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  <title>Qt 4.8: QGraphicsRotation Class Reference</title>
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    <a href="index.html" class="qtref"><span>Qt Reference Documentation</span></a>
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<div class="content mainContent">
<div class="toc">
<h3><a name="toc">Contents</a></h3>
<ul>
<li class="level1"><a href="#properties">Properties</a></li>
<li class="level1"><a href="#public-functions">Public Functions</a></li>
<li class="level1"><a href="#signals">Signals</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
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</div>
<h1 class="title">QGraphicsRotation Class Reference</h1>
<!-- $$$QGraphicsRotation-brief -->
<p>The QGraphicsRotation class provides a rotation transformation around a given axis. <a href="#details">More...</a></p>
<!-- @@@QGraphicsRotation -->
<pre class="cpp"> <span class="preprocessor">#include &lt;QGraphicsRotation&gt;</span></pre><p><b>Inherits: </b><a href="qgraphicstransform.html">QGraphicsTransform</a>.</p>
<p>This class was introduced in Qt 4.6.</p>
<ul>
<li><a href="qgraphicsrotation-members.html">List of all members, including inherited members</a></li>
</ul>
<a name="properties"></a>
<h2>Properties</h2>
<ul>
<li class="fn"><b><a href="qgraphicsrotation.html#angle-prop">angle</a></b> : qreal</li>
<li class="fn"><b><a href="qgraphicsrotation.html#axis-prop">axis</a></b> : QVector3D</li>
<li class="fn"><b><a href="qgraphicsrotation.html#origin-prop">origin</a></b> : QVector3D</li>
</ul>
<ul>
<li class="fn">1 property inherited from <a href="qobject.html#properties">QObject</a></li>
</ul>
<a name="public-functions"></a>
<h2>Public Functions</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsrotation.html#QGraphicsRotation">QGraphicsRotation</a></b> ( QObject * <i>parent</i> = 0 )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsrotation.html#dtor.QGraphicsRotation">~QGraphicsRotation</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> qreal </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsrotation.html#angle-prop">angle</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QVector3D </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsrotation.html#axis-prop">axis</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QVector3D </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsrotation.html#origin-prop">origin</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsrotation.html#angle-prop">setAngle</a></b> ( qreal )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsrotation.html#axis-prop">setAxis</a></b> ( const QVector3D &amp; <i>axis</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsrotation.html#axis-prop">setAxis</a></b> ( Qt::Axis <i>axis</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsrotation.html#origin-prop">setOrigin</a></b> ( const QVector3D &amp; <i>point</i> )</td></tr>
</table>
<a name="reimplemented-public-functions"></a>
<h2>Reimplemented Public Functions</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsrotation.html#applyTo">applyTo</a></b> ( QMatrix4x4 * <i>matrix</i> ) const</td></tr>
</table>
<ul>
<li class="fn">1 public function inherited from <a href="qgraphicstransform.html#public-functions">QGraphicsTransform</a></li>
<li class="fn">29 public functions inherited from <a href="qobject.html#public-functions">QObject</a></li>
</ul>
<a name="signals"></a>
<h2>Signals</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsrotation.html#angleChanged">angleChanged</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsrotation.html#axisChanged">axisChanged</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsrotation.html#originChanged">originChanged</a></b> ()</td></tr>
</table>
<ul>
<li class="fn">1 signal inherited from <a href="qobject.html#signals">QObject</a></li>
</ul>
<h3>Additional Inherited Members</h3>
<ul>
<li class="fn">1 public slot inherited from <a href="qobject.html#public-slots">QObject</a></li>
<li class="fn">7 static public members inherited from <a href="qobject.html#static-public-members">QObject</a></li>
