accelerationsensor.cpp Example File

    /*
     * Copyright (c) 2011, 2012, 2013  BlackBerry Limited.
     *
     * Licensed under the Apache License, Version 2.0 (the "License");
     * you may not use this file except in compliance with the License.
     * You may obtain a copy of the License at
     *
     * http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing, software
     * distributed under the License is distributed on an "AS IS" BASIS,
     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     * See the License for the specific language governing permissions and
     * limitations under the License.
     */

    #include <QDebug>

    #include "accelerationsensor.hpp"

    AccelerationSensor::AccelerationSensor(QObject *parent)
        : QObject(parent)
        , m_x(0)
        , m_y(0)
        , m_z(0)
    {
        // At first we have to connect to the sensor backend...
        if (!m_accelerationSensor.connectToBackend())
            qWarning() << "Cannot connect to acceleration sensor backend!";

        // ... and then add a filter that will process the read data
        m_accelerationSensor.addFilter(this);

        // Use only the gravity information
        m_accelerationSensor.setAccelerationMode(QAccelerometer::Gravity);

        // Automatically map the sensor information according to current device orientation
        m_accelerationSensor.setAxesOrientationMode(QAccelerometer::AutomaticOrientation);
    }

    qreal AccelerationSensor::x() const
    {
        return m_x;
    }

    qreal AccelerationSensor::y() const
    {
        return m_y;
    }

    qreal AccelerationSensor::z() const
    {
        return m_z;
    }

    void AccelerationSensor::start()
    {
        m_accelerationSensor.start();
    }

    void AccelerationSensor::stop()
    {
        m_accelerationSensor.stop();
    }

    bool AccelerationSensor::filter(QAccelerometerReading *reading)
    {
        // Store the previous values...
        const qreal oldX = m_x;
        const qreal oldY = m_y;
        const qreal oldZ = m_z;

        // ... update the property values with current sensor values
        m_x = reading->x();
        m_y = reading->y();
        m_z = reading->z();

        // ... and emit changed signals
        if (oldX != m_x)
            emit xChanged();
        if (oldY != m_y)
            emit yChanged();
        if (oldZ != m_z)
            emit zChanged();

        // Do no further processing of the sensor data
        return false;
    }