flip_shape.hpp

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#ifndef GENERATOR_FLIPSHAPE_HPP
#define GENERATOR_FLIPSHAPE_HPP
 
#include "edge.hpp"
#include "transform_shape.hpp"
 
namespace generator
{
 
template<typename shape_t>
class flip_shape_t
{
private:
    using impl_t = transform_shape_t<shape_t>;
    impl_t transform_shape_;
 
public:
    class edges_t
    {
    public:
        edge_t generate() const
        {
            edge_t edge = edges_.generate();
            std::swap(edge.vertices[0], edge.vertices[1]);
            return edge;
        }
 
        bool done() const noexcept
        {
            return edges_.done();
        }
 
        void next()
        {
            edges_.next();
        }
 
    private:
        typename edge_generator_type<transform_shape_t<shape_t>>::type edges_;
 
        explicit edges_t(const transform_shape_t<shape_t>& shape) : edges_{shape.edges()}
        {
        }
 
        friend class flip_shape_t;
    };
 
    flip_shape_t(shape_t shape)
        : transform_shape_{std::move(shape),
                           [](shape_vertex_t& vertex)
                           {
                               vertex.tangent *= -1.0;
                           }}
    {
    }
 
    edges_t edges() const noexcept
    {
        return edges_t{*this};
    }
 
    using vertices_t = typename impl_t::vertices_t;
 
    vertices_t vertices() const noexcept
    {
        return transform_shape_.vertices();
    }
};
 
template<typename shape_t>
flip_shape_t<shape_t> flip_shape(shape_t shape)
{
    return flip_shape_t<shape_t>{std::move(shape)};
}
} // namespace generator
 
#endif