RegularSpatialGrid.hpp

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/* 
 * RegularSpatialGrid.hpp 
 *
 * Copyright (C) 2003 Thomas Seidel <thomas.seidel@univie.ac.at>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; see the file COPYING. If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */
 
#ifndef CDPL_MATH_REGULARSPATIALGRID_HPP
#define CDPL_MATH_REGULARSPATIALGRID_HPP
 
#include <type_traits>
#include <utility>
#include <memory>
 
#include "CDPL/Math/GridExpression.hpp"
#include "CDPL/Math/Grid.hpp"
#include "CDPL/Math/Matrix.hpp"
#include "CDPL/Math/Vector.hpp"
#include "CDPL/Math/TypeTraits.hpp"
#include "CDPL/Base/Exceptions.hpp"
 
namespace CDPL
{
 
    namespace Math
    {
 
        template <typename MatrixType>
        struct GridCoordinatesMatrixTransformTraits
        {
 
            static void init(MatrixType& mtx)
            {
                mtx.assign(IdentityMatrix<typename MatrixType::ValueType>(4, 4));
            }
 
            template <typename M>
            static bool invert(const MatrixType& mtx, M& inv_mtx)
            {
                return Math::invert(mtx, inv_mtx);
            }
 
            template <typename V, typename R>
            static void transform(const MatrixType& mtx, const V& v, R& r)
            {
                prod(mtx, v, r);
            }
        };
 
        template <typename T>
        struct GridCoordinatesTransformTraits;
 
        template <typename T>
        struct GridCoordinatesTransformTraits<CMatrix<T, 4, 4> > : public GridCoordinatesMatrixTransformTraits<CMatrix<T, 4, 4> >
        {};
 
        template <typename T>
        struct GridCoordinatesTransformTraits<BoundedMatrix<T, 4, 4> > : public GridCoordinatesMatrixTransformTraits<BoundedMatrix<T, 4, 4> >
        {};
 
 
        template <typename T, typename C = typename TypeTraits<T>::RealType, typename GD = Grid<T>, typename XF = CMatrix<C, 4, 4> >
        class RegularSpatialGrid : public GridExpression<RegularSpatialGrid<T, C, GD, XF> >
        {
 
            typedef RegularSpatialGrid<T, C, GD, XF> SelfType;
 
          public:
            typedef T                                                       ValueType;
            typedef C                                                       CoordinatesValueType;
            typedef GD                                                      GridDataType;
            typedef XF                                                      CoordinatesTransformType;
            typedef typename CoordinatesTransformType::MatrixTemporaryType  InvCoordinatesTransformType;
            typedef typename std::conditional<std::is_const<GD>::value,
                                              typename GD::ConstReference,
                                              typename GD::Reference>::type Reference;
            typedef typename GD::ConstReference                             ConstReference;
            typedef typename GD::SizeType                                   SizeType;
            typedef std::ptrdiff_t                                          SSizeType;
            typedef typename GD::DifferenceType                             DifferenceType;
            typedef SelfType                                                ClosureType;
            typedef const SelfType                                          ConstClosureType;
            typedef std::shared_ptr<SelfType>                               SharedPointer;
 
            RegularSpatialGrid(const CoordinatesValueType& xs, const CoordinatesValueType& ys, const CoordinatesValueType& zs):
                xStep(xs), yStep(ys), zStep(zs)
            {
 
                GridCoordinatesTransformTraits<CoordinatesTransformType>::init(xform);
                GridCoordinatesTransformTraits<InvCoordinatesTransformType>::init(invXform);
            }
 
            RegularSpatialGrid(const GridDataType& data, const CoordinatesValueType& xs, const CoordinatesValueType& ys, const CoordinatesValueType& zs):
                data(data), xStep(xs), yStep(ys), zStep(zs)
            {
 
