axis_aligned_box.h

#pragma once
 
#include <cgv/type/standard_types.h>
#include <cgv/math/vec.h>
#include <cgv/math/fvec.h>
 
namespace cgv {
namespace media {
 
template<typename T, cgv::type::uint32_type N>
class axis_aligned_box
{
public:
    typedef cgv::math::fvec<T,N> fpnt_type;
    typedef cgv::math::fvec<T,N> fvec_type;
    typedef cgv::math::vec<T> pnt_type;
    typedef cgv::math::vec<T> vec_type;
protected:
    fpnt_type minp;
    fpnt_type maxp;
public:
    axis_aligned_box() { invalidate(); }
    template <typename S>
    axis_aligned_box(const axis_aligned_box<S, N>& other) : minp(other.get_min_pnt()), maxp(other.get_max_pnt()) {}
    axis_aligned_box(const fpnt_type& minp, const fpnt_type& maxp) : minp(minp), maxp(maxp) {}
    axis_aligned_box(const pnt_type& _minp, const pnt_type& _maxp)
    {
        invalidate();
        unsigned i;
        for (i=0; i<_minp.size(); ++i) {
            if (i == N)
                break;
            minp(i) = _minp(i);
        }
        for (i=0; i<_maxp.size(); ++i) {
            if (i == N)
                break;
            maxp(i) = _maxp(i);
        }
    }
    void invalidate() {
        minp = T(1);
        maxp = T(0);
    }
    const fpnt_type& get_min_pnt() const { return minp; }
    const fpnt_type& get_max_pnt() const { return maxp; }
    fpnt_type& ref_min_pnt() { return minp; }
    fpnt_type& ref_max_pnt() { return maxp; }
    fpnt_type get_corner(int i) const
    {
        fpnt_type c = minp;
        int bit = 1;
        for (unsigned int dim=0; dim < N; ++dim, bit *= 2)
            if (i & bit)
                c(dim) = maxp(dim);
        return c;
    }
    fvec_type get_alpha(const fvec_type& p) const { return (p-minp) / (maxp-minp); }
    fvec_type get_extent() const { return maxp-minp; }
    fpnt_type get_center() const { return (minp+maxp)/2; }
    bool is_valid() const { return minp[0] <= maxp[0]; }
    bool inside(const fpnt_type& p) const {
        for (unsigned int c = 0; c<N; ++c) {
            if (p(c) < minp(c)) return false;
            if (p(c) >= maxp(c)) return false;
        }
        return true;
    }
    void add_point(const fpnt_type& p) {
        if (is_valid()) {
            for (unsigned int c = 0; c<N; ++c) {
                if (p(c) > maxp(c)) maxp(c) = p(c);
                if (p(c) < minp(c)) minp(c) = p(c);
            }
        }
        else
            minp = maxp = p;
    }
    void add_point(const pnt_type& p) {
        if (is_valid()) {
            for (unsigned int c = 0; p.size(); ++c) {
                if (c == N)
                    break;
                if (p(c) > maxp(c)) maxp(c) = p(c);
                if (p(c) < minp(c)) minp(c) = p(c);
            }
        }
        else
            *this = axis_aligned_box<T,N>(p,p);
    }
    void add_axis_aligned_box(const axis_aligned_box<T,N>& aab) {
        if (!aab.is_valid())
            return;
        add_point(aab.minp);
        add_point(aab.maxp);
    }
    axis_aligned_box<T,N> intersect(const axis_aligned_box<T,N>& aab) {
        fpnt_type min_p = minp;
        fpnt_type max_p = maxp;
        if (!aab.is_valid())
            return axis_aligned_box<T, N>(min_p, max_p);
        
        for (unsigned int c = 0; c<N; ++c) {
            if (aab.maxp(c) < maxp(c)) max_p(c) = aab.maxp(c);
            if (aab.minp(c) > minp(c)) min_p(c) = aab.minp(c);
        }
        return axis_aligned_box<T, N>(min_p, max_p);
    }
    void scale(const T& f)
    {
        if (!is_valid())
            return;
        for (unsigned int c = 0; c<N; ++c) {
            maxp(c) *= f;
            minp(c) *= f;
        }
    }
    void translate(const fpnt_type& v)
    {
        if (!is_valid())
            return;
        ref_min_pnt() += v;
        ref_max_pnt() += v;
    }
    unsigned get_max_extent_coord_index() const
    {
        fvec_type e = get_extent();
        unsigned j = 0;
        for (unsigned i=1; i<N; ++i)
            if (e(i) > e(j))
                j = i;
        return j;
    }
};
 
template<typename T, cgv::type::uint32_type N>
std::ostream& operator<<(std::ostream& out, const axis_aligned_box<T, N>& box)
{
    return out << box.get_min_pnt() << "->" << box.get_max_pnt();
}
 
} // namespace media
 
 
typedef cgv::media::axis_aligned_box<float, 2> box2;
typedef cgv::media::axis_aligned_box<float, 3> box3;
typedef cgv::media::axis_aligned_box<float, 4> box4;
 
typedef cgv::media::axis_aligned_box<double, 2> dbox2;
typedef cgv::media::axis_aligned_box<double, 3> dbox3;
typedef cgv::media::axis_aligned_box<double, 4> dbox4;
 
typedef cgv::media::axis_aligned_box<int16_t, 2> sbox2;
typedef cgv::media::axis_aligned_box<int16_t, 3> sbox3;
typedef cgv::media::axis_aligned_box<int16_t, 4> sbox4;
typedef cgv::media::axis_aligned_box<uint16_t, 2> usbox2;
typedef cgv::media::axis_aligned_box<uint16_t, 3> usbox3;
typedef cgv::media::axis_aligned_box<uint16_t, 4> usbox4;
 
typedef cgv::media::axis_aligned_box<int32_t, 2> ibox2;
typedef cgv::media::axis_aligned_box<int32_t, 3> ibox3;
typedef cgv::media::axis_aligned_box<int32_t, 4> ibox4;
typedef cgv::media::axis_aligned_box<uint32_t, 2> ubox2;
typedef cgv::media::axis_aligned_box<uint32_t, 3> ubox3;
typedef cgv::media::axis_aligned_box<uint32_t, 4> ubox4;
 
typedef cgv::media::axis_aligned_box<int64_t, 2> lbox2;
typedef cgv::media::axis_aligned_box<int64_t, 3> lbox3;
typedef cgv::media::axis_aligned_box<int64_t, 4> lbox4;
typedef cgv::media::axis_aligned_box<uint64_t, 2> ulbox2;
typedef cgv::media::axis_aligned_box<uint64_t, 3> ulbox3;
typedef cgv::media::axis_aligned_box<uint64_t, 4> ulbox4;
 
 
} // namespace cgv