- Qt 5.5
- Qt Sensors
- Qt Sensors - Accel Bubble
- accelbubble.qml Example File
- Qt 5.5.1 Reference Documentation

# accelbubble.qml Example File

accelbubble/accelbubble.qml

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the QtSensors module of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
    ** You may use this file under the terms of the BSD license as follows:
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    ** modification, are permitted provided that the following conditions are
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    **     from this software without specific prior written permission.
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    import QtQuick 2.1
    import QtQuick.Controls 1.0

    import QtSensors 5.0

    ApplicationWindow {
        title: "Accelerate Bubble"
        id: mainWindow
        width: 320
        height: 480
        visible: true

        Accelerometer {
            id: accel
            dataRate: 100
            active:true

            onReadingChanged: {
                var newX = (bubble.x + calcRoll(accel.reading.x, accel.reading.y, accel.reading.z) * .1)
                var newY = (bubble.y - calcPitch(accel.reading.x, accel.reading.y, accel.reading.z) * .1)

                if (isNaN(newX) || isNaN(newY))
                    return;

                if (newX < 0)
                    newX = 0

                if (newX > mainWindow.width - bubble.width)
                    newX = mainWindow.width - bubble.width

                if (newY < 18)
                    newY = 18

                if (newY > mainWindow.height - bubble.height)
                    newY = mainWindow.height - bubble.height

                    bubble.x = newX
                    bubble.y = newY
            }
        }

        function calcPitch(x,y,z) {
            return -(Math.atan(y / Math.sqrt(x * x + z * z)) * 57.2957795);
        }
        function calcRoll(x,y,z) {
             return -(Math.atan(x / Math.sqrt(y * y + z * z)) * 57.2957795);
        }

        Image {
            id: bubble
            source: "content/Bluebubble.svg"
            smooth: true
            property real centerX: mainWindow.width / 2
            property real centerY: mainWindow.height / 2
            property real bubbleCenter: bubble.width / 2
            x: centerX - bubbleCenter
            y: centerY - bubbleCenter

            Behavior on y {
                SmoothedAnimation {
                    easing.type: Easing.Linear
                    duration: 100
                }
            }
            Behavior on x {
                SmoothedAnimation {
                    easing.type: Easing.Linear
                    duration: 100
                }
            }
        }
    }