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<td >Qt 5.12</td><td ><a href="qtwidgets-index.html">Qt Widgets</a></td><td ><a href="qtwidgets-module.html">C++ Classes</a></td><td >QGraphicsRotation</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right"><a href="qtwidgets-index.html">Qt 5.12.6 Reference Documentation</a></td>
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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="#public-functions">Public Functions</a></li>
<li class="level1"><a href="#reimplemented-public-functions">Reimplemented Public Functions</a></li>
<li class="level1"><a href="#signals">Signals</a></li>
<li class="level1"><a href="#static-public-members">Static Public Members</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
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<h1 class="title">QGraphicsRotation Class</h1>
<!-- $$$QGraphicsRotation-brief -->
<p>The <a href="qgraphicsrotation.html">QGraphicsRotation</a> class provides a rotation transformation around a given axis. <a href="#details">More...</a></p>
<!-- @@@QGraphicsRotation -->
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign"> <span class="preprocessor">#include <QGraphicsRotation></span>
</td></tr><tr><td class="memItemLeft rightAlign topAlign"> qmake:</td><td class="memItemRight bottomAlign"> QT += widgets</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Since:</td><td class="memItemRight bottomAlign"> Qt 4.6</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Inherits:</td><td class="memItemRight bottomAlign"> <a href="qgraphicstransform.html">QGraphicsTransform</a></td></tr></table></div><ul>
<li><a href="qgraphicsrotation-members.html">List of all members, including inherited members</a></li>
<li><a href="qgraphicsrotation-obsolete.html">Obsolete members</a></li>
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<a name="properties"></a>
<h2 id="properties">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="../qtcore/qobject.html#properties">QObject</a></li>
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<a name="public-functions"></a>
<h2 id="public-functions">Public Functions</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsrotation.html#QGraphicsRotation">QGraphicsRotation</a></b>(QObject *<i>parent</i> = nullptr)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual </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>(<i>qreal</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>(const QVector3D &<i>axis</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsrotation.html#setAxis-1">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 &<i>point</i>)</td></tr>
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<a name="reimplemented-public-functions"></a>
<h2 id="reimplemented-public-functions">Reimplemented Public Functions</h2>
<div class="table"><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 override</td></tr>
</table></div>
<ul>
<li class="fn">1 public function inherited from <a href="qgraphicstransform.html#public-functions">QGraphicsTransform</a></li>
<li class="fn">31 public functions inherited from <a href="../qtcore/qobject.html#public-functions">QObject</a></li>
</ul>
<a name="signals"></a>
<h2 id="signals">Signals</h2>
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<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>
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<li class="fn">2 signals inherited from <a href="../qtcore/qobject.html#signals">QObject</a></li>
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<a name="static-public-members"></a>
<h2 id="static-public-members">Static Public Members</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> const QMetaObject </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsrotation.html#staticMetaObject-var">staticMetaObject</a></b></td></tr>
</table></div>
<ul>
<li class="fn">9 static public members inherited from <a href="../qtcore/qobject.html#static-public-members">QObject</a></li>
</ul>
<h3>Additional Inherited Members</h3>
<ul>
<li class="fn">1 public slot inherited from <a href="../qtcore/qobject.html#public-slots">QObject</a></li>
<li class="fn">9 protected functions inherited from <a href="../qtcore/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 id="details">Detailed Description</h2>
