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 FFTFilter(ApplicationWindow *parent, Table *t, const QString& xCol, const QString& yCol, int start = 0, int end = -1, int m = 1); 00042 00043 enum FilterType{LowPass = 1, HighPass = 2, BandPass = 3, BandBlock = 4}; 00044 00045 void 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