/****************************************************************************

**

** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the examples of the Qt Toolkit.

**

** $QT_BEGIN_LICENSE:BSD$

** You may use this file under the terms of the BSD license as follows:

**

**

** $QT_END_LICENSE$

**

#ifndef SPECTROGRAPH_H

#define SPECTROGRAPH_H

#include <QWidget>

#include "frequencyspectrum.h"

/**

 * Widget which displays a spectrograph showing the frequency spectrum

 * of the window of audio samples most recently analysed by the Engine.

 */

class Spectrograph : public QWidget {

    Q_OBJECT

public:

    Spectrograph(QWidget *parent = 0);

    ~Spectrograph();

    void setParams(int numBars, qreal lowFreq, qreal highFreq);

    // QObject

    void timerEvent(QTimerEvent *event);

    // QWidget

    void paintEvent(QPaintEvent *event);

    void mousePressEvent(QMouseEvent *event);

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;

    };

    QVector<Bar>        m_bars;

    int                 m_barSelected;

    int                 m_timerId;

    qreal               m_lowFreq;

    qreal               m_highFreq;

    FrequencySpectrum   m_spectrum;

};

#endif // SPECTROGRAPH_H