<p>The <a href="qgraphicsrotation.html">QGraphicsRotation</a> class provides a rotation transformation around a given axis.</p>
<p>You can provide the desired axis by assigning a <a href="../qtgui/qvector3d.html">QVector3D</a> to the axis property or by passing a member if <a href="../qtcore/qt.html#Axis-enum">Qt::Axis</a> to the <a href="qgraphicsrotation.html#axis-prop">setAxis</a> convenience function. By default the axis is (0, 0, 1) i.e., rotation around the Z axis.</p>
<p>The angle property, which is provided by <a href="qgraphicsrotation.html">QGraphicsRotation</a>, now describes the number of degrees to rotate around this axis.</p>
<p><a href="qgraphicsrotation.html">QGraphicsRotation</a> 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., it stays fixed relative to the parent as the rest of the item is rotated). By default the origin is <a href="../qtcore/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="../qtgui/qtransform.html#rotate">QTransform::rotate</a>().</p>
<!-- @@@QGraphicsRotation -->
<div class="prop">
<h2>Property Documentation</h2>
<!-- $$$angle-prop$$$angle$$$setAngleqreal$$$angleChanged -->
<h3 class="fn" id="angle-prop"><a name="angle-prop"></a><span class="name">angle</span> : <span class="type"><a href="../qtcore/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. 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., 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>
<div class="table"><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>(<i>qreal</i>)</td></tr>
</table></div>
<p><b>Notifier signal:</b></p>
<div class="table"><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></div>
<p><b>See also </b><a href="stylesheet-reference.html#origin">origin</a>.</p>
<!-- @@@angle -->
<!-- $$$axis-prop$$$axis$$$setAxisconstQVector3D&$$$setAxisQt::Axis$$$axisChanged -->
<h3 class="fn" id="axis-prop"><a name="axis-prop"></a><span class="name">axis</span> : <span class="type"><a href="../qtgui/qvector3d.html">QVector3D</a></span></h3>
<p>This property holds a rotation axis, specified by a vector in 3D space.</p>
<p>This can be any axis in 3D space. By default the axis is (0, 0, 1), which is aligned with the Z axis. If you provide another axis, <a href="qgraphicsrotation.html">QGraphicsRotation</a> will provide a transformation that rotates around this axis. For example, if you would like to rotate an item around its X axis, you could pass (1, 0, 0) as the axis.</p>
<p><b>Access functions:</b></p>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> QVector3D </td><td class="memItemRight bottomAlign"><span class="name"><b>axis</b></span>() const</td></tr>
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b>setAxis</b></span>(const QVector3D &<i>axis</i>)</td></tr>
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b><a href="qgraphicsrotation.html#setAxis-1">setAxis</a></b></span>(Qt::Axis <i>axis</i>)</td></tr>
</table></div>
<p><b>Notifier signal:</b></p>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b><a href="qgraphicsrotation.html#axisChanged">axisChanged</a></b></span>()</td></tr>
</table></div>
<p><b>See also </b><a href="../qtgui/qtransform.html">QTransform</a> and <a href="qgraphicsrotation.html#angle-prop">QGraphicsRotation::angle</a>.</p>
<!-- @@@axis -->
<!-- $$$origin-prop$$$origin$$$setOriginconstQVector3D&$$$originChanged -->
<h3 class="fn" id="origin-prop"><a name="origin-prop"></a><span class="name">origin</span> : <span class="type"><a href="../qtgui/qvector3d.html">QVector3D</a></span></h3>
<p>This property holds the origin of the rotation in 3D space.</p>
<p>All rotations will be done relative to this point (i.e., this point will stay fixed, relative to the parent, when the item is rotated).</p>
<p><b>Access functions:</b></p>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> QVector3D </td><td class="memItemRight bottomAlign"><span class="name"><b>origin</b></span>() const</td></tr>
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b>setOrigin</b></span>(const QVector3D &<i>point</i>)</td></tr>
</table></div>
<p><b>Notifier signal:</b></p>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b><a href="qgraphicsrotation.html#originChanged">originChanged</a></b></span>()</td></tr>
</table></div>
