Qt Reference Documentation

frequencyspectrum.h Example File

demos/spectrum/app/frequencyspectrum.h
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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
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