<li class="fn">8 protected functions inherited from <a href="qobject.html#protected-functions">QObject</a></li>
<li class="fn">1 protected slot inherited from <a href="qgraphicstransform.html#protected-slots">QGraphicsTransform</a></li>
</ul>
<a name="details"></a>
<!-- $$$QGraphicsRotation-description -->
<div class="descr">
<h2>Detailed Description</h2>
<p>The QGraphicsRotation class provides a rotation transformation around a given axis.</p>
<p>You can provide the desired axis by assigning a <a href="qvector3d.html">QVector3D</a> to the axis property or by passing a member if <a href="qt.html#Axis-enum">Qt::Axis</a> to the setAxis convenience function. By default the axis is (0, 0, 1) i.e&#x2e;, rotation around the Z axis.</p>
<p>The angle property, which is provided by QGraphicsRotation, now describes the number of degrees to rotate around this axis.</p>
<p>QGraphicsRotation provides certain parameters to help control how the rotation should be applied.</p>
<p>The origin is the point that the item is rotated around (i.e&#x2e;, it stays fixed relative to the parent as the rest of the item is rotated). By default the origin is <a href="qpointf.html">QPointF</a>(0, 0).</p>
<p>The angle property provides the number of degrees to rotate the item clockwise around the origin. This value also be negative, indicating a counter-clockwise rotation. For animation purposes it may also be useful to provide rotation angles exceeding (-360, 360) degrees, for instance to animate how an item rotates several times.</p>
<p>Note: the final rotation is the combined effect of a rotation in 3D space followed by a projection back to 2D. If several rotations are performed in succession, they will not behave as expected unless they were all around the Z axis.</p>
</div>
<p><b>See also </b><a href="qgraphicstransform.html">QGraphicsTransform</a>, <a href="qgraphicsitem.html#setRotation">QGraphicsItem::setRotation</a>(), and <a href="qtransform.html#rotate">QTransform::rotate</a>().</p>
<!-- @@@QGraphicsRotation -->
<div class="prop">
<h2>Property Documentation</h2>
<!-- $$$angle-prop$$$angle$$$setAngleqreal$$$angleChanged -->
<h3 class="fn"><a name="angle-prop"></a><span class="name">angle</span> : <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span></h3>
<p>This property holds the angle for clockwise rotation, in degrees.</p>
<p>The angle can be any real number; the default value is 0.0&#x2e; A value of 180 will rotate 180 degrees, clockwise. If you provide a negative number, the item will be rotated counter-clockwise. Normally the rotation angle will be in the range (-360, 360), but you can also provide numbers outside of this range (e.g&#x2e;, a angle of 370 degrees gives the same result as 10 degrees). Setting the angle to NaN results in no rotation.</p>
<p><b>Access functions:</b></p>
<table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> qreal </td><td class="memItemRight bottomAlign"><span class="name"><b>angle</b></span> () const</td></tr>
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b>setAngle</b></span> ( qreal )</td></tr>
</table>
<p><b>Notifier signal:</b></p>
<table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b><a href="qgraphicsrotation.html#angleChanged">angleChanged</a></b></span> ()</td></tr>
</table>
<p><b>See also </b><a href="qgraphicsrotation.html#origin-prop">origin</a>.</p>
<!-- @@@angle -->
<!-- $$$axis-prop$$$axis$$$setAxisconstQVector3D&$$$setAxisQt::Axis$$$axisChanged -->
<h3 class="fn"><a name="axis-prop"></a><span class="name">axis</span> : <span class="type"><a href="qvector3d.html">QVector3D</a></span></h3>
<p>This property holds a rotation axis, specified by a vector in 3D space.</p>
<p>This can be any axis in 3D space. By default the axis is (0, 0, 1), which is aligned with the Z axis. If you provide another axis, <a href="qgraphicsrotation.html">QGraphicsRotation</a> will provide a transformation that rotates around this axis. For example, if you would like to rotate an item around its X axis, you could pass (1, 0, 0) as the axis.</p>
<p><b>Access functions:</b></p>
