FFTFilter.h

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00001 /***************************************************************************
00002     File                 : FFTFilter.h
00003     Project              : QtiPlot
00004     --------------------------------------------------------------------
00005     Copyright            : (C) 2007 by Ion Vasilief
00006     Email (use @ for *)  : ion_vasilief*yahoo.fr
00007     Description          : Numerical FFT filtering of data sets
00008 
00009  ***************************************************************************/
00010 
00011 /***************************************************************************
00012  *                                                                         *
00013  *  This program is free software; you can redistribute it and/or modify   *
00014  *  it under the terms of the GNU General Public License as published by   *
00015  *  the Free Software Foundation; either version 2 of the License, or      *
00016  *  (at your option) any later version.                                    *
00017  *                                                                         *
00018  *  This program is distributed in the hope that it will be useful,        *
00019  *  but WITHOUT ANY WARRANTY; without even the implied warranty of         *
00020  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          *
00021  *  GNU General Public License for more details.                           *
00022  *                                                                         *
00023  *   You should have received a copy of the GNU General Public License     *
00024  *   along with this program; if not, write to the Free Software           *
00025  *   Foundation, Inc., 51 Franklin Street, Fifth Floor,                    *
00026  *   Boston, MA  02110-1301  USA                                           *
00027  *                                                                         *
00028  ***************************************************************************/
00029 #ifndef FFTFILTER_H
00030 #define FFTFILTER_H
00031 
00032 #include "Filter.h"
00033 
00034 class FFTFilter : public Filter
00035 {
00036 Q_OBJECT
00037 
00038 public:
00039     FFTFilter(ApplicationWindow *parent, Graph *g, const QString& curveTitle, int m = 1);
00040     FFTFilter(ApplicationWindow *parent, Graph *g, const QString& curveTitle, double start, double end, int m = 1);
00041 
00042     enum FilterType{LowPass = 1, HighPass = 2, BandPass = 3, BandBlock = 4};
00043 
00044     void setFilterType(int type);
00045     void setFilterType(FilterType type){setFilterType((int)type);};
00046 
00048     void setCutoff(double f);
00049 
00051     void setBand(double lowFreq, double highFreq);
00052 
00054     void enableOffset(bool offset = true){d_offset = offset;};
00055 
00056 private:
00057     void init(int m);
00058     void calculateOutputData(double *x, double *y);
00059 
00061     FilterType d_filter_type;
00062 
00064     double d_low_freq;
00065 
00067     double d_high_freq;
00068 
00070     bool d_offset;
00071 };
00072 
00073 #endif

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