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<h1 class="title">QML SmoothedAnimation Element</h1>
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<span class="subtitle"></span>
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<!-- $$$SmoothedAnimation-brief -->
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<p>The SmoothedAnimation element allows a property to smoothly track a value. <a href="#details">More...</a></p>
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<!-- @@@SmoothedAnimation -->
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<p>Inherits <a href="qml-numberanimation.html">NumberAnimation</a></p>
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<p>This element was introduced in Qt 4.7.</p>
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<ul>
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<li><a href="qml-smoothedanimation-members.html">List of all members, including inherited members</a></li>
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<a name="properties"></a>
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<h2>Properties</h2>
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<ul>
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<li class="fn"><b><b><a href="qml-smoothedanimation.html#duration-prop">duration</a></b></b> : int</li>
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<li class="fn"><b><b><a href="qml-smoothedanimation.html#maximumEasingTime-prop">maximumEasingTime</a></b></b> : int</li>
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<li class="fn"><b><b><a href="qml-smoothedanimation.html#reversingMode-prop">reversingMode</a></b></b> : enumeration</li>
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<li class="fn"><b><b><a href="qml-smoothedanimation.html#velocity-prop">velocity</a></b></b> : real</li>
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</ul>
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<!-- $$$SmoothedAnimation-description -->
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<a name="details"></a>
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<h2>Detailed Description</h2>
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<p>A SmoothedAnimation animates a property's value to a set target value using an ease in/out quad easing curve. When the target value changes, the easing curves used to animate between the old and new target values are smoothly spliced together to create a smooth movement to the new target value that maintains the current velocity.</p>
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<p>The follow example shows one <a href="qml-rectangle.html">Rectangle</a> tracking the position of another using SmoothedAnimation. The green rectangle's <tt>x</tt> and <tt>y</tt> values are bound to those of the red rectangle. Whenever these values change, the green rectangle smoothly animates to its new position:</p>
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<pre class="qml"> import QtQuick 1.0
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<span class="type"><a href="qml-rectangle.html">Rectangle</a></span> {
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<span class="name">width</span>: <span class="number">800</span>; <span class="name">height</span>: <span class="number">600</span>
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<span class="name">color</span>: <span class="string">"blue"</span>
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<span class="type"><a href="qml-rectangle.html">Rectangle</a></span> {
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<span class="name">width</span>: <span class="number">60</span>; <span class="name">height</span>: <span class="number">60</span>
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<span class="name">x</span>: <span class="name">rect1</span>.<span class="name">x</span> <span class="operator">-</span> <span class="number">5</span>; <span class="name">y</span>: <span class="name">rect1</span>.<span class="name">y</span> <span class="operator">-</span> <span class="number">5</span>
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<span class="name">color</span>: <span class="string">"green"</span>
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Behavior on <span class="name">x</span> { <span class="type">SmoothedAnimation</span> { <span class="name">velocity</span>: <span class="number">200</span> } }
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Behavior on <span class="name">y</span> { <span class="type">SmoothedAnimation</span> { <span class="name">velocity</span>: <span class="number">200</span> } }
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}
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<span class="type"><a href="qml-rectangle.html">Rectangle</a></span> {
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<span class="name">id</span>: <span class="name">rect1</span>
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<span class="name">width</span>: <span class="number">50</span>; <span class="name">height</span>: <span class="number">50</span>
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<span class="name">color</span>: <span class="string">"red"</span>
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}
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<span class="name">focus</span>: <span class="number">true</span>
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<span class="name">Keys</span>.onRightPressed: <span class="name">rect1</span>.<span class="name">x</span> <span class="operator">=</span> <span class="name">rect1</span>.<span class="name">x</span> <span class="operator">+</span> <span class="number">100</span>
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<span class="name">Keys</span>.onLeftPressed: <span class="name">rect1</span>.<span class="name">x</span> <span class="operator">=</span> <span class="name">rect1</span>.<span class="name">x</span> <span class="operator">-</span> <span class="number">100</span>
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<span class="name">Keys</span>.onUpPressed: <span class="name">rect1</span>.<span class="name">y</span> <span class="operator">=</span> <span class="name">rect1</span>.<span class="name">y</span> <span class="operator">-</span> <span class="number">100</span>
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<span class="name">Keys</span>.onDownPressed: <span class="name">rect1</span>.<span class="name">y</span> <span class="operator">=</span> <span class="name">rect1</span>.<span class="name">y</span> <span class="operator">+</span> <span class="number">100</span>
