Angle of acceleration.
*/
-QSGGravityAffector::QSGGravityAffector(QSGItem *parent) :
+QSGGravityAffector::QSGGravityAffector(QQuickItem *parent) :
QSGParticleAffector(parent), m_acceleration(-10), m_angle(90), m_xAcc(0), m_yAcc(0)
{
connect(this, SIGNAL(accelerationChanged(qreal)),