Qt Reference Documentation

QML RotationAnimation Element

The RotationAnimation element animates changes in rotation values. More...

Inherits PropertyAnimation

  • List of all members, including inherited members
  • Properties

    Detailed Description

    RotationAnimation is a specialized PropertyAnimation that gives control over the direction of rotation during an animation.

    By default, it rotates in the direction of the numerical change; a rotation from 0 to 240 will rotate 220 degrees clockwise, while a rotation from 240 to 0 will rotate 220 degrees counterclockwise. The direction property can be set to specify the direction in which the rotation should occur.

    In the following example we use RotationAnimation to animate the rotation between states via the shortest path:

     import Qt 4.7
    
     Item {
         width: 300; height: 300
    
         Rectangle {
             id: rect
             width: 150; height: 100; anchors.centerIn: parent
             color: "red"
             smooth: 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" }
     }

    Notice the RotationAnimation did not need to set a target 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 properties or property.

    Like any other animation element, a RotationAnimation can be applied in a number of ways, including transitions, behaviors and property value sources. The QML Animation documentation shows a variety of methods for creating animations.

    See also QML Animation and Animation basics example.

    Property Documentation

    direction : enumeration

    This property holds the direction of the rotation.

    Possible values are:

    • RotationAnimation.Numerical (default) - Rotate by linearly interpolating between the two numbers. A rotation from 10 to 350 will rotate 340 degrees clockwise.
    • RotationAnimation.Clockwise - Rotate clockwise between the two values
    • RotationAnimation.Counterclockwise - Rotate counterclockwise between the two values
    • RotationAnimation.Shortest - Rotate in the direction that produces the shortest animation path. A rotation from 10 to 350 will rotate 20 degrees counterclockwise.

    from : real

    This property holds the starting number value.

    For example, the following animation is not applied until the angle value has reached 100:

     Item {
         states: [ ... ]
    
         transition: Transition {
             RotationAnimation { properties: "angle"; from: 100; duration: 2000 }
         }
     }

    If this value is not set, it defaults to the value defined in the start state of the Transition.


    to : real

    This property holds the ending value.

    If this value is not set, it defaults to the value defined in the end state of the Transition or Behavior.


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