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<title>ZoomBlur | QtGraphicalEffects 5.2</title>
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<li>Qt 5.2</li>
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Qt 5.2.1 Reference Documentation</li>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#properties">Properties</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
<li class="level2"><a href="#example">Example</a></li>
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<h1 class="title">ZoomBlur</h1>
<span class="subtitle"></span>
<!-- $$$ZoomBlur-brief -->
<p>Applies directional blur effect towards source items center point. <a href="#details">More...</a></p>
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<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> Import Statement:</td><td class="memItemRight bottomAlign"> </b><tt>import QtGraphicalEffects 1.0</tt></td></tr><tr><td class="memItemLeft rightAlign topAlign"> Since:</td><td class="memItemRight bottomAlign"> QtGraphicalEffects 1.0</td></tr></table><ul>
<li><a href="qml-qtgraphicaleffects-zoomblur-members.html">List of all members, including inherited members</a></li>
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<a name="properties"></a>
<h2>Properties</h2>
<ul>
<li class="fn"><b><b><a href="qml-qtgraphicaleffects-zoomblur.html#cached-prop">cached</a></b></b> : bool</li>
<li class="fn"><b><b><a href="qml-qtgraphicaleffects-zoomblur.html#horizontalOffset-prop">horizontalOffset</a></b></b> : real</li>
<li class="fn"><b><b><a href="qml-qtgraphicaleffects-zoomblur.html#length-prop">length</a></b></b> : real</li>
<li class="fn"><b><b><a href="qml-qtgraphicaleffects-zoomblur.html#samples-prop">samples</a></b></b> : int</li>
<li class="fn"><b><b><a href="qml-qtgraphicaleffects-zoomblur.html#source-prop">source</a></b></b> : variant</li>
<li class="fn"><b><b><a href="qml-qtgraphicaleffects-zoomblur.html#transparentBorder-prop">transparentBorder</a></b></b> : bool</li>
<li class="fn"><b><b><a href="qml-qtgraphicaleffects-zoomblur.html#verticalOffset-prop">verticalOffset</a></b></b> : real</li>
</ul>
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<a name="details"></a>
<h2>Detailed Description</h2>
<p>Effect creates perceived impression that the source item appears to be moving towards the center point in Z-direction or that the camera appears to be zooming rapidly. Other available motion blur effects are <a href="qml-qtgraphicaleffects-directionalblur.html">DirectionalBlur</a> and <a href="qml-qtgraphicaleffects-radialblur.html">RadialBlur</a>.</p>
<table class="generic">
<thead><tr class="qt-style"><th >Source</th><th >Effect applied</th></tr></thead>
<tr valign="top" class="odd"><td ><p class="centerAlign"><img src="images/Original_bug.png" alt="" /></p></td><td ><p class="centerAlign"><img src="images/ZoomBlur_bug.png" alt="" /></p></td></tr>
</table>
<a name="example"></a>
<h2>Example</h2>
<p>The following example shows how to apply the effect.</p>
<pre class="qml">import QtQuick 2.0
import QtGraphicalEffects 1.0
<span class="type">Item</span> {
<span class="name">width</span>: <span class="number">300</span>
<span class="name">height</span>: <span class="number">300</span>
<span class="type">Image</span> {
<span class="name">id</span>: <span class="name">butterfly</span>
<span class="name">source</span>: <span class="string">"images/bug.jpg"</span>
<span class="name">sourceSize</span>: <span class="name">Qt</span>.<span class="name">size</span>(<span class="name">parent</span>.<span class="name">width</span>, <span class="name">parent</span>.<span class="name">height</span>)
<span class="name">smooth</span>: <span class="number">true</span>
<span class="name">visible</span>: <span class="number">false</span>
}
<span class="type">ZoomBlur</span> {
<span class="name">anchors</span>.fill: <span class="name">butterfly</span>
<span class="name">source</span>: <span class="name">butterfly</span>
<span class="name">samples</span>: <span class="number">24</span>
<span class="name">length</span>: <span class="number">48</span>
}
}</pre>
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<h2>Property Documentation</h2>
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<div class="qmlitem"><div class="qmlproto"><table class="qmlname"><tr valign="top" class="odd"><td class="tblQmlPropNode"><p><a name="cached-prop"></a><span class="name">cached</span> : <span class="type">bool</span></p></td></tr></table></div><div class="qmldoc"><p>This property allows the effect output pixels to be cached in order to improve the rendering performance.</p>
