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<title>RadialGradient | QtGraphicalEffects 5.2</title>
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<li>Qt 5.2</li>
<li><a href="qtgraphicaleffects-index.html">Qt Graphical Effects</a></li>
<li><a href="graphicaleffects.html">QML Types</a></li>
<li>RadialGradient</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">RadialGradient</h1>
<span class="subtitle"></span>
<!-- $$$RadialGradient-brief -->
<p>Draws a radial gradient. <a href="#details">More...</a></p>
<!-- @@@RadialGradient -->
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> Import Statement:</td><td class="memItemRight bottomAlign"> </b><tt>import QtGraphicalEffects 1.0</tt></td></tr><tr><td class="memItemLeft rightAlign topAlign"> Since:</td><td class="memItemRight bottomAlign"> QtGraphicalEffects 1.0</td></tr></table><ul>
<li><a href="qml-qtgraphicaleffects-radialgradient-members.html">List of all members, including inherited members</a></li>
</ul>
<a name="properties"></a>
<h2>Properties</h2>
<ul>
<li class="fn"><b><b><a href="qml-qtgraphicaleffects-radialgradient.html#angle-prop">angle</a></b></b> : real</li>
<li class="fn"><b><b><a href="qml-qtgraphicaleffects-radialgradient.html#cached-prop">cached</a></b></b> : bool</li>
<li class="fn"><b><b><a href="qml-qtgraphicaleffects-radialgradient.html#gradient-prop">gradient</a></b></b> : Gradient</li>
<li class="fn"><b><b><a href="qml-qtgraphicaleffects-radialgradient.html#horizontalOffset-prop">horizontalOffset</a></b></b> : real</li>
<li class="fn"><b><b><a href="qml-qtgraphicaleffects-radialgradient.html#horizontalRadius-prop">horizontalRadius</a></b></b> : real</li>
<li class="fn"><b><b><a href="qml-qtgraphicaleffects-radialgradient.html#source-prop">source</a></b></b> : variant</li>
<li class="fn"><b><b><a href="qml-qtgraphicaleffects-radialgradient.html#verticalOffset-prop">verticalOffset</a></b></b> : real</li>
<li class="fn"><b><b><a href="qml-qtgraphicaleffects-radialgradient.html#verticalRadius-prop">verticalRadius</a></b></b> : real</li>
</ul>
<!-- $$$RadialGradient-description -->
<a name="details"></a>
<h2>Detailed Description</h2>
<p>A gradient is defined by two or more colors, which are blended seamlessly. The colors start from the middle of the item and end at the borders.</p>
<table class="generic">
<thead><tr class="qt-style"><th >Effect applied</th></tr></thead>
<tr valign="top" class="odd"><td ><p class="centerAlign"><img src="images/RadialGradient.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">RadialGradient</span> {
<span class="name">anchors</span>.fill: <span class="name">parent</span>
<span class="name">gradient</span>: <span class="name">Gradient</span> {
<span class="type">GradientStop</span> { <span class="name">position</span>: <span class="number">0.0</span>; <span class="name">color</span>: <span class="string">"white"</span> }
<span class="type">GradientStop</span> { <span class="name">position</span>: <span class="number">0.5</span>; <span class="name">color</span>: <span class="string">"black"</span> }
}
}
}</pre>
<!-- @@@RadialGradient -->
<h2>Property Documentation</h2>
<!-- $$$angle -->
<div class="qmlitem"><div class="qmlproto"><table class="qmlname"><tr valign="top" class="odd"><td class="tblQmlPropNode"><p><a name="angle-prop"></a><span class="name">angle</span> : <span class="type">real</span></p></td></tr></table></div><div class="qmldoc"><p>This property defines the rotation of the gradient around its center point. The rotation is only visible when the <a href="qml-qtgraphicaleffects-radialgradient.html#horizontalRadius-prop">horizontalRadius</a> and <a href="qml-qtgraphicaleffects-radialgradient.html#verticalRadius-prop">verticalRadius</a> properties are not equal. The angle is given in degrees and the default value is <tt>0</tt>.</p>
