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Canvas.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>OpenLIMEs Class: Canvas</title>
<!--[if lt IE 9]>
<script src="//html5shiv.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
<link type="text/css" rel="stylesheet" href="styles/sunlight.default.css">
<link type="text/css" rel="stylesheet" href="styles/site.cosmo.css">
<link type="text/css" rel="stylesheet" href="styles/openlime.css">
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<li><a href="Camera.html#event:update">Camera#event:update</a></li><li><a href="Canvas.html#event:ready">Canvas#event:ready</a></li><li><a href="Canvas.html#event:update">Canvas#event:update</a></li><li><a href="Canvas.html#event:updateSize">Canvas#event:updateSize</a></li><li><a href="Layer.html#event:ready">Layer#event:ready</a></li><li><a href="Layer.html#event:update">Layer#event:update</a></li><li><a href="LayerAnnotation.html#event:ready">LayerAnnotation#event:ready</a></li><li><a href="LayerAnnotation.html#event:update">LayerAnnotation#event:update</a></li><li><a href="LayerAnnotationImage.html#event:ready">LayerAnnotationImage#event:ready</a></li><li><a href="LayerAnnotationImage.html#event:update">LayerAnnotationImage#event:update</a></li><li><a href="LayerBRDF.html#event:ready">LayerBRDF#event:ready</a></li><li><a href="LayerBRDF.html#event:update">LayerBRDF#event:update</a></li><li><a href="LayerCombiner.html#event:ready">LayerCombiner#event:ready</a></li><li><a href="LayerCombiner.html#event:update">LayerCombiner#event:update</a></li><li><a href="LayerDstretch.html#event:ready">LayerDstretch#event:ready</a></li><li><a href="LayerDstretch.html#event:update">LayerDstretch#event:update</a></li><li><a href="LayerImage.html#event:ready">LayerImage#event:ready</a></li><li><a href="LayerImage.html#event:update">LayerImage#event:update</a></li><li><a href="LayerLens.html#event:ready">LayerLens#event:ready</a></li><li><a href="LayerLens.html#event:update">LayerLens#event:update</a></li><li><a href="LayerMaskedImage.html#event:ready">LayerMaskedImage#event:ready</a></li><li><a href="LayerMaskedImage.html#event:update">LayerMaskedImage#event:update</a></li><li><a href="LayerNeuralRTI.html#event:ready">LayerNeuralRTI#event:ready</a></li><li><a href="LayerNeuralRTI.html#event:update">LayerNeuralRTI#event:update</a></li><li><a href="LayerRTI.html#event:ready">LayerRTI#event:ready</a></li><li><a href="LayerRTI.html#event:update">LayerRTI#event:update</a></li><li><a href="LayerSvgAnnotation.html#event:ready">LayerSvgAnnotation#event:ready</a></li><li><a href="LayerSvgAnnotation.html#event:update">LayerSvgAnnotation#event:update</a></li><li><a href="Layout.html#event:ready">Layout#event:ready</a></li><li><a href="Layout.html#event:updateSize">Layout#event:updateSize</a></li><li><a href="global.html#event:Layout#readyFiredwhenthelayoutisreadyforrendering.Thisoccurswhen:-Single-resolutionimageisfullydownloaded-Multi-resolutionstructureisinitializedandvalidated-Tilepyramidinformationiscomputed">Layout#ready
Fired when the layout is ready for rendering.
This occurs when:
- Single-resolution image is fully downloaded
- Multi-resolution structure is initialized and validated
- Tile pyramid information is computedevent:</a></li><li><a href="global.html#event:Layout#readyFiredwhenthelayoutisreadyforrendering.Thisoccurswhen:-Tiledescriptorsareloadedfromannotationfile-Tiledescriptorsaresetprogrammatically">Layout#ready
Fired when the layout is ready for rendering.
This occurs when:
- Tile descriptors are loaded from annotation file
- Tile descriptors are set programmaticallyevent:</a></li><li><a href="global.html#event:Layout#updateSizeFiredwhenthelayoutsizechangesandsceneextensionneedsupdating.Thisoccurswhen:-Imagedimensionsaredetermined-Pyramidlevelsareinitialized-Boundingboxesarecomputed">Layout#updateSize
Fired when the layout size changes and scene extension needs updating.
This occurs when:
- Image dimensions are determined
- Pyramid levels are initialized
- Bounding boxes are computedevent:</a></li><li><a href="global.html#event:Layout#updateSizeFiredwhenthelayoutsizechangesandsceneextensionneedsupdating.Thisoccurswhen:-Tiledescriptorsareloadedandboundingboxiscomputed">Layout#updateSize
Fired when the layout size changes and scene extension needs updating.
This occurs when:
- Tile descriptors are loaded and bounding box is computedevent:</a></li><li><a href="LayoutTileImages.html#event:ready">LayoutTileImages#event:ready</a></li><li><a href="LayoutTileImages.html#event:updateSize">LayoutTileImages#event:updateSize</a></li><li><a href="LayoutTiles.html#event:ready">LayoutTiles#event:ready</a></li><li><a href="LayoutTiles.html#event:updateSize">LayoutTiles#event:updateSize</a></li><li><a href="UIDialog.html#event:closed">UIDialog#event:closed</a></li>
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<div class="container" id="toc-content">
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<div class="col-md-8">
<div id="main">
<h1 class="page-title">Class: Canvas</h1>
<section>
<header>
<h2>
Canvas
</h2>
<div class="class-description"><p>Canvas class that manages WebGL context, layers, and scene rendering.
