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<td >Qt 5.12</td><td ><a href="qtquick-index.html">Qt Quick</a></td><td ><a href="qtquick-qmlmodule.html">QML Types</a></td><td >RotationAnimation QML Type</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right"><a href="qtquick-index.html">Qt 5.12.6 Reference Documentation</a></td>
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<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>
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<h1 class="title">RotationAnimation QML Type</h1>
<span class="subtitle"></span>
<!-- $$$RotationAnimation-brief -->
<p>Animates changes in rotation values. <a href="#details">More...</a></p>
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<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> Import Statement:</td><td class="memItemRight bottomAlign"> import QtQuick 2.12</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Inherits:</td><td class="memItemRight bottomAlign"> <p><a href="qml-qtquick-propertyanimation.html">PropertyAnimation</a></p>
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<li><a href="qml-qtquick-rotationanimation-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-rotationanimation.html#direction-prop">direction</a></b></b> : enumeration</li>
<li class="fn"><b><b><a href="qml-qtquick-rotationanimation.html#from-prop">from</a></b></b> : real</li>
<li class="fn"><b><b><a href="qml-qtquick-rotationanimation.html#to-prop">to</a></b></b> : real</li>
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<a name="details"></a>
<h2 id="details">Detailed Description</h2>
<p><a href="qml-qtquick-rotationanimation.html">RotationAnimation</a> is a specialized <a href="qtquick-animation-example.html#propertyanimation">PropertyAnimation</a> that gives control over the direction of rotation during an animation.</p>
<p>By default, it rotates in the direction of the numerical change; a rotation from 0 to 240 will rotate 240 degrees clockwise, while a rotation from 240 to 0 will rotate 240 degrees counterclockwise. The <a href="qml-qtquick-rotationanimation.html#direction-prop">direction</a> property can be set to specify the direction in which the rotation should occur.</p>
<p>In the following example we use <a href="qml-qtquick-rotationanimation.html">RotationAnimation</a> to animate the rotation between states via the shortest path:</p>
<pre class="qml">
import QtQuick 2.0
Item {
width: 300; height: 300
Rectangle {
id: rect
width: 150; height: 100; anchors.centerIn: parent
color: "red"
antialiasing: true
states: State {
name: "rotated"
PropertyChanges { target: rect; rotation: 180 }
}
transitions: Transition {
RotationAnimation { duration: 1000; direction: RotationAnimation.Counterclockwise }
}
}
MouseArea { anchors.fill: parent; onClicked: rect.state = "rotated" }
}
</pre>
<p>Notice the <a href="qml-qtquick-rotationanimation.html">RotationAnimation</a> did not need to set a <code>target</code> value. As a convenience, when used in a transition, <a href="qml-qtquick-rotationanimation.html">RotationAnimation</a> will rotate all properties named "rotation" or "angle". You can override this by providing your own properties via <a href="qml-qtquick-propertyanimation.html#properties-prop">properties</a> or <a href="qml-qtquick-propertyanimation.html#property-prop">property</a>.</p>
<p>Also, note the <a href="qml-qtquick-rectangle.html">Rectangle</a> will be rotated around its default <a href="qml-qtquick-item.html#transformOrigin-prop">transformOrigin</a> (which is <code>Item.Center</code>). To use a different transform origin, set the origin in the <a href="qml-qtquick-propertychanges.html">PropertyChanges</a> object and apply the change at the start of the animation using <a href="qml-qtquick-propertyaction.html">PropertyAction</a>. See the <a href="qml-qtquick-propertyaction.html">PropertyAction</a> documentation for more details.</p>
<p>Like any other animation type, a <a href="qml-qtquick-rotationanimation.html">RotationAnimation</a> can be applied in a number of ways, including transitions, behaviors and property value sources. The <a href="qtquick-statesanimations-animations.html">Animation and Transitions in Qt Quick</a> documentation shows a variety of methods for creating animations.</p>
<p><b>See also </b><a href="qtquick-statesanimations-animations.html">Animation and Transitions in Qt Quick</a> and <a href="qtquick-animation-example.html">Qt Quick Examples - Animation</a>.</p>
<!-- @@@RotationAnimation -->
<h2>Property Documentation</h2>
<!-- $$$direction -->
<div class="qmlitem"><div class="qmlproto">
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<tr valign="top" class="odd" id="direction-prop">
<td class="tblQmlPropNode"><p>
<a name="direction-prop"></a><span class="name">direction</span> : <span class="type">enumeration</span></p></td></tr>
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</div><div class="qmldoc"><p>This property holds the direction of the rotation.</p>
<p>Possible values are:</p>
<ul>
<li><a href="qml-qtquick-rotationanimation.html">RotationAnimation</a>.Numerical (default) - Rotate by linearly interpolating between the two numbers. A rotation from 10 to 350 will rotate 340 degrees clockwise.</li>
<li><a href="qml-qtquick-rotationanimation.html">RotationAnimation</a>.Clockwise - Rotate clockwise between the two values</li>
<li><a href="qml-qtquick-rotationanimation.html">RotationAnimation</a>.Counterclockwise - Rotate counterclockwise between the two values</li>
<li><a href="qml-qtquick-rotationanimation.html">RotationAnimation</a>.Shortest - Rotate in the direction that produces the shortest animation path. A rotation from 10 to 350 will rotate 20 degrees counterclockwise.</li>
</ul>
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<br/>
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<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="from-prop">
<td class="tblQmlPropNode"><p>
<a name="from-prop"></a><span class="name">from</span> : <span class="type">real</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>This property holds the starting value for the animation.</p>
<p>For example, the following animation is not applied until the <code>angle</code> value has reached 100:</p>
<pre class="qml">
</pre>
<p>If the <a href="qml-qtquick-rotationanimation.html">RotationAnimation</a> is defined within a <a href="qmlexampletoggleswitch.html#transition">Transition</a> or <a href="qml-qtquick-behavior.html">Behavior</a>, this value defaults to the value defined in the starting state of the <a href="qmlexampletoggleswitch.html#transition">Transition</a>, or the current value of the property at the moment the <a href="qml-qtquick-behavior.html">Behavior</a> is triggered.</p>
<p><b>See also </b><a href="qtquick-statesanimations-animations.html">Animation and Transitions in Qt Quick</a>.</p>
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<br/>
<!-- $$$to -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="to-prop">
<td class="tblQmlPropNode"><p>
<a name="to-prop"></a><span class="name">to</span> : <span class="type">real</span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>This property holds the end value for the animation..</p>
<p>If the <a href="qml-qtquick-rotationanimation.html">RotationAnimation</a> is defined within a <a href="qmlexampletoggleswitch.html#transition">Transition</a> or <a href="qml-qtquick-behavior.html">Behavior</a>, this value defaults to the value defined in the end state of the <a href="qmlexampletoggleswitch.html#transition">Transition</a>, or the value of the property change that triggered the <a href="qml-qtquick-behavior.html">Behavior</a>.</p>
<p><b>See also </b><a href="qtquick-statesanimations-animations.html">Animation and Transitions in Qt Quick</a>.</p>
</div></div><!-- @@@to -->
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