<table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> QVector3D </td><td class="memItemRight bottomAlign"><span class="name"><b>axis</b></span> () const</td></tr>
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b>setAxis</b></span> ( const QVector3D &amp; <i>axis</i> )</td></tr>
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b>setAxis</b></span> ( Qt::Axis <i>axis</i> )</td></tr>
</table>
<p><b>Notifier signal:</b></p>
<table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b><a href="qgraphicsrotation.html#axisChanged">axisChanged</a></b></span> ()</td></tr>
</table>
<p><b>See also </b><a href="qtransform.html">QTransform</a> and <a href="qgraphicsrotation.html#angle-prop">QGraphicsRotation::angle</a>.</p>
<!-- @@@axis -->
<!-- $$$origin-prop$$$origin$$$setOriginconstQVector3D&$$$originChanged -->
<h3 class="fn"><a name="origin-prop"></a><span class="name">origin</span> : <span class="type"><a href="qvector3d.html">QVector3D</a></span></h3>
<p>This property holds the origin of the rotation in 3D space.</p>
<p>All rotations will be done relative to this point (i.e&#x2e;, this point will stay fixed, relative to the parent, when the item is rotated).</p>
<p><b>Access functions:</b></p>
<table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> QVector3D </td><td class="memItemRight bottomAlign"><span class="name"><b>origin</b></span> () const</td></tr>
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b>setOrigin</b></span> ( const QVector3D &amp; <i>point</i> )</td></tr>
</table>
<p><b>Notifier signal:</b></p>
<table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b><a href="qgraphicsrotation.html#originChanged">originChanged</a></b></span> ()</td></tr>
</table>
<p><b>See also </b><a href="qgraphicsrotation.html#angle-prop">angle</a>.</p>
<!-- @@@origin -->
</div>
<div class="func">
<h2>Member Function Documentation</h2>
<!-- $$$QGraphicsRotation[overload1]$$$QGraphicsRotationQObject* -->
<h3 class="fn"><a name="QGraphicsRotation"></a>QGraphicsRotation::<span class="name">QGraphicsRotation</span> ( <span class="type"><a href="qobject.html">QObject</a></span> * <i>parent</i> = 0 )</h3>
<p>Constructs a new <a href="qgraphicsrotation.html">QGraphicsRotation</a> with the given <i>parent</i>.</p>
<!-- @@@QGraphicsRotation -->
<!-- $$$~QGraphicsRotation[overload1]$$$~QGraphicsRotation -->
<h3 class="fn"><a name="dtor.QGraphicsRotation"></a>QGraphicsRotation::<span class="name">~QGraphicsRotation</span> ()</h3>
<p>Destroys the graphics rotation.</p>
<!-- @@@~QGraphicsRotation -->
<!-- $$$angleChanged[overload1]$$$angleChanged -->
<h3 class="fn"><a name="angleChanged"></a><span class="type">void</span> QGraphicsRotation::<span class="name">angleChanged</span> ()<tt> [signal]</tt></h3>
<p>This signal is emitted whenever the angle has changed.</p>
<p><b>See also </b><a href="qgraphicsrotation.html#angle-prop">QGraphicsRotation::angle</a>.</p>
<!-- @@@angleChanged -->
<!-- $$$applyTo[overload1]$$$applyToQMatrix4x4* -->
<h3 class="fn"><a name="applyTo"></a><span class="type">void</span> QGraphicsRotation::<span class="name">applyTo</span> ( <span class="type"><a href="qmatrix4x4.html">QMatrix4x4</a></span> * <i>matrix</i> ) const<tt> [virtual]</tt></h3>
<p>Reimplemented from <a href="qgraphicstransform.html#applyTo">QGraphicsTransform::applyTo</a>().</p>
<!-- @@@applyTo -->
<!-- $$$axisChanged[overload1]$$$axisChanged -->
<h3 class="fn"><a name="axisChanged"></a><span class="type">void</span> QGraphicsRotation::<span class="name">axisChanged</span> ()<tt> [signal]</tt></h3>
<p>This signal is emitted whenever the axis of the object changes.</p>
<p><b>See also </b><a href="qgraphicsrotation.html#axis-prop">QGraphicsRotation::axis</a>.</p>
<!-- @@@axisChanged -->
<!-- $$$originChanged[overload1]$$$originChanged -->
<h3 class="fn"><a name="originChanged"></a><span class="type">void</span> QGraphicsRotation::<span class="name">originChanged</span> ()<tt> [signal]</tt></h3>
<p>This signal is emitted whenever the origin has changed.</p>
<p><b>See also </b><a href="qgraphicsrotation.html#origin-prop">QGraphicsRotation::origin</a>.</p>
<!-- @@@originChanged -->
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