qt-creator/doc/examples/accelbubble/main.qml

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import QtQuick 2.7
import QtQuick.Controls 2.0
import QtQuick.Layouts 1.0
import QtSensors 5.7

ApplicationWindow {
    visible: true
    width: 640
    height: 480
    title: qsTr("Accelerate Bubble")

    Page1 {
        anchors.fill: parent
        bubble {
            id: bubble
            centerX: mainWindow.width / 2
            centerY: mainWindow.height / 2
            bubbleCenter: bubble.width / 2
            x: bubble.centerX - bubble.bubbleCenter
            y: bubble.centerY - bubble.bubbleCenter

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

    Accelerometer {
           id: accel
           dataRate: 100
           active: true

           onReadingChanged: {
               var newX = (bubble.x + calcRoll(accel.reading.x, accel.reading.y, accel.reading.z) * 0.1)
               var newY = (bubble.y - calcPitch(accel.reading.x, accel.reading.y, accel.reading.z) * 0.1)

               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);
       }
}