Qt 4.8: frequencyspectrum.h Example File (demos/spectrum/app/frequencyspectrum.h)

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# frequencyspectrum.h Example File

demos/spectrum/app/frequencyspectrum.h

     /****************************************************************************
     **
     ** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
     ** Contact: http://www.qt-project.org/legal
     **
     ** This file is part of the examples of the Qt Toolkit.
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     ** You may use this file under the terms of the BSD license as follows:
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     #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