示例#1
0
inline typename Cylinder<T>::position_type
random_position(Cylinder<T> const& shape, Trng& rng)
{
    // -1 < rng() < 1. See for example CylindricalSurface.hpp.
    return add(shape.position(),
               multiply(shape.unit_z(), rng() * shape.half_length()));
}
示例#2
0
inline typename Cylinder<T_>::length_type
distance(Cylinder<T_> const& obj,
                typename Cylinder<T_>::position_type const& pos)
{
    typedef typename Cylinder<T_>::position_type position_type;
    typedef typename Cylinder<T_>::length_type length_type;

    /* First compute the (z,r) components of pos in a coordinate system 
     * defined by the vectors unitR and unit_z, where unitR is
     * choosen such that unitR and unit_z define a plane in which
     * pos lies. */
    const std::pair<length_type, length_type> r_z(to_internal(obj, pos));

    /* Then compute distance to cylinder. */
    const length_type dz(std::fabs(r_z.second) - obj.half_length());
    const length_type dr(r_z.first - obj.radius());
    length_type distance;
    if (dz > 0)
    {
        // pos is (either) to the right or to the left of the cylinder.
        if (r_z.first > obj.radius())
        {
            // Compute distance to edge.
            distance = std::sqrt( dz * dz + dr * dr );
        }
        else
        {
            distance = dz;
        }
    }
    else
    {
        if (dr > obj.radius())
        {
            // pos is somewhere 'parallel' to the cylinder.
            distance = dr;
        }
        else
        {
            // Inside cylinder. 
            distance = std::max(dr, dz);
        }
    }
    return distance;
}
示例#3
0
 bool operator==(const Cylinder& rhs) const
 {
     return position_ == rhs.position() && radius_ == rhs.radius() && unit_z_ == rhs.unit_z() && half_length_ == rhs.half_length();
 }