Step 7: Getting accelerometer data

1. Include the QAccelerometer header file and add a private member for accelerometer data by adding the following lines into sensorsapidialog.h:
#include <QAccelerometer> private: QAccelerometer *accelerometer;
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2. Define an update slot method to read accelerometer sensor data, by adding the following lines into sensorsapidialog.h:
public slots: void lock(); /** * Called when the readings are changed. */ void updateRotation(); void updateAccelerometer();
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3. Update the setupGeneral() method for accelerometer in sensorsapidialog.cpp.
void SensorsAPIDialog::setupGeneral() { // Initialise and start the accelerometer accelerometer = new QAccelerometer(this); // Add filter to listen accelerometer changes accelerometer->addFilter(this); accelerometer->start(); if (!accelerometer->isActive()) { qWarning("AccelerometerSensor didn't start!"); } }
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4. Implement the updateAccelerometer() method to handle accelerometer changes and modify the destructor to handle accelerometer in sensorsapidialog.cpp.
void SensorsAPIDialog::updateAccelerometer() { // Read the accelerometer data and output it to the screen QAccelerometerReading *accReading = accelerometer->reading(); QString output = QString("Accelerometer: %1 x %2 y %3 z"). arg(accReading->x()). arg(accReading->y()). arg(accReading->z()); ui->AccelerometerValue->setText(output); } ... SensorsAPIDialog::~SensorsAPIDialog() { delete ui; delete accelerometer; delete rotationSensor; }
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