CoordRangeTransform.hpp

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// -------------------------------------------------------//
//
// SHAMROCK code for hydrodynamics
// Copyright (c) 2021-2026 Timothée David--Cléris <tim.shamrock@proton.me>
// SPDX-License-Identifier: CeCILL Free Software License Agreement v2.1
// Shamrock is licensed under the CeCILL 2.1 License, see LICENSE for more information
//
// -------------------------------------------------------//
 
#pragma once

 
#include "CoordRange.hpp"
#include "shambackends/math.hpp"
#include "shambackends/vec.hpp"
 
namespace shammath {
 
    template<class Tsource, class Tdest>
    class CoordRangeTransform {
 
        using SourceProp = shambase::VectorProperties<Tsource>;
        using DestProp   = shambase::VectorProperties<Tdest>;
 
        using component_source_t = typename SourceProp::component_type;
        using component_dest_t   = typename DestProp::component_type;
 
        static constexpr bool source_is_int = SourceProp::is_uint_based;
 
        static constexpr bool dest_is_int = SourceProp::is_uint_based;
 
        enum TransformFactMode { multiply, divide };
 
        // written as Patch->Coord transform
        Tdest fact;
 
        Tdest dest_coord_min;
        Tsource source_coord_min;
 
        TransformFactMode mode;
 
        public:
        static_assert(
            SourceProp::dimension == DestProp::dimension,
            "input and output dimensions should be the same");
 
        CoordRangeTransform(CoordRange<Tsource> source_range, CoordRange<Tdest> dest_range);
 
        CoordRange<Tdest> transform(CoordRange<Tsource> rnge) const;
        CoordRange<Tsource> reverse_transform(CoordRange<Tdest> rnge) const;
 
        Tdest transform(Tsource coord) const;
        Tsource reverse_transform(Tdest rnge) const;
 
        void print_transform() const;
    };

    // out of line impl
 
    template<class Tsource, class Tdest>
    inline CoordRange<Tdest> CoordRangeTransform<Tsource, Tdest>::transform(
        CoordRange<Tsource> rnge) const {
 
        Tsource pmin = rnge.lower;
        Tsource pmax = rnge.upper;
 
        if (mode == multiply) {
            return {
                sham::convert<Tdest>(pmin - source_coord_min) * fact + dest_coord_min,
                sham::convert<Tdest>(pmax - source_coord_min) * fact + dest_coord_min};
        } else {
            return {
                sham::convert<Tdest>(pmin - source_coord_min) / fact + dest_coord_min,
                sham::convert<Tdest>(pmax - source_coord_min) / fact + dest_coord_min};
        }
    }
 
    template<class Tsource, class Tdest>
    inline CoordRange<Tsource> CoordRangeTransform<Tsource, Tdest>::reverse_transform(
        CoordRange<Tdest> rnge) const {
 
        Tsource pmin;
        Tsource pmax;
 
        if (mode == multiply) {
            return {
                sham::convert<Tsource>((rnge.lower - dest_coord_min) / fact) + source_coord_min,
                sham::convert<Tsource>((rnge.upper - dest_coord_min) / fact) + source_coord_min};
        } else {
            return {
                sham::convert<Tsource>((rnge.lower - dest_coord_min) * fact) + source_coord_min,
                sham::convert<Tsource>((rnge.upper - dest_coord_min) * fact) + source_coord_min};
        }
    }
 
    template<class Tsource, class Tdest>
    inline Tdest CoordRangeTransform<Tsource, Tdest>::transform(Tsource coord) const {
 
        if (mode == multiply) {
            return sham::convert<Tdest>(coord - source_coord_min) * fact + dest_coord_min;
        } else {
            return sham::convert<Tdest>(coord - source_coord_min) / fact + dest_coord_min;
        }
    }
 
    template<class Tsource, class Tdest>
    inline Tsource CoordRangeTransform<Tsource, Tdest>::reverse_transform(Tdest coord) const {
 
        if (mode == multiply) {
            return sham::convert<Tsource>((coord - dest_coord_min) / fact) + source_coord_min;
        } else {
            return sham::convert<Tsource>((coord - dest_coord_min) * fact) + source_coord_min;
        }
    }
 
} // namespace shammath