<table class="generic">
<thead><tr class="qt-style"><th >Output examples with different angle values</th><th ></th><th ></th></tr></thead>
<tr valign="top" class="odd"><td ><p class="centerAlign"><img src="images/RadialGradient_angle1.png" alt="" /></p></td><td ><p class="centerAlign"><img src="images/RadialGradient_angle2.png" alt="" /></p></td><td ><p class="centerAlign"><img src="images/RadialGradient_angle3.png" alt="" /></p></td></tr>
<tr valign="top" class="even"><td ><b> angle: 0 </b></td><td ><b> angle: 45 </b></td><td ><b> angle: 90 </b></td></tr>
<tr valign="top" class="odd"><td ><a href="qml-qtgraphicaleffects-radialgradient.html#horizontalOffset-prop">horizontalOffset</a>: 0</td><td ><a href="qml-qtgraphicaleffects-radialgradient.html#horizontalOffset-prop">horizontalOffset</a>: 0</td><td ><a href="qml-qtgraphicaleffects-radialgradient.html#horizontalOffset-prop">horizontalOffset</a>: 0</td></tr>
<tr valign="top" class="even"><td ><a href="qml-qtgraphicaleffects-radialgradient.html#verticalOffset-prop">verticalOffset</a>: 0</td><td ><a href="qml-qtgraphicaleffects-radialgradient.html#verticalOffset-prop">verticalOffset</a>: 0</td><td ><a href="qml-qtgraphicaleffects-radialgradient.html#verticalOffset-prop">verticalOffset</a>: 0</td></tr>
<tr valign="top" class="odd"><td ><a href="qml-qtgraphicaleffects-radialgradient.html#horizontalRadius-prop">horizontalRadius</a>: 100</td><td ><a href="qml-qtgraphicaleffects-radialgradient.html#horizontalRadius-prop">horizontalRadius</a>: 100</td><td ><a href="qml-qtgraphicaleffects-radialgradient.html#horizontalRadius-prop">horizontalRadius</a>: 100</td></tr>
<tr valign="top" class="even"><td ><a href="qml-qtgraphicaleffects-radialgradient.html#verticalRadius-prop">verticalRadius</a>: 300</td><td ><a href="qml-qtgraphicaleffects-radialgradient.html#verticalRadius-prop">verticalRadius</a>: 300</td><td ><a href="qml-qtgraphicaleffects-radialgradient.html#verticalRadius-prop">verticalRadius</a>: 300</td></tr>
</table>
</div></div><!-- @@@angle -->
<br/>
<!-- $$$cached -->
<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/>
<!-- $$$gradient -->
<div class="qmlitem"><div class="qmlproto"><table class="qmlname"><tr valign="top" class="odd"><td class="tblQmlPropNode"><p><a name="gradient-prop"></a><span class="name">gradient</span> : <span class="type">Gradient</span></p></td></tr></table></div><div class="qmldoc"><p>A gradient is defined by two or more colors, which are blended seamlessly. The colors are specified as a set of GradientStop child items, each of which defines a position on the gradient from 0.0 to 1.0 and a color. The position of each GradientStop is defined by setting the position property. The color is defined by setting the color property.</p>
<table class="generic">
<thead><tr class="qt-style"><th >Output examples with different gradient values</th><th ></th><th ></th></tr></thead>
<tr valign="top" class="odd"><td ><p class="centerAlign"><img src="images/RadialGradient_gradient1.png" alt="" /></p></td><td ><p class="centerAlign"><img src="images/RadialGradient_gradient2.png" alt="" /></p></td><td ><p class="centerAlign"><img src="images/RadialGradient_gradient3.png" alt="" /></p></td></tr>
<tr valign="top" class="even"><td ><b>gradient:</b><pre class="cpp">Gradient {
GradientStop { position: <span class="number">0.000</span>
color: <span class="type">Qt</span><span class="operator">.</span>rgba(<span class="number">1</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span>) }
GradientStop { position: <span class="number">0.167</span>;
color: <span class="type">Qt</span><span class="operator">.</span>rgba(<span class="number">1</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span>) }
