colors.h

/*****************************************************************************
 * VCLib                                                                     *
 * Visual Computing Library                                                  *
 *                                                                           *
 * Copyright(C) 2021-2025                                                    *
 * Visual Computing Lab                                                      *
 * ISTI - Italian National Research Council                                  *
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the              *
 * Mozilla Public License Version 2.0                                        *
 * (https://www.mozilla.org/en-US/MPL/2.0/) for more details.                *
 ****************************************************************************/
 
#ifndef VCL_VIEWS_MESH_COMPONENTS_COLORS_H
#define VCL_VIEWS_MESH_COMPONENTS_COLORS_H
 
#include <vclib/concepts/mesh.h>
#include <vclib/concepts/pointers.h>
#include <vclib/types.h>
 
#include <ranges>
 
namespace vcl::views {
 
namespace detail {
 
inline constexpr auto color = [](auto&& p) -> decltype(auto) {
    if constexpr (IsPointer<decltype(p)>)
        return p->color();
    else
        return p.color();
};
 
struct ColorsView
{
    constexpr ColorsView() = default;
 
    template<std::ranges::range R>
    friend constexpr auto operator|(R&& r, ColorsView)
    {
        return std::forward<R>(r) | std::views::transform(color);
    }
 
    template<comp::HasWedgeColors R>
    friend constexpr auto operator|(R&& r, ColorsView)
    {
        if constexpr (IsPointer<R>)
            return r->wedgeColors();
        else
            return r.wedgeColors();
    }
};
 
} // namespace detail
 
inline constexpr detail::ColorsView colors;
 
} // namespace vcl::views
 
#endif // VCL_VIEWS_MESH_COMPONENTS_COLORS_H