1575 lines
26 KiB
HTML
1575 lines
26 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<title>OpenLayers 3 API Documentation - Class: ol.View2D</title>
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<div class="navbar navbar-inverse navbar-fixed-top">
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<div class="navbar-inner">
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<div class="container">
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<a class="brand" href="./">OpenLayers 3 API Documentation - Class: ol.View2D</a>
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<ul class="nav pull-right">
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<li><iframe class="github-watch-button" src="http://ghbtns.com/github-btn.html?user=openlayers&repo=ol3&type=watch&count=true"
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<div id="main">
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<section>
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<header>
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<h2>
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<span class="ancestors"><a href="ol.html">ol</a>.</span>
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ol.View2D
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</h2>
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<div class="class-description"><p>An ol.View2D object represents a simple 2D view of the map.</p>
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<p>This is the object to act upon to change the center, resolution,
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and rotation of the map.</p>
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<h3>The view states</h3>
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<p>An <code>ol.View2D</code> is determined by three states: <code>center</code>, <code>resolution</code>,
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and <code>rotation</code>. To each state corresponds a getter and a setter. E.g.
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<code>getCenter</code> and <code>setCenter</code> for the <code>center</code> state.</p>
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<p>An <code>ol.View2D</code> has a <code>projection</code>. The projection determines the
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coordinate system of the center, and its units determine the units of the
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resolution (projection units per pixel). The default projection is
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Spherical Mercator (EPSG:3857).</p>
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<h3>The constraints</h3>
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<p><code>setCenter</code>, <code>setResolution</code> and <code>setRotation</code> can be used to change the
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states of the view. Any value can be passed to the setters. And the value
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that is passed to a setter will effectively be the value set in the view,
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and returned by the corresponding getter.</p>
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<p>But an <code>ol.View2D</code> object also has a <em>resolution constraint</em> and a
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<em>rotation constraint</em>. There's currently no <em>center constraint</em>, but
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this may change in the future.</p>
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<p>As said above no constraints are applied when the setters are used to set
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new states for the view. Applying constraints is done explicitly through
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the use of the <code>constrain*</code> functions (<code>constrainResolution</code> and
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<code>constrainRotation</code>).</p>
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<p>The main users of the constraints are the interactions and the
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controls. For example, double-clicking on the map changes the view to
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the "next" resolution. And releasing the fingers after pinch-zooming
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snaps to the closest resolution (with an animation).</p>
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<p>So the <em>resolution constraint</em> snaps to specific resolutions. It is
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determined by the following options: <code>resolutions</code>, <code>maxResolution</code>,
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<code>maxZoom</code>, and <code>zoomFactor</code>. If <code>resolutions</code> is set, the other three
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options are ignored. See <a href="ol.html#View2DOptions">ol.View2DOptions</a> for more information.</p>
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<p>The <em>rotation constaint</em> is currently not configurable. It snaps the
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rotation value to zero when approaching the horizontal.</p></div>
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</header>
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<article>
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<div class="container-overview">
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<dt>
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<h4 class="name" id="View2D"><span class="type-signature"></span>new View2D</h4>
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</dt>
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<dd>
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<h5>Parameters:</h5>
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<table class="params">
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<thead>
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<tr>
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<th>Name</th>
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<th>Type</th>
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<th>Argument</th>
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<th class="last">Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td class="name"><code>options</code></td>
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<td class="type">
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<span class="param-type"><a href="ol.html#View2DOptions">ol.View2DOptions</a></span>
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</td>