Handles layer management, WebGL context creation/restoration, and render timing.</p></div>
</header>
<article>
<div class="container-overview">
<hr>
<dt>
<h4 class="name" id="Canvas"><span class="type-signature"></span>new Canvas(canvas, overlay, camera [, options])</h4>
</dt>
<dd>
<div class="description">
<p>Creates a new Canvas instance with WebGL context and overlay support.</p>
</div>
<h5>Parameters:</h5>
<table class="params table table-striped">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Argument</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>canvas</code></td>
<td class="type">
<span class="param-type">HTMLCanvasElement</span>
|
<span class="param-type">string</span>
</td>
<td class="attributes">
</td>
<td class="description last"><p>Canvas DOM element or selector</p></td>
</tr>
<tr>
<td class="name"><code>overlay</code></td>
<td class="type">
<span class="param-type">HTMLElement</span>
|
<span class="param-type">string</span>
</td>
<td class="attributes">
</td>
<td class="description last"><p>Overlay DOM element or selector for decorations (annotations, glyphs)</p></td>
</tr>
<tr>
<td class="name"><code>camera</code></td>
<td class="type">
<span class="param-type"><a href="Camera.html">Camera</a></span>
</td>
<td class="attributes">
</td>
<td class="description last"><p>Scene camera instance</p></td>
</tr>
<tr>
<td class="name"><code>options</code></td>
<td class="type">
<span class="param-type">Object</span>
</td>
<td class="attributes">
<optional><br>
</td>
<td class="description last"><p>Configuration options</p>
<h6 class="method-params-label method-subparams-label">Properties</h6>
<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>layers</code></td>
<td class="type">
<span class="param-type">Object</span>
</td>
<td class="attributes">
<optional><br>
</td>
<td class="default">
</td>
<td class="description last"><p>Layer configurations mapping layer IDs to Layer instances</p></td>
</tr>
<tr>
<td class="name"><code>preserveDrawingBuffer</code></td>
<td class="type">
<span class="param-type">boolean</span>
</td>
<td class="attributes">
<optional><br>
</td>
<td class="default">
false
</td>
<td class="description last"><p>Whether to preserve WebGL buffers until manually cleared</p></td>
</tr>
<tr>
<td class="name"><code>targetfps</code></td>
<td class="type">
<span class="param-type">number</span>
</td>
<td class="attributes">
<optional><br>
</td>
<td class="default">
30
</td>
<td class="description last"><p>Target frames per second for rendering</p></td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source method-doc-label method-doc-details-label">Source:</dt>
<dd class="tag-source">
<ul class="dummy">
<li>
<a href="Canvas.js.html">Canvas.js</a>,
<a href="Canvas.js.html#sunlight-1-line-16">line 16</a>
</li>
</ul>
</dd>
</dl>
<h5>Fires:</h5>
<ul>
<li><a href="Canvas.html#event:update">Canvas#event:update</a></li>
<li><a href="Canvas.html#event:updateSize">Canvas#event:updateSize</a></li>
<li><a href="Canvas.html#event:ready">Canvas#event:ready</a></li>
</ul>
</dd>
</div>
<h3 class="subsection-title">Methods</h3>
<dl>
<hr>
<dt>
<h4 class="name" id="addLayer"><span class="type-signature"></span>addLayer(id, layer)</h4>
</dt>
<dd>
<div class="description">
<p>Adds a layer to the canvas.</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>id</code></td>
<td class="type">
<span class="param-type">string</span>
</td>
<td class="description last"><p>Unique identifier for the layer</p></td>
</tr>
<tr>
<td class="name"><code>layer</code></td>
<td class="type">
<span class="param-type"><a href="Layer.html">Layer</a></span>
</td>
<td class="description last"><p>Layer instance to add</p></td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source method-doc-label method-doc-details-label">Source:</dt>
<dd class="tag-source">
<ul class="dummy">
<li>
<a href="Canvas.js.html">Canvas.js</a>,
<a href="Canvas.js.html#sunlight-1-line-194">line 194</a>
</li>
</ul>
</dd>
</dl>
<h5>Fires:</h5>
<ul>
<li><a href="Canvas.html#event:update">Canvas#event:update</a></li>
<li><a href="Canvas.html#event:ready">Canvas#event:ready</a></li>
</ul>
<h5>Throws:</h5>
<dl>
<dt>
<div class="param-desc">
<p>If layer ID already exists</p>
</div>
</dt>
<dt>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">Error</span>
</dd>
</dl>
</dt>
</dl>
</dd>
<hr>
<dt>
<h4 class="name" id="getState"><span class="type-signature"></span>getState( [stateMask])</h4>
</dt>
<dd>
<div class="description">
<p>Retrieves current state of the canvas and its components.</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>stateMask</code></td>
<td class="type">
<span class="param-type">Object</span>
</td>
<td class="attributes">
<optional><br>
</td>
<td class="default">
null
</td>
<td class="description last"><p>Optional mask to filter returned state properties</p></td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source method-doc-label method-doc-details-label">Source:</dt>
<dd class="tag-source">
<ul class="dummy">
<li>
<a href="Canvas.js.html">Canvas.js</a>,
<a href="Canvas.js.html#sunlight-1-line-148">line 148</a>
</li>
</ul>
</dd>
</dl>
<h5>Returns:</h5>
<div class="param-desc">
<p>Current state object</p>
</div>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">Object</span>
</dd>
</dl>
</dd>
<hr>
<dt>
<h4 class="name" id="removeLayer"><span class="type-signature"></span>removeLayer(layer)</h4>
</dt>
<dd>
<div class="description">
<p>Removes a layer from the canvas.</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>layer</code></td>
<td class="type">
<span class="param-type"><a href="Layer.html">Layer</a></span>