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// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#ifndef SPECTROGRAPH_H
#define SPECTROGRAPH_H
#include "frequencyspectrum.h"
#include <QWidget>
/**
* Widget which displays a spectrograph showing the frequency spectrum
* of the window of audio samples most recently analyzed by the Engine.
*/
class Spectrograph : public QWidget
{
Q_OBJECT
public:
explicit Spectrograph(QWidget *parent = nullptr);
~Spectrograph();
void setParams(int numBars, qreal lowFreq, qreal highFreq);
// QObject
void timerEvent(QTimerEvent *event) override;
// QWidget
void paintEvent(QPaintEvent *event) override;
void mousePressEvent(QMouseEvent *event) override;
signals:
void infoMessage(const QString &message, int intervalMs);
public slots:
void reset();
void spectrumChanged(const FrequencySpectrum &spectrum);
private:
int barIndex(qreal frequency) const;
QPair<qreal, qreal> barRange(int barIndex) const;
void updateBars();
void selectBar(int index);
private:
struct Bar
{
Bar() : value(0.0), clipped(false) { }
qreal value;
bool clipped;
};
QList<Bar> m_bars;
int m_barSelected;
int m_timerId;
qreal m_lowFreq;
qreal m_highFreq;
FrequencySpectrum m_spectrum;
};
#endif // SPECTROGRAPH_H
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