                GridCoordinatesTransformTraits<CoordinatesTransformType>::init(xform);
                GridCoordinatesTransformTraits<InvCoordinatesTransformType>::init(invXform);
            }
 
            explicit RegularSpatialGrid(const CoordinatesValueType& s):
                xStep(s), yStep(s), zStep(s)
            {
 
                GridCoordinatesTransformTraits<CoordinatesTransformType>::init(xform);
                GridCoordinatesTransformTraits<InvCoordinatesTransformType>::init(invXform);
            }
 
            RegularSpatialGrid(const GridDataType& data, const CoordinatesValueType& s):
                data(data), xStep(s), yStep(s), zStep(s)
            {
 
                GridCoordinatesTransformTraits<CoordinatesTransformType>::init(xform);
                GridCoordinatesTransformTraits<InvCoordinatesTransformType>::init(invXform);
            }
 
            RegularSpatialGrid(const RegularSpatialGrid& usg):
                data(usg.data), xStep(usg.xStep), yStep(usg.yStep), zStep(usg.zStep),
                xform(usg.xform), invXform(usg.invXform) {}
 
            RegularSpatialGrid(RegularSpatialGrid&& usg):
                data(std::move(usg.data)), xStep(usg.xStep), yStep(usg.yStep), zStep(usg.zStep),
                xform(usg.xform), invXform(usg.invXform) {}
 
            virtual ~RegularSpatialGrid() {}
 
            Reference operator()(SizeType i)
            {
                return data(i);
            }
 
            ConstReference operator()(SizeType i) const
            {
                return data(i);
            }
 
            Reference operator()(SizeType i, SizeType j, SizeType k)
            {
                return data(i, j, k);
            }
 
            ConstReference operator()(SizeType i, SizeType j, SizeType k) const
            {
                return data(i, j, k);
            }
 
            SizeType getSize() const
            {
                return data.getSize();
            }
 
            SizeType getSize1() const
            {
                return data.getSize1();
            }
 
            SizeType getSize2() const
            {
                return data.getSize2();
            }
 
            SizeType getSize3() const
            {
                return data.getSize3();
            }
 
            SizeType getMaxSize() const
            {
                return data.getMaxSize();
            }
 
            SizeType getMaxSize1() const
            {
                return data.getMaxSize1();
            }
 
            SizeType getMaxSize2() const
            {
                return data.getMaxSize2();
            }
 
            SizeType getMaxSize3() const
            {
                return data.getMaxSize3();
            }
 
            CoordinatesValueType getXStepSize() const
            {
                return xStep;
            }
 
            CoordinatesValueType getYStepSize() const
            {
                return yStep;
            }
 
            CoordinatesValueType getZStepSize() const
            {
                return zStep;
            }
 
            void setXStepSize(const CoordinatesValueType& xs)
            {
                xStep = xs;
            }
 
            void setYStepSize(const CoordinatesValueType& ys)
            {
                yStep = ys;
            }
 
            void setZStepSize(const CoordinatesValueType& zs)
            {
                zStep = zs;
            }
 
            CoordinatesValueType getXExtent() const
            {
                return ((data.getSize1() <= 1 ? SizeType(0) : (data.getSize1() - 1)) * xStep);
            }
 
            CoordinatesValueType getYExtent() const
            {
                return ((data.getSize2() <= 1 ? SizeType(0) : (data.getSize2() - 1)) * yStep);
            }
 
            CoordinatesValueType getZExtent() const
            {
                return ((data.getSize3() <= 1 ? SizeType(0) : (data.getSize3() - 1)) * zStep);
            }
 
            template <typename V>
            void getCoordinates(SizeType i, V& coords) const
            {
                SizeType z  = i / (getSize1() * getSize2());
                SizeType xy = i % (getSize1() * getSize2());
                SizeType y  = xy / getSize1();
                SizeType x  = xy % getSize1();
 
                getCoordinates(x, y, z, coords);
            }
 
            template <typename V>
            void getCoordinates(SSizeType i, SSizeType j, SSizeType k, V& coords) const
            {
                CVector<CoordinatesValueType, 4> local_coords;
 
                getLocalCoordinates(i, j, k, local_coords);
                local_coords(3) = CoordinatesValueType(1);
 