<p>Every time the source or effect properties are changed, the pixels in the cache must be updated. Memory consumption is increased, because an extra buffer of memory is required for storing the effect output.</p>
<p>It is recommended to disable the cache when the source or the effect properties are animated.</p>
<p>By default, the property is set to <tt>false</tt>.</p>
</div></div><!-- @@@cached -->
<br/>
<!-- $$$horizontalOffset -->
<div class="qmlitem"><div class="qmlproto"><table class="qmlname"><tr valign="top" class="odd"><td class="tblQmlPropNode"><p><a name="horizontalOffset-prop"></a><span class="name">horizontalOffset</span> : <span class="type">real</span></p></td></tr></table></div><div class="qmldoc"><p>These properties define an offset in pixels for the blur direction center point.</p>
<p>The values range from -inf to inf. By default these properties are set to <tt>0</tt>.</p>
<table class="generic">
<thead><tr class="qt-style"><th >Output examples with different horizontalOffset values</th><th ></th><th ></th></tr></thead>
<tr valign="top" class="odd"><td ><p class="centerAlign"><img src="images/ZoomBlur_horizontalOffset1.png" alt="" /></p></td><td ><p class="centerAlign"><img src="images/ZoomBlur_horizontalOffset2.png" alt="" /></p></td><td ><p class="centerAlign"><img src="images/ZoomBlur_horizontalOffset3.png" alt="" /></p></td></tr>
<tr valign="top" class="even"><td ><b> horizontalOffset: 100.0 </b></td><td ><b> horizontalOffset: 0.0 </b></td><td ><b> horizontalOffset: -100.0 </b></td></tr>
<tr valign="top" class="odd"><td ><a href="qml-qtgraphicaleffects-zoomblur.html#samples-prop">samples</a>: 24</td><td ><a href="qml-qtgraphicaleffects-zoomblur.html#samples-prop">samples</a>: 24</td><td ><a href="qml-qtgraphicaleffects-zoomblur.html#samples-prop">samples</a>: 24</td></tr>
<tr valign="top" class="even"><td ><a href="qml-qtgraphicaleffects-zoomblur.html#length-prop">length</a>: 32</td><td ><a href="qml-qtgraphicaleffects-zoomblur.html#length-prop">length</a>: 32</td><td ><a href="qml-qtgraphicaleffects-zoomblur.html#length-prop">length</a>: 32</td></tr>
<tr valign="top" class="odd"><td ><a href="qml-qtgraphicaleffects-zoomblur.html#verticalOffset-prop">verticalOffset</a>: 0</td><td ><a href="qml-qtgraphicaleffects-zoomblur.html#verticalOffset-prop">verticalOffset</a>: 0</td><td ><a href="qml-qtgraphicaleffects-zoomblur.html#verticalOffset-prop">verticalOffset</a>: 0</td></tr>
</table>
</div></div><!-- @@@horizontalOffset -->
<br/>
<!-- $$$length -->
<div class="qmlitem"><div class="qmlproto"><table class="qmlname"><tr valign="top" class="odd"><td class="tblQmlPropNode"><p><a name="length-prop"></a><span class="name">length</span> : <span class="type">real</span></p></td></tr></table></div><div class="qmldoc"><p>This property defines the maximum perceived amount of movement for each pixel. The amount is smaller near the center and reaches the specified value at the edges.</p>
<p>The quality of the blur depends on <a href="qml-qtgraphicaleffects-zoomblur.html#samples-prop">samples</a> property. If length value is large, more samples are needed to keep the visual quality at high level.</p>
<p>The value ranges from 0.0 to inf. By default the property is set to <tt>0.0</tt> (no blur).</p>
<table class="generic">
<thead><tr class="qt-style"><th >Output examples with different length values</th><th ></th><th ></th></tr></thead>
<tr valign="top" class="odd"><td ><p class="centerAlign"><img src="images/ZoomBlur_length1.png" alt="" /></p></td><td ><p class="centerAlign"><img src="images/ZoomBlur_length2.png" alt="" /></p></td><td ><p class="centerAlign"><img src="images/ZoomBlur_length3.png" alt="" /></p></td></tr>
<tr valign="top" class="even"><td ><b> length: 0.0 </b></td><td ><b> length: 32.0 </b></td><td ><b> length: 48.0 </b></td></tr>
<tr valign="top" class="odd"><td ><a href="qml-qtgraphicaleffects-zoomblur.html#samples-prop">samples</a>: 24</td><td ><a href="qml-qtgraphicaleffects-zoomblur.html#samples-prop">samples</a>: 24</td><td ><a href="qml-qtgraphicaleffects-zoomblur.html#samples-prop">samples</a>: 24</td></tr>
<tr valign="top" class="even"><td ><a href="qml-qtgraphicaleffects-zoomblur.html#horizontalOffset-prop">horizontalOffset</a>: 0</td><td ><a href="qml-qtgraphicaleffects-zoomblur.html#horizontalOffset-prop">horizontalOffset</a>: 0</td><td ><a href="qml-qtgraphicaleffects-zoomblur.html#horizontalOffset-prop">horizontalOffset</a>: 0</td></tr>
<tr valign="top" class="odd"><td ><a href="qml-qtgraphicaleffects-zoomblur.html#verticalOffset-prop">verticalOffset</a>: 0</td><td ><a href="qml-qtgraphicaleffects-zoomblur.html#verticalOffset-prop">verticalOffset</a>: 0</td><td ><a href="qml-qtgraphicaleffects-zoomblur.html#verticalOffset-prop">verticalOffset</a>: 0</td></tr>
