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<?xml version="1.0" encoding="UTF-8"?>
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<!-- qdeclarativeanimation.cpp -->
<title>Qt 4.8: QML RotationAnimation Element</title>
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<a href="index.html" class="qtref"><span>Qt Reference Documentation</span></a>
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<li><a href="qdeclarativeelements.html">QML Elements</a></li>
<li>QML RotationAnimation Element</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>
</ul>
</div>
<h1 class="title">QML RotationAnimation Element</h1>
<span class="subtitle"></span>
<!-- $$$RotationAnimation-brief -->
<p>The RotationAnimation element animates changes in rotation values. <a href="#details">More...</a></p>
<!-- @@@RotationAnimation -->
<p>Inherits <a href="qml-propertyanimation.html">PropertyAnimation</a></p>
<p>This element was introduced in Qt 4.7.</p>
<ul>
<li><a href="qml-rotationanimation-members.html">List of all members, including inherited members</a></li>
</ul>
<a name="properties"></a>
<h2>Properties</h2>
<ul>
<li class="fn"><b><b><a href="qml-rotationanimation.html#direction-prop">direction</a></b></b> : enumeration</li>
<li class="fn"><b><b><a href="qml-rotationanimation.html#from-prop">from</a></b></b> : real</li>
<li class="fn"><b><b><a href="qml-rotationanimation.html#to-prop">to</a></b></b> : real</li>
</ul>
<!-- $$$RotationAnimation-description -->
<a name="details"></a>
<h2>Detailed Description</h2>
<p>RotationAnimation is a specialized <a href="qml-propertyanimation.html">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-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 RotationAnimation to animate the rotation between states via the shortest path:</p>
<pre class="qml"> import QtQuick 1.0
<span class="type"><a href="qml-item.html">Item</a></span> {
<span class="name">width</span>: <span class="number">300</span>; <span class="name">height</span>: <span class="number">300</span>
<span class="type"><a href="qml-rectangle.html">Rectangle</a></span> {
<span class="name">id</span>: <span class="name">rect</span>
<span class="name">width</span>: <span class="number">150</span>; <span class="name">height</span>: <span class="number">100</span>; <span class="name">anchors</span>.centerIn: <span class="name">parent</span>
<span class="name">color</span>: <span class="string">"red"</span>
<span class="name">smooth</span>: <span class="number">true</span>
<span class="name">states</span>: <span class="name">State</span> {
<span class="name">name</span>: <span class="string">"rotated"</span>
<span class="type"><a href="qml-propertychanges.html">PropertyChanges</a></span> { <span class="name">target</span>: <span class="name">rect</span>; <span class="name">rotation</span>: <span class="number">180</span> }
}
<span class="name">transitions</span>: <span class="name">Transition</span> {
<span class="type">RotationAnimation</span> { <span class="name">duration</span>: <span class="number">1000</span>; <span class="name">direction</span>: <span class="name">RotationAnimation</span>.<span class="name">Counterclockwise</span> }
}
}
<span class="type"><a href="qml-mousearea.html">MouseArea</a></span> { <span class="name">anchors</span>.fill: <span class="name">parent</span>; <span class="name">onClicked</span>: <span class="name">rect</span>.<span class="name">state</span> <span class="operator">=</span> <span class="string">"rotated"</span> }
}</pre>
<p>Notice the RotationAnimation did not need to set a <a href="qmake-variable-reference.html#target">target</a> value. As a convenience, when used in a transition, RotationAnimation will rotate all properties named "rotation" or "angle". You can override this by providing your own properties via <a href="qml-propertyanimation.html#properties-prop">properties</a> or <a href="qml-propertyanimation.html#property-prop">property</a>.</p>
<p>Also, note the <a href="qml-rectangle.html">Rectangle</a> will be rotated around its default <a href="qml-item.html#transformOrigin-prop">transformOrigin</a> (which is <tt>Item.Center</tt>). To use a different transform origin, set the origin in the <a href="qml-propertychanges.html">PropertyChanges</a> object and apply the change at the start of the animation using <a href="qml-propertyaction.html">PropertyAction</a>. See the <a href="qml-propertyaction.html">PropertyAction</a> documentation for more details.</p>
