<span class="type-signature"> : Boolean</span>
<div class="source-link rightLinks">
<a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.56.1/Source/Scene/GridImageryProvider.js#L235">Scene/GridImageryProvider.js 235</a>
</div>
</h4>
</div>
<div class="description">
Gets a value indicating whether or not the images provided by this imagery provider
include an alpha channel. If this property is false, an alpha channel, if present, will
be ignored. If this property is true, any images without an alpha channel will be treated
as if their alpha is 1.0 everywhere. When this property is false, memory usage
and texture upload time are reduced.
</div>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="maximumLevel">
<a href="#maximumLevel" class="doc-link"></a>
<span class="type-signature attribute-readonly">readonly</span>maximumLevel<span class="type-signature"> : Number</span>
<div class="source-link rightLinks">
<a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.56.1/Source/Scene/GridImageryProvider.js#L114">Scene/GridImageryProvider.js 114</a>
</div>
</h4>
</div>
<div class="description">
Gets the maximum level-of-detail that can be requested. This function should
not be called before <a href="GridImageryProvider.html#ready"><code>GridImageryProvider#ready</code></a> returns true.
</div>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="minimumLevel">
<a href="#minimumLevel" class="doc-link"></a>
<span class="type-signature attribute-readonly">readonly</span>minimumLevel<span class="type-signature"> : Number</span>
<div class="source-link rightLinks">
<a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.56.1/Source/Scene/GridImageryProvider.js#L127">Scene/GridImageryProvider.js 127</a>
</div>
</h4>
</div>
<div class="description">
Gets the minimum level-of-detail that can be requested. This function should
not be called before <a href="GridImageryProvider.html#ready"><code>GridImageryProvider#ready</code></a> returns true.
</div>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="proxy">
<a href="#proxy" class="doc-link"></a>
<span class="type-signature attribute-readonly">readonly</span>proxy<span class="type-signature"> : Proxy</span>
<div class="source-link rightLinks">
<a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.56.1/Source/Scene/GridImageryProvider.js#L75">Scene/GridImageryProvider.js 75</a>
</div>
</h4>
</div>
<div class="description">
Gets the proxy used by this provider.
</div>
<dl class="details">
</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/1.56.1/Source/Scene/GridImageryProvider.js#L194">Scene/GridImageryProvider.js 194</a>
</div>
</h4>
</div>
<div class="description">
Gets a value indicating whether or not the provider is ready for use.
</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;Boolean></span>
<div class="source-link rightLinks">
<a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.56.1/Source/Scene/GridImageryProvider.js#L206">Scene/GridImageryProvider.js 206</a>
</div>
</h4>
</div>
<div class="description">
Gets a promise that resolves to true when the provider is ready for use.
</div>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="rectangle">
<a href="#rectangle" class="doc-link"></a>
<span class="type-signature attribute-readonly">readonly</span>rectangle<span class="type-signature"> : <a href="Rectangle.html">Rectangle</a></span>
<div class="source-link rightLinks">
<a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.56.1/Source/Scene/GridImageryProvider.js#L153">Scene/GridImageryProvider.js 153</a>
</div>
</h4>
</div>
<div class="description">
Gets the rectangle, in radians, of the imagery provided by this instance. This function should
not be called before <a href="GridImageryProvider.html#ready"><code>GridImageryProvider#ready</code></a> returns true.
</div>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="tileDiscardPolicy">
<a href="#tileDiscardPolicy" class="doc-link"></a>
<span class="type-signature attribute-readonly">readonly</span>tileDiscardPolicy<span class="type-signature"> : <a href="TileDiscardPolicy.html">TileDiscardPolicy</a></span>
<div class="source-link rightLinks">
<a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.56.1/Source/Scene/GridImageryProvider.js#L168">Scene/GridImageryProvider.js 168</a>
</div>
</h4>
</div>
<div class="description">
Gets the tile discard policy. If not undefined, the discard policy is responsible
for filtering out "missing" tiles via its shouldDiscardImage function. If this function
returns undefined, no tiles are filtered. This function should
not be called before <a href="GridImageryProvider.html#ready"><code>GridImageryProvider#ready</code></a> returns true.
</div>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="tileHeight">
<a href="#tileHeight" class="doc-link"></a>
<span class="type-signature attribute-readonly">readonly</span>tileHeight<span class="type-signature"> : Number</span>
<div class="source-link rightLinks">
<a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.56.1/Source/Scene/GridImageryProvider.js#L101">Scene/GridImageryProvider.js 101</a>
</div>
</h4>
</div>
<div class="description">
Gets the height of each tile, in pixels. This function should
not be called before <a href="GridImageryProvider.html#ready"><code>GridImageryProvider#ready</code></a> returns true.
</div>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="tileWidth">
<a href="#tileWidth" class="doc-link"></a>
<span class="type-signature attribute-readonly">readonly</span>tileWidth<span class="type-signature"> : Number</span>
<div class="source-link rightLinks">
<a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.56.1/Source/Scene/GridImageryProvider.js#L88">Scene/GridImageryProvider.js 88</a>
</div>
</h4>
</div>
<div class="description">
Gets the width of each tile, in pixels. This function should
not be called before <a href="GridImageryProvider.html#ready"><code>GridImageryProvider#ready</code></a> returns true.
