added gps support

added compass support
added ui elements for gps and compass
added support for writing sensor data

sensors/SensorWriter.h

@@ -0,0 +1,101 @@
+#ifndef SENSORWRITER_H
+#define SENSORWRITER_H
+
+#include "AccelerometerSensor.h"
+#include "GyroscopeSensor.h"
+#include "BarometerSensor.h"
+#include "StepSensor.h"
+#include "TurnSensor.h"
+#include "WiFiSensor.h"
+#include "ActivitySensor.h"
+#include "GPSSensor.h"
+#include "CompassSensor.h"
+#include "SensorFactory.h"
+
+#include <Indoor/sensors/offline/FileWriter.h>
+
+/**
+ * receives live sensor data
+ * writes it to a file
+ */
+class SensorWriter :
+		public SensorListener<AccelerometerData>,
+		public SensorListener<GyroscopeData>,
+		public SensorListener<BarometerData>,
+//		public SensorListener<ActivityData>,
+//		public SensorListener<StepData>,
+//		public SensorListener<TurnData>,
+		public SensorListener<WiFiMeasurements>,
+		public SensorListener<GPSData>,
+		public SensorListener<CompassData> {
+
+private:
+
+	Offline::FileWriter writer;
+	bool active = false;
+
+public:
+
+	/** empty ctor */
+	SensorWriter() {
+
+		// attach as listener to all sensors we want to store
+		SensorFactory::get().getAccelerometer().addListener(this);
+		SensorFactory::get().getGyroscope().addListener(this);
+		SensorFactory::get().getBarometer().addListener(this);
+//		SensorFactory::get().getActivity().addListener(this);
+//		SensorFactory::get().getSteps().addListener(this);
+//		SensorFactory::get().getTurns().addListener(this);
+		SensorFactory::get().getWiFi().addListener(this);
+		SensorFactory::get().getCompass().addListener(this);
+		SensorFactory::get().getGPS().addListener(this);
+
+	}
+
+
+
+	void start(const std::string& file) {
+		writer.open(file);
+		active = true;
+	}
+
+	void stop() {
+		active = false;
+		writer.close();
+	}
+
+public:
+
+	virtual void onSensorData(Sensor<AccelerometerData>* , const Timestamp ts, const AccelerometerData& data) override {
+		if (!active) {return;}
+		writer.add(ts, data);
+	}
+
+	virtual void onSensorData(Sensor<GyroscopeData>* , const Timestamp ts, const GyroscopeData& data) override {
+		if (!active) {return;}
+		writer.add(ts, data);
+	}
+
+	virtual void onSensorData(Sensor<BarometerData>* , const Timestamp ts, const BarometerData& data) override {
+		if (!active) {return;}
+		writer.add(ts, data);
+	}
+
+	virtual void onSensorData(Sensor<WiFiMeasurements>* , const Timestamp ts, const WiFiMeasurements& data) override {
+		if (!active) {return;}
+		writer.add(ts, data);
+	}
+
+	virtual void onSensorData(Sensor<GPSData>* , const Timestamp ts, const GPSData& data) override {
+		if (!active) {return;}
+		writer.add(ts, data);
+	}
+
+	virtual void onSensorData(Sensor<CompassData>* , const Timestamp ts, const CompassData& data) override {
+		if (!active) {return;}
+		writer.add(ts, data);
+	}
+
+};
+
+#endif // SENSORWRITER_H