diff options
Diffstat (limited to 'src/plugins/sensors/android/androidrotation.cpp')
-rw-r--r-- | src/plugins/sensors/android/androidrotation.cpp | 41 |
1 files changed, 35 insertions, 6 deletions
diff --git a/src/plugins/sensors/android/androidrotation.cpp b/src/plugins/sensors/android/androidrotation.cpp index c1d141a0..068d305f 100644 --- a/src/plugins/sensors/android/androidrotation.cpp +++ b/src/plugins/sensors/android/androidrotation.cpp @@ -48,12 +48,41 @@ AndroidRotation::AndroidRotation(int type, QSensor *sensor, QObject *parent) void AndroidRotation::dataReceived(const ASensorEvent &event) { - // ### Check me, at first look it seems wrong, - // here https://developer.android.com/reference/android/hardware/SensorEvent.html#sensor.type_rotation_vector: - // are the Android values - qreal rz = -qRadiansToDegrees(qreal(event.data[0])); // event.data[0] corresponds to x - qreal rx = -qRadiansToDegrees(qreal(event.data[1])); // event.data[1] corresponds to y - qreal ry = qRadiansToDegrees(qreal(event.data[2])); // event.data[2] corresponds to z + // From android documentation, the rotation sensor values are: + // values[0]: x*sin(θ/2) + // values[1]: y*sin(θ/2) + // values[2]: z*sin(θ/2) + // values[3]: cos(θ/2) + + // The mathematics below is adapted from + // https://android.googlesource.com/platform/frameworks/base/+/master/core/java/android/hardware/SensorManager.java#1644 + // and + // https://android.googlesource.com/platform/frameworks/base/+/master/core/java/android/hardware/SensorManager.java#1469 + // (getRotationMatrixFromVector() followed by getOrientation()) + qreal angles[3]; + qreal q1 = qreal(event.data[0]); + qreal q2 = qreal(event.data[1]); + qreal q3 = qreal(event.data[2]); + qreal q0 = qreal(event.data[3]); + + qreal sq_q1 = 2 * q1 * q1; + qreal sq_q2 = 2 * q2 * q2; + qreal sq_q3 = 2 * q3 * q3; + qreal q1_q2 = 2 * q1 * q2; + qreal q3_q0 = 2 * q3 * q0; + qreal q1_q3 = 2 * q1 * q3; + qreal q2_q0 = 2 * q2 * q0; + qreal q2_q3 = 2 * q2 * q3; + qreal q1_q0 = 2 * q1 * q0; + + angles[0] = std::atan2((q1_q2 - q3_q0), (1 - sq_q1 - sq_q3)); + angles[1] = std::asin(-(q2_q3 + q1_q0)); + angles[2] = std::atan2(-(q1_q3 - q2_q0), (1 - sq_q1 - sq_q2)); + + qreal rz = -qRadiansToDegrees(angles[0]); + qreal rx = -qRadiansToDegrees(angles[1]); + qreal ry = qRadiansToDegrees(angles[2]); + if (sensor()->skipDuplicates() && qFuzzyCompare(m_reader.x(), rx) && qFuzzyCompare(m_reader.y(), ry) && qFuzzyCompare(m_reader.z(), rz)) { |