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<td class="attributes">
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<optional><br>
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</td>
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<td class="description last">(Optional) <p>View2D options.</p></td>
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</tr>
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</tbody>
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</table>
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<dl class="details">
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<dt class="tag-source">Source:</dt>
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<dd class="tag-source"><ul class="dummy"><li>view2d.js, line 87</li></ul></dd>
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</dl>
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</dd>
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</div>
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<h3 class="subsection-title">Methods</h3>
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<dl>
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<dt>
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<h4 class="name" id="calculateExtent"><span class="type-signature"></span>calculateExtent</h4>
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</dt>
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<dd>
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<div class="description">
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<p>Calculate the extent for the given size in pixels, based on the current
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resolution and the current center.</p>
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</div>
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<h5>Parameters:</h5>
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<table class="params">
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<thead>
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<tr>
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<th>Name</th>
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<th>Type</th>
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<th class="last">Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td class="name"><code>size</code></td>
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<td class="type">
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<span class="param-type"><a href="ol.html#Size">ol.Size</a></span>
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</td>
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<td class="description last"><p>Box pixel size.</p></td>
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</tr>
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</tbody>
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</table>
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<dl class="details">
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<dt class="tag-source">Source:</dt>
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<dd class="tag-source"><ul class="dummy"><li>view2d.js, line 221</li></ul></dd>
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</dl>
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<h5>Returns:</h5>
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<div class="param-desc">
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<p>Extent.</p>
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</div>
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<dl>
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<dt>
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Type
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</dt>
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<dd>
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<span class="param-type">ol.Extent</span>
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</dd>
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</dl>
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</dd>
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<dt>
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<h4 class="name" id="constrainResolution"><span class="type-signature"></span>constrainResolution</h4>
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</dt>
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<dd>
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<div class="description">
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<p>Get the constrained the resolution of this view.</p>
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</div>
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<h5>Parameters:</h5>
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<table class="params">
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<thead>
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<tr>
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<th>Name</th>
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<th>Type</th>
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<th>Argument</th>
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<th class="last">Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td class="name"><code>resolution</code></td>
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<td class="type">
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<span class="param-type">number</span>
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<span class="param-type">undefined</span>
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</td>
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<td class="attributes">
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</td>
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<td class="description last"><p>Resolution.</p></td>
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</tr>
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<tr>
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<td class="name"><code>delta</code></td>
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<td class="type">
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<span class="param-type">number</span>
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</td>
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<td class="attributes">
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<optional><br>
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</td>
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<td class="description last">(Optional) <p>Delta.</p></td>
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</tr>
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<tr>
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<td class="name"><code>direction</code></td>
