BoundingBoxWrapper.hpp

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#pragma once
#include <fishnet/IGeometry.hpp>
#include <fishnet/Rectangle.hpp>
#include <fishnet/NumericConcepts.hpp>
namespace fishnet::geometry {
 
template<typename T, class ShapeProjection=std::identity> requires fishnet::geometry::Shape<std::invoke_result_t<ShapeProjection,T>>
class BoundingBoxWrapper {
private:
    const T element; 
    Rectangle<fishnet::math::DEFAULT_NUMERIC> boundingBox;
    static inline ShapeProjection shapeProjection{};
public:
    using element_type = T;
    using geometry_type = std::invoke_result_t<ShapeProjection,T>;
    BoundingBoxWrapper(const T & element):element(element),boundingBox(shapeProjection(element)){}
 
    BoundingBoxWrapper(const T & element, const Rectangle<fishnet::math::DEFAULT_NUMERIC> & boundingBox):element(element),boundingBox(boundingBox){}
 
    const Rectangle<fishnet::math::DEFAULT_NUMERIC> & getBoundingBox() const noexcept {
        return this->boundingBox;
    }
 
    auto getPolygon() const noexcept {
        return shapeProjection(this->element);
    }
 
    const T & getElement() const noexcept {
        return this->element;
    }
};
 
template<typename T>
concept IBoundingBoxWrapper = requires(T t){
    {t.getBoundingBox()} -> std::convertible_to<Rectangle<fishnet::math::DEFAULT_NUMERIC>>;
    {t.getPolygon()} -> fishnet::geometry::Shape;
    typename T::element_type;
    typename T::geometry_type;
};
 
template<IBoundingBoxWrapper BBWrapper>
struct VerticalAABBOrdering{
    bool operator()(const BBWrapper & lhs, const BBWrapper & rhs) const noexcept {
        return lhs.getBoundingBox().top() > rhs.getBoundingBox().top();
    }
};
 
template<IBoundingBoxWrapper BBWrapper>
struct HorizontalAABBOrdering {
    bool operator()(const BBWrapper & lhs, const BBWrapper & rhs) const noexcept {
        if(lhs.getBoundingBox().left() == rhs.getBoundingBox().left()){
            return lhs.getBoundingBox().right() < rhs.getBoundingBox().right();
        }
        return lhs.getBoundingBox().left() < rhs.getBoundingBox().left();
    }
};
}