</div>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="tilingScheme">
<a href="#tilingScheme" class="doc-link"></a>
<span class="type-signature attribute-readonly">readonly</span>tilingScheme<span class="type-signature"> : <a href="TilingScheme.html">TilingScheme</a></span>
<div class="source-link rightLinks">
<a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.56.1/Source/Scene/GridImageryProvider.js#L140">Scene/GridImageryProvider.js 140</a>
</div>
</h4>
</div>
<div class="description">
Gets the tiling scheme used by this provider. This function should
not be called before <a href="GridImageryProvider.html#ready"><code>GridImageryProvider#ready</code></a> returns true.
</div>
<dl class="details">
</dl>
<h3 class="subsection-title">Methods</h3>
<div class="nameContainer">
<h4 class="name" id="_createGridCanvas">
<a href="#_createGridCanvas" class="doc-link"></a>
_createGridCanvas<span class="signature">()</span>
<div class="source-link rightLinks">
<a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.56.1/Source/Scene/GridImageryProvider.js#L263">Scene/GridImageryProvider.js 263</a>
</div>
</h4>
</div>
<div class="description">
Render a grid into a canvas with background and glow
</div>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="_drawGrid">
<a href="#_drawGrid" class="doc-link"></a>
_drawGrid<span class="signature">()</span>
<div class="source-link rightLinks">
<a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.56.1/Source/Scene/GridImageryProvider.js#L245">Scene/GridImageryProvider.js 245</a>
</div>
</h4>
</div>
<div class="description">
Draws a grid of lines into a canvas.
</div>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="getTileCredits">
<a href="#getTileCredits" class="doc-link"></a>
getTileCredits<span class="signature">(x, y, level)</span> &rarr; <span class="type-signature returnType">Array.&lt;<a href="Credit.html">Credit</a>></span>
<div class="source-link rightLinks">
<a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.56.1/Source/Scene/GridImageryProvider.js#L312">Scene/GridImageryProvider.js 312</a>
</div>
</h4>
</div>
<div class="description">
Gets the credits to be displayed when a given tile is displayed.
</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 tile X coordinate.</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 tile Y coordinate.</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;</td>
</tr>
</tbody>
</table>
<h5>Returns:</h5>
<div class="param-desc">
The credits to be displayed when the tile is displayed.
</div>
<h5>Throws:</h5>
<ul>
<li>
<div class="param-desc">
<span class="param-type"><a href="DeveloperError.html">DeveloperError</a></span>
: <code>getTileCredits</code> must not be called before the imagery provider is ready.
</div>
</li>
</ul>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="pickFeatures">
<a href="#pickFeatures" class="doc-link"></a>
pickFeatures<span class="signature">(x, y, level, longitude, latitude)</span> &rarr; <span class="type-signature returnType">Promise.&lt;Array.&lt;<a href="ImageryLayerFeatureInfo.html">ImageryLayerFeatureInfo</a>>>|undefined</span>
<div class="source-link rightLinks">
<a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.56.1/Source/Scene/GridImageryProvider.js#L347">Scene/GridImageryProvider.js 347</a>
</div>
</h4>
</div>
<div class="description">
Picking features is not currently supported by this imagery provider, so this function simply returns
undefined.
</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 tile X coordinate.</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 tile Y coordinate.</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.</td>
</tr>
<tr>
<td class="name"><code>longitude</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last">
The longitude at which to pick features.</td>
</tr>
<tr>
<td class="name"><code>latitude</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last">
The latitude at which to pick features.</td>
</tr>
</tbody>
</table>
<h5>Returns:</h5>
<div class="param-desc">
A promise for the picked features that will resolve when the asynchronous
picking completes. The resolved value is an array of <a href="ImageryLayerFeatureInfo.html"><code>ImageryLayerFeatureInfo</code></a>
instances. The array may be empty if no features are found at the given location.
It may also be undefined if picking is not supported.
</div>
<dl class="details">
</dl>
<div class="nameContainer">
<h4 class="name" id="requestImage">
<a href="#requestImage" class="doc-link"></a>
requestImage<span class="signature">(x, y, level, <span class="optional">request</span>)</span> &rarr; <span class="type-signature returnType">Promise.&lt;(Image|Canvas)>|undefined</span>
<div class="source-link rightLinks">
<a href="https://github.com/AnalyticalGraphicsInc/cesium/blob/1.56.1/Source/Scene/GridImageryProvider.js#L329">Scene/GridImageryProvider.js 329</a>
</div>
</h4>
</div>
<div class="description">
Requests the image for a given tile. This function should
not be called before <a href="GridImageryProvider.html#ready"><code>GridImageryProvider#ready</code></a> returns true.
</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 tile X coordinate.</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 tile Y coordinate.</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.</td>
</tr>
<tr>
<td class="name"><code>request</code></td>
<td class="type">
<span class="param-type"><a href="Request.html">Request</a></span>
</td>
<td class="description last">
<span class="optional">optional</span>
The request object. Intended for internal use only.</td>
</tr>
</tbody>
</table>
<h5>Returns:</h5>
<div class="param-desc">
A promise for the image that will resolve when the image is available, or
undefined if there are too many active requests to the server, and the request
should be retried later. The resolved image may be either an
Image or a Canvas DOM object.
</div>
<dl class="details">
</dl>
</article>
</section>
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