GradientStop { position: <span class="number">0.333</span>;
color: <span class="type">Qt</span><span class="operator">.</span>rgba(<span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span>) }
GradientStop { position: <span class="number">0.500</span>;
color: <span class="type">Qt</span><span class="operator">.</span>rgba(<span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">1</span>) }
GradientStop { position: <span class="number">0.667</span>;
color: <span class="type">Qt</span><span class="operator">.</span>rgba(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">1</span>) }
GradientStop { position: <span class="number">0.833</span>;
color: <span class="type">Qt</span><span class="operator">.</span>rgba(<span class="number">1</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">1</span>) }
GradientStop { position: <span class="number">1.000</span>;
color: <span class="type">Qt</span><span class="operator">.</span>rgba(<span class="number">1</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span>) }
}</pre>
</td><td ><b>gradient:</b><pre class="cpp">Gradient {
GradientStop { position: <span class="number">0.0</span>
color: <span class="string">"#F0F0F0"</span>
}
GradientStop { position: <span class="number">0.5</span>
color: <span class="string">"#000000"</span>
}
GradientStop { position: <span class="number">1.0</span>
color: <span class="string">"#F0F0F0"</span>
}
}</pre>
</td><td ><b>gradient:</b><pre class="cpp">Gradient {
GradientStop { position: <span class="number">0.0</span>
color: <span class="string">"#00000000"</span>
}
GradientStop { position: <span class="number">1.0</span>
color: <span class="string">"#FF000000"</span>
}
}</pre>
</td></tr>
<tr valign="top" class="odd"><td ><a href="qml-qtgraphicaleffects-radialgradient.html#horizontalOffset-prop">horizontalOffset</a>: 0</td><td ><a href="qml-qtgraphicaleffects-radialgradient.html#horizontalOffset-prop">horizontalOffset</a>: 0</td><td ><a href="qml-qtgraphicaleffects-radialgradient.html#horizontalOffset-prop">horizontalOffset</a>: 0</td></tr>
<tr valign="top" class="even"><td ><a href="qml-qtgraphicaleffects-radialgradient.html#verticalOffset-prop">verticalOffset</a>: 0</td><td ><a href="qml-qtgraphicaleffects-radialgradient.html#verticalOffset-prop">verticalOffset</a>: 0</td><td ><a href="qml-qtgraphicaleffects-radialgradient.html#verticalOffset-prop">verticalOffset</a>: 0</td></tr>
<tr valign="top" class="odd"><td ><a href="qml-qtgraphicaleffects-radialgradient.html#horizontalRadius-prop">horizontalRadius</a>: 300</td><td ><a href="qml-qtgraphicaleffects-radialgradient.html#horizontalRadius-prop">horizontalRadius</a>: 300</td><td ><a href="qml-qtgraphicaleffects-radialgradient.html#horizontalRadius-prop">horizontalRadius</a>: 300</td></tr>
<tr valign="top" class="even"><td ><a href="qml-qtgraphicaleffects-radialgradient.html#verticalRadius-prop">verticalRadius</a>: 300</td><td ><a href="qml-qtgraphicaleffects-radialgradient.html#verticalRadius-prop">verticalRadius</a>: 300</td><td ><a href="qml-qtgraphicaleffects-radialgradient.html#verticalRadius-prop">verticalRadius</a>: 300</td></tr>
<tr valign="top" class="odd"><td ><a href="qml-qtgraphicaleffects-radialgradient.html#angle-prop">angle</a>: 0</td><td ><a href="qml-qtgraphicaleffects-radialgradient.html#angle-prop">angle</a>: 0</td><td ><a href="qml-qtgraphicaleffects-radialgradient.html#angle-prop">angle</a>: 0</td></tr>
</table>
</div></div><!-- @@@gradient -->