<p><b>See also </b><a href="qgraphicsrotation.html#angle-prop">angle</a>.</p>
<!-- @@@origin -->
</div>
<div class="func">
<h2>Member Function Documentation</h2>
<!-- $$$QGraphicsRotation[overload1]$$$QGraphicsRotationQObject* -->
<h3 class="fn" id="QGraphicsRotation"><a name="QGraphicsRotation"></a>QGraphicsRotation::<span class="name">QGraphicsRotation</span>(<span class="type"><a href="../qtcore/qobject.html#QObject">QObject</a></span> *<i>parent</i> = nullptr)</h3>
<p>Constructs a new <a href="qgraphicsrotation.html">QGraphicsRotation</a> with the given <i>parent</i>.</p>
<!-- @@@QGraphicsRotation -->
<!-- $$$~QGraphicsRotation[overload1]$$$~QGraphicsRotation -->
<h3 class="fn" id="dtor.QGraphicsRotation"><a name="dtor.QGraphicsRotation"></a><code>[virtual] </code>QGraphicsRotation::<span class="name">~QGraphicsRotation</span>()</h3>
<p>Destroys the graphics rotation.</p>
<!-- @@@~QGraphicsRotation -->
<!-- $$$angleChanged -->
<h3 class="fn" id="angleChanged"><a name="angleChanged"></a><code>[signal] </code><span class="type">void</span> QGraphicsRotation::<span class="name">angleChanged</span>()</h3>
<p>This signal is emitted whenever the angle has changed.</p>
<p><b>Note:</b> Notifier signal for property <a href="qgraphicsrotation.html#angle-prop">angle</a>. </p><p><b>See also </b><a href="qgraphicsrotation.html#angle-prop">QGraphicsRotation::angle</a>.</p>
<!-- @@@angleChanged -->
<!-- $$$applyTo[overload1]$$$applyToQMatrix4x4* -->
<h3 class="fn" id="applyTo"><a name="applyTo"></a><code>[override virtual] </code><span class="type">void</span> QGraphicsRotation::<span class="name">applyTo</span>(<span class="type"><a href="../qtgui/qmatrix4x4.html">QMatrix4x4</a></span> *<i>matrix</i>) const</h3>
<p>Reimplemented from <a href="qgraphicstransform.html#applyTo">QGraphicsTransform::applyTo</a>().</p>
<!-- @@@applyTo -->
<!-- $$$axisChanged -->
<h3 class="fn" id="axisChanged"><a name="axisChanged"></a><code>[signal] </code><span class="type">void</span> QGraphicsRotation::<span class="name">axisChanged</span>()</h3>
<p>This signal is emitted whenever the axis of the object changes.</p>
<p><b>Note:</b> Notifier signal for property <a href="qgraphicsrotation.html#axis-prop">axis</a>. </p><p><b>See also </b><a href="qgraphicsrotation.html#axis-prop">QGraphicsRotation::axis</a>.</p>
<!-- @@@axisChanged -->
<!-- $$$originChanged -->
<h3 class="fn" id="originChanged"><a name="originChanged"></a><code>[signal] </code><span class="type">void</span> QGraphicsRotation::<span class="name">originChanged</span>()</h3>
<p>This signal is emitted whenever the origin has changed.</p>
<p><b>Note:</b> Notifier signal for property <a href="qgraphicsrotation.html#origin-prop">origin</a>. </p><p><b>See also </b><a href="qgraphicsrotation.html#origin-prop">QGraphicsRotation::origin</a>.</p>
<!-- @@@originChanged -->
<!-- $$$setAxis -->
<h3 class="fn" id="setAxis-1"><a name="setAxis-1"></a><span class="type">void</span> QGraphicsRotation::<span class="name">setAxis</span>(<span class="type"><a href="../qtcore/qt.html#Axis-enum">Qt::Axis</a></span> <i>axis</i>)</h3>
<p>Convenience function to set the axis to <i>axis</i>.</p>
<p>Note: the <a href="../qtcore/qt.html#Axis-enum">Qt::YAxis</a> rotation for <a href="../qtgui/qtransform.html">QTransform</a> is inverted from the correct mathematical rotation in 3D space. The <a href="qgraphicsrotation.html">QGraphicsRotation</a> class implements a correct mathematical rotation. The following two sequences of code will perform the same transformation:</p>
<pre class="cpp">
<span class="type"><a href="../qtgui/qtransform.html">QTransform</a></span> t;
t<span class="operator">.</span>rotate(<span class="number">45</span><span class="operator">,</span> <span class="type">Qt</span><span class="operator">::</span>YAxis);
<span class="type"><a href="qgraphicsrotation.html#QGraphicsRotation">QGraphicsRotation</a></span> r;
r<span class="operator">.</span>setAxis(<span class="type">Qt</span><span class="operator">::</span>YAxis);
r<span class="operator">.</span>setAngle(<span class="operator">-</span><span class="number">45</span>);
</pre>
<p><b>Note:</b> Setter function for property <a href="qgraphicsrotation.html#axis-prop">axis</a>. </p><!-- @@@setAxis -->
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