                CVector<CoordinatesValueType, 4> world_coords;
                GridCoordinatesTransformTraits<CoordinatesTransformType>::transform(xform, local_coords, world_coords);
 
                coords[0] = world_coords(0);
                coords[1] = world_coords(1);
                coords[2] = world_coords(2);
            }
 
            template <typename V>
            void getLocalCoordinates(SSizeType i, SSizeType j, SSizeType k, V& coords) const
            {
                coords[0] = i * xStep - getXExtent() * CoordinatesValueType(0.5);
                coords[1] = j * yStep - getYExtent() * CoordinatesValueType(0.5);
                coords[2] = k * zStep - getZExtent() * CoordinatesValueType(0.5);
            }
 
            template <typename V1, typename V2>
            void getLocalCoordinates(const V1& world_coords, V2& local_coords) const
            {
                CVector<CoordinatesValueType, 4> tmp_local_coords;
 
                transformToLocalCoordinates(world_coords, tmp_local_coords);
 
                local_coords[0] = tmp_local_coords[0];
                local_coords[1] = tmp_local_coords[1];
                local_coords[2] = tmp_local_coords[2];
            }
 
            template <typename V>
            bool containsPoint(const V& pos) const
            {
                CVector<CoordinatesValueType, 4> local_coords;
 
                transformToLocalCoordinates(pos, local_coords);
 
                return containsLocalPoint(local_coords);
            }
 
            template <typename V>
            bool containsLocalPoint(const V& pos) const
            {
                if (CoordinatesValueType(pos[0]) >= (getXExtent() * CoordinatesValueType(0.5)))
                    return false;
 
                if (CoordinatesValueType(pos[1]) >= (getYExtent() * CoordinatesValueType(0.5)))
                    return false;
 
                if (CoordinatesValueType(pos[2]) >= (getZExtent() * CoordinatesValueType(0.5)))
                    return false;
 
                if (CoordinatesValueType(pos[0]) < (-getXExtent() * CoordinatesValueType(0.5)))
                    return false;
 
                if (CoordinatesValueType(pos[1]) < (-getYExtent() * CoordinatesValueType(0.5)))
                    return false;
 
                if (CoordinatesValueType(pos[2]) < (-getZExtent() * CoordinatesValueType(0.5)))
                    return false;
 
                return true;
            }
 
            template <typename V1, typename V2>
            void getContainingCell(const V1& pos, V2& indices) const
            {
                CVector<CoordinatesValueType, 4> local_coords;
 
                transformToLocalCoordinates(pos, local_coords);
 
                getLocalContainingCell(local_coords, indices);
            }
 
            template <typename V1, typename V2>
            void getLocalContainingCell(const V1& pos, V2& indices) const
            {
                CoordinatesValueType x = pos[0] + getXExtent() * CoordinatesValueType(0.5);
                CoordinatesValueType y = pos[1] + getYExtent() * CoordinatesValueType(0.5);
                CoordinatesValueType z = pos[2] + getZExtent() * CoordinatesValueType(0.5);
 
                indices[0] = SSizeType(std::floor(x / xStep));
                indices[1] = SSizeType(std::floor(y / yStep));
                indices[2] = SSizeType(std::floor(z / zStep));
            }
 
            bool isEmpty() const
            {
                return data.isEmpty();
            }
 
            const GridDataType& getData() const
            {
                return data;
            }
 
