QML实现呼吸动画
时间: 2024-02-17 08:03:53 浏览: 15
可以使用QML的PropertyAnimation和SequentialAnimation来实现呼吸动画。
首先,定义一个圆形(或其他形状)的Item,例如:
```
Item {
id: circle
width: 100
height: 100
radius: width/2
color: "red"
}
```
然后,定义两个PropertyAnimation,一个用于放大圆形,一个用于缩小圆形:
```
PropertyAnimation {
id: inhaleAnim
target: circle
property: "scale"
to: 1.2
duration: 1000
}
PropertyAnimation {
id: exhaleAnim
target: circle
property: "scale"
to: 1
duration: 1000
}
```
接着,定义一个SequentialAnimation,将两个PropertyAnimation组合起来:
```
SequentialAnimation {
id: breathAnim
loops: Animation.Infinite
PropertyAnimation {
target: circle
property: "opacity"
to: 1
duration: 0
}
inhaleAnim
exhaleAnim
}
```
最后,在需要使用呼吸动画的地方调用breathAnim.start()即可。
完整的代码如下所示:
```
Item {
id: circle
width: 100
height: 100
radius: width/2
color: "red"
SequentialAnimation {
id: breathAnim
loops: Animation.Infinite
PropertyAnimation {
target: circle
property: "opacity"
to: 1
duration: 0
}
PropertyAnimation {
id: inhaleAnim
target: circle
property: "scale"
to: 1.2
duration: 1000
}
PropertyAnimation {
id: exhaleAnim
target: circle
property: "scale"
to: 1
duration: 1000
}
}
}
```
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