spectrograph.h

#ifndef SPECTROGRAPH_H
#define SPECTROGRAPH_H
#include "abstractspectrograph.h"

#include <QWidget>
#include <QPainter>
#include <QPen>
#include <QBrush>
#include <QAudioBuffer>
#include <complex>
#include <QVector>
#include <QDebug>
#include <QTimer>
#include <QGradient>

// the maximum number of bands
#define BAND_MAX 128

// width of the bar to be displayed
#define MIN_BARWIDTH 30

// spectrograph class is used to display fourier spectrum
// bars
class Spectrograph : public AbstractSpectrograph{
  Q_OBJECT
public:
  explicit Spectrograph(QWidget *parent = 0);

signals:

public slots:
  void paintEvent(QPaintEvent *e);
  void loadSamples(QVector<double> &_spectrum);
  void timerEvent(QTimerEvent *e);
  void resizeEvent(QResizeEvent *e);
  void loadLevels(double left, double right);
private:
  QVector<int> spectrum, delay;

  int leftLevel, rightLevel;
  int decayIncr;
  int NUM_BANDS;
  QLinearGradient gradient;
  QBrush gradientBrush, backgroundBrush,
  transparentBrush, decayBrush;
  QPen pen;
  float barSpacing, barWidth, widgetHeight;
  double max;
  double time;
};

#endif // SPECTROGRAM_H