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<td class="type">
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<span class="param-type">number</span>
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</td>
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<td class="attributes">
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<optional><br>
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</td>
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<td class="description last">(Optional) <p>Direction.</p></td>
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</tr>
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</tbody>
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</table>
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<dl class="details">
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<dt class="tag-source">Source:</dt>
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<dd class="tag-source"><ul class="dummy"><li>view2d.js, line 182</li></ul></dd>
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</dl>
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<h5>Returns:</h5>
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<div class="param-desc">
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<p>Constrained resolution.</p>
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</div>
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<dl>
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<dt>
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Type
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</dt>
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<dd>
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<span class="param-type">number</span>
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<span class="param-type">undefined</span>
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</dd>
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</dl>
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</dd>
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<dt>
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<h4 class="name" id="constrainRotation"><span class="type-signature"></span>constrainRotation</h4>
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</dt>
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<dd>
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<div class="description">
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<p>Get the constrained rotation of this view.</p>
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</div>
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<h5>Parameters:</h5>
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<table class="params">
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<thead>
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<tr>
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<th>Name</th>
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<th>Type</th>
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<th>Argument</th>
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<th class="last">Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td class="name"><code>rotation</code></td>
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<td class="type">
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<span class="param-type">number</span>
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<span class="param-type">undefined</span>
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</td>
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<td class="attributes">
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</td>
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<td class="description last"><p>Rotation.</p></td>
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</tr>
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<tr>
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<td class="name"><code>delta</code></td>
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<td class="type">
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<span class="param-type">number</span>
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</td>
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<td class="attributes">
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<optional><br>
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</td>
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<td class="description last">(Optional) <p>Delta.</p></td>
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</tr>
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</tbody>
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</table>
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<dl class="details">
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<dt class="tag-source">Source:</dt>
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<dd class="tag-source"><ul class="dummy"><li>view2d.js, line 196</li></ul></dd>
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</dl>
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<h5>Returns:</h5>
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<div class="param-desc">
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<p>Constrained rotation.</p>
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</div>
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<dl>
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<dt>
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Type
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</dt>
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<dd>
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<span class="param-type">number</span>
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<span class="param-type">undefined</span>
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</dd>
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</dl>
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</dd>
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<dt>
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<h4 class="name" id="fitExtent"><span class="type-signature"></span>fitExtent</h4>
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</dt>
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<dd>
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<div class="description">
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<p>Fit the given extent based on the given map size.</p>
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</div>
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<h5>Parameters:</h5>
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<table class="params">
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<thead>
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<tr>
