Function angularDistance

zodiacgraph/node.cpp:805–815

\brief Calculates the angular distance between two angles, always returning a positive result. \param [in] alpha First angle. \param [in] beta Second angle. \return Angular distance in postive radian [0 -> pi].

/// \return             Angular distance in postive radian [0 -> pi].
///
static qreal angularDistance(qreal alpha, qreal beta)
{
    static const qreal TWO_PI = M_PI*2;

    qreal result = qAbs(alpha-beta);
    if(result>M_PI){
        return TWO_PI-result;
    } else {
        return result;
    }
}