            GridDataType& getData()
            {
                return data;
            }
 
            const CoordinatesTransformType& getCoordinatesTransform() const
            {
                return xform;
            }
 
            template <typename T1>
            void setCoordinatesTransform(const T1& xform)
            {
                this->xform = xform;
#ifdef CDPL_MATH_CHECKS_DISABLE
                GridCoordinatesTransformTraits<CoordinatesTransformType>::invert(xform, invXform);
#else
                CDPL_MATH_CHECK(GridCoordinatesTransformTraits<CoordinatesTransformType>::invert(xform, invXform), "Inversion of transformation failed", Base::CalculationFailed);
#endif // CDPL_MATH_CHECKS_DISABLE
            }
 
            RegularSpatialGrid& operator=(const RegularSpatialGrid& usg)
            {
                data     = usg.data;
                xform    = usg.xform;
                invXform = usg.invXform;
                xStep    = usg.xStep;
                yStep    = usg.yStep;
                zStep    = usg.zStep;
                return *this;
            }
 
            RegularSpatialGrid& operator=(RegularSpatialGrid&& usg)
            {
                data     = std::move(usg.data);
                xform    = usg.xform;
                invXform = usg.invXform;
                xStep    = usg.xStep;
                yStep    = usg.yStep;
                zStep    = usg.zStep;
                return *this;
            }
 
            template <typename E>
            RegularSpatialGrid& operator=(const GridExpression<E>& e)
            {
                data.operator=(e);
                return *this;
            }
 
            template <typename E>
            RegularSpatialGrid& operator+=(const GridExpression<E>& e)
            {
                data.operator+=(e);
                return *this;
            }
 
            template <typename E>
            RegularSpatialGrid& operator-=(const GridExpression<E>& e)
            {
                data.operator-=(e);
                return *this;
            }
 
            template <typename T1>
            typename std::enable_if<IsScalar<T>::value, RegularSpatialGrid>::type& operator*=(const T1& t)
            {
                data.operator*=(t);
                return *this;
            }
 
            template <typename T1>
            typename std::enable_if<IsScalar<T>::value, RegularSpatialGrid>::type& operator/=(const T1& t)
            {
                data.operator/=(t);
                return *this;
            }
 
            template <typename E>
            RegularSpatialGrid& assign(const GridExpression<E>& e)
            {
                data.assign(e);
                return *this;
            }
 
            template <typename E>
            RegularSpatialGrid& plusAssign(const GridExpression<E>& e)
            {
                data.plusAssign(e);
                return *this;
            }
 
            template <typename E>
            RegularSpatialGrid& minusAssign(const GridExpression<E>& e)
            {
                data.minusAssign(e);
                return *this;
            }
 
            void swap(RegularSpatialGrid& usg)
            {
                data.swap(usg.data);
                xform.swap(usg.xform);
                invXform.swap(usg.invXform);
                std::swap(xStep, usg.xStep);
                std::swap(yStep, usg.yStep);
                std::swap(zStep, usg.zStep);
            }
 
            friend void swap(RegularSpatialGrid& usg1, RegularSpatialGrid& usg2)
            {
                usg1.swap(usg2);
            }
 
            void clear(const ValueType& v = ValueType())
            {
                data.clear(v);
            }
 
            void resize(SizeType m, SizeType n, SizeType o, bool preserve = true, const ValueType& v = ValueType())
            {
                data.resize(m, n, o, preserve, v);
            }
 
          private:
            template <typename V1, typename V2>
            void transformToLocalCoordinates(const V1& coords, V2& local_coords) const
            {
                CVector<CoordinatesValueType, 4> world_coords;
 
                world_coords(0) = coords[0];
                world_coords(1) = coords[1];
                world_coords(2) = coords[2];
                world_coords(3) = CoordinatesValueType(1);
 
                GridCoordinatesTransformTraits<InvCoordinatesTransformType>::transform(invXform, world_coords, local_coords);
            }
 