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<th>Name</th>
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<th>Type</th>
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<th class="last">Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td class="name"><code>extent</code></td>
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<td class="type">
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<span class="param-type">ol.Extent</span>
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</td>
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<td class="description last"><p>Extent.</p></td>
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</tr>
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<tr>
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<td class="name"><code>size</code></td>
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<td class="type">
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<span class="param-type"><a href="ol.html#Size">ol.Size</a></span>
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</td>
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<td class="description last"><p>Box pixel size.</p></td>
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</tr>
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</tbody>
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</table>
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<dl class="details">
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<dt class="tag-source">Source:</dt>
|
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<dd class="tag-source"><ul class="dummy"><li>view2d.js, line 396</li></ul></dd>
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</dl>
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</dd>
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<dt>
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|
<h4 class="name" id="getZoom"><span class="type-signature"></span>getZoom</h4>
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</dt>
|
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<dd>
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<div class="description">
|
|
<p>Get the current zoom level. Return undefined if the current
|
|
resolution is undefined or not a "constrained resolution".</p>
|
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</div>
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<dl class="details">
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<dt class="tag-source">Source:</dt>
|
|
<dd class="tag-source"><ul class="dummy"><li>view2d.js, line 371</li></ul></dd>
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</dl>
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<h5>Returns:</h5>
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|
|
<div class="param-desc">
|
|
<p>Zoom.</p>
|
|
</div>
|
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|
|
<dl>
|
|
<dt>
|
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Type
|
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</dt>
|
|
<dd>
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|
|
<span class="param-type">number</span>
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|
|
<span class="param-type">undefined</span>
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</dd>
|
|
</dl>
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</dd>
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<dt>
|
|
<h4 class="name" id="setCenter"><span class="type-signature"></span>setCenter</h4>
|
|
|
|
|
|
</dt>
|
|
<dd>
|
|
|
|
|
|
<div class="description">
|
|
<p>Set the center of the current view.</p>
|
|
</div>
|
|
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<h5>Parameters:</h5>
|
|
|
|
|
|
<table class="params">
|
|
<thead>
|
|
<tr>
|
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|
|
<th>Name</th>
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|
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|
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<th>Type</th>
|
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|
|
<th class="last">Description</th>
|
|
</tr>
|
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</thead>
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<tbody>
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<tr>
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<td class="name"><code>center</code></td>
|
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|
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|
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<td class="type">
|
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|
|
<span class="param-type"><a href="ol.html#Coordinate">ol.Coordinate</a></span>
|
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|
|
<span class="param-type">undefined</span>
|
|
|
|
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|
|
|
</td>
|
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|
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<td class="description last"><p>Center.</p></td>
|
|
</tr>
|
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</tbody>
|
|
</table>
|
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|
<dl class="details">
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|
|
<dt class="tag-source">Source:</dt>
|
|
<dd class="tag-source"><ul class="dummy"><li>view2d.js, line 417</li></ul></dd>
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</dl>
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</dd>
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|
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<dt>
|
|
<h4 class="name" id="setProjection"><span class="type-signature"></span>setProjection</h4>
|
|
|
|
|
|
</dt>
|
|
<dd>
|
|
|
|
|
|
<div class="description">
|
|
<p>Set the projection of this view.</p>
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<h5>Parameters:</h5>
|
|
|
|
|
|
<table class="params">
|
|
<thead>
|
|
<tr>
|
|
|
|
<th>Name</th>
|
|
|
|
|
|
<th>Type</th>
|
|
|
|
|
|
|
|
|
|
|
|
<th class="last">Description</th>
|
|
</tr>
|
|
</thead>
|
|
|
|
<tbody>
|
|
|
|
|
|
<tr>
|
|
|
|
<td class="name"><code>projection</code></td>
|
|
|
|
|
|
<td class="type">
|
|
|
|
|
|
<span class="param-type"><a href="ol.Projection.html">ol.Projection</a></span>
|
|
|
|
|
|
|
<span class="param-type">undefined</span>
|
|
|
|
|
|
|
|
</td>
|
|
|
|
|
|
|
|
|
|
|
|
<td class="description last"><p>Projection.</p></td>
|
|
</tr>
|
|
|
|
|
|
</tbody>
|
|
</table>
|
|
|
|
|
|
|
|
<dl class="details">
|
|
|
|
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|
|
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|
|
|
|
<dt class="tag-source">Source:</dt>
|
|
<dd class="tag-source"><ul class="dummy"><li>view2d.js, line 430</li></ul></dd>
|
|
