property-animation.qml Example File

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 import QtQuick 1.0

 Item {
     id: window
     width: 320; height: 480

     // Let's draw the sky...
     Rectangle {
         anchors { left: parent.left; top: parent.top; right: parent.right; bottom: parent.verticalCenter }
         gradient: Gradient {
             GradientStop { position: 0.0; color: "DeepSkyBlue" }
             GradientStop { position: 1.0; color: "LightSkyBlue" }
         }
     }

     // ...and the ground.
     Rectangle {
         anchors { left: parent.left; top: parent.verticalCenter; right: parent.right; bottom: parent.bottom }
         gradient: Gradient {
             GradientStop { position: 0.0; color: "ForestGreen" }
             GradientStop { position: 1.0; color: "DarkGreen" }
         }
     }

     // The shadow for the smiley face
     Image {
         anchors.horizontalCenter: parent.horizontalCenter
         y: smiley.minHeight + 58
         source: "images/shadow.png"

         // The scale property depends on the y position of the smiley face.
         scale: smiley.y * 0.5 / (smiley.minHeight - smiley.maxHeight)
     }

     Image {
         id: smiley
         property int maxHeight: window.height / 3
         property int minHeight: 2 * window.height / 3

         anchors.horizontalCenter: parent.horizontalCenter
         y: minHeight
         source: "images/face-smile.png"

         // Animate the y property. Setting loops to Animation.Infinite makes the
         // animation repeat indefinitely, otherwise it would only run once.
         SequentialAnimation on y {
             loops: Animation.Infinite

             // Move from minHeight to maxHeight in 300ms, using the OutExpo easing function
             NumberAnimation {
                 from: smiley.minHeight; to: smiley.maxHeight
                 easing.type: Easing.OutExpo; duration: 300
             }

             // Then move back to minHeight in 1 second, using the OutBounce easing function
             NumberAnimation {
                 from: smiley.maxHeight; to: smiley.minHeight
                 easing.type: Easing.OutBounce; duration: 1000
             }

             // Then pause for 500ms
             PauseAnimation { duration: 500 }
         }
     }
 }