RotationAnimation QML Type

Animates changes in rotation values. 更多...

import 语句：	import QtQuick 2.2
继承：	PropertyAnimation

所有成员列表，包括继承成员

特性

direction : enumeration
from : real
to : real

详细描述

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 240 degrees clockwise, while a rotation from 240 to 0 will rotate 240 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 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" }
}

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 .

Also, note the Rectangle will be rotated around its default transformOrigin (which is Item.Center ). To use a different transform origin, set the origin in the PropertyChanges object and apply the change at the start of the animation using PropertyAction 。见 PropertyAction 文档编制了解更多细节。

Like any other animation type, a RotationAnimation can be applied in a number of ways, including transitions, behaviors and property value sources. The Qt Quick 中的动画和过渡 documentation shows a variety of methods for creating animations.

另请参阅 Qt Quick 中的动画和过渡 and Qt Quick Examples - Animation .

特性文档编制

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 value for the animation.

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

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

若 RotationAnimation is defined within a Transition or Behavior , this value defaults to the value defined in the starting state of the Transition , or the current value of the property at the moment the Behavior 被触发。

另请参阅 Qt Quick 中的动画和过渡 .

to : real

This property holds the end value for the animation..

若 RotationAnimation is defined within a Transition or Behavior , this value defaults to the value defined in the end state of the Transition , or the value of the property change that triggered the Behavior .

另请参阅 Qt Quick 中的动画和过渡 .