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/***************************************************************************
FrequencyResponseWidget.h - displays a frequency response
-------------------
begin : Mar 09 2003
copyright : (C) 2003 by Thomas Eschenbacher
email : Thomas Eschenbacher <thomas.eschenbacher@gmx.de>
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#ifndef _FREQUENCY_RESPONSE_WIDGET_H_
#define _FREQUENCY_RESPONSE_WIDGET_H_
#include "config.h"
#include <QObject>
#include <QWidget>
#include <kdemacros.h>
class QPaintEvent;
class TransmissionFunction;
/**
* displays a frequency response
*/
class KDE_EXPORT FrequencyResponseWidget: public QWidget
{
Q_OBJECT
public:
/** Constructor */
FrequencyResponseWidget(QWidget *parent);
/** Destructor */
virtual ~FrequencyResponseWidget();
/**
* Initialize the widget dimensions.
* @param freq highest frequency, will be internally rounded
* up to the next decade if necessary
* @param db_min lowest amplitude in decibel
* @param db_max highest amplitude in decibel
*/
virtual void init(double freq, int db_min, int db_max);
/** Set a new transmission function and update the display */
virtual void setFilter(TransmissionFunction *func);
/** @see QWidget::paintEvent() */
virtual void paintEvent(QPaintEvent *);
private:
/** highest frequency, rounded up to the next decade */
double m_f_max;
/** lowest amplitude in decibel */
int m_db_min;
/** highest amplitude in decibel */
int m_db_max;
/** number of decades, calculated from m_f_max */
int m_decades;
/**
* Pointer to a transmission function object, used for
* painting the frequency response.
*/
TransmissionFunction *m_function;
};
#endif /* _FREQUENCY_RESPONSE_WIDGET_H_ */