💿🐜 Antkeeper source code
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322 lines
7.0 KiB
322 lines
7.0 KiB
/*
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* Copyright (C) 2023 Christopher J. Howard
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*
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* This file is part of Antkeeper source code.
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*
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* Antkeeper source code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Antkeeper source code is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef ANTKEEPER_GEOM_BREP_FACE_HPP
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#define ANTKEEPER_GEOM_BREP_FACE_HPP
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#include <engine/geom/brep/brep-loop.hpp>
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#include <engine/geom/brep/brep-element-container.hpp>
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#include <cstddef>
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#include <iterator>
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#include <span>
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namespace geom {
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class brep_vertex;
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class brep_loop;
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template <class T>
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class brep_element_container;
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/**
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* List of B-rep loops that bound a common face.
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*/
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class brep_face_loop_list
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{
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public:
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friend class brep_mesh;
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struct const_iterator
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{
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public:
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friend class brep_face_loop_list;
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using iterator_category = std::bidirectional_iterator_tag;
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using iterator_concept = std::bidirectional_iterator_tag;
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using difference_type = std::ptrdiff_t;
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using value_type = brep_loop*;
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using pointer = const value_type*;
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using reference = const value_type&;
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[[nodiscard]] inline constexpr value_type operator*() const noexcept
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{
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return m_loop;
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}
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[[nodiscard]] inline constexpr value_type operator->() const noexcept
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{
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return m_loop;
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}
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inline const_iterator& operator++() noexcept
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{
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m_loop = m_loop->m_face_next;
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++m_position;
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return *this;
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}
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[[nodiscard]] inline const_iterator operator++(int) noexcept
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{
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const_iterator tmp = *this;
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++(*this);
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return tmp;
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}
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inline const_iterator& operator--() noexcept
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{
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m_loop = m_loop->m_face_previous;
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--m_position;
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return *this;
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}
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[[nodiscard]] inline const_iterator operator--(int) noexcept
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{
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const_iterator tmp = *this;
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--(*this);
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return tmp;
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}
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[[nodiscard]] inline bool operator==(const const_iterator& other) const noexcept
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{
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return m_position == other.m_position;
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};
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[[nodiscard]] inline std::weak_ordering operator<=>(const const_iterator& other) const noexcept
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{
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return m_position <=> other.m_position;
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}
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[[nodiscard]] inline difference_type operator-(const const_iterator& rhs) const noexcept
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{
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return m_position - rhs.m_position;
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}
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private:
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brep_loop* m_loop;
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std::ptrdiff_t m_position;
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};
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using const_reverse_iterator = std::reverse_iterator<const_iterator>;
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/// @name Element access
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/// @{
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/// Returns the first loop.
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[[nodiscard]] inline brep_loop* front() const noexcept
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{
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return m_head;
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}
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/// Returns the last loop.
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[[nodiscard]] inline brep_loop* back() const noexcept
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{
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return m_head->m_face_previous;
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}
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/// @}
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/// @name Iterators
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/// @{
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/// Returns an iterator to the first loop.
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/// @{
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[[nodiscard]] inline constexpr const_iterator begin() const noexcept
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{
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const_iterator it;
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it.m_loop = m_head;
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it.m_position = 0;
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return it;
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}
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[[nodiscard]] inline constexpr const_iterator cbegin() const noexcept
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{
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return begin();
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}
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/// @}
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/// Returns an iterator to the loop following the last loop.
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/// @{
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[[nodiscard]] inline constexpr const_iterator end() const noexcept
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{
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const_iterator it;
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it.m_loop = m_head;
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it.m_position = static_cast<std::ptrdiff_t>(m_size);
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return it;
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}
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[[nodiscard]] inline constexpr const_iterator cend() const noexcept
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{
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return end();
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}
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/// @}
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/// Returns a reverse iterator to the first loop of the reversed list.
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/// @{
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[[nodiscard]] inline constexpr const_reverse_iterator rbegin() const noexcept
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{
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return std::make_reverse_iterator(end());
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}
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[[nodiscard]] inline constexpr const_reverse_iterator crbegin() const noexcept
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{
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return rbegin();
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}
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/// @}
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/// Returns a reverse iterator to the loop following the last loop of the reversed list.
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/// @{
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[[nodiscard]] inline constexpr const_reverse_iterator rend() const noexcept
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{
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return std::make_reverse_iterator(begin());
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}
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[[nodiscard]] inline constexpr const_reverse_iterator crend() const noexcept
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{
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return rend();
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}
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/// @}
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/// @}
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/// @name Capacity
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/// @{
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/// Returns `true` if the list is empty, `false` otherwise.
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[[nodiscard]] inline constexpr bool empty() const noexcept
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{
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return !m_size;
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}
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/// Returns the number of loops in the list.
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[[nodiscard]] inline constexpr std::size_t size() const noexcept
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{
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return m_size;
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}
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/// @}
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/// @name Modifiers
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/// @{
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/**
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* Appends a loop to the end of the list.
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*
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* @param loop Pointer to the loop to append.
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*/
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void push_back(brep_loop* loop);
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/**
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* Inserts a loop before a given loop.
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*
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* @param next Loop before which this loop should be inserted.
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* @param loop Pointer to the loop to insert.
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*/
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void insert(brep_loop* next, brep_loop* loop);
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/**
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* Removes an loop from the list.
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*
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* @param loop Pointer to the loop to remove.
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*/
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void remove(brep_loop* loop);
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/// @}
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private:
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brep_loop* m_head{};
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std::size_t m_size{};
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};
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/**
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* Portion of a shell bounded by loops.
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*/
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class brep_face
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{
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public:
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friend class brep_mesh;
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friend class brep_element_container<brep_face>;
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friend class brep_face_container;
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/**
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* Returns the index of this face in the mesh face array.
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*
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* @warning This index may change if any faces are removed from the mesh.
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*/
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[[nodiscard]] inline constexpr std::size_t index() const noexcept
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{
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return m_index;
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}
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/// Returns the list of loops associated with this face.
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[[nodiscard]] inline constexpr const brep_face_loop_list& loops() const noexcept
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{
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return m_loops;
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}
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private:
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std::size_t m_index;
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brep_face_loop_list m_loops;
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};
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/**
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* B-rep face container.
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*/
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class brep_face_container: public brep_element_container<brep_face>
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{
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public:
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/**
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* Appends a new face to the end of the container.
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*
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* @param vertices Ordered vertices of the face.
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*
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* @return Pointer to the new face.
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*/
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brep_face* emplace_back(const std::span<brep_vertex*> vertices);
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/**
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* Erases a face and all of its loops.
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*
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* @param face Pointer to the face to erase.
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*
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* @warning Invalidates iterators and indices of loops and faces.
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*/
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void erase(brep_face* face) override;
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/**
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* Erases all faces and their loops.
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*/
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void clear() noexcept;
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/**
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* Reverses the direction of a face's bounding loops.
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*
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* @param face Face bounded by the loops to reverse.
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*/
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void reverse(brep_face* face);
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private:
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friend class brep_mesh;
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/**
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* Constructs a B-rep face container.
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*
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* @param mesh Pointer to the parent mesh.
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*/
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inline explicit brep_face_container(brep_mesh* mesh) noexcept:
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brep_element_container<brep_face>(mesh)
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{}
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};
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} // namespace geom
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#endif // ANTKEEPER_GEOM_BREP_FACE_HPP
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