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67 lines
1.8 KiB
C++
67 lines
1.8 KiB
C++
#ifndef PRECISIONEVALUATOR_H
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#define PRECISIONEVALUATOR_H
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#include <numeric>
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#include <type_traits>
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#include <vector>
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#include <cmath>
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#include <SFML/System/Clock.hpp>
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using microsec = sf::Int64;
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template<typename Grade, typename = std::enable_if_t<std::is_enum<Grade>::value>>
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class PrecisionEvaluator
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{
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public:
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PrecisionEvaluator(const std::vector<microsec>& intervals, microsec offset) :
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_offset(offset),
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_intervals(intervals)
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{
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microsec&& handling_offset = std::accumulate(intervals.begin(), intervals.end(), 0);
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_start_handling_offset = _offset - handling_offset;
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_end_handling_offset = _offset + handling_offset;
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}
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inline microsec offset() const noexcept
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{
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return _offset;
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}
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inline bool isActive(microsec music_play_offset) const noexcept
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{
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return music_play_offset > _start_handling_offset
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&& music_play_offset < _end_handling_offset;
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}
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inline Grade calculatePrecision(microsec odds) const noexcept
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{
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microsec shift_from_perfect = std::abs(odds - offset());
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std::size_t raw_grade;
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for (raw_grade = 0; raw_grade < _intervals.size(); ++raw_grade)
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{
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if (shift_from_perfect <= _intervals.at(raw_grade))
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break;
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}
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return static_cast<Grade>(raw_grade);
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}
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private:
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microsec _offset;
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microsec _start_handling_offset;
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microsec _end_handling_offset;
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/* Amount of values in enum instanced as GradeS
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* represents capacity of _intervals.
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* So, for each V value in GradeS enum, _intervals[V]
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* should return time shift from V - 1.
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* V0 is PERFECT SCORE and the last V represents the worst
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* grades which is death of note by expiration */
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const std::vector<microsec>& _intervals;
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};
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#endif // PRECISIONEVALUATOR_H
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