frequencyspectrum.h Example File

/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, 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 The Qt Company Ltd 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 FREQUENCYSPECTRUM_H
#define FREQUENCYSPECTRUM_H

#include <QtCore/QVector>

/**
 * Represents a frequency spectrum as a series of elements, each of which
 * consists of a frequency, an amplitude and a phase.
 */
class FrequencySpectrum {
public:
    FrequencySpectrum(int numPoints = 0);

    struct Element {
        Element()
        :   frequency(0.0), amplitude(0.0), phase(0.0), clipped(false)
        { }

        /**
         * Frequency in Hertz
         */
        qreal frequency;

        /**
         * Amplitude in range [0.0, 1.0]
         */
        qreal amplitude;

        /**
         * Phase in range [0.0, 2*PI]
         */
        qreal phase;

        /**
         * Indicates whether value has been clipped during spectrum analysis
         */
        bool clipped;
    };

    typedef QVector<Element>::iterator iterator;
    typedef QVector<Element>::const_iterator const_iterator;

    void reset();

    int count() const;
    Element& operator[](int index);
    const Element& operator[](int index) const;
    iterator begin();
    iterator end();
    const_iterator begin() const;
    const_iterator end() const;

private:
    QVector<Element> m_elements;

};

#endif // FREQUENCYSPECTRUM_H