import Qt 4.7

Rectangle {

    color: "#ffffff"

    width: 320; height: 240

    Rectangle {

        id: rect

        color: "#00ff00"

        y: 200; width: 60; height: 20

        SequentialAnimation on y {

            loops: Animation.Infinite

            NumberAnimation {

                to: 20; duration: 500

                easing.type: "InOutQuad"

            }

            NumberAnimation {

                to: 200; duration: 2000

                easing.type: "OutBounce"

            }

            PauseAnimation { duration: 1000 }

        }

    }

    // Velocity

    Rectangle {

        color: "#ff0000"

        x: rect.width; width: rect.width; height: 20

        y: rect.y

        Behavior on y { SpringAnimation { velocity: 200 } }

    }

    // Spring

    Rectangle {

        color: "#ff0000"

        x: rect.width * 2; width: rect.width/2; height: 20

        y: rect.y

        Behavior on y { SpringAnimation { spring: 1.0; damping: 0.2 } }

    }

    Rectangle {

        color: "#880000"

        x: rect.width * 2.5; width: rect.width/2; height: 20

        y: rect.y

        Behavior on y { SpringAnimation { spring: 1.0; damping: 0.2; mass: 3.0 } } // "heavier" object

    }

    // Follow mouse

    MouseArea {

        id: mouseRegion

        anchors.fill: parent

        Rectangle {

            id: ball

            property int targetX: mouseRegion.mouseX - 10

            property int targetY: mouseRegion.mouseY - 10

            x: targetX

            y: targetY

            width: 20; height: 20

            radius: 10

            color: "#0000ff"

            Behavior on x { SpringAnimation { spring: 1.0; damping: 0.05; epsilon: 0.25 } }

            Behavior on y { SpringAnimation { spring: 1.0; damping: 0.05; epsilon: 0.25 } }

            states: [

                State {

                    name: "following"

                    when: ball.x != ball.targetX || ball.y != ball.targetY

                    PropertyChanges { target: ball; color: "#ff0000" }

                }

            ]

            transitions: [

                Transition {

                    ColorAnimation { duration: 200 }

                }

            ]

        }

    }

}