<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<!-- qquicktranslate.cpp -->
<title>Rotation QML Type | Qt Quick 5.9</title>
<link rel="stylesheet" type="text/css" href="style/offline-simple.css" />
<script type="text/javascript">
document.getElementsByTagName("link").item(0).setAttribute("href", "style/offline.css");
// loading style sheet breaks anchors that were jumped to before
// so force jumping to anchor again
setTimeout(function() {
var anchor = location.hash;
// need to jump to different anchor first (e.g. none)
location.hash = "#";
setTimeout(function() {
location.hash = anchor;
}, 0);
}, 0);
</script>
</head>
<body>
<div class="header" id="qtdocheader">
<div class="main">
<div class="main-rounded">
<div class="navigationbar">
<table><tr>
<td >Qt 5.9</td><td ><a href="qtquick-index.html">Qt Quick</a></td><td ><a href="qtquick-qmlmodule.html">QML Types</a></td><td >Rotation QML Type</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right">Qt 5.9.4 Reference Documentation</td>
</tr></table>
</div>
</div>
<div class="content">
<div class="line">
<div class="content mainContent">
<div class="sidebar">
<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="#details">Detailed Description</a></li>
</ul>
</div>
<div class="sidebar-content" id="sidebar-content"></div></div>
<h1 class="title">Rotation QML Type</h1>
<span class="subtitle"></span>
<!-- $$$Rotation-brief -->
<p>Provides a way to rotate an Item <a href="#details">More...</a></p>
<!-- @@@Rotation -->
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> Import Statement:</td><td class="memItemRight bottomAlign"> import QtQuick 2.7</td></tr></table></div><ul>
<li><a href="qml-qtquick-rotation-members.html">List of all members, including inherited members</a></li>
</ul>
<a name="properties"></a>
<h2 id="properties">Properties</h2>
<ul>
<li class="fn"><b><b><a href="qml-qtquick-rotation.html#angle-prop">angle</a></b></b> : real</li>
<li class="fn"><b><b><a href="qml-qtquick-rotation.html#axis-prop">axis</a></b></b><ul>
<li class="fn"><b><b><a href="qml-qtquick-rotation.html#axis.x-prop">axis.x</a></b></b> : real</li>
<li class="fn"><b><b><a href="qml-qtquick-rotation.html#axis.y-prop">axis.y</a></b></b> : real</li>
<li class="fn"><b><b><a href="qml-qtquick-rotation.html#axis.z-prop">axis.z</a></b></b> : real</li>
</ul>
</li>
<li class="fn"><b><b><a href="qml-qtquick-rotation.html#origin-prop">origin</a></b></b><ul>
<li class="fn"><b><b><a href="qml-qtquick-rotation.html#origin.x-prop">origin.x</a></b></b> : real</li>
<li class="fn"><b><b><a href="qml-qtquick-rotation.html#origin.y-prop">origin.y</a></b></b> : real</li>
</ul>
</li>
</ul>
<!-- $$$Rotation-description -->
<a name="details"></a>
<h2 id="details">Detailed Description</h2>
<p>The Rotation type provides a way to rotate an <a href="qml-qtquick-item.html">Item</a> through a rotation-type transform.</p>
<p>It allows (z axis) rotation to be relative to an arbitrary point, and also provides a way to specify 3D-like rotations for Items. This gives more control over item rotation than the <a href="qml-qtquick-item.html#rotation-prop">rotation</a> property.</p>
<p>The following example rotates a Rectangle around its interior point (25, 25):</p>
<pre class="qml">
<span class="type"><a href="qml-qtquick-rectangle.html">Rectangle</a></span> {
<span class="name">width</span>: <span class="number">100</span>; <span class="name">height</span>: <span class="number">100</span>
<span class="name">color</span>: <span class="string">"blue"</span>
<span class="name">transform</span>: <span class="name">Rotation</span> { <span class="name">origin</span>.x: <span class="number">25</span>; <span class="name">origin</span>.y: <span class="number">25</span>; <span class="name">angle</span>: <span class="number">45</span>}
}
</pre>
<p>For 3D-like item rotations, you must specify the axis of rotation in addition to the origin point. The following example shows various 3D-like rotations applied to an <a href="qtquick-imageelements-example.html#image">Image</a>.</p>
<pre class="qml">
import QtQuick 2.0
<span class="type"><a href="qml-qtquick-row.html">Row</a></span> {
<span class="name">x</span>: <span class="number">10</span>; <span class="name">y</span>: <span class="number">10</span>
<span class="name">spacing</span>: <span class="number">10</span>
<span class="type"><a href="qml-qtquick-image.html">Image</a></span> { <span class="name">source</span>: <span class="string">"pics/qt.png"</span> }
<span class="type"><a href="qml-qtquick-image.html">Image</a></span> {
<span class="name">source</span>: <span class="string">"pics/qt.png"</span>
<span class="name">transform</span>: <span class="name">Rotation</span> { <span class="name">origin</span>.x: <span class="number">30</span>; <span class="name">origin</span>.y: <span class="number">30</span>; <span class="type">axis</span> { <span class="name">x</span>: <span class="number">0</span>; <span class="name">y</span>: <span class="number">1</span>; <span class="name">z</span>: <span class="number">0</span> } <span class="name">angle</span>: <span class="number">18</span> }
}