<p>Like any other animation element, a RotationAnimation can be applied in a number of ways, including transitions, behaviors and property value sources. The <a href="qdeclarativeanimation.html">QML Animation and Transitions</a> documentation shows a variety of methods for creating animations.</p>
<p><b>See also </b><a href="qdeclarativeanimation.html">QML Animation and Transitions</a> and Animation basics example.</p>
<!-- @@@RotationAnimation -->
<h2>Property Documentation</h2>
<!-- $$$direction -->
<div class="qmlitem"><div class="qmlproto"><table class="qmlname"><tr valign="top" class="odd"><td class="tblQmlPropNode"><p><a name="direction-prop"></a><span class="name">direction</span> : <span class="type"><a href="qml-enumeration.html">enumeration</a></span></p></td></tr></table></div><div class="qmldoc"><p>This property holds the direction of the rotation.</p>
<p>Possible values are:</p>
<ul>
<li><a href="qml-rotationanimation.html">RotationAnimation</a>.Numerical (default) - Rotate by linearly interpolating between the two numbers. A rotation from 10 to 350 will rotate 340 degrees clockwise.</li>
<li><a href="qml-rotationanimation.html">RotationAnimation</a>.Clockwise - Rotate clockwise between the two values</li>
<li><a href="qml-rotationanimation.html">RotationAnimation</a>.Counterclockwise - Rotate counterclockwise between the two values</li>
<li><a href="qml-rotationanimation.html">RotationAnimation</a>.Shortest - Rotate in the direction that produces the shortest animation path. A rotation from 10 to 350 will rotate 20 degrees counterclockwise.</li>
</ul>
</div></div><!-- @@@direction -->
<br/>
<!-- $$$from -->
<div class="qmlitem"><div class="qmlproto"><table class="qmlname"><tr valign="top" class="odd"><td class="tblQmlPropNode"><p><a name="from-prop"></a><span class="name">from</span> : <span class="type"><a href="qml-real.html">real</a></span></p></td></tr></table></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 <tt>angle</tt> value has reached 100:</p>
<pre class="qml"> <span class="type"><a href="qml-item.html">Item</a></span> {
<span class="name">states</span>: [
<span class="comment">// ...</span>
]
<span class="name">transition</span>: <span class="name">Transition</span> {
<span class="type"><a href="qml-rotationanimation.html">RotationAnimation</a></span> { <span class="name">properties</span>: <span class="string">"angle"</span>; <span class="name">from</span>: <span class="number">100</span>; <span class="name">duration</span>: <span class="number">2000</span> }
}
}</pre>
<p>If the <a href="qml-rotationanimation.html">RotationAnimation</a> is defined within a <a href="qml-transition.html">Transition</a> or <a href="qml-behavior.html">Behavior</a>, this value defaults to the value defined in the starting state of the <a href="qml-transition.html">Transition</a>, or the current value of the property at the moment the <a href="qml-behavior.html">Behavior</a> is triggered.</p>
<p><b>See also </b><a href="qdeclarativeanimation.html">QML Animation and Transitions</a>.</p>
</div></div><!-- @@@from -->
<br/>
<!-- $$$to -->
<div class="qmlitem"><div class="qmlproto"><table class="qmlname"><tr valign="top" class="odd"><td class="tblQmlPropNode"><p><a name="to-prop"></a><span class="name">to</span> : <span class="type"><a href="qml-real.html">real</a></span></p></td></tr></table></div><div class="qmldoc"><p>This property holds the end value for the animation..</p>
<p>If the <a href="qml-rotationanimation.html">RotationAnimation</a> is defined within a <a href="qml-transition.html">Transition</a> or <a href="qml-behavior.html">Behavior</a>, this value defaults to the value defined in the end state of the <a href="qml-transition.html">Transition</a>, or the value of the property change that triggered the <a href="qml-behavior.html">Behavior</a>.</p>
<p><b>See also </b><a href="qdeclarativeanimation.html">QML Animation and Transitions</a>.</p>
</div></div><!-- @@@to -->
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