</table>
</div></div><!-- @@@length -->
<br/>
<!-- $$$samples -->
<div class="qmlitem"><div class="qmlproto"><table class="qmlname"><tr valign="top" class="odd"><td class="tblQmlPropNode"><p><a name="samples-prop"></a><span class="name">samples</span> : <span class="type">int</span></p></td></tr></table></div><div class="qmldoc"><p>This property defines how many samples are taken per pixel when blur calculation is done. Larger value produces better quality, but is slower to render.</p>
<p>This property is not intended to be animated. Changing this property may cause the underlying OpenGL shaders to be recompiled.</p>
<p>Allowed values are between 0 and inf (practical maximum depends on GPU). By default the property is set to <tt>0</tt> (no samples).</p>
</div></div><!-- @@@samples -->
<br/>
<!-- $$$source -->
<div class="qmlitem"><div class="qmlproto"><table class="qmlname"><tr valign="top" class="odd"><td class="tblQmlPropNode"><p><a name="source-prop"></a><span class="name">source</span> : <span class="type">variant</span></p></td></tr></table></div><div class="qmldoc"><p>This property defines the source item that is going to be blurred.</p>
<p><b>Note: </b>It is not supported to let the effect include itself, for instance by setting source to the effect's parent.</p></div></div><!-- @@@source -->
<br/>
<!-- $$$transparentBorder -->
<div class="qmlitem"><div class="qmlproto"><table class="qmlname"><tr valign="top" class="odd"><td class="tblQmlPropNode"><p><a name="transparentBorder-prop"></a><span class="name">transparentBorder</span> : <span class="type">bool</span></p></td></tr></table></div><div class="qmldoc"><p>This property defines the blur behavior near the edges of the item, where the pixel blurring is affected by the pixels outside the source edges.</p>
<p>If the property is set to <tt>true</tt>, the pixels outside the source are interpreted to be transparent, which is similar to OpenGL clamp-to-border extension. The blur is expanded slightly outside the effect item area.</p>
<p>If the property is set to <tt>false</tt>, the pixels outside the source are interpreted to contain the same color as the pixels at the edge of the item, which is similar to OpenGL clamp-to-edge behavior. The blur does not expand outside the effect item area.</p>
<p>By default, the property is set to <tt>false</tt>.</p>
</div></div><!-- @@@transparentBorder -->
<br/>
<!-- $$$verticalOffset -->
<div class="qmlitem"><div class="qmlproto"><table class="qmlname"><tr valign="top" class="odd"><td class="tblQmlPropNode"><p><a name="verticalOffset-prop"></a><span class="name">verticalOffset</span> : <span class="type">real</span></p></td></tr></table></div><div class="qmldoc"><p>These properties define an offset in pixels for the blur direction center point.</p>
<p>The values range from -inf to inf. By default these properties are set to <tt>0</tt>.</p>
<table class="generic">
<thead><tr class="qt-style"><th >Output examples with different <a href="qml-qtgraphicaleffects-zoomblur.html#horizontalOffset-prop">horizontalOffset</a> values</th><th ></th><th ></th></tr></thead>
<tr valign="top" class="odd"><td ><p class="centerAlign"><img src="images/ZoomBlur_horizontalOffset1.png" alt="" /></p></td><td ><p class="centerAlign"><img src="images/ZoomBlur_horizontalOffset2.png" alt="" /></p></td><td ><p class="centerAlign"><img src="images/ZoomBlur_horizontalOffset3.png" alt="" /></p></td></tr>
<tr valign="top" class="even"><td ><b> <a href="qml-qtgraphicaleffects-zoomblur.html#horizontalOffset-prop">horizontalOffset</a>: 100.0 </b></td><td ><b> <a href="qml-qtgraphicaleffects-zoomblur.html#horizontalOffset-prop">horizontalOffset</a>: 0.0 </b></td><td ><b> <a href="qml-qtgraphicaleffects-zoomblur.html#horizontalOffset-prop">horizontalOffset</a>: -100.0 </b></td></tr>
<tr valign="top" class="odd"><td ><a href="qml-qtgraphicaleffects-zoomblur.html#samples-prop">samples</a>: 24</td><td ><a href="qml-qtgraphicaleffects-zoomblur.html#samples-prop">samples</a>: 24</td><td ><a href="qml-qtgraphicaleffects-zoomblur.html#samples-prop">samples</a>: 24</td></tr>
<tr valign="top" class="even"><td ><a href="qml-qtgraphicaleffects-zoomblur.html#length-prop">length</a>: 32</td><td ><a href="qml-qtgraphicaleffects-zoomblur.html#length-prop">length</a>: 32</td><td ><a href="qml-qtgraphicaleffects-zoomblur.html#length-prop">length</a>: 32</td></tr>
<tr valign="top" class="odd"><td >verticalOffset: 0</td><td >verticalOffset: 0</td><td >verticalOffset: 0</td></tr>
</table>
</div></div><!-- @@@verticalOffset -->
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