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93 lines
2.9 KiB
C++
93 lines
2.9 KiB
C++
/*
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* Scale.h - holds information about a scale and its intervals
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*
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* Copyright (c) 2020 Martin Pavelek <he29.HS/at/gmail.com>
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*
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* This file is part of LMMS - https://lmms.io
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program 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 GNU
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* 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
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* License along with this program (see COPYING); if not, write to the
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* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA.
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*
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*/
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#ifndef LMMS_SCALE_H
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#define LMMS_SCALE_H
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#include <cstdint>
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#include <vector>
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#include <QObject>
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#include <QString>
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#include "SerializingObject.h"
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namespace lmms
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{
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class Interval : public SerializingObject
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{
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public:
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Interval() : m_numerator(1), m_denominator(1), m_cents(0), m_ratio(1) {};
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explicit Interval(float cents);
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Interval(uint32_t numerator, uint32_t denominator);
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float getRatio() const {return m_ratio;}
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QString getString() const
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{
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if (m_denominator) {return QString::number(m_numerator) + "/" + QString::number(m_denominator);}
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else {return QString("%1").arg(m_cents, 0, 'f', 4);}
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}
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void saveSettings(QDomDocument &doc, QDomElement &element) override;
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void loadSettings(const QDomElement &element) override;
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inline QString nodeName() const override {return "interval";}
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private:
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// Scala specifies that numerators and denominators should go at least up to 2147483647 → use uint32_t.
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uint32_t m_numerator; //!< numerator of the interval fraction
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uint32_t m_denominator; //!< denominator of the interval fraction
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float m_cents; //!< interval defined in cents (used when denominator is set to zero)
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float m_ratio; //!< precomputed output value for better performance
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};
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class Scale : public QObject, public SerializingObject
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{
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Q_OBJECT
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public:
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Scale();
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Scale(QString description, std::vector<Interval> intervals);
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QString getDescription() const;
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void setDescription(QString description);
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const std::vector<Interval> &getIntervals() const {return m_intervals;}
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void setIntervals(std::vector<Interval> input) {m_intervals = std::move(input);}
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void saveSettings(QDomDocument &doc, QDomElement &element) override;
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void loadSettings(const QDomElement &element) override;
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inline QString nodeName() const override {return "scale";}
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private:
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QString m_description; //!< name or description of the scale
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std::vector<Interval> m_intervals; //!< a series of ratios that define the scale
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};
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} // namespace lmms
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#endif // LMMS_SCALE_H
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