<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>The HorizontalOffset and <a href="qml-qtgraphicaleffects-radialgradient.html#verticalOffset-prop">verticalOffset</a> properties define the offset in pixels for the center point of the gradient compared to the item center.</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/RadialGradient_horizontalOffset1.png" alt="" /></p></td><td ><p class="centerAlign"><img src="images/RadialGradient_horizontalOffset2.png" alt="" /></p></td><td ><p class="centerAlign"><img src="images/RadialGradient_horizontalOffset3.png" alt="" /></p></td></tr>
<tr valign="top" class="even"><td ><b> horizontalOffset: -150 </b></td><td ><b> horizontalOffset: 0 </b></td><td ><b> horizontalOffset: 150 </b></td></tr>
<tr valign="top" class="odd"><td ><a href="qml-qtgraphicaleffects-radialgradient.html#verticalOffset-prop">verticalOffset</a>: 0</td><td ><a href="qml-qtgraphicaleffects-radialgradient.html#verticalOffset-prop">verticalOffset</a>: 0</td><td ><a href="qml-qtgraphicaleffects-radialgradient.html#verticalOffset-prop">verticalOffset</a>: 0</td></tr>
<tr valign="top" class="even"><td ><a href="qml-qtgraphicaleffects-radialgradient.html#horizontalRadius-prop">horizontalRadius</a>: 300</td><td ><a href="qml-qtgraphicaleffects-radialgradient.html#horizontalRadius-prop">horizontalRadius</a>: 300</td><td ><a href="qml-qtgraphicaleffects-radialgradient.html#horizontalRadius-prop">horizontalRadius</a>: 300</td></tr>
<tr valign="top" class="odd"><td ><a href="qml-qtgraphicaleffects-radialgradient.html#verticalRadius-prop">verticalRadius</a>: 300</td><td ><a href="qml-qtgraphicaleffects-radialgradient.html#verticalRadius-prop">verticalRadius</a>: 300</td><td ><a href="qml-qtgraphicaleffects-radialgradient.html#verticalRadius-prop">verticalRadius</a>: 300</td></tr>
<tr valign="top" class="even"><td ><a href="qml-qtgraphicaleffects-radialgradient.html#angle-prop">angle</a>: 0</td><td ><a href="qml-qtgraphicaleffects-radialgradient.html#angle-prop">angle</a>: 0</td><td ><a href="qml-qtgraphicaleffects-radialgradient.html#angle-prop">angle</a>: 0</td></tr>
</table>
</div></div><!-- @@@horizontalOffset -->
<br/>
<!-- $$$horizontalRadius -->
<div class="qmlitem"><div class="qmlproto"><table class="qmlname"><tr valign="top" class="odd"><td class="tblQmlPropNode"><p><a name="horizontalRadius-prop"></a><span class="name">horizontalRadius</span> : <span class="type">real</span></p></td></tr></table></div><div class="qmldoc"><p>The HorizontalRadius and <a href="qml-qtgraphicaleffects-radialgradient.html#verticalRadius-prop">verticalRadius</a> properties define the shape and size of the radial gradient. If the radiuses are equal, the shape of the gradient is a circle. If the horizontal and vertical radiuses differ, the shape is elliptical. The radiuses are given in pixels.</p>
<p>The value ranges from -inf to inf. By default, horizontalRadius is bound to width and <a href="qml-qtgraphicaleffects-radialgradient.html#verticalRadius-prop">verticalRadius</a> is bound to height.</p>
<table class="generic">
<thead><tr class="qt-style"><th >Output examples with different horizontalRadius values</th><th ></th><th ></th></tr></thead>
<tr valign="top" class="odd"><td ><p class="centerAlign"><img src="images/RadialGradient_horizontalRadius1.png" alt="" /></p></td><td ><p class="centerAlign"><img src="images/RadialGradient_horizontalRadius2.png" alt="" /></p></td></tr>
<tr valign="top" class="even"><td ><b> horizontalRadius: 300 </b></td><td ><b> horizontalRadius: 100 </b></td></tr>
<tr valign="top" class="odd"><td ><a href="qml-qtgraphicaleffects-radialgradient.html#horizontalOffset-prop">horizontalOffset</a>: 0</td><td ><a href="qml-qtgraphicaleffects-radialgradient.html#horizontalOffset-prop">horizontalOffset</a>: 0</td></tr>
<tr valign="top" class="even"><td ><a href="qml-qtgraphicaleffects-radialgradient.html#verticalOffset-prop">verticalOffset</a>: 0</td><td ><a href="qml-qtgraphicaleffects-radialgradient.html#verticalOffset-prop">verticalOffset</a>: 0</td></tr>