            GridDataType                data;
            CoordinatesValueType        xStep;
            CoordinatesValueType        yStep;
            CoordinatesValueType        zStep;
            CoordinatesTransformType    xform;
            InvCoordinatesTransformType invXform;
        };
 
        template <typename T, typename C, typename GD, typename XF, typename V>
        T interpolateTrilinear(const RegularSpatialGrid<T, C, GD, XF>& grid, const V& pos, bool local_pos)
        {
            typedef RegularSpatialGrid<T, C, GD, XF> GridType;
 
            typedef typename GridType::CoordinatesValueType CoordinatesValueType;
            typedef typename GridType::SSizeType            SSizeType;
            typedef typename GridType::ValueType            ValueType;
 
            if (grid.isEmpty())
                return CoordinatesValueType();
 
            CoordinatesValueType loc_pos[3];
 
            if (local_pos) {
                loc_pos[0] = pos[0];
                loc_pos[1] = pos[1];
                loc_pos[2] = pos[2];
 
            } else
                grid.getLocalCoordinates(pos, loc_pos);
 
            SSizeType inds[3];
 
            grid.getLocalContainingCell(loc_pos, inds);
 
            CoordinatesValueType xyz0[3];
 
            grid.getLocalCoordinates(inds[0], inds[1], inds[2], xyz0);
 
            SSizeType inds_p1[3];
 
            inds_p1[0] = inds[0] + 1;
            inds_p1[1] = inds[1] + 1;
            inds_p1[2] = inds[2] + 1;
 
            inds[0] = std::max(SSizeType(0), inds[0]);
            inds[1] = std::max(SSizeType(0), inds[1]);
            inds[2] = std::max(SSizeType(0), inds[2]);
 
            inds[0] = std::min(SSizeType(grid.getSize1() - 1), inds[0]);
            inds[1] = std::min(SSizeType(grid.getSize2() - 1), inds[1]);
            inds[2] = std::min(SSizeType(grid.getSize3() - 1), inds[2]);
 
            inds_p1[0] = std::max(SSizeType(0), inds_p1[0]);
            inds_p1[1] = std::max(SSizeType(0), inds_p1[1]);
            inds_p1[2] = std::max(SSizeType(0), inds_p1[2]);
 
            inds_p1[0] = std::min(SSizeType(grid.getSize1() - 1), inds_p1[0]);
            inds_p1[1] = std::min(SSizeType(grid.getSize2() - 1), inds_p1[1]);
            inds_p1[2] = std::min(SSizeType(grid.getSize3() - 1), inds_p1[2]);
 
            CoordinatesValueType xd = (loc_pos[0] - xyz0[0]) / grid.getXStepSize();
            CoordinatesValueType yd = (loc_pos[1] - xyz0[1]) / grid.getYStepSize();
            CoordinatesValueType zd = (loc_pos[2] - xyz0[2]) / grid.getZStepSize();
 
            ValueType c00 = grid(inds[0], inds[1], inds[2]) * (1 - xd) + grid(inds_p1[0], inds[1], inds[2]) * xd;
            ValueType c01 = grid(inds[0], inds[1], inds_p1[2]) * (1 - xd) + grid(inds_p1[0], inds[1], inds_p1[2]) * xd;
            ValueType c10 = grid(inds[0], inds_p1[1], inds[2]) * (1 - xd) + grid(inds_p1[0], inds_p1[1], inds[2]) * xd;
            ValueType c11 = grid(inds[0], inds_p1[1], inds_p1[2]) * (1 - xd) + grid(inds_p1[0], inds_p1[1], inds_p1[2]) * xd;
 
            ValueType c0 = c00 * (1 - yd) + c10 * yd;
            ValueType c1 = c01 * (1 - yd) + c11 * yd;
 
            ValueType c = c0 * (1 - zd) + c1 * zd;
 
            return c;
        }
 
        typedef RegularSpatialGrid<float> FRegularSpatialGrid;
 
        typedef RegularSpatialGrid<double> DRegularSpatialGrid;
    } // namespace Math
} // namespace CDPL
 
#endif // CDPL_MATH_REGULARSPATIALGRID_HPP