project-kyoku/include/note.h

#pragma once

#include <vector>
#include <SFML/System/Clock.hpp>
#include <SFML/Graphics/Drawable.hpp>

using microsec = sf::Int64;

class Note : public sf::Drawable
{
public:
    explicit Note(microsec perfect_offset) :
        _perfect_offset(perfect_offset) {}
    virtual ~Note() = default;

    virtual bool isActive(const microsec& music_offset) const = 0;
    virtual void update(const microsec& music_offset) = 0;
    virtual void draw(sf::RenderTarget& target, sf::RenderStates states) const = 0;

    virtual microsec offset() const
    {
        return _perfect_offset;
    }

protected:
    microsec _perfect_offset;
};