RebuildAACubeTreeStrategy.h

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#ifndef REBUILDAACUBETREESTRATEGY_HEADER
#define REBUILDAACUBETREESTRATEGY_HEADER
#include <GfxTL/NullClass.h>
#include <GfxTL/VectorXD.h>
#include <limits>
 
template< class InheritedStrategyT >
struct RebuildAACubeTreeStrategy
{
    typedef typename InheritedStrategyT::value_type value_type;
 
    class CellData
        : public InheritedStrategyT::CellData
    {};
 
    template< class BaseT >
    class StrategyBase
        : public InheritedStrategyT::template StrategyBase< BaseT >
    {
public:
        typedef typename InheritedStrategyT::template StrategyBase< BaseT >
        BaseType;
        typedef typename BaseType::CellType CellType;
        typedef typename GfxTL::ScalarTypeDeferer< value_type >::ScalarType
        ScalarType;
        typedef GfxTL::VectorXD< CellType::Dim, ScalarType > PointType;
 
        size_t Rebuild()
        {
            if (!BaseType::Root())
            {
                return 0;
            }
            BaseType::Root()->Range() = typename BaseType::CellRange(
                                            BaseType::BeginHandle(), BaseType::EndHandle());
            //BaseType::Root()->Size(BaseType::size());
            if (!BaseType::Root()->Size() || BaseType::Root()->Size() < BaseType::MaxBucketSize())
            {
                for (unsigned int i = 0; i < CellType::NChildren; ++i)
                {
                    if (this->ExistChild(*BaseType::Root(), i))
                    {
                        delete &((*BaseType::Root())[i]);
                    }
                    BaseType::Root()->Child(i, NULL);
                }
            }
            if (this->IsLeaf(*BaseType::Root()))
            {
                return 0;
            }
            typename BaseType::HandleType cur = BaseType::BeginHandle();
            size_t maxDepth = 0;
            PointType min, max;
            for (unsigned int i = 0; i < BaseType::m_dim; ++i)
            {
                min[i] = -std::numeric_limits< ScalarType >::infinity();
                max[i] = std::numeric_limits< ScalarType >::infinity();
            }
            for (unsigned int i = 0; i < CellType::NChildren; ++i)
            {
                if (!this->ExistChild(*BaseType::Root(), i))
                {
                    continue;
                }
                PointType cmin, cmax;
                for (unsigned int j = 0; j < BaseType::m_dim; ++j)
                {
                    if (i & (1 << (BaseType::m_dim - j - 1)))
                    {
                        cmin[j] = BaseType::Root()->Center()[j];
                        cmax[j] = max[j];
                    }
                    else
                    {
                        cmin[j] = min[j];
                        cmax[j] = BaseType::Root()->Center()[j];
                    }
                }
                size_t d = Rebuild(*BaseType::Root(), i, cmin, cmax, &cur);
                if (d > maxDepth)
                {
                    maxDepth = d;
                }
            }
            BaseType::Root()->Range() = typename BaseType::CellRange(
                                            BaseType::BeginHandle(), cur);
            return maxDepth;
        };
 
private:
        size_t Rebuild(CellType& parent, size_t childIdx, const PointType& min,
                       const PointType& max, typename BaseType::HandleType* cur)
        {
            CellType& cell = parent[childIdx];
            if (this->IsLeaf(cell))
            {
                typename BaseType::HandleType h = *cur;
                if (h >= BaseType::EndHandle())
                {
                    cell.Range() = typename BaseType::CellRange(h, h);
                    return cell.Level();
                }
                size_t s = cell.Size();
                for (size_t i = 0; i < s && h < BaseType::EndHandle(); ++i, ++h)
                {
                    size_t dref = this->Dereference(h);
                    bool inside = true;
                    for (unsigned int j = 0; j < BaseType::m_dim; ++j)
                    {
                        if (BaseType::at(dref)[j] <= min[j] || BaseType::at(dref)[j] > max[j])
                        {
                            inside = false;
                            break;
                        }
                    }
                    if (!inside)
                    {
                        break;
                    }
                }
                cell.Range() = typename BaseType::CellRange(*cur, h);
                *cur = h;
                return cell.Level();
            }
            else
            {
                // rebuild children
                typename BaseType::HandleType start = *cur;
                unsigned int numChilds = 0;
                size_t maxDepth = 0;
                for (unsigned int i = 0; i < CellType::NChildren; ++i)
                {
                    if (!this->ExistChild(cell, i))
                    {
                        continue;
                    }
                    PointType cmin, cmax;
                    for (unsigned int j = 0; j < BaseType::m_dim; ++j)
                    {
                        if (i & (1 << (BaseType::m_dim - j - 1)))
                        {
                            cmin[j] = cell.Center()[j];
                            cmax[j] = max[j];
                        }
                        else
                        {
                            cmin[j] = min[j];
                            cmax[j] = cell.Center()[j];
                        }
                    }
                    size_t d = Rebuild(cell, i, cmin, cmax, cur);
                    if (d > maxDepth)
                    {
                        maxDepth = d;
                    }
                    if (cell[i].Size() == 0)
                    {
                        delete &(cell[i]);
                        cell.Child(i, (CellType*)1);
                    }
                    else
                    {
                        ++numChilds;
                    }
                }
                cell.Range() = typename BaseType::CellRange(start, *cur);
                if (numChilds == 0)
                {
                    cell.Child(0, NULL);
                    maxDepth = cell.Level();
                }
                else if (cell.Size() < BaseType::MaxBucketSize())
                {
                    // make cell a leaf
                    for (unsigned int i = 0; i < CellType::NChildren; ++i)
                    {
                        if (!this->ExistChild(cell, i))
                        {
                            continue;
                        }
                        delete &(cell[i]);
                        cell.Child(i, NULL);
                    }
                    cell.Child(0, NULL);
                    maxDepth = cell.Level();
                }
                return maxDepth;
            }
        }
    };
};
 
#endif