transform_matrix.h

/*****************************************************************************
 * VCLib                                                                     *
 * Visual Computing Library                                                  *
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 * Copyright(C) 2021-2025                                                    *
 * Visual Computing Lab                                                      *
 * ISTI - Italian National Research Council                                  *
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 * Mozilla Public License Version 2.0                                        *
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#ifndef VCL_MESH_COMPONENTS_TRANSFORM_MATRIX_H
#define VCL_MESH_COMPONENTS_TRANSFORM_MATRIX_H
 
#include "base/component.h"
#include "base/predicates.h"
 
#include <vclib/space/core.h>
 
namespace vcl::comp {
 
template<typename Scalar, typename ParentElemType = void, bool OPT = false>
class TransformMatrix :
        public Component<
            TransformMatrix<Scalar, ParentElemType, OPT>,
            CompId::TRANSFORM_MATRIX,
            Matrix44<Scalar>,
            ParentElemType,
            !std::is_same_v<ParentElemType, void>,
            OPT>
{
    using Base = Component<
        TransformMatrix<Scalar, ParentElemType, OPT>,
        CompId::TRANSFORM_MATRIX,
        Matrix44<Scalar>,
        ParentElemType,
        !std::is_same_v<ParentElemType, void>,
        OPT>;
 
public:
    using TransformMatrixType = Matrix44<Scalar>;
 
    /* Constructors */
 
    TransformMatrix()
    {
        if constexpr (!Base::IS_VERTICAL) {
            init();
        }
    }
 
    void init() { transformMatrix().setIdentity(); }
 
    /* Member functions */
 
    const TransformMatrixType& transformMatrix() const { return Base::data(); }
 
    TransformMatrixType& transformMatrix() { return Base::data(); }
 
protected:
    // Component interface functions
    template<typename Element>
    void importFrom(const Element& e, bool = true);
 
    void serialize(std::ostream& os) const { transformMatrix().serialize(os); }
 
    void deserialize(std::istream& is) { transformMatrix().deserialize(is); }
};
 
/* concept */
 
template<typename T>
concept HasTransformMatrix =
    TTB::IsDerivedFromSpecializationOfV<T, TransformMatrix>;
 
/* importFrom function */
 
template<typename Scalar, typename ParentElemType, bool OPT>
template<typename Element>
void TransformMatrix<Scalar, ParentElemType, OPT>::importFrom(
    const Element& e,
    bool)
{
    if constexpr (HasTransformMatrix<Element>) {
        transformMatrix() = e.transformMatrix().template cast<Scalar>();
    }
}
 
/* Detector function to check if a class has TransformMatrix available */
 
bool isTransformMatrixAvailableOn(const auto& element)
{
    return isComponentAvailableOn<CompId::TRANSFORM_MATRIX>(element);
}
 
/* Specialization Aliases */
 
template<typename ElementType = void, bool OPT = false>
using TransformMatrixf = TransformMatrix<float, ElementType, OPT>;
 
template<typename ElementType = void, bool OPT = false>
using TransformMatrixd = TransformMatrix<double, ElementType, OPT>;
 
} // namespace vcl::comp
 
#endif // VCL_MESH_COMPONENTS_TRANSFORM_MATRIX_H