TransformPath.hpp

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//
//  CeresEngine - A game development framework
//
//  Created by Rogiel Sulzbach.
//  Copyright (c) 2018-2022 Rogiel Sulzbach. All rights reserved.
//
 
#pragma once
 
#include "PathVertex.hpp"
#include "Utility.hpp"
 
#include "CeresEngine/Foundation/Function.hpp"
 
namespace CeresEngine::MeshGenerator {
 
    template<typename Path> class TransformPath {
    private:
        using Impl = Path;
        Impl mPath;
 
    public:
        class Vertices {
        public:
            PathVertex generate() const {
                auto vertex = vertices_.generate();
                mPath->mutate_(vertex);
                return vertex;
            }
 
            [[nodiscard]] bool done() const noexcept { return vertices_.done(); }
 
            void next() { vertices_.next(); }
 
        private:
            Vertices(const TransformPath& path) : mPath{&path}, vertices_{path.mPath.vertices()} {}
 
            const TransformPath* mPath;
 
            typename VertexGeneratorType<Path>::Type vertices_;
 
            friend class TransformPath;
        };
 
        TransformPath(Path path, Function<void(PathVertex&) const> mutate) : mPath{std::move(path)}, mutate_{mutate} {}
 
        [[nodiscard]] Vertices vertices() const noexcept { return *this; }
 
        using Edges = typename Impl::Edges;
 
        [[nodiscard]] Edges edges() const noexcept { return mPath.edges(); }
 
    private:
        Function<void(PathVertex&) const> mutate_;
    };
 
    template<typename Path> TransformPath<Path> transformPath(Path path, Function<void(PathVertex&) const> mutate) {
        return TransformPath<Path>{std::move(path), std::move(mutate)};
    }
 
} // namespace CeresEngine::MeshGenerator