💿🐜 Antkeeper source code
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202 lines
5.0 KiB
202 lines
5.0 KiB
/*
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* Copyright (C) 2021 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_ANIMATION_CHANNEL_HPP
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#define ANTKEEPER_ANIMATION_CHANNEL_HPP
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#include <list>
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#include <set>
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#include <tuple>
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/**
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* Single channel in a keyframe animation.
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*
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* @see animation
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*/
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template <typename T>
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class animation_channel
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{
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public:
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/// Keyframe consisting of a time and a value.
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typedef std::tuple<double, T> keyframe;
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/**
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* Creates an animation channel.
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*
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* @param id ID of the channel.
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*/
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animation_channel(int id);
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/// Creates an animation channel.
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animation_channel();
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/// Creates an animation channel.
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animation_channel(const animation_channel& other);
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/// Assigns the contents of another channel to this channel.
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animation_channel& operator=(const animation_channel& other);
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/**
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* Adds a keyframe to the animation.
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*
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* @param k Keyframe to add.
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*/
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void insert_keyframe(const keyframe& k);
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/**
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* Removes all keyframes on `[start, end)`.
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*
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* @param start Starting position in time (inclusive).
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* @param end Ending position in time (non-inclusive).
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*/
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void remove_keyframes(double start, double end);
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/// Removes all keyframes from the animation.
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void remove_keyframes();
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/**
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* Finds the keyframes to the left and right of @p position.
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*
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* @param position Position in time.
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* @return Array containing the the keyframes on the left and right of @p position.
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*/
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std::array<const keyframe*, 2> find_keyframes(double position) const;
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/**
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* Finds all the keyframes on `[start, end)`.
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*
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* @param start Starting position in time (inclusive).
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* @param end Ending position in time (non-inclusive).
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* @return All keyframes on `[start, end)`.
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*/
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std::list<keyframe> find_keyframes(double start, double end) const;
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/// Returns the ID of the animation channel.
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int get_id() const;
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/// Returns the duration of the animation channel.
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double get_duration() const;
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private:
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struct keyframe_compare
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{
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inline bool operator()(const keyframe& lhs, const keyframe& rhs) const
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{
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return std::get<0>(lhs) < std::get<0>(rhs);
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}
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};
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int id;
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std::set<keyframe, keyframe_compare> keyframes;
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};
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template <typename T>
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animation_channel<T>::animation_channel(int id):
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id(id),
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keyframes(keyframe_compare())
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{}
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template <typename T>
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animation_channel<T>::animation_channel():
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animation_channel(-1)
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{}
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template <typename T>
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animation_channel<T>::animation_channel(const animation_channel& other):
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id(other.id),
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keyframes(other.keyframes)
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{}
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template <typename T>
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animation_channel<T>& animation_channel<T>::operator=(const animation_channel& other)
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{
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id = other.id;
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keyframes = other.keyframes;
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}
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template <typename T>
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void animation_channel<T>::insert_keyframe(const keyframe& k)
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{
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keyframes.emplace(k);
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}
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template <typename T>
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void animation_channel<T>::remove_keyframes(double start, double end)
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{
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auto lower_bound = keyframes.lower_bound({start, T()});
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auto upper_bound = keyframes.upper_bound({end, T()});
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keyframes.erase(lower_bound, upper_bound);
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}
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template <typename T>
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void animation_channel<T>::remove_keyframes()
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{
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keyframes.clear();
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}
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template <typename T>
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std::array<const typename animation_channel<T>::keyframe*, 2> animation_channel<T>::find_keyframes(double position) const
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{
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// Find the following keyframe
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auto upper_bound = keyframes.upper_bound({position, T()});
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// Find the preceding keyframe
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auto lower_bound = upper_bound;
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--lower_bound;
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std::array<const keyframe*, 2> frames;
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frames[0] = (lower_bound != keyframes.end()) ? &(*lower_bound) : nullptr;
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frames[1] = (upper_bound != keyframes.end()) ? &(*upper_bound) : nullptr;
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return frames;
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}
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template <typename T>
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std::list<typename animation_channel<T>::keyframe> animation_channel<T>::find_keyframes(double start, double end) const
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{
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std::list<keyframe> keyframe_list;
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auto lower_bound = keyframes.lower_bound({start, T()});
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auto upper_bound = keyframes.upper_bound({end, T()});
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for (auto iterator = lower_bound; iterator != upper_bound; ++iterator)
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{
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keyframe_list.push_back(*iterator);
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}
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return keyframe_list;
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}
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template <typename T>
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inline int animation_channel<T>::get_id() const
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{
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return id;
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}
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template <typename T>
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double animation_channel<T>::get_duration() const
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{
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if (keyframes.empty())
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{
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return 0.0;
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}
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return std::get<0>(*keyframes.rbegin());
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}
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#endif // ANTKEEPER_ANIMATION_CHANNEL_HPP
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