Qt Reference Documentation

# property-animation.qml Example File

declarative/animation/basics/property-animation.qml

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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 }
             }
         }
     }