<span class="type"><a href="qml-qtquick-image.html">Image</a></span> {
<span class="name">source</span>: <span class="string">"pics/qt.png"</span>
<span class="name">transform</span>: <span class="name">Rotation</span> { <span class="name">origin</span>.x: <span class="number">30</span>; <span class="name">origin</span>.y: <span class="number">30</span>; <span class="type">axis</span> { <span class="name">x</span>: <span class="number">0</span>; <span class="name">y</span>: <span class="number">1</span>; <span class="name">z</span>: <span class="number">0</span> } <span class="name">angle</span>: <span class="number">36</span> }
}
<span class="type"><a href="qml-qtquick-image.html">Image</a></span> {
<span class="name">source</span>: <span class="string">"pics/qt.png"</span>
<span class="name">transform</span>: <span class="name">Rotation</span> { <span class="name">origin</span>.x: <span class="number">30</span>; <span class="name">origin</span>.y: <span class="number">30</span>; <span class="type">axis</span> { <span class="name">x</span>: <span class="number">0</span>; <span class="name">y</span>: <span class="number">1</span>; <span class="name">z</span>: <span class="number">0</span> } <span class="name">angle</span>: <span class="number">54</span> }
}
<span class="type"><a href="qml-qtquick-image.html">Image</a></span> {
<span class="name">source</span>: <span class="string">"pics/qt.png"</span>
<span class="name">transform</span>: <span class="name">Rotation</span> { <span class="name">origin</span>.x: <span class="number">30</span>; <span class="name">origin</span>.y: <span class="number">30</span>; <span class="type">axis</span> { <span class="name">x</span>: <span class="number">0</span>; <span class="name">y</span>: <span class="number">1</span>; <span class="name">z</span>: <span class="number">0</span> } <span class="name">angle</span>: <span class="number">72</span> }
}
}
</pre>
<p class="centerAlign"><img src="images/axisrotation.png" alt="" /></p><p><b>See also </b><a href="qtquick-customitems-dialcontrol-example.html">Dial Control example</a> and <a href="qtquick-demos-clocks-example.html">Qt Quick Demo - Clocks</a>.</p>
<!-- @@@Rotation -->
<h2>Property Documentation</h2>
<!-- $$$angle -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="angle-prop">
<td class="tblQmlPropNode"><p>
<a name="angle-prop"></a><span class="name">angle</span> : <span class="type">real</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>The angle to rotate, in degrees clockwise.</p>
</div></div><!-- @@@angle -->
<br/>
<!-- $$$axis -->
<div class="qmlitem"><div class="qmlproto"><div class="table"><table class="qmlname"><tr valign="top" class="even" id="axis-prop"><th class="centerAlign"><p><a name="axis-prop"></a><b>axis group</b></p></th></tr><tr valign="top" class="odd" id="axis.x-prop"><td class="tblQmlPropNode"><p><a name="axis.x-prop"></a><span class="name">axis.x</span> : <span class="type">real</span></p></td></tr><tr valign="top" class="odd" id="axis.y-prop"><td class="tblQmlPropNode"><p><a name="axis.y-prop"></a><span class="name">axis.y</span> : <span class="type">real</span></p></td></tr><tr valign="top" class="odd" id="axis.z-prop"><td class="tblQmlPropNode"><p><a name="axis.z-prop"></a><span class="name">axis.z</span> : <span class="type">real</span></p></td></tr></table></div></div><div class="qmldoc"><p>The axis to rotate around. For simple (2D) rotation around a point, you do not need to specify an axis, as the default axis is the z axis (<code>axis { x: 0; y: 0; z: 1 }</code>).</p>
<p>For a typical 3D-like rotation you will usually specify both the origin and the axis.</p>
<p class="centerAlign"><img src="images/3d-rotation-axis.png" alt="" /></p></div></div><!-- @@@axis -->
<br/>
<!-- $$$origin -->
<div class="qmlitem"><div class="qmlproto"><div class="table"><table class="qmlname"><tr valign="top" class="even" id="origin-prop"><th class="centerAlign"><p><a name="origin-prop"></a><b>origin group</b></p></th></tr><tr valign="top" class="odd" id="origin.x-prop"><td class="tblQmlPropNode"><p><a name="origin.x-prop"></a><span class="name">origin.x</span> : <span class="type">real</span></p></td></tr><tr valign="top" class="odd" id="origin.y-prop"><td class="tblQmlPropNode"><p><a name="origin.y-prop"></a><span class="name">origin.y</span> : <span class="type">real</span></p></td></tr></table></div></div><div class="qmldoc"><p>The origin point of the rotation (i.e., the point that stays fixed relative to the parent as the rest of the item rotates). By default the origin is (0, 0).</p>
</div></div><!-- @@@origin -->
<br/>
</div>
</div>
</div>
</div>
</div>
<div class="footer">
<p>
<acronym title="Copyright">©</acronym> 2017 The Qt Company Ltd.
Documentation contributions included herein are the copyrights of
their respective owners.<br> The documentation provided herein is licensed under the terms of the <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation License version 1.3</a> as published by the Free Software Foundation.<br> Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property
of their respective owners. </p>
</div>
</body>
</html>