<tr valign="top" class="odd"><td ><a href="qml-qtgraphicaleffects-radialgradient.html#verticalRadius-prop">verticalRadius</a>: 300</td><td ><a href="qml-qtgraphicaleffects-radialgradient.html#verticalRadius-prop">verticalRadius</a>: 300</td></tr>
<tr valign="top" class="even"><td ><a href="qml-qtgraphicaleffects-radialgradient.html#angle-prop">angle</a>: 0</td><td ><a href="qml-qtgraphicaleffects-radialgradient.html#angle-prop">angle</a>: 0</td></tr>
<tr valign="top" class="odd"><td ><a href="qml-qtgraphicaleffects-radialgradient.html#gradient-prop">gradient</a>: QQuickGradient(0xa05fb10)</td><td ><a href="qml-qtgraphicaleffects-radialgradient.html#gradient-prop">gradient</a>: QQuickGradient(0xa05fb10)</td></tr>
</table>
</div></div><!-- @@@horizontalRadius -->
<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 item that is going to be filled with gradient. Source item gets rendered into an intermediate pixel buffer and the alpha values from the result are used to determine the gradient's pixels visibility in the display. The default value for source is undefined and in that case whole effect area is filled with gradient.</p>
<table class="generic">
<thead><tr class="qt-style"><th >Output examples with different source values</th><th ></th><th ></th></tr></thead>
<tr valign="top" class="odd"><td ><p class="centerAlign"><img src="images/RadialGradient_maskSource1.png" alt="" /></p></td><td ><p class="centerAlign"><img src="images/RadialGradient_maskSource2.png" alt="" /></p></td></tr>
<tr valign="top" class="even"><td ><b> source: undefined </b></td><td ><b> source: Image { source: images/butterfly.png } </b></td></tr>
<tr valign="top" class="odd"><td ><a href="qml-qtgraphicaleffects-radialgradient.html#horizontalOffset-prop">horizontalOffset</a>: 0</td><td ><a href="qml-qtgraphicaleffects-radialgradient.html#horizontalOffset-prop">horizontalOffset</a>: 0</td></tr>
<tr valign="top" class="even"><td ><a href="qml-qtgraphicaleffects-radialgradient.html#verticalOffset-prop">verticalOffset</a>: 0</td><td ><a href="qml-qtgraphicaleffects-radialgradient.html#verticalOffset-prop">verticalOffset</a>: 0</td></tr>
<tr valign="top" class="odd"><td ><a href="qml-qtgraphicaleffects-radialgradient.html#horizontalRadius-prop">horizontalRadius</a>: 300</td><td ><a href="qml-qtgraphicaleffects-radialgradient.html#horizontalRadius-prop">horizontalRadius</a>: 300</td></tr>
<tr valign="top" class="even"><td ><a href="qml-qtgraphicaleffects-radialgradient.html#verticalRadius-prop">verticalRadius</a>: 300</td><td ><a href="qml-qtgraphicaleffects-radialgradient.html#verticalRadius-prop">verticalRadius</a>: 300</td></tr>
<tr valign="top" class="odd"><td ><a href="qml-qtgraphicaleffects-radialgradient.html#angle-prop">angle</a>: 0</td><td ><a href="qml-qtgraphicaleffects-radialgradient.html#angle-prop">angle</a>: 0</td></tr>
</table>
<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/>
<!-- $$$verticalOffset -->
<div class="qmlitem"><div class="qmlproto"><table class="qmlname"><tr valign="top" class="odd"><td class="tblQmlPropNode"><p><a name="verticalOffset-prop"></a><span class="name">verticalOffset</span> : <span class="type">real</span></p></td></tr></table></div><div class="qmldoc"></div></div><!-- @@@verticalOffset -->
<br/>
<!-- $$$verticalRadius -->
<div class="qmlitem"><div class="qmlproto"><table class="qmlname"><tr valign="top" class="odd"><td class="tblQmlPropNode"><p><a name="verticalRadius-prop"></a><span class="name">verticalRadius</span> : <span class="type">real</span></p></td></tr></table></div><div class="qmldoc"></div></div><!-- @@@verticalRadius -->
<br/>
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