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/****************************************************************************
**
** 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:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
** the names of its contributors may be used to endorse or promote
** products derived from this software without specific prior written
** permission.
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef SPECTROGRAPH_H
#define SPECTROGRAPH_H
#include <QWidget>
#include "frequencyspectrum.h"
class QMouseEvent;
/**
* 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
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