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|
|
</dl>
|
|
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|
|
</dd>
|
|
|
|
|
|
|
|
<dt>
|
|
<h4 class="name" id="setResolution"><span class="type-signature"></span>setResolution</h4>
|
|
|
|
|
|
</dt>
|
|
<dd>
|
|
|
|
|
|
<div class="description">
|
|
<p>Set the resolution for this view.</p>
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<h5>Parameters:</h5>
|
|
|
|
|
|
<table class="params">
|
|
<thead>
|
|
<tr>
|
|
|
|
<th>Name</th>
|
|
|
|
|
|
<th>Type</th>
|
|
|
|
|
|
|
|
|
|
|
|
<th class="last">Description</th>
|
|
</tr>
|
|
</thead>
|
|
|
|
<tbody>
|
|
|
|
|
|
<tr>
|
|
|
|
<td class="name"><code>resolution</code></td>
|
|
|
|
|
|
<td class="type">
|
|
|
|
|
|
<span class="param-type">number</span>
|
|
|
|
|
|
|
<span class="param-type">undefined</span>
|
|
|
|
|
|
|
|
</td>
|
|
|
|
|
|
|
|
|
|
|
|
<td class="description last"><p>Resolution.</p></td>
|
|
</tr>
|
|
|
|
|
|
</tbody>
|
|
</table>
|
|
|
|
|
|
|
|
<dl class="details">
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<dt class="tag-source">Source:</dt>
|
|
<dd class="tag-source"><ul class="dummy"><li>view2d.js, line 443</li></ul></dd>
|
|
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|
|
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|
|
|
|
|
|
</dl>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
</dd>
|
|
|
|
|
|
|
|
<dt>
|
|
<h4 class="name" id="setRotation"><span class="type-signature"></span>setRotation</h4>
|
|
|
|
|
|
</dt>
|
|
<dd>
|
|
|
|
|
|
<div class="description">
|
|
<p>Set the rotation for this view.</p>
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<h5>Parameters:</h5>
|
|
|
|
|
|
<table class="params">
|
|
<thead>
|
|
<tr>
|
|
|
|
<th>Name</th>
|
|
|
|
|
|
<th>Type</th>
|
|
|
|
|
|
|
|
|
|
|
|
<th class="last">Description</th>
|
|
</tr>
|
|
</thead>
|
|
|
|
<tbody>
|
|
|
|
|
|
<tr>
|
|
|
|
<td class="name"><code>rotation</code></td>
|
|
|
|
|
|
<td class="type">
|
|
|
|
|
|
<span class="param-type">number</span>
|
|
|
|
|
|
|
<span class="param-type">undefined</span>
|
|
|
|
|
|
|
|
</td>
|
|
|
|
|
|
|
|
|
|
|
|
<td class="description last"><p>Rotation.</p></td>
|
|
</tr>
|
|
|
|
|
|
</tbody>
|
|
</table>
|
|
|
|
|
|
|
|
<dl class="details">
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<dt class="tag-source">Source:</dt>
|
|
<dd class="tag-source"><ul class="dummy"><li>view2d.js, line 456</li></ul></dd>
|
|
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|
|
|
|
|
|
|
|
|
|
|
|
|
</dl>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
</dd>
|
|
|
|
|
|
|
|
<dt>
|
|
<h4 class="name" id="setZoom"><span class="type-signature"></span>setZoom</h4>
|
|
|
|
|
|
</dt>
|
|
<dd>
|
|
|
|
|
|
<div class="description">
|
|
<p>Zoom to a specific zoom level.</p>
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<h5>Parameters:</h5>
|
|
|
|
|
|
<table class="params">
|
|
<thead>
|
|
<tr>
|
|
|
|
<th>Name</th>
|
|
|
|
|
|
<th>Type</th>
|
|
|
|
|
|
|
|
|
|
|
|
<th class="last">Description</th>
|
|
</tr>
|
|
</thead>
|
|
|
|
<tbody>
|
|
|
|
|
|
<tr>
|
|
|
|
<td class="name"><code>zoom</code></td>
|
|
|
|
|
|
<td class="type">
|
|
|
|
|
|
<span class="param-type">number</span>
|
|
|
|
|
|
|
|
</td>
|
|
|
|
|
|
|
|
|
|
|
|
<td class="description last"><p>Zoom level.</p></td>
|
|
</tr>
|
|
|
|
|
|
</tbody>
|
|
</table>
|
|
|
|
|
|
|
|
<dl class="details">
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<dt class="tag-source">Source:</dt>
|
|
<dd class="tag-source"><ul class="dummy"><li>view2d.js, line 469</li></ul></dd>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
</dl>
|
|
|
|
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|
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|
|
|
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|
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|
|
|
|
|
</dd>
|
|
|
|
</dl>
|
|
|
|
|
|
|
|
|
|
|
|
</article>
|
|
|
|
</section>
|
|
|
|
|
|
|
|
|
|
</div>
|
|
|
|
<nav>
|
|
<h2><a href="index.html">Index</a></h2><h3>Classes</h3><ul><li><a href="ol.Attribution.html">ol.Attribution</a></li><li><a href="ol.Collection.html">ol.Collection</a></li><li><a href="ol.DeviceOrientation.html">ol.DeviceOrientation</a></li><li><a href="ol.Feature.html">ol.Feature</a></li><li><a href="ol.Geolocation.html">ol.Geolocation</a></li><li><a href="ol.Map.html">ol.Map</a></li><li><a href="ol.MapBrowserEvent.html">ol.MapBrowserEvent</a></li><li><a href="ol.Object.html">ol.Object</a></li><li><a href="ol.Overlay.html">ol.Overlay</a></li><li><a href="ol.Projection.html">ol.Projection</a></li><li><a href="ol.View2D.html">ol.View2D</a></li><li><a href="ol.control.Attribution.html">ol.control.Attribution</a></li><li><a href="ol.control.Control.html">ol.control.Control</a></li><li><a href="ol.control.FullScreen.html">ol.control.FullScreen</a></li><li><a href="ol.control.Logo.html">ol.control.Logo</a></li><li><a href="ol.control.MousePosition.html">ol.control.MousePosition</a></li><li><a href="ol.control.ScaleLine.html">ol.control.ScaleLine</a></li><li><a href="ol.control.Zoom.html">ol.control.Zoom</a></li><li><a href="ol.control.ZoomSlider.html">ol.control.ZoomSlider</a></li><li><a href="ol.control.ZoomToExtent.html">ol.control.ZoomToExtent</a></li><li><a href="ol.dom.Input.html">ol.dom.Input</a></li><li><a href="ol.geom.Geometry.html">ol.geom.Geometry</a></li><li><a href="ol.geom.LineString.html">ol.geom.LineString</a></li><li><a href="ol.geom.MultiLineString.html">ol.geom.MultiLineString</a></li><li><a href="ol.geom.MultiPoint.html">ol.geom.MultiPoint</a></li><li><a href="ol.geom.MultiPolygon.html">ol.geom.MultiPolygon</a></li><li><a href="ol.geom.Point.html">ol.geom.Point</a></li><li><a href="ol.geom.Polygon.html">ol.geom.Polygon</a></li><li><a href="ol.geom.SharedVertices.html">ol.geom.SharedVertices</a></li><li><a href="ol.geom2.LineStringCollection.html">ol.geom2.LineStringCollection</a></li><li><a href="ol.geom2.PointCollection.html">ol.geom2.PointCollection</a></li><li><a href="ol.interaction.DragRotateAndZoom.html">ol.interaction.DragRotateAndZoom</a></li><li><a href="ol.interaction.Modify.html">ol.interaction.Modify</a></li><li><a href="ol.interaction.Select.html">ol.interaction.Select</a></li><li><a href="ol.layer.Group.html">ol.layer.Group</a></li><li><a href="ol.layer.Image.html">ol.layer.Image</a></li><li><a href="ol.layer.Layer.html">ol.layer.Layer</a></li><li><a href="ol.layer.Tile.html">ol.layer.Tile</a></li><li><a href="ol.layer.Vector.html">ol.layer.Vector</a></li><li><a href="ol.layer.Vector2.html">ol.layer.Vector2</a></li><li><a href="ol.parser.GPX.html">ol.parser.GPX</a></li><li><a href="ol.parser.GeoJSON.html">ol.parser.GeoJSON</a></li><li><a href="ol.parser.KML.html">ol.parser.KML</a></li><li><a href="ol.parser.TopoJSON.html">ol.parser.TopoJSON</a></li><li><a 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