void Transformable::rotateRad(float radians) {
    setRotationRad(m_rotation + radians * (180 / PI));
}
//------------------------------------------------------------------------------
// onUpdateRadius() - change our radius
//------------------------------------------------------------------------------
bool CompassRose::onUpdateRadius(const Basic::Number* const x)
{
    bool ok = false; 
    if (x != nullptr) ok = setRotationRad(x->getReal());
    return ok;
}