FFT.h

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00001 /***************************************************************************
00002     File                 : FFT.h
00003     Project              : QtiPlot
00004     --------------------------------------------------------------------
00005     Copyright            : (C) 2007 by Ion Vasilief
00006     Email (use @ for *)  : ion_vasilief*yahoo.fr
00007     Description          : Numerical FFT 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 FFT_H
00030 #define FFT_H
00031 
00032 #include "Filter.h"
00033 
00034 class FFT : public Filter
00035 {
00036 Q_OBJECT
00037 
00038 public:
00039     FFT(ApplicationWindow *parent, Table *t, const QString& realColName, const QString& imagColName = QString(), int from = 1, int to = -1);
00040     FFT(ApplicationWindow *parent, Graph *g, const QString& curveTitle);
00041     FFT(ApplicationWindow *parent, Graph *g, const QString& curveTitle, double start, double end);
00042 
00043     void setInverseFFT(bool inverse = true){d_inverse = inverse;};
00044     void setSampling(double sampling){d_sampling = sampling;};
00045     void normalizeAmplitudes(bool norm = true){d_normalize = norm;};
00046     void shiftFrequencies(bool shift = true){d_shift_order = shift;};
00047 
00048 private:
00049     void init();
00050     void output();
00051     void output(const QString &text);
00052 
00053     QString fftCurve();
00054     QString fftTable();
00055 
00056     bool setDataFromTable(Table *t, const QString& realColName, const QString& imagColName = QString(), int from = 0, int to = -1);
00057 
00058     double d_sampling;
00060     bool d_inverse;
00062     bool d_normalize;
00064     bool d_shift_order;
00065 
00066     int d_real_col, d_imag_col;
00067 };
00068 
00069 #endif

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