- Qt 5.3
- Qt Quick
- Qt Quick Examples - Animation
- tvtennis.qml Example File
- Qt 5.3.2 Reference Documentation

# tvtennis.qml Example File

animation/behaviors/tvtennis.qml

    /****************************************************************************
    **
    ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
    ** Contact: http://www.qt-project.org/legal
    **
    ** This file is part of the examples of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
    ** You may use this file under the terms of the BSD license as follows:
    **
    ** "Redistribution and use in source and binary forms, with or without
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    **     of its contributors may be used to endorse or promote products derived
    **     from this software without specific prior written permission.
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    import QtQuick 2.0

    Rectangle {
        id: page
        width: 320; height: 480;
        color: "Black"

        // Make a ball to bounce
        Rectangle {
            id: ball

            // Add a property for the target y coordinate
            property variant direction : "right"

            x: 20; width: 20; height: 20; z: 1
            color: "Lime"

            // Move the ball to the right and back to the left repeatedly
            SequentialAnimation on x {
                loops: Animation.Infinite
                NumberAnimation { to: page.width - 40; duration: 2000 }
                PropertyAction { target: ball; property: "direction"; value: "left" }
                NumberAnimation { to: 20; duration: 2000 }
                PropertyAction { target: ball; property: "direction"; value: "right" }
            }

            // Make y move with a velocity of 200
            Behavior on y { SpringAnimation{ velocity: 200; }
            }

            Component.onCompleted: y = page.height-10; // start the ball motion

            // Detect the ball hitting the top or bottom of the view and bounce it
            onYChanged: {
                if (y <= 0) {
                    y = page.height - 20;
                } else if (y >= page.height - 20) {
                    y = 0;
                }
            }
        }

        // Place bats to the left and right of the view, following the y
        // coordinates of the ball.
        Rectangle {
            id: leftBat
            color: "Lime"
            x: 2; width: 20; height: 90
            // ![0]
            y: ball.direction == 'left' ? ball.y - 45 : page.height/2 -45;
            Behavior on y { SpringAnimation{ velocity: 300 } }
            // ![0]
        }
        Rectangle {
            id: rightBat
            color: "Lime"
            x: page.width - 22; width: 20; height: 90
            y: ball.direction == 'right' ? ball.y - 45 : page.height/2 -45;
            Behavior on y { SpringAnimation{ velocity: 300 } }
        }

        // The rest, to make it look realistic, if neither ever scores...
        Rectangle { color: "Lime"; x: page.width/2-80; y: 0; width: 40; height: 60 }
        Rectangle { color: "Black"; x: page.width/2-70; y: 10; width: 20; height: 40 }
        Rectangle { color: "Lime"; x: page.width/2+40; y: 0; width: 40; height: 60 }
        Rectangle { color: "Black"; x: page.width/2+50; y: 10; width: 20; height: 40 }
        Repeater {
            model: page.height / 20
            Rectangle { color: "Lime"; x: page.width/2-5; y: index * 20; width: 10; height: 10 }
        }
    }