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}</pre>
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<p>A SmoothedAnimation can be configured by setting the <a href="qml-smoothedanimation.html#velocity-prop">velocity</a> at which the animation should occur, or the <a href="qml-smoothedanimation.html#duration-prop">duration</a> that the animation should take. If both the <a href="qml-smoothedanimation.html#velocity-prop">velocity</a> and <a href="qml-smoothedanimation.html#duration-prop">duration</a> are specified, the one that results in the quickest animation is chosen for each change in the target value.</p>
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<p>For example, animating from 0 to 800 will take 4 seconds if a velocity of 200 is set, will take 8 seconds with a duration of 8000 set, and will take 4 seconds with both a velocity of 200 and a duration of 8000 set. Animating from 0 to 20000 will take 10 seconds if a velocity of 200 is set, will take 8 seconds with a duration of 8000 set, and will take 8 seconds with both a velocity of 200 and a duration of 8000 set.</p>
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<p>The default velocity of SmoothedAnimation is 200 units/second. Note that if the range of the value being animated is small, then the velocity will need to be adjusted appropriately. For example, the opacity of an item ranges from 0 - 1.0. To enable a smooth animation in this range the velocity will need to be set to a value such as 0.5 units/second. Animating from 0 to 1.0 with a velocity of 0.5 will take 2000 ms to complete.</p>
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<p>Like any other animation element, a SmoothedAnimation 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>
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<p><b>See also </b><a href="qml-springanimation.html">SpringAnimation</a>, <a href="qml-numberanimation.html">NumberAnimation</a>, <a href="qdeclarativeanimation.html">QML Animation and Transitions</a>, and Animation basics example.</p>
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<!-- @@@SmoothedAnimation -->
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<h2>Property Documentation</h2>
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<!-- $$$duration -->
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<div class="qmlitem"><div class="qmlproto"><table class="qmlname"><tr valign="top" class="odd"><td class="tblQmlPropNode"><p><a name="duration-prop"></a><span class="name">duration</span> : <span class="type"><a href="qml-int.html">int</a></span></p></td></tr></table></div><div class="qmldoc"><p>This property holds the animation duration, in msecs, used when tracking the source.</p>
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<p>Setting this to -1 (the default) disables the duration value.</p>
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<p>If the velocity value and the duration value are both enabled, then the animation will use whichever gives the shorter duration.</p>
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</div></div><!-- @@@duration -->
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<br/>
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<!-- $$$maximumEasingTime -->
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<div class="qmlitem"><div class="qmlproto"><table class="qmlname"><tr valign="top" class="odd"><td class="tblQmlPropNode"><p><a name="maximumEasingTime-prop"></a><span class="name">maximumEasingTime</span> : <span class="type"><a href="qml-int.html">int</a></span></p></td></tr></table></div><div class="qmldoc"><p>This property specifies the maximum time, in msecs, any "eases" during the follow should take. Setting this property causes the velocity to "level out" after at a time. Setting a negative value reverts to the normal mode of easing over the entire animation duration.</p>
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<p>The default value is -1.</p>
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</div></div><!-- @@@maximumEasingTime -->
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<br/>
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<!-- $$$reversingMode -->
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<div class="qmlitem"><div class="qmlproto"><table class="qmlname"><tr valign="top" class="odd"><td class="tblQmlPropNode"><p><a name="reversingMode-prop"></a><span class="name">reversingMode</span> : <span class="type"><a href="qml-enumeration.html">enumeration</a></span></p></td></tr></table></div><div class="qmldoc"><p>Sets how the <a href="qml-smoothedanimation.html">SmoothedAnimation</a> behaves if an animation direction is reversed.</p>
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<p>Possible values are:</p>
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<ul>
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<li><a href="qml-smoothedanimation.html">SmoothedAnimation</a>.Eased (default) - the animation will smoothly decelerate, and then reverse direction</li>
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<li><a href="qml-smoothedanimation.html">SmoothedAnimation</a>.Immediate - the animation will immediately begin accelerating in the reverse direction, beginning with a velocity of 0</li>
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<li><a href="qml-smoothedanimation.html">SmoothedAnimation</a>.Sync - the property is immediately set to the target value</li>
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</ul>
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</div></div><!-- @@@reversingMode -->
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<br/>
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<!-- $$$velocity -->
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<div class="qmlitem"><div class="qmlproto"><table class="qmlname"><tr valign="top" class="odd"><td class="tblQmlPropNode"><p><a name="velocity-prop"></a><span class="name">velocity</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 average velocity allowed when tracking the 'to' value.</p>
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<p>The default velocity of <a href="qml-smoothedanimation.html">SmoothedAnimation</a> is 200 units/second.</p>
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<p>Setting this to -1 disables the velocity value.</p>
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<p>If the velocity value and the duration value are both enabled, then the animation will use whichever gives the shorter duration.</p>
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</div></div><!-- @@@velocity -->
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