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path: root/examples/declarative/follow/pong.qml
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Rect {
    id: Page
    width: 640
    height: 480
    color: "#000000"
    // Make a ball to bounce
    Rect {
        id: Ball
        x: 20
        width: 20
        height: 20
        color: "#00ee00"
        z: 1
        // Add a property for the target y coordinate
        properties: Property {
            name: "targetY"
            value: Page.height-10
        }
        properties: Property {
            name: "direction"
            value: "right"
        }
        // Move the ball to the right and back to the left repeatedly
        x: SequentialAnimation {
            running: true
            repeat: true
            NumericAnimation {
                to: Page.width-40
                duration: 2000
            }
            SetPropertyAction {
                target: Ball
                property: "direction"
                value: "left"
            }
            NumericAnimation {
                to: 20
                duration: 2000
            }
            SetPropertyAction {
                target: Ball
                property: "direction"
                value: "right"
            }
        }
        // Make y follow the target y coordinate, with a velocity of 200
        y: Follow {
            source: Ball.targetY
            velocity: 200
        }
        // Detect the ball hitting the top or bottom of the view and bounce it
        onTopChanged: { if (y <= 0)
                targetY = Page.height-20;
            else if (y >= Page.height-20)
                targetY = 0; }
    }
    // Place bats to the left and right of the view, following the y
    // coordinates of the ball.
    Rect {
        id: LeftBat
        color: "#00ee00"
        x: 2
        width: 20
        height: 90
        y: Follow {
            source: Ball.y-45
            velocity: 300
            enabled: Ball.direction == 'left'
        }
    }
    Rect {
        id: RightBat
        x: Page.width-22
        color: "#00ee00"
        width: 20
        height: 90
        y: Follow {
            source: Ball.y-45
            velocity: 300
            enabled: Ball.direction == 'right'
        }
    }
    // The rest, to make it look realistic, if neither ever scores...
    Rect {
        color: "#00ee00"
        width: 40
        height: 60
        x: 320-80
    }
    Rect {
        color: "#000000"
        width: 20
        height: 40
        x: 320-70
        y: 10
    }
    Rect {
        color: "#00ee00"
        width: 40
        height: 60
        x: 320+40
    }
    Rect {
        color: "#000000"
        width: 20
        height: 40
        x: 320+50
        y: 10
    }
    Repeater {
        dataSource: 24
        Rect {
            color: "#00ee00"
            width: 10
            height: 10
            x: 320-5
            y: index*20
        }
    }
}